[BMW Atlanta]

Originally Posted by shreddr

The chip in the motronic which has a number of replacement options (BBPower, Laser, custom burned) is an EPROM (erasable programable read only memory) chip. If they are erasable and reprogrammable, why can't you pull your stock chip and have it remapped to the values you need for your modifications? Secondly, regarding the cat code plug which as far as I can tell selects the map on the EPROM to use, I have read here that the R1100S EPROM has no difference in any cat code setting because all 8 maps on the chip are identical. If this is the case, then where does the "default" richer map come from when the O2 sensor is pulled? I did find a reasonable explanation of the Motronic on the IBMWR, here it is:

http://www.ibmwr.org/r-tech/oilheads/R11inj-surging-fixes.shtml

Lastly, if the cat code plugs differentiate between 8 programs, and the R1100S has 8 identical maps, it seems that you ought to be able to have a modified program, written alongside the stocker, and select between them like the cat code plugs works for the BBPower unit.

Any takers on this one?

When you buy a chip, you are not paying for the chip as much as you are the tuning, distribution and retail of it. In theory the stock chip could be re-mapped, but you'll be hunting to find someone capable of re-writing the codes necessary and then have dyno tuning time which would equate to $750-1000 as a rough guess assuming the chip's memory is re-writeable. So yes it could be done, but more drama then its worth to accomplish.