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I was looking into installing somebody's aftermarket fuel tuner, too. I wrote to Cobra, since they seem to make the most reasonably priced one, and they told me that theirs, and indeed, everyone else's just ADD FUEL to the existing map. I looked at the power commander fuel maps and the rpm range they address, and the area I need to tweak is not accessible by anybody due to emission control rules. If you download and install the zero map, that is the basic factory setting, and it makes a power commander a pretty expensive piece of cargo. Any other map will just add fuel above 3000 rpm. Not much of a help. By pulling out the baffles, you decreased back pressure and noise level, and increased air flow through the engine, thereby lowering intake manifold vacuum. The higher the manifold vacuum, the efficiently and economically it runs. The MAP sensor sends signals back to the computer that tell it what kind of load it's experiencing. The heavier the load, the lower the vacuum, the richer it runs.  I just got back from a 400 mile one day ride, and keeping speeds to about 62 mph, I got 42. something MPG. My speedo is off exactly 2 mph over the whole range, so 62=60 real world mph. Just no way to really "re-jet" fuel injection....

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Posted by plevine1

- June 06, 2011, 13:16:01 PM

My 99 Drifter has a PowerCommander III along with Vance & Hines Longshots with a Kuryackn Hypercharger. I bought the bike this way. The bike never really got great gas mileage and since I pulled the baffles it has gotten worse. The PowerCommander website has a map for my bike but with a stock intake.
Would I need to make a change to this map to allow for the hypercharger or is the baffle removal more of an impact?
I must assume that once I download the new map my fuel consumption will improve. I also have occasional backfire. This I dont know if a download will fix. I know that fuel can be adjusted for each range directly on the powercommander but not sure what adjustments to make.

Thoughts?

Thanks

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