Join Date: Apr 2012
Location: Rock Springs, WY
Changed Thundermax Mapping and mileage increased
After reading quite a bit about the Thundermax, I decided to make some changes to my Thundermax map #345. In the stock map, some AFR ratios were around 2.8, while at cruise they were in the mid to upper 13's. This gave me horrible mileage, somewhere in the 20 mpg range. After reading quite a bit, I decided to change the curves at every rpm and raised the whole curves. Most of my cruising AFR's are in the 14.1-14.2 range with the rest of the curve in the lost 13.2's to 13.3's. This has made a dramatic improvement up to around 39 mpg. Bike seems to be running great. Does not seem to have any excessive heat, no knock or pinging. My bike is a 2009 SERG with a 110 motor, stock cams, Vance & Hines Power dual head pipe, V & H Hi Output mufflers, Screamin Eagle High Flow air cleaner. I have checked the plugs and they are mostly brown with a slight white possible at the tip. Do you think this is going to be OK? I do not want to lean it out too much.