Which TCU would you choose?

[idosubaru]

Been driving this car for awhile and I should finally have time to swap a closer matching TCU into this 96 Legacy project car. It is a 96 Legacy EJ18 FWD automatic.

 

I have two options for FWD TCU's:

 

Match the engine - by getting a FWD TCU from an EJ18 powered impreza.

 

Match the body style - by getting a FWD TCU from an EJ22 Legacy.

 

Which is better - match the body style even though I can't match the engine which has lower output? Or match the engine size even though I can't match the body style (weight differences)?

 

I'm leaning towards trying an Impreza EJ18 TCU since it'll more closely match the engine output. But I'm not sure how interchangeable EJ18 stuff is since they are a good bit different electronically and all. Guess I'll end up trying both.

Edited June 9, 2009 by grossgary

[4x4_Welder]

What's in it now, and what's not right about it?

I was under the impression that aside from the 2nd hold vs 1st hold, the computers were all about the same.

[idosubaru]

The shifting just doesn't seem to be what it should be. Mainly it won't downshift sometimes when it should. It'll shift fine manually and sometimes I just downshift for it manually since it waits too long.

[ericem]

Maybe you have a TPS sensor issue. Might need to be readjusted.

[idosubaru]

  ericem said:

Maybe you have a TPS sensor issue. Might need to be readjusted.

hmm, really?

should be easy enough to check at least...if the FSM isn't completely dead wrong like it is for the XT6!!!!:-\