94 GS ecu/ 94-95 ecu swap

[w/oarctic7g]

First of all great website! I have learned a lot in the many days and hours I have searched this site. Did the tb upgrade, thanks posters. I have found some pin out info but not everything yet. The question is; What if anything needs to be changed to run a 94 GS 5 speed computer in a 94/95 sohc 7g auto? Both models have 3 plugs at ecu, and 2 plugs at obdII location also both have high impedance injectors. Coil packs swap necessary?

[w/oarctic7g]

Anybody have insight on this one?

[mko]

yes. the easiest way is to swap harnesses or add pins/Wires to the harness for the coil packs/transistor and knock sensor

Also there is a difference in the pinout for pin 82 I think. For Sohc it goes to ground and for Dohc it goes to +12V

















http://www.4shared.com/photo/Ln2m1s9...antSOHCp2.html

[w/oarctic7g]

Thank you I will study it for a few days before I commit. It appears I might be able to use the IAC wires engine side for coil packs(it runs much better disconnected after the tb swap). I have a 1g n/a complete core engine. Is knock sensor needed since no turbo?
FYI- Mazda B2600 injectors(326cc) work well in my na setup.

[peanotation]

whoa, mazda injectors? haha....wow. gonna have to look into those. did you have to compensate for the extra fuel coming in? i'd imagine it would run a little rich

[w/oarctic7g]

The 550 rx7 injectors were too much lots of black smoke and loaded up couldn't rev over 3500rpm. The B2600 injectors are 326cc and work pretty well for me but I am 100% off road and 95% of the time wide open throttle. I have no plumes of black and sparkplugs are consistently med/dark brown(the stock ones were almost white way too lean for me) . If you decide to use them you will need the connectors as well but other than that its plug n play.

[w/oarctic7g]

I don't think there is a pin 82 on a 3 plug harness. Not sure that I have a mount hole for the knock sensor. I have concluded it is not as simple as it looked at first. It appears I have to run new wires 23,31,38 and 58 to gs ecu. Most other pins seem to match up but I still need to find pinout values on 1g and pinout specs on 1g, gs, & 94-95 7g coil, transistors, cam, crank, and distributor signals. All this studying is making my head hurt. Has anyone tried this before? I usually don't mind a little trial and error but don't really want to fry a rare gs computer.

[mko]

sorry, theres difference in the wiring of pin 26 and 38

[w/oarctic7g]

are you saying there are too many differences and I shouldn't try it? I studied 26 for quite awhile appears to be ground wire that grounds a few more places is all. According to the diagrams 38 isn't used on the 94-95 sohc.

[peanotation]

The 550 rx7 injectors were too much lots of black smoke and loaded up couldn't rev over 3500rpm. The B2600 injectors are 326cc and work pretty well for me but I am 100% off road and 95% of the time wide open throttle. I have no plumes of black and sparkplugs are consistently med/dark brown(the stock ones were almost white way too lean for me) . If you decide to use them you will need the connectors as well but other than that its plug n play.

i know EXACTLY what you're talking about. i'm running 100% stock car right now and hte plugs get too white for my taste....not completely white, but they still don't look like that nice med/dark brown.... thx for this