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Lorenfb Lorenfb is offline
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Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,352
Please, I'm no expert, and I apologize for that impression. I just try and
convey what I've learned over the last 20 years being involved with Porsches.

To answer your question, yes. Once you change the intake and exhaust systems,
performance gains are possible with chip changes. I think the changes need to
be setup using a dyno to maximize the results and to avoid "holes" in the
torque curve.

The same goes for the MAF installation. Potentially better throttle response can
be achieved, but I've heard of a lot problems with them. The main reason why
all OEMs use them is for better fuel metering over the full throttle range. The
AFM only is effective for about 60 to 70% of the throttle opening. After that,
the DME calculates the fuel metering based on RPMs. It's a very costly design
effort to develop a good MAF system (mechanical & electronic) generally
requiring the resources of a Porsche/Bosch for a very viable and reliable unit.
Even Porsche, on the Boxster and 996, has reliability problems now with
the MAF.
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Old 01-23-2004, 08:52 PM
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