gas mileage

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May 26, 2007 | 08:49 AM

r0ckie

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gas mileage

I added a PC III, V&H Slip-ons and Ness Big Sucker. Great power now but mileage went from near 50 to barely 40. Can't I have it all??????

May 26, 2007 | 09:29 AM

100thRK

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From: Slidell, LA

RE: gas mileage

No.

May 26, 2007 | 09:40 AM

robbitybob

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RE: gas mileage

Well you sure can't get max power/torque AND max mpg but there arebikes on this boardthat are doing better than 40 mpg and still have good power. Have your bike dyno'd and tell the tuner what you want.

May 26, 2007 | 10:24 AM

gman

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Joined: May 2006

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From: Boise, Idaho

RE: gas mileage

yes you can. ride the Harley for the riding experience, buy a Vespa for the fuel mileage. Just heard that Vespa has a new theme song "Born to be Mild"

May 26, 2007 | 10:31 AM

xxxflhrci

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RE: gas mileage

First, if you were getting nearly 50 you were doing better than most or only riding very conservatively at speeds under 60 mph all the time. If the only changes that you made were slip-ons, an air cleaner, and aPCIII and didn't change your riding habits and your mileage went from near 50 to barely 40, you need to have your bike retuned.

May 26, 2007 | 05:13 PM

iclick

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Joined: Sep 2005

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From: Baton Rouge, LA

RE: gas mileage

Quote:

ORIGINAL: r0ckie

I added a PC III, V&H Slip-ons and Ness Big Sucker. Great power now but mileage went from near 50 to barely 40. Can't I have it all??????

You can regain some or all of your lost mileage at cruise (highway) with some tweaks to your PCIII map. Attached is my original canned map from Fuel Moto (top, "PCIII-2a") and tweaked (bottom, "PCIII-2b"). Note the "take-off range" (1k-2k RPM @ 2-10% TP) and the "cruise range" (2k-3k RPM @ 5-10% TP). Don't mess with anything above 10% TP, as to do so will likely create a flat spot at roll-on, as above 10% TP s outside the cruise range. Mine is a bit different at 20% than original (PCIII-2a) because I moved 0-20% from an older map that worked well. Confusing, I know.

The important range is this "cruise range," and I've had no heat or detonation side effects changing these values on this SG and a friend's Deluxe. If you hear detonation, increase these values slowly until it disappears.

Mileage at cruise is >50mpg (46-48 in cold weather) on my bike with few cold starts, which kills mileage. This is given you don't have a lead hand (aka lead foot in car parlance), as when you get out of the cruise range you are dumping more gas into the mix.

[IMG]local://upfiles/4327/6B51A82AB8D44386AB4C932D1475BF23.jpg[/IMG]

May 27, 2007 | 11:11 AM

tomracer69

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RE: gas mileage

07 road king classic.... sert /slip-ons big sucker.50+ mpg..i too am amazed ,the interststes i ride on in nj 78,278,garden state pkwy you have to do 75+ to survive. i wiegh only 150lbs & thses # are solo....BUT 50 PLUS MAKES ME SMILE ...never had it dynoed after the sert .all the way around,faster, cooler.less noise. was not to sure about sert /pc/fuel pack..hate to say it i am a BIG SERT FAN...TOMMY NYC...