fast[R]

Ok guys eny ideas, just got my botom end done with JE 9;1C/R and eagle rods. I'm runing RC 310's and 12;1 FMU. We tryed boosting more than 5psi and it runs very lean,the fuel preshure at idle is around 50 and at high rpm is around 100. Could the FMU not bee working properly?

C-speed

Do you have the FMU connected properly?

redline

what fuel pump do you have?

fast[R]

I have a walbro fuel pump on the FMU everithing looks good and it is a Vortech. The shope has another one in stock will try it tomorow and see what hapends, things are pointing towards the FMU will see.

AlphaKennyWun

Warlboro craps out at 75 psi of fuel pressure. Its a fact. A 12:1 FMU + 5 psi boost = 70 psi fuel pressure. Thats why youre leaning out.

Although I dont know why you have 100 psi. Maybe boost gauge is off or waste gate is creaping boost higher? Anyhow the pump cant handle 100 psi of fuel, you need to get either 8:1 disc or an inline pump minimum. Although I recommend a hondata or similar piggyback or standalone.

Mr. Vapor

i run the 8:1 on my 310's.......

DRAGLS

what are u using to monitor the air/fuel ratio?

schwett

the gss-342 does not crap out at 75, it craps out (with ±300cc injectors) around 110psi. not that i'm reccomending this, but depending on which pump he has that may not be the problem.

also, isn't the 12*5 added to his static fuel pressure, which must be in the 30s or 40s, right? i actually wouldn't be surprised if it was 50+, b/c that pump tends to jack the pressure way up unless you drill out the stock FPR. so he could be seeing well over 100psi, in which case, yeah, the pump may be crapping out.

got an in-cockpit fuel gauge?!?!?

fast[R]

yes I have one of thoes in the cockpit The gauge is reading100 psi that is for shure unlese the gauge is fu*ked. I'm going to get the 8;1 disc and see, how much does it cost? And how dificult is it to replace