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      05-22-2017, 05:49 PM   #15
Pure Turbos
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Drives: Turbo Cars
Join Date: Nov 2013
Location: Oceanside, CA

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Quote:
Originally Posted by BMW M4 PWR View Post
There's not much to make!? With a PTF BM3, JB4 w/ PI and some good custom tuning you should have a monster** All we need is the hardware (generally the easy part) And if we have N55 singles already then the S55 shouldn't be far behind being their architecture is nearly identical.��
You guys can make a new thread to discuss single turbo. Single turbo is not ideal on S55. It would require the O2 sensors to be installed upstream of the turbo, in the manifold, to maintain the bank to bank fuel trimming. Which is critical. Yet the O2 sensors in the back pressure of the manifold, introduces a bias, and skews the AFR value (see N54 single turbos). Also causes O2 sensor premature failure. It can work, but it's not the "right" way, nor a clean way to do it.

Anyways, another S55 PURE result popped up over the weekend. 647whp on stock fuel system. Details will be posted soon!
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