well, i just did the host job, and on my secondary i get fuel cut around 5300rpms

@#^% it, so i went with the non sequential conversion (the don't be a rikki one)

i still get fuel cut around 5300rpms...so it's a persistant problem

anyone care to help me diagnose the issue?

 

Are you sure it's fuel cut?

What's your boost at when this happens and what ECU are you currently using?

 

Yeah are you sure it's fuel cut, what does it feel like? Is it a sharp cut off of power or does it kinda sputter around that rpm range? What are your mods and what boost are you running?

 

well, it's sputtering around that rpm range

i guess fuel cut is like being in limp mode, so it wouldn't be that

things i suspect:

*10mm magnecores on stock ignition/ecu
*not replacing the ACV valve with a metal gasket (would like to avoid this possiblity at all costs)
* dirty fuel injector/weak pump
* secondary injectors not engaging for some reason
* airpump oneway valve to cat not installed....

any other ideas?

greddy catback, stock ecu, high flow cat, panty hose intake , rikki non sequential, vaccum hose job, new NGK's, new magnecore 10mm

 

would getting a PFC help me figure out if the injectors were working properly or if the ignition system was working properly?

can i diagnose this problem with that?

 

boost is at 7-8psi when it does it, then it drops to 5psi to redline

 

hmmm idk if your experiencing fuel cut, its sounding like your boost is cutting out on you, perhaps you have a boost leak or soemthing. your boost should be higher.

 

anyone happen to know the part # for the metal gasket on the ACV? well, the ACV and every other part that the block off plate set will disable

 

Are you getting full boost on the primary turbo? Does you get a sharp hesitation when this happens? Like the car stops accelerating and almost feels like hitting the brakes inadvertently? If so, then what you're probably experiencing is the overboost fuel cut that is programmed with the stock ECU. kwikrx7 had a post a while back with the exact boost limit matched to rpm. It is somewhat rpm-dependent, but generically speaking, if you're running over 11psi on the stock ECU, it will fuel cut in the higher rpms. You could either do the home depot boost control valves or upgrade your ECU to alleviate the problem. Your call ...

I had this problem too when I dropped in my RS/RZ turbos. I ended up upgrading my ECU. Good luck.

 

my boost gauge isn't going above 10 though...so i don't see how that could be the problem, i'm tapped into the line with home depot valves already, iv'e got the wastegate all the way open, so i shouldn't go above 7psi, but it's going to 7-8psi

 

even though you got the wastegate all the way open, it can still go past 7psi, 7psi is just a general area of to how much it should be at.

 

My friend had the exact same problem, it was his plugs he didn't change them. Are your new plugs the correct heat range? It's probably eaither that or your wires/fuel filter. I forgot wether magnacore was good or not, there was a post back then that has some crappy wires on and it did something liek his too and everyone joined in and said they had had problems liek that with the plug wires.

 

well, when my car is in warm up mode and restricts me to 5psi, the car runs great....can go all the way to redline, no probs

so i don't suspect ignition anymore

i'm guessing a boost leak somewhere, i'm ordering a PFC and i'm ripping the car apart to install the block off plates

 

I actually have this same problem in my T2 at the moment. In 4th and 5th gear around 5k my car kinda stumbles. Im installing a aftermarket boost guage at the moment, but the sotck gauge shows no reading in boost drop or anything. Its only in 4th or 5th gear. But thats weird is I can overshift it. I redline 3rd that will put me just above 5k in 4th and it wont stumble, same with 5th gear. I just ordered a FCD to find see if it will help with the problem.---Steve

 

i found some check valves that are in the wrong place, well one really...for some reason there's one going from my rats nest to my double throttle actuator...hmmm....
ripping the UIM off in a few when the car cools, i'm checking and verifying all connections

 

was a boost leak, purge solenoid broke AGAIN and had a bad check valve, so i just plugged the line

i'll be going back to sequential within the next week