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strange whistle under boost
Posted by TSR [Email] (more from TSR) on Mon, 3 Jan 2005 15:50:37
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In my modified 1989 SPG 2.1 head 8.4:1 compression 3.0 bar FPR tweaked APC, I am running about 19PSI peak boost and holding at 15PSI. Everything in the motor is new with under 10,000 miles. All new hoses. Under high boost levels in 5th and 4th gear I get a deep tone sound. I have checked all the obvious things. I am sure it is under the hood. No bad vac lines....Could the blow off valve make this sound? it is the orignial?
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