BritishV8 Forum

General Category => MG Sports Cars => Topic started by: v8bloke on February 02, 2010, 04:32:45 PM

Title: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 02, 2010, 04:32:45 PM
Hello All

Just stumbled across this forum and thought id say hello.

I live in Wiltshire, England & Over the last 15 years or so I have been improving my factory V8 for track days.
Weight is down to 970kg and making 293bhp (more to come this year).
Here is a clip of the car at a track day. Rules are, no overtaking on corners and only overtake on the right side.

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/lWa4n7iVCm8&hl=en_GB&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/lWa4n7iVCm8&hl=en_GB&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>


http://www.youtube.com/watch?v=lWa4n7iVCm8

Ill post some pics when I have more time.

Thanks for looking
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on February 02, 2010, 05:22:21 PM
Great clip! Your car has a delightfully viscous undertone, I'm sure it is an absolute joy to drive. Just guessing you could make good use of a bit more grip at the rear. (Couldn't we all?) There's just something magical about 300 horses in an MGB, and your video does about the best job of capturing it of any I've seen.

Jim
Title: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 02, 2010, 05:51:04 PM
 -- moved topic --
Title: Re: 4.6 GT V8 Modified for road & track
Post by: castlesid on February 02, 2010, 09:10:05 PM
Hi Mark,

Welcome to the even darker side. you'll find a few of us Brits lurking in here me, Perry also from the V8 Forum and a few more who possibly didn't realise it's a US site because of the name.

I'd seen the clip before but untiI I put it on full screen hadn't seen how much you were sliding the car around, strangely in the clips that appear at the bottom of the screen there was a certain Mr Blackwood going rather fast round a car park and what a lovely noise that blown 215 made Jim. look forward to when you get that 340 engine fired up..

regards.

Kevin.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 03, 2010, 04:28:12 AM
Thanks guys.

Car does tend to oversteer when driven hard.
I have a 1inch front sway bar and a 5/8 rear sway bar (my own) and have tried various other setups.
If I increase the rear stiffness it oversteers even more. But when I reduce the rear stiffness it understeers less but is no where near as stable at speed over 120mph (read dangerous). I never experience understeer and am very happy with how the front turns in. Car weighs 970kg 52% front 48% rear so weight distribution pretty good. Perhaps this is as good as it gets with live axle.
Although it is slightly tail happy the car is very forgiving and it is quite rare to spin me out (unless its wet).

Finding this site really interesting.

Kevin
We must put faces to names sometime.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: castlesid on February 03, 2010, 07:26:35 AM
Mark,

Yes that would be good, I haven't been out and about with my MG due to health issues last year but hoping to get out there a bit more in 2010

Do you ever do a track day at Brands as that is just down the road from me?

Yes a very good forum with a load of great guys, have you found the engine & transmission section, if not run your cursor up to the web forum and click on web forum hub and scroll down, for some odd reason this not accessable from the drop down menu.

Kevin.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on February 03, 2010, 11:31:55 AM
It should be there Kevin, labeled, "Drivetrain Issues"?

Mark I was referring to your wheelspin exiting the corners, the handling of your car looked spot on, to me at least. But oh my, all that power! (Don't cha just love it?)

Kevin, it's odd but I couldn't find the one you referred to. Do you have a link by chance?

Jim
Title: Re: 4.6 GT V8 Modified for road & track
Post by: mindseye on February 03, 2010, 01:10:31 PM
very nice clip....sounds really good, like a race car should, because of the exhaust I have in mine it sounds more like a muscle car but that is ok too.....I am curious as to what kmph you have topped it out at?....300 hp in an mgb has got to be ridiculously fast
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 03, 2010, 02:02:21 PM
Jim
Problem is wheelspin = tyres dont last long.

John top speed in that clip according to speedo 140mph but sat nav says 132mph
Would be interesting to see what it would top out at with a long enough straight.

