Fuel Pressure for 24lb Injectors.

[Sgt.5point0]

I was just wondering what those of you using 24lb injectors have your fuel pressure set at (vacuum off/plugged).

 

[Bobert]

I've seen very similar motors like different fp's. I started at 45 and worked down. Think I ended up around 40, but another friend's car ran best around 35. We just went by trak times (mostly mph) to set them.

 

[gt90stang]

Sgt.5point0,

On mine datalogging with Tweecer RT, 37 psi was ideal with 24# injectors and 306 cu in. NA.

YMMV, Don

 

[Sgt.5point0]

Ok, I just installed a SCT Chip and the instructions said to set the f/p at 39 vac off to start. It was set way higher from the intial tune I had done last summer, 49 vac off. It seems to run a lot better now on the lower pressure. Will playing with the f/p give you decent gains or is it just driveability?

 

[gt90stang]

At WOT the PCM uses fuel corrections learned at part throttle to compensate. If the fuel pressure is too high or low the correction may not be right at WOT, only a WB02 can determine that. In closed loop the PCM can adjust +/-15% or so to make up for minor inaccuracies. The PCM also assumes that the MAF transfer is accurate, if it isn't then all bets are off. So how your setup reacts to fuel pressure is dependent on many variables. Not knowing your combo, if it runs good with no detonation then your probably ok, to be sure a WB02 is the only way to know.

Good Luck, Don

 

[Sgt.5point0]

Eww, isn't getting a wide band O2 done kind of expensive? Also my mods are in my garage.

 

[gt90stang]

Ok, after checking your garage...your setup is pretty close to my original setup and 37# FP was ideal for that before tuning with Tweecer RT. After Tweecer RT 39# was ideal so you should be ok.

Don