If it came with an ECU that'd be the one you want to run. Otherwise swap over the EGR components and wire up the VSV... I don't think the harness needs to be completely swapped, but I don't have a wiring diagram for the JDM. I think you just need to run the one VSV signal wire and then you may get the positive for the other pin at the fuel pump resistor relay (brown wire with red stripe).
This is more of a longevity issue... if anything. In cooler climate areas or high altitude I can't say I'd worry about it. Somewhere like California, Florida, Arizona... I'd do everything I could to make sure that engine is running nice and cool and safe from detonation. You really may be just fine pulling 5? or so off the base timing, I'm not sure I haven't been through this... I'm going off the theory of the thing.
With the check engine light, there are no codes getting stored? Does your ECU have power at the BATT pin when the ignition is turned off? Put the diagnostic jumper in and driver the car. For as long as it usually takes for the check engine light to come on. It'll start blinking a code as you drive, you'll get at least a code 51, that one you may ignore. Now pull over periodically and see if there are any other codes. I'm thinking you're going to see either a code 52 or some code(s) related to the AFM.
Quote:
Originally Posted by supraheelfan
I think I missed something. What are you guys talking about? So the o2 sensor will take away half of my power? That's what is happening to my car. I have a 87 N/A mk3 and I'm parting it out. Let me know if there is something you need.
I'm also in the process of getting a rack and pinion, I was looking at the one from Beck Arnley, is that a quality product? Is there a better choice, should I just rebuild or buy another one?
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I have no idea what he means about the O2 sensor... and NO, it will not affect your power like this. You can simply unplug the O2 sensor on these cars and you should see no difference. If the signal is missing or too far out of range (more than 200mV +/- 600mV) and the ECU will just ignore it and use the same base maps it uses when the car is started cold. On 89+ you'll get an O2 sensor heater circuit code along with the O2 sensor code but it doesn't do a thing.