Car in bits at the moment.
Fitting new Merlin cylinder heads.
Grafting on Golf (rabbit) Mk1 wheelarches to the front.
Custom re wire.
New complete exhaust system 2.5 inches from 2.25

Thanks
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: MGBV8 on February 03, 2010, 04:04:55 PM
What size tires?
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 03, 2010, 05:21:21 PM
Carl
Front 205/50/15
Rear 235/50/15
Title: Re: 4.6 GT V8 Modified for road & track
Post by: castlesid on February 03, 2010, 05:50:18 PM
Jim,

Strangely I can't find it now but obviously someone has put it on you tube, it was in the links that yiou can bring up at the bottom of the screen, there were a load of BV8's

Kevin.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: rficalora on February 03, 2010, 05:53:28 PM
RE:  Rear 235/50/15

I was able to find 225 & 245/50/15, but not 235/50/15... what brand/model tire are you running?
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Mr. T on February 03, 2010, 07:26:43 PM
Welcome Mark - I've seen your vid a couple of times prior to your post - I can't seem to get enough of mg's with v8's!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 04, 2010, 02:43:28 AM
Rob
Using Toyo R888 235/50/15

Tony
I know what you mean, they seem to be somewhat addictive. In fact 2 of my friends are building copies of my car after some passenger rides got them hooked.
Build cost is in the region of £10k.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: johnny wells on February 04, 2010, 06:12:46 PM
Mark,

Pictures, please.  Lots!

Regards,

Johnny
Title: Re: 4.6 GT V8 Modified for road & track
Post by: MGB-FV8 on February 05, 2010, 12:56:57 AM
Hi Mark and WOW!  I've watched the video three times; it got me a little daisy.  What kind of speed did you get your car to on straight away (MPH)?
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 05, 2010, 03:56:12 AM
Johnny
Pics as requested.

Jacques
Max speed on that particular track is just over 130mph measured on sat nav. Speedo goes off the scale (140mph+)
Silverstone2.jpg
Silverstone1.jpg
Silverstone.jpg
Title: Re: 4.6 GT V8 Modified for road & track
Post by: crashbash on February 05, 2010, 04:45:32 PM
What's been done to the engine to get you hp? If i may ask.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 05, 2010, 05:09:44 PM
4.6 top hat linered crossbolted block, Huffaker inlet manifold/edelbrock 500 (1404). Self ported heads with stage 3 valves & 27.2cc chambers. 4.0L pistons making the compression ratio 11.04:1. Mechanical 238 cam. RV8 style single straight through silencered exhaust. Mallory magnetic dizzy.
Think thats about it.

In the process of fitting Merlin heads which have larger valves so hoping to break the 300 barrier. (currently 293bhp).

Cheers
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: johnny wells on February 07, 2010, 07:50:55 AM
Mark,

Interesting tire set up; 205 - 235.  What wheels (Minilite?) and what width and off-set you runn'n front and rear?

Stock MG axle with 3.07 ratio?  Quaife limited slip?  Stock leaf springs or someth'n different?  Any brake mods?

Thanks for suffering the questions.  Love the grille . . . and the stance at speed.  Too much fun!

Johnny
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 07, 2010, 10:00:29 AM
Johnny
Wheels are made by Compomotive ML  with special offsets. 15x7 fronts(ET5) and 15x8 rear (ET3)

Axle is stock MGB with 3.07 and quaife LSD

Springs are the best handling upgrade ever. Composite from Doug Jackson.

Brakes are Wilwood superlite with 298mm vented discs up front and Ford Cosworth 4x4 calipers with vented wilwood discs at the back.
Also made a Bias pedal box with dash adjuster.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: MGBV8 on February 07, 2010, 10:59:10 AM
"Springs are the best handling upgrade ever. Composite from Doug Jackson. "

Really. I've heard of problems with those delaminating  when used in high horsepower MGs.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 07, 2010, 12:40:25 PM
""Springs are the best handling upgrade ever. Composite from Doug Jackson. "

Really. I've heard of problems with those delaminating when used in high horsepower MGs."

Well Ive been using them since 2001 and have been very impressed.
I think its important to have some form of axle location and anti tramp bars that fit properly without binding as the suspension moves.
In fact I have bought a second set for spare.

