[1.2gees]

OK, here are a few findings:

Firstoff, the avarage motronic DME (with sequential injection) has the capability to alter timing, AND fuel mixture, between the firing of one cylinder to the next! It has the ability to pick up on rpm change from about 2.5degrees of crank rotation. Timing/mixture are also changed on the fly, keeping emissions/fuel consumption in check at all times (there are exceptions, more on that later). My point? Duplicating a performance chip at some point, maybe. Upgrading (extensively anyway) the parameters in the eprom chip myself? No way.

The most power limiting single thing on a 944 NA (as well as most other motronic, specially early motronic/L-jetronic equipped cars) motor is the AFM. The spring tension on the barn door flap is THE single most restrictive part of the intake, diameter wise alone, the end of the intake (at the fender), is the second most restrictive part of the intake system. The mass of the flap itself/spring tension both delay the intial response, and open past the point required by the engine air flow through the intake causing a mixture overly rich(very slightly, but I'm discussing every aspect of this I can think of). The former is the bigger problem of the two by far however.

My first idea of upgrading this system without spending any $ was to back off the spring tension off the AFM, and keep it at that. However there's a couple of problems with this, The velocity of the moving sensor flap(after the throttle is suddenly opened), will open the flap even more vs. extra movement at stock tension. Also, another initial downside, perpahs more important, looked like the flap would be open all the way, before it would with the stock setting on the spring. Which would make the car run much richer than required, since the AFM door movement would not be linear to the air flow, as it was with the stock setting.

Still with me?

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It's all the driver...