Taking long trip to Tenn, need fuel pressure advice.

[IndyBlk5.0]

Its going to be a good 5 hour trip with around 30 degree temperatures. I know that temperature plays a big part in a/f ratios. Here is the problem, I know I am running lean at idle and cruise.

I don't want any prolonged damage. Im pretty sure I am running at 34lbs vacume on and around 38lbs vac off for the AFPR... I am also running 24lb injectors. 75mm pro m bullit... Suggestions?

 

[Rick 91GT]

If you adjust FP through the regulator you are only going to get the added fuel at WOT, when the O2's drop out.

If the car is lean at idle and midrange then it needs a larger injector, a larger fuel pump or maybe the meter recalibrated. The EEC will adapt and make the pulse width correct on the injectors to make the A/F correct.

It is well known that due to the fuel curve Pro-M has for a 24# and a Pro-M bullet they are lean at idle in many cases. It would not be present with a 30# inj or if you had a different meter, say an 80mm. Do a search and you may find some of the old threads on here and the Corral about the issue.

From what I remember the curves for a 19, 30, 36 are all the same, but for some reason it could not be acheived with a 24. I had that same issues and it went away when I swapped to a 76mm C&L.

I would make sure the car is set to 38PSI vac off and hit the road...

 

[IndyBlk5.0]

Great info as ussual Rick. I have a pro m optimizer, but I have no clue how to use it and I want to get it on a mustang dyno to properly tune it. But I don't have time.