I have seen a set shear at the thickest part just in front of the axle and think it was due to Anti tramp bars that didnt follow the same arc as the axle movement.

Has anyone got more information on the delaminating?

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Mr. T on February 08, 2010, 09:54:34 PM
Johnny,

If that's your car in the avatar, you've got an interesting hood scoop - appears to be an rv8/ford hybrid?

Maybe you could start another thread with a few pics.

Thanks, Tony

p.s. apologize for the quick migration off topic.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 09, 2010, 03:51:51 PM
Here is another vid for those interested. Edited from 2009 trackdays.

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Thanks
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: johnny wells on February 10, 2010, 09:29:14 AM
Tony -- I'll hit the hood scoop over on the scoop thread already going.

Mark -- More questions, if I may.

Would like to see pics of the Cosworth rear disc brake set up on the stock MGB axle.  That sounds very interesting.

I assume you're running the wider disc wheel Salisbury axle (rather than the narrower wire wheel axle).  And no mods to the axle shafts, eh?  

Would also like to see your modified pedal box.  I'm thinking of doing the same.

Now, are you running the stock MGBV8 transmission or did you go to an SD-1 or something different?

Thanks!

Johnny
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 10, 2010, 11:30:50 AM
Johnny
Yes am using the steel wheel axle.
My first rear disc conversion used solid Rover 800 rear discs with 2wheel drive sierra cosworth calipers and although they worked well the heat generated under extreme conditions fried the pads and the discs would crack severeley.
Having made the discision to use Vented discs I couldnt find donor discs with the right dimensions so decided to use wilwood ones 11 inches diameter and 0.81 thick. These were bolted to purpose made alluminium bells (which also act as wheel spacers). Then the Cosworth 4x4 calipers were bolted to a custom ally bracket.
The result was that the pads would now last 12 months and the discs are hardly wearing at all.
I will take some pictures at the weekend and post them up.

Gearbox is the R380 2wd. The stock MGB V8 box is VERY fragile and a complete waste of time.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Phillip G on February 11, 2010, 09:03:46 PM
V8Bloke,

What incredible fun and it looks stock, almost like off the show room floor !

It's a race car - no - it's a street car !  Is it right hand drive ? Is their a friend sitting next to you in the passenger seat ?  Looks like it.  That is the bravest guy of all.

very best regards,

Keep them on the track,

Phillip G
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 12, 2010, 12:20:00 PM
Phillip
Yes it is Right hand drive. My friend in the passenger seat is in the process of building his own MGB to the same specification.
The car is road legal.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: kurisu_4u on February 11, 2011, 06:39:21 AM
Hi Mark,

Nice car and impressive performance + the fun of the rear end breaking out ...

I am curious about your suspension setup. Do you have trailing arms with composite leaf springs ? Panhard rod, too ?
I have the Frontline Costello setup and it will require some adjustment. Too much understeer and will sometimes break into oversteer ...

Looking for a proper engine and gearbox, too.

Keep showing the way to modern and more expensive cars !!!

Chris
Title: Re: 4.6 GT V8 Modified for road & track
Post by: crashbash on February 11, 2011, 12:08:14 PM
Wow! Mark
More videos please..........3d next time
Curious what rpm you are reving the motor to on these videos and what you consider red line.  What kind of parts have you got in this engine?  forgive me if that qustion has already been asked

Then how comfortable is it on the street?   I would think it doesn't have to be too comfortable because of the fun factor.  Have you done any long distance club ralleys.  Does law inforcement over there tend to pick on cars like yours on the street or thumbs up and pull you over just to see what's under the hood/bonnet

thank you for shariing
dave bash
Title: Re: 4.6 GT V8 Modified for road & track
Post by: castlesid on February 11, 2011, 06:50:14 PM
For Chris Hardy.  Mark, apologies for hijacking your thread, hope all is well with you and the car.

Frontline front or rear or both?

