zx_drift Posted July 23, 2009 Share Posted July 23, 2009 So I have built a '81 Turbo motor for my car, have an '81 harness, and am getting ready to do the swap, but I just found out my ECU is for an '82. Will this cause any problems? If yes, does anyone have an '81 ECU they'd be willing to trade? Thanks guys, Quote Link to comment Share on other sites More sharing options...
zx_drift Posted July 25, 2009 Author Share Posted July 25, 2009 nobody knows? Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 25, 2009 Share Posted July 25, 2009 Do you have an auto trans? Are you running the CAS in the distributor or on the trigger wheel? Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 26, 2009 Share Posted July 26, 2009 It should work since the crank reference is the same signal. If you are absolutely sure the ecu is a 1982 or later, then you will have to go to that 8 lug connector where the dropping resistors plug into the harness (1 in and 6 separate resisted out) and bypass them. I just made a six into one with 7 male spade connectors and plugged that into the female plug on the harness. Use a meter to determine which is the 12 volt input. Quote Link to comment Share on other sites More sharing options...
zx_drift Posted July 26, 2009 Author Share Posted July 26, 2009 My ecu is for an 82 with an auto trans... my motor has the trigger wheel on the crank, not in the distributor, The car is manual transmission. Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 29, 2009 Share Posted July 29, 2009 The difference in ecus is that the 1981 uses an external dropping resistor pack on the harness while the 1982 and 1983 have the resistors in the ecu. The crank reference signalling should be the same. You have a 90 tooth pulley with a sensor that has two poles spaced halfway between two peaks which causes 180 pulses per crank revolution and a different pole for the 120 degree pulse. It's really 3 sensors with two of them outputting on the same wire and the other having it's own output. Sadly....the crank sensor won't allow you to upgrade to the Z31 system because it requires a longer duration on one of the 120 degree peaks to identify cylinder #1. Quote Link to comment Share on other sites More sharing options...
VinhZXT Posted August 6, 2009 Share Posted August 6, 2009 I have an 81 ECU laying around in my garage. Quote Link to comment Share on other sites More sharing options...
zx_drift Posted September 16, 2009 Author Share Posted September 16, 2009 What exactly does the dropping resistor do? Quote Link to comment Share on other sites More sharing options...
BleachZee Posted September 16, 2009 Share Posted September 16, 2009 What exactly does the dropping resistor do? lowers the power going to the injectors. Over time, without them the injectors would burn out prematurely. I think its the OHMs that is changed. Quote Link to comment Share on other sites More sharing options...
RUZN Posted September 17, 2009 Share Posted September 17, 2009 I have a 1981.5 Turbo ECU after I did my 300zxt ECU swap.. I would recommend just doing the swap to 300zxt ECU its soooooo much better! Quote Link to comment Share on other sites More sharing options...
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