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Rb25Det Boost Issue

marto184

By marto184,
in Engines & Forced Induction

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marto184 Collaborator

marto184

Posted
Posted

So i just bought myself a Series 2 gtst and for some reason even when my stock boost gauge is only hitting the first line above the 0 line it pops its guts out. This only happens before about 4-5000rpm. After that it seems fine... :/

Is there any specific thing that could be making this happen

Cheers

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Excuses Community Regular

Excuses

Posted
Posted

+1 to boost leaks.

+1 to missfiring, all of them cause that issue. Change your plugs ( might as well gap the. At .8 while your replacing ) and just dble check airlines, cooler piping and check to make sure the previous owner actually has the right lines from actuator and turbo.

marto184 Collaborator

marto184

Posted
  • Author
Posted

i have a turbosmart tee piece, r33 gtr sidemount, and a 3 inch system. Nothing major. I replumbed the controller from the actuator to the intake pipe myself with new vacuum line just to make sure. If i i turn the boost down it doesnt happen as bad. Ill try replacing the piping from the turbo right through.

Have just bought some bcpr6es plugs. gapped to .8 im putting them in this afternoon. should be helpful i hope :D

Daza33 Contributor

Daza33

Posted
Posted

I have a similar issue to this, don't want to start a new thread about it though.

I bought my Skyline about a month and a half ago, drove like a dream. It had yellow jackets, FMIC, pod, cat back exhaust (punched cat). I put a JJR 3" bellmouth dump on it and a turbosmart boost tee. Drove nice on 11psi, then a few weeks ago i started it up and it was missing at 4500+ rpm.

So far I have replaced plugs, gapped to .8mm, running actuator pressure boost and cleaned the AFM. Still misfires, seems to happen more in 2nd and 3rd gear. It also has a leaking turbo-dump gasket, thinking the dump flange isn't straight as I put a genuine Nissan one on it

Anyone have any ideas what it could be? Running boost off the actuator pressure it still hits about 9psi, and I have checked the coil packs already, although one had a spring that had less tension than others.

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

I have a similar issue to this, don't want to start a new thread about it though.

I bought my Skyline about a month and a half ago, drove like a dream. It had yellow jackets, FMIC, pod, cat back exhaust (punched cat). I put a JJR 3" bellmouth dump on it and a turbosmart boost tee. Drove nice on 11psi, then a few weeks ago i started it up and it was missing at 4500+ rpm.

So far I have replaced plugs, gapped to .8mm, running actuator pressure boost and cleaned the AFM. Still misfires, seems to happen more in 2nd and 3rd gear. It also has a leaking turbo-dump gasket, thinking the dump flange isn't straight as I put a genuine Nissan one on it

Anyone have any ideas what it could be? Running boost off the actuator pressure it still hits about 9psi, and I have checked the coil packs already, although one had a spring that had less tension than others.

Its ur coilpacks

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

If I increase my boost, will it lean my mixture?

Possibly. Depends how much boost and if ur tune has been done on higher boost.

The yellow jackets fail All the time. If u have any stock coil packs that work u can diagnose which one is the issue.

marto184 Collaborator

marto184

Posted
  • Author
Posted

yeah dan, i might drop into the dyno and get it done right. get it tuned to 12psi and leave it. im even planning on selling the blitz kit that i have on the car and just fitting the stock pipe back in and using the stock bov. i like the flutter sound better anyway :D

Daza33 Contributor

Daza33

Posted
Posted

Just thought id update,

got my splitfire coilpacks today, fitted em, misfire gone. I now am of the opinion that Yellow Jackets are cheap for a reason (they are shit). A guy at Just Jap told me the other week that they got their JJR Coil Packs from the same factory and they ended up binning them rather than selling em cause they had so many fail.

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