Sound like you have a rear anti roll bar. I have found the most balanced set up for the road is, Front 480lb springs 7/8th anti roll bar and for the GT rear end the Moss  MGS 40721 reverse spring eye rear leaf springs rated at 110lb ( lowers1 1/2"-2")  with either well rebuilt standard lever arms or well matched telescopics ie not spax.

I have some older Monroe teles that were fitted with a rear anti roll bar, the car was lethal with snap over steer.

 After the front end rebuild with the Moss coil over kit, I fitted the above mentioned springs and removed the anti roll bar but retained the Monroe teles, result, the car is transformed it is now beautifully balanced and the level of grip is amazing, wet or dry, this with the same 195/60 Pirelli tyres on 6" x 15" KN Minilte style wheels.

For a  bonus the ride is also greatly improved as the rear springs are much more compliant but as they are almost flat they do resist lateral movement so for road use a Panhard bar is unnecessary.

Kevin.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: kurisu_4u on February 17, 2011, 02:39:09 PM
Hi Kevin,
Thank you for your input. I suppose you removed the rear antiroll bar.

My car has the Costello Frontline both front and rear, with Bilsteins at the front and Harvey Baileys at the rear. I understand from my dad that Harvey Bailey actually designed this rear suspension setup in the seventies.
I have a ¾" antiroll bar at the front but none at the rear.
A Panhard rod is fitted at the rear and I guess it is necessary on this particular setup with trailing arms and coilovers.
I am not very confident at Spa-Francorchamps as the car was having a noticeable twitch of the rear going into the « Raidillon » (don't want to lose it there) ; but was fine everywhere else, apart from the understeer. May be something's loose and I ought to check it.

I think the heavy understeer comes from a soft rear setup and stiff antiroll bar at the front.
Front springs seem to be the stock items as the front is quite low and seems to have very little travel (bottoms out on the road). A friend of mine has different springs, so I will have a look at this ... or go for 600lbs ones.

Wheels are Minilites 8" x 15" with Yokohamas 225/50 and 245/50

Engine is the P6 « flexible » type (10.5:1 compression ratio) with RPI 285 camshaft and Weber 500 carb on an Edelbrock Performer manifold. Exhaust is the tubular bloc hugger type, so not very good for horsepower. The engine really revs easily to 6500 and I once hit 7500 by error. Bought a rev limiter to avoid going over 6000 since (not good for the main bearings).

Didn't really take time to drive the car these last 3 years as I rather chose to ride bikes. Missing it now, and will sort it soon.

It's meant to be a trackday toy, so comfort is not the aim.

Cheers
Chris
Title: Re: 4.6 GT V8 Modified for road & track
Post by: castlesid on February 20, 2011, 08:45:34 AM
Chris,

Just checked the Fronline site and there appears to be no camber adjustment for the front end kit so what you need for track use is a set of negative camber lower wisbones, these will give approx 1 1/2 deg. of negative camber and reduce the understeer considerably, again for track use the 600lb springs are the usual way to go, the 3/4" anti roll bar is probably not stiff enough! a 7/8th or 1" is the norm for track use.

Also for track use if the front end is properly sorted a small but preferably adjustable rear anti roll bar can be beneficial

With a "B"  to have the front stiff and the rear soft is the best set up, what sort of ride height do you have. is your car based on a chrome or rubber bumper model? if rubber then to correct the increased ride height of the crossmember (1 1/2") you can get dropped spindles from the states from Fab Tech, lots of good suspension advice ther too.

You can get the neg. camber arms from Doug smith at MG Motorsport, he knows Spa like the back of his hand and certainly knows how to make a MGB stick to the road and is very happy to have a chat, you can trust what he tells you.

Kevin
Title: Re: 4.6 GT V8 Modified for road & track
Post by: pspeaks on February 20, 2011, 11:10:20 PM
Johnny,  I love the look of your car!  Did you make or buy the hood scoop?


"P"
Title: Re: 4.6 GT V8 Modified for road & track
Post by: kurisu_4u on February 23, 2011, 07:32:09 PM
Hi Kevin,

I forgot to add that the car has Frontline castor angle wedges, reducing the castor angle by around 3° if I'm correct.
Doug Smith is a nice guy.  I had the chance to meet him at Spa a number of years ago during historic races.
Will take the time to talk to him.

