tranny swap AT to MT

[joshuahartman1]

I have a 2.0 I4 1991 Eclipse GSX with a 16g turbo and and automatic transmission that i wuld like to swap out for a manual transmission because my OD slips and also i like MT alot bertter but i need to know what tranny will fit in it by year and ### make and models i can take a tranny off of and swap into mine

 

[kanusky1990]

I would personally try to match year, and model to what you currently have... less chances of needing other things, or stuff not working right.

 

[DSM1G90]

1990-94 GSX used the W5M33 tranny being the AWD tranny. Many have been converted from AT to MT.

 

[Snot Rocket]

I might be wrong but don't you have to change the rear diff when you change to manual? Or was that just in the 2g's?
By the way the OD slipping is usually a easy fix. Your end clutch pack is bad. You don't even have to pull the trans to change them.

 

[steve]

On a AWD you'll have to swap the trans, transfercase, and rear diff to change transmission types because of the difference in gear ratios.

You'll also have to make sure that the transfer case matches the transmission since there are differences in the spline count between the 90 and 91+.

The front axle diameter changed in 93 and the transmission has to match the axles.

The rear diff and rear axles changed in mid 92 to a stronger version called the 4 bolt, if you get one you'll also need the axles and hub flanges for the rear wheels.

 

[kccombs]

Injectors as well are different. Ecu.

 

[steve]

Injectors as well are different. Ecu.

If he isn't changing anything on the engine as part of the swap this doesn't matter.
There's a lot more different between the automatic and manual turbo engines but won't matter for just a drivetrain swap.

 

[kennyg]

If he isn't changing anything on the engine as part of the swap this doesn't matter.
There's a lot more different between the automatic and manual turbo engines but won't matter for just a drivetrain swap.

I'm curious about that too, as I was planning on doing the swap in the spring. Are the maps for the auto's and manuals different or are they just adjusted for the different injectors/fuel pressure?

 

[DSM1G90]

Auto's had the 390cc injectors with the ECU to match.

One increases the injector size, you're gonna have to do some ECU management to match - to a manual ECU, or some other management program so your A/F ratios are in check.

 

[IceMinion]

With the amount of work involved with swapping from AT to MT, I would highly recommend against doing this. Many of the DSM crowd actually are switching back to automatic because it can yield faster quarter mile times and helps spool big turbos. your car is rare and awesome, don't fix what isn't broke.

The automatic transmission in the AWD DSM is extremely strong and durable. Why don't you just try fixing it first.

And lets say you are still unhappy with a perfectly working automatic DSM, you will then be able to sell the transmission in 100% working order.

Ask questions, fixing your transmission is maybe an hour or two of work, doing the AWD AT to AWD MT swap is extremely difficult, expensive, and time consuming and if you read around there are a lot of people having difficulties with shifting their MT cars. The grass is the same color over here dude.

 

[Bud92gsx]

Lets get it straight about auto's and injectors..

1g auto's came with 390cc injectors as well as 42ish psi fuel pressure, and an auto ecu..

Manual 1g's have 450cc injectors and lower fuel pressure(38ish), as well as a manual ecu....

You can swap in a manual ecu, 450's, and manual fpr on an auto..Or along with the 5spd swap do the fuel and ecu too..


Ohh and 1g auto's and manuals came with different cams turbo's, and manifolds...

2g's are different..But this is not the place for that..

On a separate note..A 91 auto would be sweet..I wish I had one...

 

[bryanwheat]

With the amount of work involved with swapping from AT to MT, I would highly recommend against doing this. Many of the DSM crowd actually are switching back to automatic because it can yield faster quarter mile times and helps spool big turbos. your car is rare and awesome, don't fix what isn't broke.

The automatic transmission in the AWD DSM is extremely strong and durable. Why don't you just try fixing it first.

And lets say you are still unhappy with a perfectly working automatic DSM, you will then be able to sell the transmission in 100% working order.

Ask questions, fixing your transmission is maybe an hour or two of work, doing the AWD AT to AWD MT swap is extremely difficult, expensive, and time consuming and if you read around there are a lot of people having difficulties with shifting their MT cars. The grass is the same color over here dude.

It isn't a complicated swap at all. The only custom work that you have to do is cut the holes in the firewall for the clutch master and shifter cables. Everything else bolts right in no problem. It literally takes an hour or 2 to cut the holes out and bolt in the clutch/brake pedal assembly, clutch master, shifter assembly and cables. From there it is just swapping in the transmission, flywheel, clutch, mounts, transfer case and rear differential. IF you are a decent mechanic and not lazy than you can easily have it done in a weekend.

 

[steve]

Are the maps for the auto's and manuals different or are they just adjusted for the different injectors/fuel pressure?

The actual fuel and timing maps are different due to the difference in turbo, cams and the way an ATX loads the engine. The different injectors/fuel pressure is accounted for in the injector global and injector deadtime map.

 

[brian9397gsx]

Im looking for an auto trans for my 91 pm me if your done with it, I also have alot of manual trans stuff let me know.

 

[FLASH1970]

I say leave it auto... but here's a couple articles to get you going. I know they are for a 2g, but there's not much difference. Also, the search feature on this board will give you a lot of info.

http://www.dsmtuners.com/forums/articles-drivetrain/266084-complete-awd-auto-5speed-conversion.html

http://www.dsmtuners.com/forums/art...g-awd-automatic-manual-transmission-swap.html

http://www.dsmtuners.com/forums/articles-drivetrain/152632-awd-automatic-manual-swap.html