Ok so heres the deal.. I have a turbo maxima specs will be listed below... So any who when I am driving i get a sputter around 3800-4000 rpms and it continues as long as i am WOT...As it is sputtering my AFR is good around 12.7. Now if i am under partial throttle it will go all the way to red line until i shift.. WHATS THE DARN DEAL????? I thought maybe my A32 MAF was maxing out so i installed a Z32 MAF and the problem still persists. Its almost like the car is cutting back fuel or more like its running only 5 cylinders.. The car drives normal daily driven and the AFR looks good just under WOT i get this problem... The weird thing is even though its sputtering its gaining/holding boost and still has some power and AFR looks bueno!!!!!

Summary of fuel/air mods: 255 walbro fp, 370cc injectors, Z32 MAF and a Aem wideband... Anyone that can please help me resolve this problem or has had similar problems please help!!!!!!

 

What's your fuel pressure set to? Also is your BOV leaking? What's the PSI reading?

 

Its running on the wastegate spring which is 7 psi.... and i have no idea what the FP is because i have no FPR.... Should i get a FPR and if so what should the stock FPR be at when and if i get one???? I do have a FMU but i have no idea what the calibration is on it so i took it off cause it was running to rich on the stock injectors....

 

Spark blow out maybe? Check the gap on your plugs.

 

12.7 AFR? yikes... that's like normally aspirated range there.

 

What should my AFR be at then? is that too rich?

I am going to check the spark plugs and test the ignition coils...

 

11.0 -11.5 what I am for. Also how much timing you running.

 

I have no idea on the timing.... I am using a VAFC2 for minor adjustments but i plan on getting a emange blue.

Just took it for another test drive and if i have it at partial throttle it has no sputter and runs like a beast but as soon as i go WOT sputter instantly...

 

If your at WOT and seeing 12.7 thats lean, rich would be in the 10's
Sounds like spark plug blow out to me

 

Ok now at WOT its around 10.0 or 10.8..i had a pinched fuel line so that worked out for taking the lean away... What is spark blow out and how do i know if thats whats going on?? I have BKR7's so what should the gab be set at??

By the way sorry to hear about your car bro .. Your car was one of my inspiration cars!!!

 

Ok i did research and know what spark blow out it... That might be my problem cause i do have 2 step colder plugs but i am running a .043 gap... I am going to reduce the gap to about .035 to see if that helps out with the problem