My car's the rubber bumper type but I have no idea yet what the springs nor the ride height are. Where do you measure the height ? Front fenders are modified, so it's difficult to compare with a stock car. Distance from the center of the hub to the top of the wing is 51cm (20") at the front and 56cm (22") at the rear from the center of the hub to the bottom of the side window. I think it is rather close to the rubber bumper height.

And you are right about the anti-roll bar. 3/4" seems too soft as the car leans quite a bit as can be seen on photos.

Tank you for your advices
Chris
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on March 01, 2011, 05:40:12 PM
Sorry guys Ihavent visited the forum for ages.
Merlin heads are now fitted along with new exhaust system.
Here is a clip from Silverstone F1 circuit mixing it with 500bhp+ cars

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Same session taken from the Evo with the graphics.

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Car is going very well with 326bhp now.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on March 03, 2011, 04:02:31 AM
To answer a few questions
Dave Bash
I have a Digital race electronics rev limiter which has a maximum RPM recall feature and according to that it tops out at 6400rpm although max bhp it mate at 5800rpm. The car has evolved over the last 10 years which is when I first started doing track days. I wanted to keep her road legal so I could drive to my local track about 30mins away. I have adjustable shocks all round with fairly stiff front and fairly soft rear springs. If I drive on the road with track settings it is fun but very bumpy and the car tends to hop about over rough road surfaces. with the shocks softened off a few clicks its not too bad. The seats are moulded fibreglass with no padding at all and they are actually very comfortable even on a 100mile trip and weigh 4.5kg each. With a race/rally solid lifter cam it doesnt like cruising below 2000rpm and above 3000rpm the performance is violent.
I drive about 5000 miles a year and have only been stopped once for speeding which is fair enough. I generally stick to speed limits though.
Handling is generally very good with no understeer at all, the front end is like on rails but the rear tends to break away too easily.
I have tried removing my custom rear ARB which improved the oversteer but I felt the car was much more unstable generally, so bar is back on. Latest mod is that I have lowered the panhard rod by 2 inches ( was along centreline & paralell to the axle) to lower the rear roll centre but have yet to test it.

Cheers

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on March 03, 2011, 12:05:54 PM
Need fatter back tires.  :-) :-) :-)
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on March 07, 2011, 03:47:05 PM
Jim
If only!

265 or even 285 would do the trick.
Would love to try some slicks but again sizes are restricted with 15" wheels.
Next trackday is 21st March on the F1 circuit at Silverstone, so should see if the lowered panhard bar is an improvement.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on March 28, 2011, 03:37:04 PM
Definateley an improvement with the lowered panhard Bar.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on March 29, 2011, 06:39:05 PM
Just uploaded some footage. Took a bloke for some passenger laps, his comments are quite funny.
<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/muIYiftiflg" frameborder="0" allowfullscreen></iframe>
Title: Re: 4.6 GT V8 Modified for road & track
Post by: J Man on April 02, 2011, 07:03:22 PM
Any chance you could do a write up for the Photo Gallery section, I did not see one there.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on April 05, 2011, 03:22:50 PM
J Man

OK Ill take a few more photos and have a go!

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Preform Resources on April 06, 2011, 06:29:37 PM
Mark, been watching your  videos,,,,,,,,,,,,,,,,,THEY ARE GREAT!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on November 16, 2011, 12:06:00 PM
After destroying 2 big end bearings the engine is now 4.8 with a new standard 4.6 crankshaft and 96mm forged pistons.
Did my first trackday for six months last Saturday and found this on youtube.

http://www.youtube.com/watch?v=HQkCMkgsqK0&feature=feedu
Title: Re: 4.6 GT V8 Modified for road & track
Post by: RobertE on November 17, 2011, 09:39:18 PM
Wow! I've seen your videos before but I'm thoroughly impressed with the new handling characteristics - on this side of the pond they have an event called 'driftwater' where for a small price you can practice drift/grip skills. Your car looks like it would fair well in both. I'm wondering though what are the characteristics of the shocks you're running? I have a 4.9L setup and I'm considering rebuilding the shocks however I'm not sure if I should swap in the 20% stiffer valves or rebuild them to stock specifications(I have a rubber bumper model mind you).

