My buddy just put a rev hard kit with FMU on his LS set @ 8lb. When it hits boost its like the ECU cuts spark. No CEL. Hes tried the missing link and has a vafc, and cant get it to run right. I thought it was the MAP sensor, but theres no cel.

I know i have seen this post before, but couldnt find it.

???

 

take it to a dyno and get it tuned

 

What are his settings with the AFC? please post the injectors and all that good stuff. At minimal if hes rocking 450's he should have 35 across the board.....

450's w/ an AFC you can run like 39 or 40 up to where the turbo starts to spool. so like 3000-35000 rpm and then i would do like 37 and make sure by the time you hit full boost you are at about 35

oh, all these values are in the negative obviously

 

Injectors are stock, the FMU controls a high pressure fuel pump that is supposed to increase 7-8 lb fuel pressure for every lb of boost.

 

he needs a 12:1 fmu 12 lbs of pressure for each lb of boost..umm i think he may be detonating

 

From what i always hear, never run any afc with fmu, missinglink, check valves. Before when i ran the afc without the hack, i used a check valve too. Car ran fine cept it wouldnt let me push it past 4k. Then i ditched the check valve and now the car runs great. trust the hack

 

Ya, i had him double check the settings he has, and it is 12lb.

 

Is your inline/intank hooked up backwards ?