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      01-06-2013, 02:32 AM   #44

Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

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2008 BMW 335i  [3.75]
Originally Posted by Spoolin1 View Post
What is the stock compression on the N54? If I were you, I'd run 10.5:1 comp pistons. You should get better off turbo power and a lot better spool up with the turbo's and more power per psi of boost (the turbo's will run in a better efficiency area at a lower boost for the same power you'd get with more boost at 9.5:1 comp). In my stock block Honda S2000, it's comp is 11:1 and I run 35 psi of boost; around 850 whp.
No one has swapped out the internals yet on the N54 because:
  • We still haven't hit the limits of the stock internals (no bent rods or failed pistons)
  • The compression ratio has not been maxxed out on any of the current setups (including Dzenno's 550 WHP RB Turbo setups or Shiv's 600 WHP Single Turbo)

I expect this to change when the Vargas Stage 3 Turbos & ProEFI are both released. Once people start seeing 700-800 WHP & are using a standalone, we're gonna start seeing the OEM internals fail (~3 times the OEM WHP)