Just curious...Is a stock ECU fuel map the same for both front and rear cylinders......for instance a Power commander has the " basic " map ' both cyls same fuel value' then theres the advanced map....' different values for each cyl'.... for the particular intake and exhaust combo..wondering if Harley sets up the "basic" map or "advanced" map..

 

i know nothing about engines, and i know nothing about ECU mapping, but I assume that changing each cylinder might be used because they don't fire at the same time like they do on cars

 

Wow!!

 

I'm with you there.

 

Yeah, Me too!

 

Each cylinder is tuned independantly from Harley (stock). Power Commanders still uses the stock MAP (except the PC Vision), if you have your PC MAP set to all zeros, it would be running the stock MAP, any positive number in the would be adding fuel and any negative number would be taking away fuel, since both cylinders were set up (tuned) and your performance upgrades effect both cylinders, most users are safe to make adjustments in Basic mode, but the tune would be alot better if each cylinder was tuned independantly. The early versions of the Power Commander didn't have advanced mode, both cylinders were always tuned together.

 

Though the popular tuning devices can't display the stock ECM map, the SERT, SEPST, and TTS Mastertune replacement calibrations use a common AFR Table with individual VE's for each cylinder: