What limits power on N54 with stock turbos?

TheFixer

Sergeant
Aug 16, 2020
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2008 535i
Depends on ambients I think. Summers here make me want meth. 100° and near 100° humidity the race FMIC struggles badly.
I'm in TN. Really humid here too. But will be moving to VA in a year or so. So ill probably not bother with it.
 

JohnDaviz

Lieutenant
Jan 6, 2019
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335i E92 DCT
One thing missing here as a power limitation imho, is the exhaust side on the stock turbo. The turbine housing is not designed for high HP output but quick spool.
I don´t know if anyone remembers how the stock n54 setup performes. But i barely feel any turbo and it rather feels like NA car.

Turbos like the HP650/800 have a bigger turbine housing which reduces the backpressure, reduces pumping losses, increases cylinder scavenging efficiency, which is a big bottleneck on the stock housing.
 
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SlowE93

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Jul 2, 2017
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Just a plane ticket away !
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E93
One thing missing here as a power limitation imho, is the exhaust side on the stock turbo. The turbine housing is not designed for high HP output but quick spool.
I don´t know if anyone remembers how the stock n54 setup performes. But i barely feel any turbo and it rather feels like NA car.

Turbos like the HP650/800 have a bigger turbine housing which reduces the backpressure, reduces pumping losses, increases cylinder scavenging efficiency, which is a big bottleneck on the stock housing.
I already said TURBOS 🙄
 
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