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      10-03-2012, 06:45 PM   #57
Mike Benvo
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Drives: Harrop SC M3 / E46 M3 / 7Turbo
Join Date: Apr 2008
Location: SoCal

Posts: 4,700
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Garage List
2008 BMW M3  [5.00]
1990 BMW 735i Turbo  [5.00]
2004 BMW M3  [0.00]
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Quote:
Originally Posted by m3an View Post
SC is much easier on an old skool simple setup as one can set the timing and use a FMU for fuel control as the boost is linear and the FMU is boost dependent. Set it up and drive it. Turbo tuning is always more of an art as boost is totally diff
True, X boost at Y RPM is always nice to work with. This versus tuning for the 'onset' of boost which can be different depending on exhaust gas flow at the turbine.

The 7 series runs quite good given I'm using the stock DME with a 4" MAF and they didn't even use MAF's back then! But only so much you can do with such outdated technology. And it is not using an FMU, everything is 100% run through Motronic 1.3, 8 bit. Useless. Makes much more sense to use a MAP based system, so that's my next project

And yes, o2 sensor placement is very important - not only for an accurate reading but for fuel trim correction as well.

(I let off on the shift because I'm afraid my automatic will explode)
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