mike,
the DME knowingly runs the car richer when the engine is cold. This is what it's programmed to do. Let's just say it starts getting a signal from the 02 sensor, this'll only help the engine run at exactly how rich the DME wants it to be. In any case, when the DME thinks the engine is cold, it'll run richer.
Gipper, the Porsche MAFs are expensive, cause there aren't many of them floating around.
marksportcts, where to get a trouble code decoder? Oh I dunno, dealer?
Im6y, I don't think I need to modify the air temp signal in the AFM. I'm going to make the car run richer only through making the DME think the engine is cold. This optimizes the air/fuel mixture, as well as the timing for more power. Also, keep in mind, with the holes offsetting how much the flap is pushed vs. the tension, the movement of the flap after the mods should be close to it's movement before. Only less ressistance to air movement, don't need to mess with air temp. signal. Or at least that's what I think. No doubt there'd be a bigger benefit from a hot wire MAF, but that'd cost money!
(As you've noted, not much market for this upgrade on 944 NAs). Have the book, and read it through, I need an adjustible switch that'll alter the ressistance between the values that the DME would expect from the temperature sensor. Thinking about the resistor there, this doesn't let you adjust everything back to stock. I'd rather set my car up for more power, and leave it there, but still have the ability to switch to better milage (next time the car's started maybe?).
porsche1987_944s, thanks a bunch for the link, this is pretty much what I'm suggesting, except that an adjustible switch, in place of the ressistor for the ability to get fuel economy, emissions, etc. back as desired.
Ahmet
EDIT: I see what you're saying about the temp. sensor inside the AFM, so timing is advanced even more right? Perhaps that's doable, and another mod, however I'd like to just add a ressistor to the air intake temperature sensor's output, rather than have it totally out of service. The best thing perhaps is, I can try this, without spending more than $5, and it'd be reversible. I should take a timing light, and see if the timing is advanced even more, when I fill up the air box with ice!
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It's all the driver...
[This message has been edited by 1.2gees (edited 04-23-2001).]