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polizei polizei is offline
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Join Date: May 2007
Location: Collegeville, PA
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Originally Posted by Frank@AMS View Post
The T3 vs. T4 debate has been going on for a long time. You have to understand that you're working with 6 cylinders that produce a lot of exhaust flow. Utilizing the .68 T4 hot side, you would see almost no difference from a T3 housing in spool time. You would however see considerable gains in the upper RPM range. Also, with the new technology being incorporated, you are able to see improved spool time a bigger HP numbers. Billet compressor wheels are not only lighter, which helps quicken spool time, but they also have superior aerodynamic profiles that compress more air efficiently: less heat = more power. Ceramic ball-bearing center sections are more durable, have less friction, and donít require coolant unlike the original traditional ball-bearing units.
Hey Frank,

What turbo was installed on Tony's car when he was running the single turbo setup? In talking to Precision it sounds like there is a whopping $600 difference between the journal and ball bearing version of the 850R. Is there $600 worth of difference? When do you think full boost would be achieved on carrera cams with ball bearings versus journal bearings?
Andy - 1987 911 Carrera Coupe
Old 11-02-2010, 12:43 PM
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