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Why not just one turbo? (archive)

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Posted by Phadrus on September 24, 2001 at 20:16:31:

In Reply to: My twin turbo 535i will be tommorrow...(more) posted by Pat P on September 24, 2001 at 20:02:26:

It seems like a single, well designed turbo would not only have been cheaper, but easier to install. If fast spoolup was desired, then a ceramic ball bearing Garrett turbo would seem like the way to go. I can't imagine that changing plugs on this car would be a real chore...

Still, I would love to see some pics and hear about how it goes. Are you using the stock AFM or have you switched over to a MAS? Why a 2.5" exhaust? My Volvo 745T has a custom 2.5" setup for around 200hp, seems like a 3" setup would be the ticket for low backpressure which would contribute to faster spoolup in a 300+hp car. Did you lower the compression ratio or is this a stock motor? How many miles do you have on the motor?

As a point of comparison, my E28 535i (with 230K+ miles at the time) on Autothority's dyno in Northern VA ran 178hp and 232ft/lbs of torque uncorrected at the rear wheels with the Autothority MAS and custom chip, MM300 exhaust system, and ported exhaust manifolds.

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