Re: VACUUM PUMP FOR BRAKES - Saab 9-5 Bulletin Board - Saabnet.com
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Re: VACUUM PUMP FOR BRAKES
Posted by Dean (more from Dean) on Mon, 19 Mar 2012 10:08:32
In Reply to: VACUUM PUMP FOR BRAKES, saabsince 93b
[Profile/Gallery]
, Sun, 18 Mar 2012 21:24:01
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because?
My guess is that the autobox does not create throttle closed events that generate low manifold pressures as occurs when changing gears with a manual gear box. But autoboxes were around for years without these pumps. I do not know what changed. It might be a result of higher 'overdrive' running conditions to improve MPGs, which increases manifold pressures. I was told [2005] that the autoboxes had more of an overdrive ratio than manual gear boxes. That might be a result of trying to reduce the MPG penalty that autoboxes used to have.
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