Site News - 11/22 Member of the Year Voting
Date: Sun, 04 Mar 2007 17:22:35 +0000
From: Colin Stamp <>
Subject: Re: '99 9-5 hooter valve options?

On Sun, 04 Mar 2007 10:05:13 GMT, johannes <> wrote: > > >Dave Hinz wrote: >> >> I've got a '99 9-5 with the 170BHP 2.3L LPT engine. My hooter valve is >> hooting. I see vendors selling "upgraded" versions of same - do they >> really do anything or should I just buy a stock replacement part? If I >> can get some HP out of the deal I'm all for it. > >The function of the bypass valve is to keep the turbo spinning when going >off the pedal, thereby reducing turbo lag. I don't see how that can >increase HP. Shirley, by definition, reducing lag is the same thing as increasing the power available at the point where the turbo would have been lagging? Of course, the peak power of the engine won't go up, but that figure is pretty meaningless anyway. Cheers, Colin.

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