Converting from a 1G to 2G ECU/Harness

[ViperZ]

After having so many issues with 1G electronics, I've decided to switch over to a 94/95 setup. I know I will be needing the 2G ECU and engine harness but will I also need the body harness? I'm currently running a TT conversion setup and have a 92' TT body harness laying around, would that work? I'll be hooking it up to work with the CAS instead of switching over to both the crank and cam sensors on the 93+ models. Is there anything else that will need to be modified/replaced? Any help will be much appreciated!

-Aaron

[lawdogg]

Aaron, you don't need to do any of that. The most you'll have to do is mess with your CAS sensor wiring to account for the sensor latency difference.

The 3 plugs to the 1g ecu plug right into the 94/95 ecu. You'll have to run one wire to the 4th plug location. Check out this post:

http://www.3sgto.org/f13/diy-94-97-9...html#post71586

And the supporting stuff:

http://www.plxdevices.com/ECUDatabas...thTT_91_97.pdf

Stealth 316 - CAS Conversion

[ViperZ]

Really? That's alot easier than I thought it would be. Thanks!

[lawdogg]

Yeah man I was shocked too. I plugged my 94 ECU into my 92, jumping that one wire to the new pin, and it fired right up. I think the only issue is going to be the timing advance from the sensor latency - if I start to push it - but I'm planning on swapping in my 94 engine so I'm hoping it will be a non-issue at that point. If you are going to keep your engine and that ECU, though, and push your tune, I think you might need to find a way to tune the timing advance out.

[ViperZ]

That shouldn't be a problem. I can always switch over to the 2G crank and cam sensors if needed. I'll be running a pretty basic tune for this summer. What did you do about your diagnostic port? I definitely want to run a datalogging setup. I was running MMCd on the 1G ECU

[lawdogg]

I haven't figured that part out yet - I think that you just have to wire in an OBDII com port, but I'm not sure where to get one or how to wire it in. Probably will wind up being a 'learning by doing' type deal when i get there lol.