Is Harness/Ecu on Eta engine???

[darvo]

I have an early 325e that I will convert to I on some time. I have a spare 2.7 block to make a stroker I.

I just bought and have a Custom Motronic with Ms3 board, Is wiring harness and crank wheel.

Can I use this on my Full Eta engine and program it. Until I complete the "IS" Stroker engine for turbo?

[TurboJake]

No. You will need to swap over all of the I parts and complete the stroker build to run it. The harness connectors at the ECU are very different between the ETA and I DME's

027 DME


153/173/380 etc (M1.1 and M1.3) DME

[darvo]

My complete harness, Ecu and Crank wheel are from an "IS" car.

What other connector changes?

[MR 325]

You can run it, sure. Set the rev limiter low (5000) and you'll be fine.

You'll need to swap the i ICV setup on there though.

[darvo]

So im better off swaping the IM as well?

[nando]

since it's MS3, it doesn't care what type of motor you have. it'll run basically anything, but with the eta the only caveat is the 120-tooth flywheel sensor isn't supported, you'll definitely need the 60-2 wheel and sensor from an M20b25. which you've already got.

MS3 will also run the eta's ICV but if you've already got the I stuff, use it, it's better. as far as the intake manifold - it doesn't really matter.

[darvo]

Thnks for the reply! I just dont want to wait until I refresh the stroker I... To use the Ms3, So I should set a really low rev limiter? 5k to 5,4?

[nando]

set it to what the eta can handle, so yes.

[MR 325]

since it's MS3, it doesn't care what type of motor you have. it'll run basically anything, but with the eta the only caveat is the 120-tooth flywheel sensor isn't supported, you'll definitely need the 60-2 wheel and sensor from an M20b25. which you've already got.

MS3 will also run the eta's ICV but if you've already got the I stuff, use it, it's better. as far as the intake manifold - it doesn't really matter.

But he mentioned the MS is built in to a Motronic case so most likely it's a PnP kind of setup which means he's going to want to use the i harness with it. This means he'll want the i ICV since it will plug in!

[nando]

it's MS3. not exactly the same as an MS2 pnp. no extra hardware needed for an ICV (2 or 3 wire). I'm not saying he shouldn't use the "i" ICV, I'm just saying MS3 doesn't really care.

I don't know why you'd build an MS3 PnP for a 55 pin harness anway. you wouldn't be able to do sequential injector or COP, the biggest benefits of MS3..