Fuel injectors

[rficalora]

As I'm getting ready to install the ProFlo system I picked up, I'm wondering if I should have the injectors cleaned 1st.  Given it was installed & possibly run on the PO's engine and then removed & sat for several years, I'm thinking there may be varnish built up.  Thoughts - good plan or waste of money?

[DiDueColpi]

Get them cleaned and tested for sure Rob.
Nothing worse than spending hours on a tune only to find out that you're setting up on bad injectors.

Live like you mean it.
Fred.

[BlownMGB-V8]

Definitely cleaned and tested by a competent shop. Have them give you a flow graph based on injector on-time with a minimum of four-five data points and an extension to give the injector dead-time, and full saturation flow rate. These are the absolute minimums you should have but you should also get flow spread at each data point so you know for instance, what the % variance among the full set is at your idle flow rate.

Ideally you would have no variance. But this is the real world and it often doesn't work out that way.

Jim

[rficalora]

Any particular company to use...  or avoid?

[MG four six eight]

Rob,

I've had good luck using Witch Hunter Performance http://www.witchhunter.com/ in the past.

Bill

[rficalora]

Looks like getting them cleaned was well worth the money...  4 of 8 injectors weren't firing at all (probably due to dried fuel from prior owner's use).  All good now...

[BlownMGB-V8]

I only see full flow test results. You really do need the injector dead time to be able to enter that in the controller settings, and the only way I know to get that is to do chart a series of 4 or 5 flow tests at different pulse rates. Just because they flow the same fully saturated does not mean they flow the same at 4 ms. (idle)

Jim

[MGBV8]

Injector R Us?  Facalora?