20seh engine ecu...

[A-J]

ive just bought a 20seh engine, loom and all the gubbins to put in my cav, but the guy has "lost" the ecu, but mentioned you can run a 20ne ecu as well? looking on ebay they arnt badly priced, but i want to know which ones will definitely work and if they make any noticeable difference

cheers fellas

[planetc]

Be aware that most 20NE ecu's that you are likely to find are going to be C20NE and looking for an o2 sensor and tank vent valve, I don't recalll the SEH having them, unless someone remembers better. Could use the complete injection system from one though as the guts of the engine are much the same

[A-J]

It's going into an L reg that currently has a 1.8 spi in, so could I use the o2 sensor from that?

[Dieselicious]

Be aware that most 20NE ecu's that you are likely to find are going to be C20NE and looking for an o2 sensor and tank vent valve, I don't recalll the SEH having them, unless someone remembers better. Could use the complete injection system from one though as the guts of the engine are much the same

SEH had higher comp. and a mild cam.

Never fitted with Cat and therefore associated gubbins.

I'd have thought most of the difference in the management was in the slightly higher rev limit.....

[Envoy CDX]

You'll not get the same "umph" from it as they are setup differently assuming the ECU will fit the loom (c20ne had both 2 and 3 row plugs from memory)

Best off getting an SEH ECU (your not restricted to mk3 cav's either, Carltons and MK2 cavaliers and MK2 astras also came with the SEH I beleive

[planetc]

I vaguely remember that they will run on both ecu's, but the C20NE will wind up running in limp mode because it wants an o2 sensor signal. If it were mine I'd be searching for the right ecu, which will be optimised for the engine. Senseless having that little bit extra that the SEH has, and then strangling it with NE mapping for the sake of an ecu.

[Envoy CDX]

I vaguely remember that they will run on both ecu's, but the C20NE will wind up running in limp mode because it wants an o2 sensor signal. If it were mine I'd be searching for the right ecu, which will be optimised for the engine. Senseless having that little bit extra that the SEH has, and then strangling it with NE mapping for the sake of an ecu.

Very true, but if you want to, you can ground out the o2 plug sense and it should ommit that issue (Andy K or Mark T of VXoN covered this )

[planetc]

Very true, but if you want to, you can ground out the o2 plug sense and it should ommit that issue (Andy K or Mark T of VXoN covered this )

and the tank vent valve?

[Dieselicious]

Very true, but if you want to, you can ground out the o2 plug sense and it should ommit that issue (Andy K or Mark T of VXoN covered this )

and the tank vent valve?

Do the 20SEH not have a purge valve?

My 30E does, and that runs Jetronic.

[Envoy CDX]

Very true, but if you want to, you can ground out the o2 plug sense and it should ommit that issue (Andy K or Mark T of VXoN covered this )

and the tank vent valve?

Do the 20SEH not have a purge valve?

My 30E does, and that runs Jetronic.

Tank vent valve? that ickly little black thing on the back of the engine - don't know really
What's a purge valve then?

[Dieselicious]

What's a purge valve then?

Tank vent > Carbon Canister > Purge valve > Inlet manifold

[Envoy CDX]

What's a purge valve then?

Tank vent > Carbon Canister > Purge valve > Inlet manifold

Then yeah, the SEH in the MK3 will most likely have some form of it.

[Envoy CDX]

Could be worth a read: How2 By Andy K

[A-J]

so i have engine, ancilliaries, loom (almost) intact, i'll figure out whats missing as it goes in, and an SEH ecu (when i buy one)

this is all going into a car currently fitted with a c18nz

is there anything else i'm going to need? fuel pump? purge canister(?)?

help much appreciated

[Envoy CDX]

so i have engine, ancilliaries, loom (almost) intact, i'll figure out whats missing as it goes in, and an SEH ecu (when i buy one)

this is all going into a car currently fitted with a c18nz

is there anything else i'm going to need? fuel pump? purge canister(?)?

help much appreciated

you'll need a mpi fuel pump. a 16v pump will do.