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seeing as i dont exactly understand how turbo works i thought i would ask this question. if you have a stock engine and add a turbo.... does that give u worse gas mileage? or is it unaffected.

i would figure it would be unaffected because doesnt turbo just push more air into the cylinder? in which case its not that your adding more gas into the cylinder.... just more air... more O2 right?

i guess the only way it would decrease your mileage is cause of higher revs.... higher revs means worse mileage right?
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people confuse me!

 
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guy of course you gonna eat more gas on your car..and yes less millege..my friend has a turbo si..don't know how many psi..only 250km one tank..

 
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No. Don't theorize when you really have no idea. It sound lame. Sorry dude, Ihad to say it.

A turbo turns by way of the exhaust gases, so it doesn't rob your car of as much horsepower a supercharger would (which turns off of being hooked up to the crank shaft). However, a turbo blocks the shockwave tuning effect in an exhaust which adds power. Anyway, got sidetracked there for a moment. Adding air in and of itself beyond the amount required does not help. You need to add in fuel too. A turbo adds in the air, but the ECU senses that air and adds some gas so that the air/fuel ratio maps for the various rpm ranges are balanced out.

It's all about forcing in more fuel and air into the combustion chamber. That creates a bigger bang and more power.

 
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so that means it will use more gas..haha.

 
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Simple, more air or less air restriction, the ecu will compensate with gas, plus everything else Gray said!

 
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plus if you had a turbo, you know damn well you'll be reving so much to spool that thing