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Gtr Half Boost

dilmah

By dilmah,
in Engines & Forced Induction

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justin911 Grand Master

justin911

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Posted

hmmmm im having the exact same problem with my 33 gtr. It only happens once or twice a month though.

It seems to make only 1/3 - 1/2 boost. Today when i noticed it i pulled over and turned the car off then back on straight away and the problem was fixed.

Because i switched the car off to fix the problem im guessing its not something mechanical ? also i dont think its my boost gauge thats the problem because you can tell the car is heaps slower when its happening. Im also using stock bov's.

wrxhoon in one of your posts above you mention

"Sometimes they will reset as soon as you back off but usualy you have to turn the ignition off ( from my experiance)."

just wondering what you mean by "they will reset", what is the 'they' ??

I spoke to Dilmah about his issue a while ago and i think he said once he got a pfc the issue hasnt come back.

besides getting a pfc... or trying a new boost solenoid?? anyone else got any tricks i should try ??

thanks :)

dilmah Community Regular

dilmah

Posted
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Posted

I've already sent this to Justin in a PM a while ago, but for the benefit of everyone I'll post it up here as well in case it helps someone.

I never really got to the root of the problem, I just disappeared.

I took it to RE Customs and they spent several hours on the dyno, etc. trying to reproduce the problem and they couldn't see it happen on demand. It was very intermittent and when it would happen, most of the time the only way to make it get full boost again was to turn the engine off and back on again.

RE Customs blew air through the wastegates of the turbos cos they thought they could be sticking, but it seemed fine. They told me the next step in troubleshooting would be to remove the turbos to get a better look at the wastegates, etc, but in a GTR, that's an 8 hour job cos they pretty much have to remove the left hand side of the engine bay to get to them.

I didn't go down that route cos it seemed to disappear and stop happening.

I mentioned it to racepace and they seemed to think it could also be the boost solenoid. I never asked them to look at it though.

Since RE Customs had a look it's only happened once more and that was more than 3-4 months ago.

I've since done a few more basic mods and it hasn't reappeared and it's been running fine.

Other suggestions were that it could be a faulty blow off valve or the engine protecting itself from overboost/pinging.

My car has had the boost restrictor removed, so it runs at 1 bar of boost all the time (about 14-15psi). New stock turbos (replaced by previous owner not long before I bought the car).

Good luck in tracking down your problem.

If you ever track down the problem, be sure to post it up and let us know :)

  • 4 weeks later...

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