Any advice? Keep up the good work
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Moderator on November 17, 2011, 10:14:19 PM
Way cool video!  


We need to get your car written up in the photo gallery.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on November 18, 2011, 12:50:01 PM
Robert
Yes the handling is much improved with the new panhard location,
Curtis
Yes I need to sort this out, must take some more photos.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on December 15, 2011, 05:49:26 AM
Here is a pic from last week at Brands Hatch.
(http://i76.photobucket.com/albums/j30/V8bloke/XSP_9042.jpg)

and here is a clip from the day.
http://www.youtube.com/watch?v=8XtZAxMKZZU

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on June 17, 2012, 04:05:14 AM
Havent been on here for a while. Late last year I had a lot of issues with the car mainly with oil surge/pressure problems.
After the Big end failure in June last year i fitted the later intermediate timing cover with the crank driven oil pump and a Davies craig EWP. Straight away i was having problems with low oil pressure under medium to hard cornering. Was using the same sump/pickup so couldn't work out why. I tried fitting a big wing trap doored sump which improved things slightly but still not good.
Would like to have fitted a dry sump but space was too tight so as a compromise fitted an Accusump which seems to have solved the problem. Now have 2 Gopro cameras so video quality is improved.
Here is my latest adventure with the car spinning out near the end.

Cheers

Mark

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Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 22, 2012, 06:15:32 AM
Here are the latest upgrades, a rear Wing and front splitter. Yet to be tested on track.


<iframe width="560" height="315" src="http://www.youtube.com/embed/VREATjDytXw" frameborder="0" allowfullscreen></iframe>
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on April 12, 2013, 06:07:39 PM
Rear wing and front splitter getting their first test on Track @ silverstone.
http://www.youtube.com/watch?v=HnDjFI_m5i8

A huge improvement to high speed stability and cornering.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Moderator on April 12, 2013, 10:25:23 PM
Awesome video!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 12, 2013, 04:18:20 PM
Update.
Modifications are underway to fit these,
(http://i76.photobucket.com/albums/j30/V8bloke/mark042_zps903535e8.jpg) (http://s76.photobucket.com/user/V8bloke/media/mark042_zps903535e8.jpg.html)
Jenvey 45mm throttlebodies together with a Canems ECU
Hoping for superior power delivery and throttle response.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 22, 2013, 07:42:53 AM
Nearly ready to fire up and start mapping.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_0354_zpse3966642.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_0354_zpse3966642.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_0353_zps85856d4e.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_0353_zps85856d4e.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_0352_zps09bc373f.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_0352_zps09bc373f.jpg.html)

Cant wait to get it up and running.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Moderator on August 22, 2013, 12:53:00 PM
That's looking fantastic!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 31, 2013, 01:36:19 PM
The guys doing the conversion, http://www.lloydspecialistdevelopments.co.uk/ have managed to get it running and done some mapping on the road. Next step is a Rolling road session on Tuesday 3rd Sept so hopefully should get a power run and will post the dyno sheet.
Not expecting big gains in top end but throttle response and pickup should be improved.
Spec is 96mm bore, std 4.6 crank, forged pistons, Merlin F85 heads, Roller rockers, Mechanical 238 cam. 10.5:1 CR
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on October 03, 2013, 03:54:28 PM
Had to fit an uprated clutch as it started slipping on the rolling road. Re visited the RR today for final mapping and power runs.
Very happy with the results.
(http://i76.photobucket.com/albums/j30/V8bloke/dynosheet_zps3bf8e40e.jpg) (http://s76.photobucket.com/user/V8bloke/media/dynosheet_zps3bf8e40e.jpg.html)

This is the latest vid with the new setup.
http://www.youtube.com/watch?v=si8n3Ke_ldY&feature=c4-overview&list=UUX21gkuaDzTHCDE5vkwIEuQ

