Modded R32 Gtr--fuel Cut, Won't Hit Redline With Stock Boost

[Phantom_RB26]

Hi all,

Wanted to get some suggestions on troubleshooting fuel cut problem.

R32 GTR

Mods:

-Blitz Access ECU

-T517Z 8cm turbos

-full exhaust, no cats, HKS Hi-Power

-Greddy/Trust Dumps

-Blitz Intake Pods

-ARC Blow Off Valve

-Larger FMIC w/ Piping

-Stock Fuel

-Stock Boost Restrictor still intact. 10lbs. of boost.

-Stock boost controller

Symptoms:

When going full tilt, turbos will spool, and boost will build. Will rev to 4k then bounce as if it's hitting the rev limiter around 4500-5k rpm. I can hear the BOV "sneeze" multiple times. 1st gear can hit close to redline then bounce the tach needle, 2-3-4-5 gears going full throttle will display the aforementioned symptoms, build boost then bounce the needle at 4.5-5k rpms.

Other than that the car drives flawlessly around town.

Any suggestions as to why this can be? Fuel upgrade? Bad coils,CAS at higher RPM? All of the above...

[KiwiRS4T]

Two points:

I believe the Blitz Access ECU is not tunable so about as much use as a Mines ECU or a paper weight.

You say "stock boost" but if you have bigger than stock turbos you will be moving a lot more air at the same boost figure.

The answer is get a proper ecu and a tune.

[Phantom_RB26]

Thanks for the reply KiwiRS4T,

The points you've made makes sense. I guess I'll look into upping the fuel system then, if I'm gonna need a standalone and a tune, I might as well take the restrictor out and tune it for a couple more lbs. of boost.

[Ben C34]

The obvious thing to do is stop guessing and get on a Dyno. At the very least get a wideband.

Before you know it you might kill your engine the way you are going.

And I vote get rid of that ecu.

Did the car ever run nicely?

[Hadouken]

what is up with people not tuning their cars lately?

[STATUS]

insert chipped ecu (with rev limit and speed cut removed no other features) all problems will disappear... i wish.... i could do 30 cars a day instead of 3.

Not sure how all these ecus still surface after so many years... i thought id binned enough for everyone.

[s2d4]

what is up with people not tuning their cars lately?

Maybe they are Americans? I see that a lot in their euro and most recently the 86/brz scene. Edited September 19, 2015 by s2d4

[Phantom_RB26]

The obvious thing to do is stop guessing and get on a Dyno. At the very least get a wideband.

Before you know it you might kill your engine the way you are going.

And I vote get rid of that ecu.

Did the car ever run nicely?

The car runs just fine, until you full throttle it. I'll strap it to a dyno after I find an Ecu for it, and see what happens, I knew I'd have to get a standalone sooner or later. FWIW the stock twins were smoking a couple months ago, was going to rebuild them but found freshly rebuilt T517Z's from this forum. It was worth buying at the time, if I bought from the states it would've been much more expensive. I wasn't expecting to do a major turbo upgrade like the T517Z's, but I'll go ahead and get the upgrades to back them up and keep the motor healthy. I appreciate the help.