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914World.com _ 914World Garage _ MegaSquirt Pre-Start testing - some ?

Posted by: 3d914 Nov 24 2003, 10:42 AM

I have the MS installation hooked up and taking to MegaTune on my Porsche 914. During the prestart testing the sensors checked out with reasonable values except the TPS & MAT sensors. I have the Barometric option OFF.

The MAT was reading 169, but it was a chilli 55deg here in Phoenix this morning.

The TPS was showing a high value 245 for the closed position, and 80 for the WOT position. I have the TPS rotating CW - resistance increasing with CW rotation.

Any thoughts?

TIA,

Posted by: DNHunt Nov 24 2003, 11:23 AM

3d914

Make sure you include the corresponding .inc files in your Megatune directory otherwise it will use the default files that correspond to the GM sensors that Bruce used.

You will set the TPS values in Megatune so don't worry too much about that.

If all of the above is right then recheck the wiring

Dave

Posted by: 3d914 Nov 24 2003, 12:32 PM

Dave,

The values I indicated for the TPS were from MegaTune TPS configuration. That's what I thought was weird.

Also, I thought I put all your .inc files in the directory, but I can double-check when I get home.

Posted by: 3d914 Nov 24 2003, 02:05 PM

I checked the INC files at lunch, and I must have overwritten Dave's files with some from MS. Just replaced them and the MAT value was fine.

The TPS however is still behaving peculiar. I get voltage increase from 1.45v at closed throttle to 3.4v at WOT. I now suspect the ground connection for the TPS, as MS has a specific pin #19 for this. I'll have to check this when I get home.

TIA,