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Originally posted by Tired2
One, I have been looking for a GM IAT (air temp) sensor, but I have not had luck finding the thread in type at the junk yard. I found lots of rubber press in style, but no thread in ones... I think I'll buy one instead of junkyarding it, but that led me to wonder... why use the GM one and worry about threading it into the manifold when the stock setup already has a sensor? Has anyone used the stock sensor on megasquirt? Is it suitable for Turbo application? If so, are the calibration values available somewhere?
You can certainly use the stock IAT sensor, but the sensor cannot be shared between the MegaSquirt ECU and stock PCM. There are calibration values for it here:
http://kb.symtechlabs.com/megasquirt:temp_calib
Originally posted by Tired2
Secondly, and somewhat related... Can anyone let me know what ECU functions still remain on the stock ECU if I convert over to Megasquirt with full fuel and spark? I believe it controls the alternator field, the air conditioning pressure sensor/clutch/fan, and (unless I rewire it) the speed sensor and speedo, and the Cooling Fan(s). What other tidbits does the stock ECU handle? Does the stock ECU still use the IAT sensor for anything? (I realize it uses the CLT sensor for the fans) If I steal the crank angle sensor, will I lose the built in Tach, or is that run from the cam pos sensor? I'll eventually run a tacho output from the MS, but just curious if the stock ECU will still have RPM after I steal the crank angle sensor for MS (My guess is no)... Thanks in advance.
The MegaSquirt ECU won't control the alternator, cooling fans, A/C clutch, and tachometer by default. You can add circuits to it to control the cooling fan relays, A/C clutch relay, and tachometer, though. You can also use an external alternator voltage regulator to control the alternator. The speedometer isn't controlled by the stock PCM, but the vehicle speed and crank sensors are powered by the stock PCM; so if you remove the stock PCM you will have to connect these sensors to an alternate power supply (12V works).-----------------------------------------
- http://www.symtechlabs.com -
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