Cheers

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: DiDueColpi on October 04, 2013, 03:19:23 AM
Hey Mark,
I don't care if you made 2 hp and 5 ftlbs of torque.
The car looks meaner than hell and must be a thrill to drive.
Well done.
Cheers
Fred
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on December 19, 2014, 03:41:25 PM
Hello all, Haven't posted for a while.
Been very busy with upgrades. Mainly the rear suspension conversion to 4 trailing links with coilover shocks and a mumford linkage which seems to work very well indeed.
Just finishing an engine swap to a 5.0L rover short stroke with TA cylinder heads, 248 mechanical cam and throttle bodies.
The car is fighting against me though, as everything seems to have a knock on effect resulting in un expected work.
I should be starting the engine for the first time soon and once mapped will see if it has all been worth it.
There doesn't seem to be a lot of info about these heads. Has anyone published bhp figures? cant seem to find any reviews.
thanks
mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: mgb260 on December 19, 2014, 04:13:26 PM
Mark, What did you do to upgrade the rear axles, posi?
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on December 20, 2014, 05:03:52 AM
Jim,
I am using the MGB axle with quaife LSD. Also have had some special half shafts made which I am assured will cope with the abuse.
I re designed the area above the axle as you can see in this pic.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_0460_zpsddb8bb48.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_0460_zpsddb8bb48.jpg.html)
Its difficult to get a decent photo but this one gives an idea of what I did.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_0556_zpsee57b1e2.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_0556_zpsee57b1e2.jpg.html)
Also I had to re design the fuel tank. It now sits upright behind the mumford link.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_05941_zps010d10de.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_05941_zps010d10de.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_06001_zps94f20395.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_06001_zps94f20395.jpg.html)
It was a lot of head scratching!
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: mgb260 on December 20, 2014, 11:30:14 AM
Wow!, Mark you have been busy! Keep us posted.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on December 20, 2014, 01:30:22 PM
Not a lot of info yet on the TA heads. Art has a set but hasn't run them yet, looks like you get to be the pioneer, so we are very interested in your impressions and results. Nice work.

Jim
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on December 23, 2014, 08:17:19 AM
Thanks,
Latest problem is that my alternator doesn't clear the new heads as casting is different than the previous merlins (was very close anyway). Getting very close to starting the engine for the first time. Should have some rolling road info early in January.

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on January 18, 2015, 03:13:21 PM
Update
New alternator fitted and engine running. Needs re mapping now.
some pics.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_07771_zps858b8dd3.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_07771_zps858b8dd3.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_07781_zps6d7216b2.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_07781_zps6d7216b2.jpg.html)
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on January 18, 2015, 08:47:22 PM
Looking good Mark! Interesting valve covers, I hadn't seen those before. Did you consider the TA ones, or just have those on hand?

Jim
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 04, 2015, 04:00:46 PM
Jim, I had the covers made by these people http://jrcast.com/  you can choose up to 10 letters. Thought I would be a bit different.
didn't know TA made any!

Cheers
mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: Moderator on February 04, 2015, 05:59:36 PM
re: "I had the covers made..."

They're so very cool!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: MGBV8 on February 04, 2015, 06:04:57 PM
QuoteI had the covers made by these people [jrcast.com] you can choose up to 10 letters.

Hmm.......R-O-A-D-M-A-S-T-E-R......yep, that's ten.  Way cool!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 07, 2015, 05:58:14 AM
Rolling road 429bhp at fly 380 at wheels over 390lb ft torque. she is gonna fly!!!!!!!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on February 07, 2015, 10:40:02 AM
That's quite impressive Mark.
Do you mind revealing how much the rocker covers set you back?

Jim
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 07, 2015, 01:23:49 PM
Jim, covers were about £200 inc shipping from Ireland.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BlownMGB-V8 on February 07, 2015, 02:56:43 PM
Probably not out of line for a custom part. Might be out of reach for the Roadmaster though.

