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32 Gtr Boosting Prob

OIR32

By OIR32,
in Engines & Forced Induction

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OIR32 Enthusiast

OIR32

Posted
Posted

hi guys.. i need some help.. ive just installed a greddy dual boost controller and gauge.. i took it for a drive today and tryed changing the boost levels and it didnt do shit! when i bought the car old mate said he removed the boost pill?? i dont know what psi 32 gtr's with stock turbs are supposed to run but the gauge read 15 psi and a spike of 17 psi.. seems to high to me but is that what the actuators are set at???? i wanna know what people think..... i could have installed the controller wrong? or something to do with the boost pill

Any input would be awesome!! thanks

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Slattery Gts-t Contributor

Slattery Gts-t

Posted
Posted

Hey mate,

Im pretty sure stock boost on a R32 GTR is around 10psi but certainly not 15psi

I think he might be talking about the boost restrictor which is a little piece of pipe that is inside the vacuum line that runs from a T piece in the line to the wastegate, The line bleeds a bit of air back into the intake and has a restrictor inside of it, if you remove it it lets it bleed a bit more air and increases boost

If you have a full free flowing exhaust and a pod then removing it may just as well increase it to 15PSI and even cause a small spike but id put my money on the spike being caused by the boost controller not being set up properly

Anyone please correct me if i am wrong as iv only had experience with RB25'S

OIR32 Enthusiast

OIR32

Posted
  • Author
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Hey mate,

Im pretty sure stock boost on a R32 GTR is around 10psi but certainly not 15psi

I think he might be talking about the boost restrictor which is a little piece of pipe that is inside the vacuum line that runs from a T piece in the line to the wastegate, The line bleeds a bit of air back into the intake and has a restrictor inside of it, if you remove it it lets it bleed a bit more air and increases boost

If you have a full free flowing exhaust and a pod then removing it may just as well increase it to 15PSI and even cause a small spike but id put my money on the spike being caused by the boost controller not being set up properly

Anyone please correct me if i am wrong as iv only had experience with RB25'S

thanks mate,... it does have a nismo catback, pods and m's intakes. i could have set it up wrong, second hand with no instructions. especially the waste gate side twin turbs = a couple of t peices, making hoses the same length and tthis being my 1st rb26...one thing i was confused about was where to put the line that comes from the COM port of the boost solenoid... i t'd it into the black pipe work thats under the larger intake pipework which follows the intercooler piping around and goes to the 2 bovs... the other side of the t peice goes to a hard pipe that runs around the back of the motor...

OIR32 Enthusiast

OIR32

Posted
  • Author
Posted

thanks mate,... it does have a nismo catback, pods and m's intakes. i could have set it up wrong, second hand with no instructions. especially the waste gate side twin turbs = a couple of t peices, making hoses the same length and tthis being my 1st rb26...one thing i was confused about was where to put the line that comes from the COM port of the boost solenoid... i t'd it into the black pipe work thats under the larger intake pipework which follows the intercooler piping around and goes to the 2 bovs... the other side of the t peice goes to a hard pipe that runs around the back of the motor...

i dont know if thats the right spot but i heard its just waste air coming out of that hose.
OIR32 Enthusiast

OIR32

Posted
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rido fella's.. i sorted the problem out. i didnt have a port running to a vac/boost source.. it runs on stock 10 psi and high boost of about 14, hopefully thats not to high a boost. theres only one more problem.. on the high boost setting with the foot down it has a boost spike that continually goes up and down from about 14 to 17 psi. if on low boost i change the boost % to the same psi as the high boost% in doesnt spike.. seems weird.. can anyone give me some info on that, thanks heaps

OIR32 Enthusiast

OIR32

Posted
  • Author
Posted

It's probably not boost %, but rather duty cycle %. Gain is most likely the difference between the 2 settings, a high gain setting will cause spiking.

agh ok thanks lance.. ill turn the gain down on high boost. any idea what it should be set at? thanks mate
Moodles2 Grand Master

Moodles2

Posted
Posted

Getting gain right is trial and error, too high and boost will spike (but build boost really fast) whereas a setting too low, the boost will be stable (but won't build as fast). It's a matter of finding the right setting that doesn't spike, but still builds boost fast.

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