Re: Gas Mileage - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Gas Mileage
Posted by Dean (more from Dean) on Fri, 13 Oct 2000 10:11:57
In Reply to: Re: Gas Mileage, david hanley, Thu, 12 Oct 2000 18:59:47
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The wastegate only opens at boost pressures. It is closed most of the time. I have often thought about this issue. Yes, it would be great if it was open while cruising.
Yes the turbo make flow quieter. But mufflers do not have to be restrictive at the moderate flows during cruise to be effective.
The clutch only slips for a moment during shifts, while the throttle is not open very much, othewise your clutch will soon be trashed.
The torque converter only locks up in higher gears at moderate loads. This does not help much with some city driving profiles. So it is slipping during most of your city acceleration, and your energy consuption at steady speed, low speeds is not enough to compensate.
Stop and go, short trips, engine reheats are all energy expensive. Having the mpg's drop to 1/2 of highway is not unreasonable.
Did you check the tire pressures yet?
Posts in this Thread:
- Gas Mileage, David Hanley, Thu, 12 Oct 2000 16:36:02
- Re: Gas Mileage, PVR, Thu, 12 Oct 2000 21:57:05
- EPA says 29MPG your getting 35MPG at 80MPH???, Tony M, Thu, 12 Oct 2000 20:08:16
- Re: Gas Mileage, Dean, Thu, 12 Oct 2000 17:29:18
- Re: Gas Mileage, Bill D, Thu, 12 Oct 2000 17:26:28
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