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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > whats max psi of stock turbo?



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      01-27-2013, 09:40 AM   #1
diddlkiss
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whats max psi of stock turbo?

If I have DP(catless) DCI BV FMIC and meth,
whats the max psi of stock turbo with meth?
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      01-27-2013, 09:50 AM   #2
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2007 BMW 335i  [3.83]
Max PSI in the mid-range would be around 19psi. I would lower it for a DD setup. It tapers to redline at around 14-15 PSI i believe, as long as you are FBO.

There isnt a end-all-be-all specific PSI. It changes throughout the rev-band. You also have to consider the transmission and power/torque levels. An AT might run less boost in the mid-range to spare its transmission, while a 6MT goes balls to the wall.
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      01-27-2013, 12:44 PM   #3
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Turbos dont have max psi. They have a psi where they loose effiecency in making power. That is the ceiling.
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      01-27-2013, 12:51 PM   #4
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2007 BMW 335i  [3.83]
Quote:
Originally Posted by Gugs View Post
Turbos dont have max psi. They have a psi where they loose effiecency in making power. That is the ceiling.
Very true, I was more of stating the safe-ish operating PSIs that i would recommend. Im sure our turbos could make mid-20s PSI, but it wouldnt be for a long time nor safe.
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      01-27-2013, 01:04 PM   #5
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