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Boost Problems

Gold Rays

By Gold Rays,
in Engines & Forced Induction

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Gold Rays Collaborator

Gold Rays

Posted
Posted

Hi all,

At the moment I'm only running 8psi on my 95 S1 R33 and when I hit boost in 4th gear the boost spikes and the engine seems to cough and splatter.... its weird. It never used to happen before I put my hybrid front mount on and put a T piece in. Its not hitting the rev limiter, seems more like fuel cut or something, it couldn't be boost cut althou it does spike up to 14psi some times if I give it heaps. A list of what mods I've done are below. Any help or knowledge on how to fix the problem would be great.

Cheers

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BOOSTD Mentor

BOOSTD

Posted
Posted

Could be plug gaps or boost cut.

Boost cut is a A/F versus time versus rpm calculation not boost level, which means It might not cut at a certain boost level all the time ,but, just when loaded up. Be carefull with fuel cut defenders as they are easily set to low causing lean mixtures and detenation. hope that helps

plug gap should be ~.7mm

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muffas 180 Enthusiast

muffas 180

Posted
Posted

There is no such thing as boost cut. It is fuel cut. Standard ecu dont read boost pressures. They read the mass of air traveling through the AFM.

As BOOSTD said it is probably plug gaps. RB25DET's are very sensitive to plug gaps being bigger than .8mm when running more than standard boost levels. I recommend .7mm too.

Michael..

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Gold Rays Collaborator

Gold Rays

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Cheers guys

So what plugs do you recomend? I already have NGK platnum plugs but I'm not to sure of the gap.

I thought the GTSTs ran rich so even if u wind the boost up a little eg to 12psi, the engine shouldn't detonate.

I think it could be the crap turboX bleed valve causing most of the problems... Its could be time for an AVC-R

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