E46Fanatics - View Single Post - If turbos give better fuel economy why don't all econobox have them
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Old 12-20-2012, 11:30 PM   #81
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Join Date: Feb 2004
Location: NYC/NJ
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My Ride: S2000+Wrangler
Originally Posted by atinybug View Post
Size of the turbo doesnt have anything to do with psi, I meant to reach full boost at that low rpm the boost probably isn't that high.
A turbo is spooled by how much air is shoved through it. While a GT30 might spool at 3000rpm (fully) in an S2000, the same turbo in a mack truck will spool far faster due to the amount of air the truck motor pushes. So, if he is running a motorcycle turbo on an MR2, the airflow might be considerably greater. Having said that, I don't know too much detail in the setup, since like I said, I saw the car that one time, so I guess those that are more knowledgable in this spectrum can clarify a bit more.
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