Quote:
Originally Posted by rwest
Thanks Mike,
It would be so nice to have the brain close to the engine for shorter wiring etc (you would eliminate a connector). I may get a temperature data logger to see how hot it gets on the side during and after running and in the sun.
I’m still troubleshooting, but will likely get a hold of you for more info.
Best,
Rutager
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If you're picking up a new ECU, you can usually opt for a flying lead harness instead of building one from scratch. The ECU-side wires come pre-terminated with connectors, which is what I went with for my Haltech R3. I considered using a bulkhead connector to route everything into the engine bay, but ended up feeding the harness through the same spot where the old O2 sensor bundle used to run. After watching a bunch of Haltech wiring videos, I noticed most builds passed the harness straight through the bulkhead—so I followed suit. I got the harness installed with the engine and transmission out of the car. It would have been a struggle otherwise.
The only wires I had to extend were for the ignition and injectors on the driver's side. Not a big deal.