DIY ECU tuning for Motronic 4.4 (pre-99 X70s)

clinton · 2015-03-20T23:33:45+00:00

PS, dont tell my wife that I was working on the dinner table when she was out...

nickm

Disconnect the climate control and flash in the car?

clinton

Unfortunately, I have no experience with 4.3 ECUs. But with a flashed 4.4 ECU (which may be the same), it is initially set up in logging mode, which blocks normal OBD2 communication. You have to send a special character (‘o’ I think) to turn logging mode off. Maybe something to look into?

When I was starting our, I used RealTerm heaps to verify connectivity, and it was very helpful.

Sorry James, I have never worked on an 4.3 to 4.4 conversion. Maybe @Jackson can chime in?

jamesinc

nickm;75699 wroteDisconnect the climate control and flash in the car?

That is an obscenely sensible solution. Embarrassed I didn't think to do that myself.

Jackson

My AC doesn't work anyway, so I can't remember if I took any precautions with the first flash.

Raebird

Does anyone have an install guide/link for installing the wideband using the tank pressure signal wire? Can't seem to find it after many attempts searching for it...

Ghettobird

Yes, Ive done it
Ill have some info up in a few days
https://ozvolvo.org/discussion/3050/julians-850r/p8

Here I wired up a MAP sensor to use the tank pressure pins and I have since wired in my Ecotrons wideband to use the 2nd narrowband pins in the ECU, but will be switching them around soon

Ghettobird

Here are the Pinouts for M4.4

850AWD

Help...
https://ozvolvo.org/discussion/9305/m4-4-odb2-communication#latest

TurboS70T5

Hello all,
Ive been very interested in beginning the journey to tune my 98 T5. I am currently attempting to set up the TunerPro RT following the Wiki M44 page steps. I am stuck at the Flash Plugin step. It states to insert 2 files in the PLUGIN download into the tuner pro root folder. However when I use the link it directs me to DropBox but it only shows me a single downloadable file. a .RAR file. Is that an updated file to replace the 2 it describes needed? Or can someone supply me with the files that they used to make Flashing possible. Thank you Sorry to be behind the times. I hope this is still an active forum. Thank you for your time

850AWD

.rar is a compressed file, download winrar program... What engine you have?

Ghettobird

Download and unzip the file using winrar or winzip.

jamesinc

TurboS70T5;143856 wroteI hope this is still an active forum.

Me too!

TurboS70T5

850AWD;c-143857 wrote.rar is a compressed file, download winrar program... What engine you have?

It’s a 98 s70 t5. Stock motor 19t , even on 13-14psi it seems to max out the stock maf about 4K and up. AFR peg 10.0 with blue injectors . With a stock r tune from Vast . So I ordered the self tune ecm set up to make some small changes to start.

Rob

TurboS70T5;c-143886 wrote
850AWD;c-143857 wrote.rar is a compressed file, download winrar program... What engine you have?
It’s a 98 s70 t5. Stock motor 19t , even on 13-14psi it seems to max out the stock maf about 4K and up. AFR peg 10.0 with blue injectors . With a stock r tune from Vast . So I ordered the self tune ecm set up to make some small changes to start.

That is correct, a stock motor will max out the MAF even with the slightest boost increase. Suggest upgrading to a bigger MAF.

850AWD

BMW MAF with 3.5 inch housing seems to be the standard upgrade. But ecu needs adjustment...

Ghettobird

Any maf swap needs adjustment

Ive got the e39 540 housing in mine and it runs great after the tune was fixed

Rob

Ghettobird;c-143923 wroteAny maf swap needs adjustment

Ive got the e39 540 housing in mine and it runs great after the tune was fixed

That is what i have. No maxing out.

850AWD

https://ozvolvo.org/discussion/3050/julians-850r

TurboS70T5

So I have sourced a bmw maf. Wednesday I should receive my ecm from VAST with an ostrich set up. Does anyone on here share or upload tunes to discuss or anything? Or is that one of those forbidden secret type things?

Ex850R

@Ghettobird, Julian has the secrets, also has post about the process he went through etc.
A great resource.

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