Date: Sat, 1 Jan 2005 16:14:59 GMT From: hohnospamlid.invalid (Goran Larsson) Subject: Re: 9-3 Aero woes
In article <41D6C8A6.4010300nospamo.com>, ma_twain <ma_twainnospamo.com> wrote: > Gary Fritz wrote: > > Not with the 9-5 Aero, you can't. The instant you let off the gas and > > hit the clutch to shift, the turbo **instantly** spins down. > Interesting information. But wrong. He has posted this misinformation previously instead of fixing whetever it is that is wrong with his engine. > How does it spin down so quickly - a brake of > some type? No brake. There is a bypass valve that opens to connect the pressure tube, between the output side of the turbo and the throttle, to the inlet side of the turbo. This keeps the air circulating through the turbo preventing it to stop. If the bypass valve does not open (broken or the control hose has been disconnected) then the air pressure builds up between the turbo output and the closed throttle plate. This will cause a turbo stall. Every manufacturer of turbo charged engines will do whatever is needed to keep the turbo spinning. Adding a brake to spin down the turbo is not something they will waste money on. > A spinning turbo at full boost is a > not a minor amount of centifugal motion. True. When the turbo is stopped, due to the shock wave from the air that was unable to go into the engine due to the closed throttle, there is a high probability that the turbo is damaged. -- G–ran Larsson http://www.nospam.com/saab/
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