TwinTurbo.NET: Nissan 300ZX forum - It was surging for sure.
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Subject It was surging for sure.
     
Posted by Woody75 (Denver) on March 15, 2004 at 11:53 PM
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In Reply To Cool... you have the unofficial record so far with these posted by degradated on March 15, 2004 at 11:42 PM
     
Message No detnation at all. I had 2-3 people with their ears in the engien bay on almost every run jsut to make sure (B&B can be loud). You could hear and see the engine surging. The BOVs would let the air out everytime it surged so we thought it was them. I put the stock recircs back on andI still had it so we thought it was the wastegates. Then I talked to Mike Smith and showed him my other dynos with the waves. He thought it could be the boost controller tryig to play catch up. I have the new Profec-B. It has the warning limiter on it and I thought maybe I was hitting it everytime. So I cranked it way up so it was out of the equation. I also might have had a kink in the boost line to the controller. Problem went away.

So I think the boost was turned up more than I thought and was hitting the limiter everytime (set at 19.5). Then it would back off the boost, but since my foot was on the gas still it would try to build it again. I think the peak boost gauge was reading the boost level after it would kick it down.

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