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> Boosting Issues?
post Apr 21, 2011 - 11:32 AM
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texasnick

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Hey guys,

Just got a 3" exhaust fitted from the turbo back. I love it. It sounds great. However, now that I can hear the turbo a lot better, I've noticed an issue the past couple of nights driving around.

When at full throttle, it almost sounds like I can hear the turbo surging. I'm not sure if this is compressor surge, but the best way I can describe it is that it's a sort of pulsating noise. It only happens at full throttle when I am hitting around 13 psi. It also seems like the boost gauge I have installed vibrates coincidentally with this noise. The variation in pressure is probably around 0.5-1 psi. It won't do it in first gear (at 10 psi), but whenever I boost above that in the higher gears it seems to happen.

Anyone know what could cause this? It seems to be like it could be the T-VSV since it won't happen at 10 psi. Any self-tests I can do to find the culprit?

Another interesting phenomenon I get is that sometimes, not always, boost will build to 10 psi quickly and then kind of pause there, and then it will hit 13 quickly. I'm kind of thinking the two issues are related somehow.

Car is a 94 st205 WRC completely stock aside from the 3" tubo-back.

Thanks
Nick

Posts in this topic
- texasnick   Boosting Issues?   Apr 21, 2011 - 11:32 AM
- - cax_11   Am experiencing the exact same issue, am getting t...   Apr 21, 2011 - 10:39 PM
- - delusionz   is the power delivery still smooth though? from w...   Apr 22, 2011 - 1:13 AM
- - cax_11   precisely my thoughts   Apr 22, 2011 - 7:10 AM
- - texasnick   Power delivery is still smooth as far as I can tel...   Apr 25, 2011 - 2:27 PM


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