MPS, ECU calibration theory, I need Jeff and Geoff, + more experts |
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MPS, ECU calibration theory, I need Jeff and Geoff, + more experts |
brant |
Feb 13 2006, 11:57 PM
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#1
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914 Wizard Group: Members Posts: 11,641 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
So after 2 days of searching and re-searching I have a theory.
follow with me here. My ECU is apparently bad. I have a good MPS but its an 049 (1.7) I happen to have a good ECU spare that is the 037 (1.7) model I know brad's website clearly says that the factory 73 2L set up used the 037ECU and 037MPS coupled with a ballast resistor (270 ohm) Jeff and Geoff, how close (or far) are the calibrations for the 049 versus 037 MPS units. what I'm theorizing, is could I avoid buying a ECU and paying calibration for my MPS.... (this is a junkyard motor that might not even run and before I spend more money I'm trying to get away with the parts I already have) Here is my thoughts: If I "borrowed" the wide band 02 from the race car could I possibly run the 037ECU and 049MPS, with the correct CHT and an adjustable reistat to compensate for my MPS? I could use the wide band to perform test runs under load and then adjust the reistat or adjust the MPS to try and get the correct ratio's.... Is this stupid? should I just buy an ECU and MPS instead? and since my motor is a 75 with plugged air ports, should I buy a 74 combination or stick with the 75 combination? (I'm guessing the 75 combo is set leaner for emissions purposes and I don't have emissions) ahhggghhhh..... I need brad anders to fix this beast. tia brant |
brant |
Feb 14 2006, 12:26 AM
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#2
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914 Wizard Group: Members Posts: 11,641 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
First let me thank you for taking the time to indulge my crazy ideas 1) I always heard the ECU's never failed. So when trying to get the motor to run on saturday I really didn't even suspect the ECU. I tested all of the components, spark, injectors, 23 wire harness to ECU for continuity, compression, and valve adjustment. It wouldn't even hit or fire at all. finally out of desperation I plugged in my 037 1.7 ECU and cranked it over. It not only hit, but started running on the very first crank. I put back on my ECU that came with the motor (rusty, no surviving part number) and again would not even hit. so I'm nearly positive that its the ECU and now I figure I can use the 037 or else buy one. 2) I know mixing and matching of components is NOT recommended. But since I happen to have an 037 ECU that works, I figured I could use the corresponding 1973 037MPS that fits my ECU for the 1973 2.0 (seems the 037 ECU is the only one that was used on both the 1.7 cars and also the 2.0 cars) Would it be a bad idea to backdate a 1975 motor (with no injection ports and backdated exhaust) to the 1973 F.I. specs? and finally, since I have access to this wideband I was being a cheap skate and thinking perhaps I could calibrate my ECU to an 037 spec by checking A/F ratio under load. I know I'm being a cheapskate, but I'm trying to get a junkyard motor to run with parts I have. I guess otherwise, I could still use the 1973 2.0 specs (unless that is a bad idea) and just pay the calibration fee without the ECU purchase fee. brant |
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