Jim
Title: Re: 4.6 GT V8 Modified for road & track
Post by: 302GT on February 11, 2015, 08:18:47 AM
Regarding the TA heads, on the v8 Owners Forum a 5 liter Rover (NA) with TA heads was reported to put out 429 hp (engine dyno).
Title: Re: 4.6 GT V8 Modified for road & track
Post by: 302GT on February 11, 2015, 08:35:45 AM
Clarification:
The 429 hp figure was extrapolated to the flywheel from a measurement at the wheels. Dyno graphs are not posted yet, will be in a few days.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: mgb260 on February 11, 2015, 08:17:12 PM
Larry, I believe it is Mark's engine in this thread
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 15, 2015, 05:04:17 AM
Yes 429bhp at flywheel, 380bhp at wheels, 390ft lb torque.
Car is still at the rolling road as they have found a slight problem. intermittently one cylinder down ( number 6). They have diagnosed the injector as being at fault. Should have a replacement in a few days.
When I eventually collect the car I will upload the dyno sheet.
Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 05, 2016, 06:52:36 AM
Well I haven't posted for a while.
 I have been having a miserable time with the new engine. To cut a long story short The mapper messed up big time running the engine very rich which resulted in smoke puffing out the exhaust after only a few hundred miles.
Had to have the cylinders honed with new rings mains and big ends.
On top of this the Engine will just not run properly. I have replaced everything and come to the conclusion that it must be the Canems ECU.
While the engine was being refreshed I had the car blown over and tidied up.
(http://i76.photobucket.com/albums/j30/V8bloke/IMG_1173_zpsfdszvtdi.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_1173_zpsfdszvtdi.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_1169_zpsrakhgpdu.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_1169_zpsrakhgpdu.jpg.html)

(http://i76.photobucket.com/albums/j30/V8bloke/IMG_1171_zpsp5c7m9wq.jpg) (http://s76.photobucket.com/user/V8bloke/media/IMG_1171_zpsp5c7m9wq.jpg.html)

The car has been sent away to have a new Link G4 Extreme ecu fitted together with new loom. the tuning shop said it would take 2 to 3 weeks but has now been 10 weeks and still not done.
I'm feeling somewhat frustrated but hopefully I should see the car again soon and it should actually work.
Watch this space.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: mgb260 on August 05, 2016, 12:26:50 PM
Mark, WOW!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on August 05, 2016, 04:34:43 PM
Here is the clip of the smoking problem from late last year.

https://www.youtube.com/watch?v=W341hsWs__Y

You can hear that the engine isn't running right.
Title: Re: 4.6 GT V8 Modified for road & track
Post by: BAD-DOG on August 07, 2016, 02:04:57 PM
What a beautiful piece of equipment !!!  I absolutely love that intake!

Can't wait for some more track video complete with more of those four wheel drifts like you were making in the first video !!!
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on February 20, 2018, 05:19:35 PM
Hi all, I haven't been on here for a while. For those that are interested, after a long long time of having running problems the mg is now sorted. 380bhp with 400 lb ft torque.
Here is the latest walk round showing new front valance/splitter and refreshed paint.
https://www.youtube.com/watch?v=GeO4a2WMJ6U

Looking forward to getting back on track this year.

Cheers

Mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: MGBV8 on February 22, 2018, 11:47:28 AM
I'm sure you are!  We are looking forward to more track video.  :)
Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on September 12, 2019, 09:24:19 AM
Latest clip from local trackday. Car going really well.
The smoking problem turned out to be small hole in inlet runner through to pushrod hole.

https://www.youtube.com/watch?v=oApIXsibs6M

Another one from last November at Silverstone grand prix circuit. Track was very slippery.

https://www.youtube.com/watch?v=8p02E4TlHfU


Cheers

mark
Title: Re: 4.6 GT V8 Modified for road & track
Post by: benjaminbcooke on October 18, 2019, 07:28:31 AM
First Ever trip in France Road: You need to follow these rules

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Title: Re: 4.6 GT V8 Modified for road & track
Post by: v8bloke on October 21, 2019, 12:58:47 PM
Thank you Benjamin, just to confirm..... I am not driving in France.