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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Turbo Whoosh Noise on deceleratingViews : 2055 Replies : 18Users Viewing This Thread : |
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Jul 7th, 2018, 17:57 | #1 |
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Turbo Whoosh Noise on decelerating
As above. Turbo is Standard 16T on a 97 V70r - Stage 1 remap that boosted well to 13psi+. Over the last couple of days, it's started boosting to around 8psi only and a fairly audible whooshing/rush of air noise is heard on deceleration. It never did that before and it doesn't do it on acceleration, oddly. Is this a faulty wastegate or dump valve and why would that cause a loss of around 5-6 psi of boost pressure?? 🤔 TIA
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