Originally Posted by scott@upsolute
There are a few issues you'll have to face:
1. connect between PC and ECU ("easy" part)
2. finding/reading/writing the mapped data
3. interpreting/scaling the maps
4. re-writing the maps
5. finding/correcting all of the checksums
There are various vendors who make a product for each issue, but yes the tools are not cheap.
You may have luck in finding/changing the adaptation channels although these are less useful. The is a freeware tool called "lemmiwinks" (beware you'll get some interesting south-park references if you google this) that some of the VAG guys use to tinker with stuff. Not even sure if this stuff resides in the revision of ECU used in the crossfire though.
Have you considered a piggyback setup like the SMT-6? Might do what you want (MAF scaling, timing control)
Exactly right Scott, I didn't say it would be easy.
I have been hunting around the open source scene for quite a while but
have alot of the dev tools for decompiling hex files etc so apart from the amount of time involved am not too phased by that prospect.
Yes, I have looked at piggyback systems and complete replacements like the open source Megasquirt project. I just figured that the high degree of systems integration on this vehicle may be cause problems if replaced in isolation.
How similar are the various Montronic ECU's? Obviously the maps, if not the programme code itself are all vehicle specific, but could I just get another ME2.8 (I think it is) from a more common vehicle to experiment on, as finding a cheap Crossfire or SLK ECU doesn't seem very likely.
Re. your posted graphs. Excellent! that is just the sort of think I want to log on the Crossfire and is my next step. Thanks for the link to VAG-COM but I have all the hardware/software sorted for this now (ELM/OBDlogger), I just need to get on and do it. Isn't VAG-COM exclusively for VAG vehicles as I know they use some slight variations on the ISO standard OBD spec.?
Its great to get some dialogue going on this stuff and it looks like we are finally going to start seeing hard data and figures appearing for this car; there has been plenty of talk but, dare I say, very little in the way of action.
Simon.