At To Mt

Jacek · 12-13-2003

hey guys, im going be helping my friend do an AT to MT swap and was wondering what is needed for everything.
also the car doing the swap as a 92 6bolt but the car that the tranny is comming from is a 90. will this work out just fine or not?

12-14-2003

i just read something about the 90's shift cables were a little different in length than the rest of the years. don't remember if they were shorter or longer. better check on that.

- if the car is a AT right now, just use all the linkage parts from the 90 mt and you should be fine.

MATCHBX · 12-14-2003

Don't forget about the ecu also. If I remember correctly the ecu's between a MT and an AT are different.

MustGoFaster · 12-14-2003

The rear diff has a diffrent ratio as well.

AJ · 12-14-2003

http://www.ecanfix.com/%7Emdhamilton/autotomanual.html

**JET** · 12-14-2003

ECU's between an MT and AT for a 1g are the same, but the 90 ECU is different. I would use the 92 ECU and TB with 90 shifter cables.

MATCHBX · 12-14-2003

I thought they had different fuel curves. The AT's actually have a switch on the center console to change the fuel map (or am I mistaken).

Is the auto tranny controlled by the ecu? If it is then the ecu's would be different, unless the ecu can determine the tranny type and change how it works. I don't know if this is true or not so if I'm wrong, someone please correct me.

--Edit--

Did a little research and found the switch to change shifting points. Also the auto ecu is set for smaller injectors as the manual is set up for larger injectors.

Jacek · 12-14-2003

is the harness any different, i guess the turbos are, how about the cams?

MATCHBX · 12-14-2003

Cams and injectors are both different. AT cams are good for low-end power while MT ones are good for high-end power.

Jakey · 12-14-2003

I believe the '90 harness is different than the '91-94 harness. Nash was talking about it in this thread: http://www.dsmstyle.com/forum/index.php?showtopic=698

**JET** · 12-14-2003

The auto is set up for 360cc injectors vs 450's of the manual's. He isn't changing the engine, so that is a mute point. The ECU that controls the tranny is seperate from the ECU that controls the engine. The engine ECU's can be interchanged, although there are a few small differences. No biggie if you have a SAFC.

MATCHBX · 12-14-2003

Yeah I read that a little while ago about the tranny computer and the engine computer being separate. DSMtalk has some good archives on it.