Auto 2.5 M20 --> manual ETA swap

[Track89]

Just picked up a E and a buddy has a m20 laying around but it's a auto. As far as pressure plate, clutch etc.. What would I need to make this swap doable in a weekend??

[mark_i]

swap the crank spigot bearing and fit a decent ratio differential: 3.74 or 3.91.
b25 like to rev...

[Track89]

Nice, can I make do with the stock E diff?

[mark_i]

you can. but dont expect rapid acceleration.

Here in Australia, 325e was imported with a 2.93 diff, great for economy and cruising at low revs.

[jlevie]

Assuming the M20B25 is complete with intake manifold & throttle body, you will also need the engine harness, DME and AFM. Depending on what year of car that engine came out of you may need to swap out the water pump.

[Track89]

The motor is fully intact, so the DME is going to replace the full E harness?? The donor is a 89 and the E is a 84. Wouldn't the water pump just go in with the motor?

[jlevie]

There are two water pumps, radiators, and expansion tanks used on M20 power cars. The early variant has the expansion tank mounted on the right fender well and the late variant has the expansion tank mounted on the left fender. Cars built up to 8/87 have the early style. So you will need to change the pump on the 89 engine.

I believe your car has a C104 connector for the DME START input and tach & econometer outputs as a part of the engine harness. The 89 harness routes those through C101. So that will have to be dealt with in the swap. Probably the easiest fix is to scavenge C104 from the E harness and graft it into the 89 harness. The other possible issue is that your car might have the rectangular C101 connector that won't directly mate with the round C101 connector on the 89 harness. Oh yea, make sure that if there is a wire in the body side of C101 pin 20, that you clip it to avoid frying the 89 engine harness.

[Track89]

There are two water pumps, radiators, and expansion tanks used on M20 power cars. The early variant has the expansion tank mounted on the right fender well and the late variant has the expansion tank mounted on the left fender. Cars built up to 8/87 have the early style. So you will need to change the pump on the 89 engine.

I believe your car has a C104 connector for the DME START input and tach & econometer outputs as a part of the engine harness. The 89 harness routes those through C101. So that will have to be dealt with in the swap. Probably the easiest fix is to scavenge C104 from the E harness and graft it into the 89 harness. The other possible issue is that your car might have the rectangular C101 connector that won't directly mate with the round C101 connector on the 89 harness. Oh yea, make sure that if there is a wire in the body side of C101 pin 20, that you clip it to avoid frying the 89 engine harness.

All these plugs and sh!t are blowing my mind.

Would a "i" head with the turbo be easier in the end?? Just source a used mani and turbo? what would the engine management be, the Stock "i" DME?

[jlevie]

All these plugs and sh!t are blowing my mind.

Would a "i" head with the turbo be easier in the end?? Just source a used mani and turbo? what would the engine management be, the Stock "i" DME?

No, because you'd still have to change the intake & throttle body, AFM, engine harness, and DME to those used on an M20B25 engine. And then there's tuning to have to deal with. You might get by with a WAR chip, but the better solution would a a MegaSquirt. Swapping in an M20B25 is much easier.

[Myster-E]

No, because you'd still have to change the intake & throttle body, AFM, engine harness, and DME to those used on an M20B25 engine. And then there's tuning to have to deal with. You might get by with a WAR chip, but the better solution would a a MegaSquirt. Swapping in an M20B25 is much easier.

Finally someone here that also knows whats up. God Bless America!

[Track89]

Finally someone here that also knows whats up. God Bless America!

West coast faggit, tell me why my coolant is leaking out of the cap when it's running for about 1/2 hour. Smart ass faggit