The Old 850 T5 to T5-R ECU swapping saga....

[Flynny73]

Hi Guys
I know that topics similar to this have been discussed quite a few times on many Volvo forums and I am aware that certain ECUs can be swapped without any problems and some can't. I have a 1995 T5, ECU number 261 200 549 and I have an ECU from a 1995 T5-R Auto, number 261 204 134 which has an Autotech chip (allegedly 300hp...but I doubt it will actually make that power with just a K&N filter!!). I know that this ECU will not run in my car, I tried it anyway and it does the turn over, fire and then immediately cut out trick.
My questions are, is there any way to make it work in my car?
If not, then if I remove the chip from the board and put it in my original ECU will that work and give me the extra power???

Many thanks in advance for any help you might be able to give.
Cheers
Matt

[PNuT]

Possibly sounds more trouble than it is worth?

Is your car manual or auto?

[Flynny73]

Mine is manual, but my research suggests that Auto ECUs work in manuals but obviously not the other way round

[PNuT]

You can but it wont be quite right....

I do have a modified ecu for an auto that I was running in my manual kicking about in my garage

[Flynny73]

Hmmm, what will be wrong with it then??

Do you know the ECU number for that one and when you say modified....??? :-)

Thanks

[PNuT]

Originally Posted by Flynny73

Hmmm, what will be wrong with it then??

Do you know the ECU number for that one and when you say modified....??? :-)

Thanks

The revs do odd things between gears....

I would have to hunt down my ecu but it has been modded to run an 18T with more boost & blue injectors...