I have finished my current build on my 05 Evo 8, and in the process of tuning, we can't get the car above 4000RPM. When it gets there, it shoots to 21AFR, and tries to die. I'm running a Walbro 450LPH E85 pump, -8AN lines to the rail, Fore Fuel Filter, FIC rail, FIC 2150cc injectors, FuelLab AFPR, and stock return line. My injectors are seeing 10.5v with the car off, but the key on, when I ground the multimeter on the plug ground, but 12.5v when I use the battery ground. I can't figure out what's going on and it''s frustrating the **** out of me. Help, please?

 

Interesting, especially the difference in voltage between the two grounds. I would investors hate that portion first and see if that may be or a part of the issue

 

Did you bypass the injector resistor pack?

 

Yes, I have a resistor pack delete plug.

 

How's Idle AFR's? Running a MAF?

Mine did that when I started getting on it was intermittent and turned out to be a faulty MAF

Replaced it and all good

 

At idle, the AFR is fine. I'm running Speed Density.

 

Is it in Valet mode?

 

No.

 

you sure its not just needed to scale the injectors correctly?
tune?

 

100% sure they are scaled correctly.

 

Bump because I want my car back...

 

if it were me.....
i would buy a in car fuel pressure gauge that reads at the rail.

do a pull, watch the fuel pressure. If the pressure is low, then fuel issue.
If the pressure is normal, then tune issue.

 

I'm watching the fuel pressure while having someone else rev the engine while in my garage. It doesn't do anything abnormal. It did this same exact thing at the same exact place with a standalone, as well as with the stock ECU.

 

That won't do anything... you're not in load and you're not building the same amount of boost. Boost changes fuel pressure

 

This entire post is based off what the car is doing in neutral in my garage..