MPS, ECU calibration theory, I need Jeff and Geoff, + more experts Options

[brant]

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

[JeffBowlsby]

Its very unusual for an ECU to go bad. Do you have access to a known good ECU to swap in?

Not sure I can help but here are a few morsels:

The 037+049 MPS are not close at all calibration-wise.

Keep in mind that each system for each engine size and FI group of components uses a unique combination of pulse-width, injector flow rates and sensors, making interchangeability of components not optimum.

The TS2 ballast resistor, fixed or variable, is only effective during warm-up. Once warm-up temp is obtained the ECU takes over and the TS2 is not a factor in determining pulse-width.