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Need Help After Installing Gcg Turbo On R33 Gtst

manuel

By manuel,
in Engines & Forced Induction

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manuel Community Regular

manuel

Posted
Posted

Recently purchased a GCG r33 high flow which appears in good condition. Before i installed it i changed the wastegate to a rb20(10psi) wastegate. The original wastegate on it was an original 7psi one.Then went ahead on a straight foraward install with mechanic supervison and support.

My r33 gtst was running 190kw on 12 psi with stock turbo, pfc, 3inch exhaust, smic, , 040 fuel pump, profec b greedy boost controler, standard air box.

After install:

When i installed the gcg high flow, car started fine and then i took it for drive around the block. When the car came on boost it whistled loudly then the car hesitated and stalled. Got it started but it idled poor and was blowing white smoke when i reved it. it did not allow me to rev it. Manged to get it home home and then took all the plumbing off to inspect compressor wheel as i suspected a blown turbo. Lucky for me everything was good and wheel was still on the turbo.

I took of the rb 20 wastegate off and installed the original r33 wastegate which is the same as my stock turbo. Started the car and took it for a drive. This time i drove it on 7psi stock boost of wastegate and not 10psi(rb20). The car ran well however it has a small miss in the low rev ranges.

I have z32 airflow meter, injectors and retune planned for next month

Is this normal behaviour for an untuned turbo upgrade?

What are your thoughts on this

please help.

Dobz Experienced

Dobz

Posted
Posted

Winding up the boost on a stock r33 gts-t is whats going wrong. They don't mind carrying on even with small psi increases, as far as I know Nissan did this to discourage modifying by making it harder than just winding boost up. Gone are the R32 gts-t days where you could wind them up to 16psi with a decent intercooler and exhaust, providing the turbine wheel didn't spit out off first.

MrStabby Grand Master

MrStabby

Posted
Posted

Whistling/stalling was probably an air leak, and you would expect black smoke in that case. White smoke is burning oil, which could mean the turbos bearing seal is stuffed, which probably means the bearing is stuffed. Does the wheel turn smoothly? Is it still burning oil (because changing the wastegate actuator shouldnt have any impact). If its stopped burning oil i have NFI

manuel Community Regular

manuel

Posted
  • Author
Posted

Thanks for advice guys, problem has been fixed.

1. Hose between throttle body and intake pipe was leaking air.

2. irridium plugs were fouled so i cleaned them with prepsol and gapped them to .8

Car runs perfect on 7psi with gcg turbo and pfc current tune. it appears that the car can only handle 7psi on current tune as anything hire than this will foul the plugs.

PM-R33 Grand Master

PM-R33

Posted
Posted
Car runs perfect on 7psi with gcg turbo and pfc current tune. it appears that the car can only handle 7psi on current tune as anything hire than this will foul the plugs.

That doesn't make sense.

T04GTR Grand Master

T04GTR

Posted
Posted

you did change the oil supply line to the turbo to a non standard one or modify the stock one by drilling out ALL the oil restrictors in the bangos and bolts?

if not the whissle was the comp wheel eating the comp cover because the thust bearing has failed fom not enough oil

manuel Community Regular

manuel

Posted
  • Author
Posted
you did change the oil supply line to the turbo to a non standard one or modify the stock one by drilling out ALL the oil restrictors in the bangos and bolts?

if not the whissle was the comp wheel eating the comp cover because the thust bearing has failed fom not enough oil

Why do i need to modify oil lines if im only replacing my stock r33 turbo with a gcg high flow. Both turbos look the same and all lines bolt up perfectly. The gcg turbo has different internals and new ball bearing cartridge. It is a direct bolt on fit.

Anyway we dont need to continue the thread cause the car runs perfect, all problems have been sorted, thanks guys.

tridentt150v Grand Master

tridentt150v

Posted
Posted

He doesn't need to modify the oil lines, he is replacing a BB with a BB, they still need to be restricted. If he removed any restrictions he would blow the turbo seal big time. Different if he was changing over to a PB turbo.

Ultimategtr Proficient

Ultimategtr

Posted
Posted

I thought the rule of thumb was that that Thrust/Journal Bearing cores needed a more oil where as Ball bearings only need a small amount?

When i put my hybrid j/bearing turbo on, I had the guy drill out the stock banjos and lines.

  • 2 years later...
BLK33GTS-t Enthusiast

BLK33GTS-t

Posted
Posted

This is 100% a vacuum/ boost leak, i just installed a GCG highflow myself, and forgot to tighten up on of the intercooler hoses properly. as soon as it was under load it popped off and behaved exactly as the car in this thread. I put the hose back on and tightned her up... no worries mate!

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