Motronic 4.3 to 4.4 Topic is solved

[SUENTO]

I'm fairly new to Volvos and modifying car electronics in general, but I was wondering if I would be able to swap from a 4.3 to a 4.4 since my 850 is a 2.0L T5 (B5204T) from Italy. So basically I'd have to get the ecu from a proper 2.3L T5, would that cause major problems/would the car even start? What kind of modifications would I need to do to get it working?

[Chuck W]

Make your way to THIS THREAD HERE

In theory, yes you should be able to convert, but it's not going to be a drop-in, most likely.

You can start with a 98MY M4.4 ECU and then modify it to suit the 2.0T. I know there are some sample bin files in the Motronic Suite for the 2.0T's that would give a good starting point.

If you're not up to doing your own tuning and flashing an ECU, this may not be a project you would want to pursue, however.

[SUENTO]

Make your way to THIS THREAD HERE

In theory, yes you should be able to convert, but it's not going to be a drop-in, most likely.

You can start with a 98MY M4.4 ECU and then modify it to suit the 2.0T. I know there are some sample bin files in the Motronic Suite for the 2.0T's that would give a good starting point.

If you're not up to doing your own tuning and flashing an ECU, this may not be a project you would want to pursue, however.

I'd love to learn to tune/flash ECUs, it's just really confusing at first and from what I've heard tuning the 4.3 isn't worth it.
Thanks for the reply and the link

[Chuck W]

The first link is just to the M4.4 thread here.

The M4.4 Wiki page has a bunch of other info as well.