Engine mods and gas mileage
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Joined: Apr 2006
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From: Santa Rosa, CA
Engine mods and gas mileage
I currently have a Stage 1 and PC III and since I added those I've noticed I'm not getting the mpg I used to. I'm considering doing a 95" big bore kit and was wondering how that affects fuel mileage?
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Road Warrior
Joined: Jun 2006
Posts: 1,291
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RE: Engine mods and gas mileage
I'm getting better mileage after my 95 Stage IV than I did with an 88 stage I . I've got almost 8000 miles and it's consistent. I get 45-48 normal , and if I lay back on mellow roads have gotten as high as 50.3 . This is with 98hp and 100 lbs ft. The trick is match components and a good dyno tune
Road Master
Joined: Nov 2006
Posts: 1,227
Likes: 3
From: Central Illinois
RE: Engine mods and gas mileage
Dynarider, All Dynojet map are tuned for max power. To increase fuel economy highlight between 2000-4000 rpm / 5-40 percent throttle with a computer, preferably a laptop. The area highlighted is where you can increase fuel economy. Take the highest value in the 2000-4000 / 5-40 percent area highligted and the lowest. then split the difference. If the highest is +20 and the least is -5, you have a difference of 25. Half is 12.5, so round down (because we are decreasing fuel) to 12. Drop that highlighted area by 12. This will increase your fuel economy. Remember 0 is stock (0 stage 1 download, if installed). Ride the bike and check plugs. If you have a lean spot or hesitataion, watch what rpm and work on that area only. If you have decel "pop" highlight 0 percent throttle from 2000-redline and put -10 to start. This will "shut off" fuel injectors when throttle is chopped at these rpms. Any lower that 1500 will affect idle. All injectors have a "bleed off" that still delivers fuel when throttle is chopped, thus lowers fuel economy. If you still have pop increase this number -15 and so on until gone. Don't exceed -50. Engine mods mean your engine is becoming more efficient and doesn't always need more fuel.
Tourer
Joined: Mar 2006
Posts: 449
Likes: 1
From: Ventura, CA (So Cal)
RE: Engine mods and gas mileage
The best gas milege i have gotten was 45.3. I got this milege twice, once with my bike stock and the other time after i put on a hypercharger, vance and hines and did a sert on the dyno. I was averaging 75-80 when i got that milege. I usually average 40 city highway mix, and have gotten as low as 35 mpg but that was all around town with short trips going the 3 mile round trip to work and back.
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