Engine choices for a 1995 ST Automatic Options

[{-_-}]

Hi,
First I must say thanks for all the information on this site. I have spent the last few days reading abou tthe wonderful things that can be done to this car.

I am about to purchase a 1995 ST with an automatic transmission. The engine is blown, therefore I would need a new motor. I have read the Feasible Swap thread along with many others. Most discussions focus on swapping the turbo engine, but I am interested in the cheapest route (replace the ST engine) or if possible, the engine from a GT (5S-FE?). Would the GT engine work with the auto transmission? I am guessing that the engine mounts would have to be changed as well. Would I have to make any wiring changes?


Thanks

[Dr_Tweak]

Would the GT engine work with the auto transmission? I am guessing that the engine mounts would have to be changed as well. Would I have to make any wiring changes?

No, yes, yes.

[celicaST]

Would the GT engine work with the auto transmission? I am guessing that the engine mounts would have to be changed as well. Would I have to make any wiring changes?

No, yes, yes.
[right][snapback]319846[/snapback][/right]

nothing like an answer that gets to the point like that

[Cutrara]

The car you're about to buy has an "A" series tranny, because it has a 7A-FE engine. If you want to go to a 5S-FE, you need the engine, transmission and motor mounts not to mention the assload of wiring you have to do with any swap, at that point you'd be better off going with a 3S-GTE, but you'd still need to change your transmission and motor mounts because it's an "S" series engine.

If you want to keep your stock auto tranny, I'd suggest a newer 7A-FE or a 4A-GE which is a 20 valve, or a 4A-GZE which is the supercharged MKI MR2 engine. All 3 of these engines are "A" series so they will drop in and use your stock auto, but of course there is still a lot of wiring problems you have to deal with. Like I said, a newer 7A-FE would be much more simple.

Edit: Mad spelling errors.

This post has been edited by Cutrara: Aug 3, 2005 - 10:30 AM

[Akimbo]

It's a waste of money to convert a ST to a GT for a gain of what, 20-30 horsepower. Just get another 7AFE and turbo it. That's the most obvious answer you'll get here. And probably the easiest thing to do for cheap.

[celicaST]

The car you're about to buy has an "A" series tranny, because it has a 7A-FE engine. If you want to go to a 5S-FE, you need the engine, transmission and motor mounts not to mention the assload of wiring you have to do with any swap, at that point you'd be better off going with a 3S-GTE, but you'd still need to change your transmission and motor mounts because it's an "S" series engine.

If you want to keep your stock auto tranny, I'd suggest a newer 7A-FE or a 4A-GE which is a 20 valve, or a 4A-GZE which is the supercharged MKI MR2 engine. All 3 of these engines are "A" series so they will drop in and use your stock auto, but of course there is still a lot of wiring problems you have to deal with. Like I said, a newer 7A-FE would be much more simple.

Edit: Mad spelling errors.
[right][snapback]319922[/snapback][/right]

correct me if im wrong, but i believe i remember reading at one point that the 4agze would not bolt up to the stock auto a246e transmission due to the flywheel being to large.

[Cutrara]

My mistake, I forgot about the flywheel issues. Sorry for any mis-information.

[zipstrips]

i have 2 7a's for sale, pm me if u need it

[purplegt4]

the 4age would bolt up to a ST m/t right?

[Kwanza26]

correct me if im wrong, but i believe i remember reading at one point that the 4agze would not bolt up to the stock auto a246e transmission due to the flywheel being to large.
[right][snapback]320044[/snapback][/right]

A246 is an auto tranny, which doesn't use a flywheel... so it could technically work... I also believe there were A/T versions of the 4AGZE... You'd just need an 8 bolt A series flexplate.

You are correct about the 4AGZE flywheel being much larger than the the 7AFE/4AGE. The 4AGZE fly is built for the E51/E53 trans, which are much larger and beefier. The stock 4AGZE flywheel will not clear the bellhousing in the C50/52/56/C160 trans...

[Kwanza26]

the 4age would bolt up to a ST m/t right?
[right][snapback]325559[/snapback][/right]

Yes. From the factory, both the 4AGE and 7AFE use the same tranny... only with different gearing.