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Old 05-31-2009, 11:09 AM   #115
BimmerDude18
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Join Date: Nov 2004
Location: DeLand Florida
Posts: 2,910
My Ride: 1998 528i
Quote:
Originally Posted by ritos530i View Post
I hear a lot of people talk about disadvantages but none of them have been confirmed nor tested that i can see. I would like to finish the car and just race whoever is a nonbeliever. I would be very happy to discuss the details of the disadvantages if interested. I personally thank that the rear mounted turbo has more of an advantage than a front mount.
Well, its "less efficient," you have 20' of extra oil lines, and the distance means that you have let your exhaust cool some before reaching the turbo, so you've lost some of the exhaust energy here.

The efficiency arguement comes in because you run a smaller turbo in the rear (typically) to make up for energy losses on the engine side of the exhaust housing, as a result, when you run higher boost and CFM levels, the turbo is a bit small...
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1998 528i 5-speed Work in progress
1988 Toyota Pickup (4WD 5-speed) daily
2007 San Marino Blue 350z 6-speed sold
1996 328i 5-speed sold


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