Question about boost/MPG?
Senior Member
Joined: Jun 2006
Posts: 1,913
From: Harleysville, PA
RE: Question about boost/MPG?
ORIGINAL: Kedawei
That doesn't make sense.A supercharger is directly connected to the crankshaft by a belt. That means for every revolution of the crankshaft, the supercharger will turn a fixed number of revolutions. It's just like a cam. Without that direct, constantdrive,cam timing could not be achievable, and motors wouldn't work so well. Transmissions operate on the same principle (gearing), as well as anything connected to the crankshaft.
That doesn't make sense.A supercharger is directly connected to the crankshaft by a belt. That means for every revolution of the crankshaft, the supercharger will turn a fixed number of revolutions. It's just like a cam. Without that direct, constantdrive,cam timing could not be achievable, and motors wouldn't work so well. Transmissions operate on the same principle (gearing), as well as anything connected to the crankshaft.
HCF Member
Joined: Jun 2006
Posts: 452
From: jacksonville, Fl
RE: Question about boost/MPG?
Well the bottom line here is that its a lot easier to stay out of boost with a turbo instead of a sc, granted you arent using a tiny little turbo that spools at 2k. You will probably see a slight increase in fuel economy on the highway and a slight decrease inthe city so depending on where your drivingyour probably going to break even or maybe lose a2-3mpg tops.Also, a big variable on your fuel economy will be the quality of your tune 
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Senior Member
Joined: Sep 2005
Posts: 1,930
From:
RE: Question about boost/MPG?
ORIGINAL: SovXietday
In order to have boost you need copious amounts of air. If the throttle isn't letting enough air in you won't get boost no matter how fast the supercharger rotors are moving.
ORIGINAL: Kedawei
That doesn't make sense.A supercharger is directly connected to the crankshaft by a belt. That means for every revolution of the crankshaft, the supercharger will turn a fixed number of revolutions. It's just like a cam. Without that direct, constantdrive,cam timing could not be achievable, and motors wouldn't work so well. Transmissions operate on the same principle (gearing), as well as anything connected to the crankshaft.
That doesn't make sense.A supercharger is directly connected to the crankshaft by a belt. That means for every revolution of the crankshaft, the supercharger will turn a fixed number of revolutions. It's just like a cam. Without that direct, constantdrive,cam timing could not be achievable, and motors wouldn't work so well. Transmissions operate on the same principle (gearing), as well as anything connected to the crankshaft.
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