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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 > VAC stage 1 or 3 cylinder head with n54 forged piston kit



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      11-23-2010, 04:11 PM   #23
enrita
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Originally Posted by ultimateendz View Post
they didnt quote me on the labor yet..unless it was rolled into the price but i doubt it...id assume about 1500 in labor
mmm gonna be more than that for sure. if you open the engine you need to change lots of parts.
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      11-23-2010, 05:27 PM   #24
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subscribed, Ultimateendz and Alpina plz let us all know what kinda Piston and internals you're going for at the end since I am interested also.

Thanks.
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      11-23-2010, 05:29 PM   #25
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Originally Posted by Trojan4evr View Post
subscribed, Ultimateendz and Alpina plz let us all know what kinda Piston and internals you're going for at the end since I am interested also.

Thanks.
you got it....from the info ive collected so far it seems ill be going 9.5:1 compression
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      11-23-2010, 05:47 PM   #26
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Quote:
Originally Posted by vasillalov View Post
Sorry, but aggressive cams are not good for FI! Aggressive cams profiles generally have an overlap and you have a situation where both the intake and the exhaust valves are open. For NA engines this works great because it creates an additional suction effect on the intake side so that more air can be crammed in.

In FI cars this will create all kinds of havoc because the intake manifold is already pressurized by the turbos. Aggressive cams with overlap will simply cause a boost drop at best and quite possibly your engine will be running rich as the ECU tries to add fuel for air that managed to escape through the exhaust valves!
not always true, as shown on the s/m5x based motors and BavSol cams/head

BavSol cams idling, obviously aggressive:



dyno charts showing gains, also aggressive :



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      11-23-2010, 05:52 PM   #27
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Quote:
Originally Posted by Sniz View Post
not always true, as shown on the s/m5x based motors and BavSol cams/head

BavSol cams idling, obviously aggressive:

dyno charts showing gains, also aggressive :
OMG what a sound ! And what numbers !
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      11-23-2010, 05:55 PM   #28
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Originally Posted by tscdennab View Post
OMG what a sound ! And what numbers !
not bad huh

Donovan's e30 is on stock cams still, I cant imagine how fast it will be w a set of these puppies in it.

so far 156.8mph on stock cams.......over 160mph all motor/turbo w BavSol billett's??? probably.


now the ? will be how will the n54 react to more aggressive cams and proper tuning, it wont be easy, but it will be done eventually.

From what i've heard, a race prepped head will yield large gains on this motor, I have to imagine better breathing up top w/ the right cams and a proper turbo and you will see a HP/TQ curve like that above if not even better.



900whp and almost 600wtq at 8,000rpms must be fun
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