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post #1 of 4 (permalink) Old 07-09-2014, 12:26 PM Thread Starter
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Changed Thundermax Mapping and mileage increased

Hello,

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.

Thanks,

1BadGlide
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post #2 of 4 (permalink) Old 07-30-2014, 07:57 PM
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I think 14.1 to 14.2 is fine ~ if the bike is running good with no pinging I don't see a downside.... I have the afr's set in my PCV with AT at 14 at cruise with the S&S 124.

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post #3 of 4 (permalink) Old 07-30-2014, 08:14 PM
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I fail to see the reason "tuners" feel the need to drown the engine in fuel.......and why they think 25mpg is perfectly acceptable. I see way too many bikes that blow black smoke every time the rider cracks the throttle. "Hey bud, it's not a diesel............"

2015 RGU CVO........under continuous change......
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post #4 of 4 (permalink) Old 08-01-2014, 08:52 AM
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Quote:
Originally Posted by tdkkart View Post
I fail to see the reason "tuners" feel the need to drown the engine in fuel.......and why they think 25mpg is perfectly acceptable. I see way too many bikes that blow black smoke every time the rider cracks the throttle. "Hey bud, it's not a diesel............"
Diffidently what he said ^^ ...
I changed to Drago's true duals, PV and a high flow air cleaner. Told Frank I wanted quiet mufflers and my great fuel mileage with the supplied tune.
I got it. Mileage might have dropped 1 to 3 mpg, but not anymore then that. Still running very high 40's with great power and nice sound.
There is a happy medium with fuel and air.
No need to dump excessive fuel.
That is what computers have given us. The ability precisely meter the correct amounts for performance and economy.

in my garage now...
2007 Dyna Screamin Eagle ... SOLD !
2011 RGU Merlot SunGlo
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