Looking into the combustion chamber

Mike W. · Post by **Mike W.** » Wed Apr 11, 2012 9:53 pm

It's not chipped is it? You know, Murphys law would be that you would get the only chipped ECU in the yard when you didn't want it. Carbon can build up fast, in just a few thousand miles, but not all that heavy. Have you tried different brands of gas? Even with the same number some react differently than others.

Blaise · Post by **Blaise** » Thu Apr 12, 2012 12:08 pm

Mike W. wrote:It's not chipped is it? You know, Murphys law would be that you would get the only chipped ECU in the yard when you didn't want it. Carbon can build up fast, in just a few thousand miles, but not all that heavy. Have you tried different brands of gas? Even with the same number some react differently than others.

I do try all sorts of gas stations and I have not noticed a difference.

I am running a stock 179 BMW ECU, without a chip. I have a spare that I opened, but I don't see any adjustability in there (some had switches).

Seems that it would be ideal to richen my mixture a bit at WOT and retard the timing a hair. Not exactly sure how one does that in my situation.

Falkenberg · Post by **Falkenberg** » Fri Apr 13, 2012 2:30 am

I don't think you can't do anything in a nice way, except fooling the lambda (if you have it) and moving the ignition hall sensor a bit.
The better solution would be a custom firmware (chip).

wkohler · Post by **wkohler** » Fri Apr 13, 2012 4:23 pm

I wonder if you should look for a 150 ECU. They were used in the early B35 cars with Motronic 1.1. The 150 ECU still has a fuel quality switch and that might help you retard the timing a bit or add more fuel.