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

Phantom_RB26

By Phantom_RB26,
in Engines & Forced Induction

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Phantom_RB26 Rookie

Phantom_RB26

Posted
Posted

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 Grand Master

KiwiRS4T

Posted
Posted

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 Rookie

Phantom_RB26

Posted
  • Author
Posted

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 Grand Master

Ben C34

Posted
Posted

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?

STATUS Grand Master

STATUS

Posted
Posted

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.

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Phantom_RB26 Rookie

Phantom_RB26

Posted
  • Author
Posted

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.

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