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Mods to increase fuel range?

8.7K views 61 replies 28 participants last post by  Jay-ID  
#1 ·
I'd like to put a bit of money into my bike to increase the fuel range. The Harley guys I ride with occasionally can't rag on my bike for anything else so they focus on the range. I have run out a couple times on longer rides with them. I now carry a 1 gallon fuel can but I still catch grief when I have to stop and fill up.

My '06 has a V&H pro pipe, Patrick Racing Big Air Kit, PC5, and AIS removed. I did have it professionally dyno tuned. The fuel light usually comes on at 100 miles (that's with plenty of right wrist). I can baby it and get ~140 miles including the reserve.

From some research, here's the mods I'm planning to increase range:
- KrankVent
- Drill some higher vent holes in the filler neck
- Dynatek DC2-1 coils
- High-compression pistons

Those all have been reported to show minor gains. Any disagreement? I like that none of them would reduce power. The coils and pistons should be a minor power gain. I've also considered a 33 tooth front pulley but I'd rather not lose the acceleration. Any other suggestions? If I'm putting in the pistons then should I consider some other engine upgrades that have a neutral or positive impact on MPG? Are there cams or head work that would increase range?
Thanks.
 
#3 ·
Mplayer1



How much more distance are you trying to achieve? I have almost the exact bike with the same equipment and mods and I get about 43 mpg and that's been consistant for the last 1500 miles. My reserve light comes on consistantly at around 127 miles. I've never put more than 131 miles on it before fill up but my guess is I should safely be able to go 150 miles on a full tank. I like to be aggressive too and choose my moments of thrill. I just drive it and it always get 42-43 mpg. If you contact power commander they can walk you through getting your best mpg without sacrificing acceleration. They will lean out the throttle range where you want to be economical. I don't know that you could really expect more than about 150 miles per tank without additional fuel storage.
 
#9 ·
How much more distance are you trying to achieve? I have almost the exact bike with the same equipment and mods and I get about 43 mpg and that's been consistant for the last 1500 miles. My reserve light comes on consistantly at around 127 miles. I've never put more than 131 miles on it before fill up but my guess is I should safely be able to go 150 miles on a full tank. I like to be aggressive too and choose my moments of thrill. I just drive it and it always get 42-43 mpg. If you contact power commander they can walk you through getting your best mpg without sacrificing acceleration. They will lean out the throttle range where you want to be economical. I don't know that you could really expect more than about 150 miles per tank without additional fuel storage.
I'd be happy with a reliable 155 mile range.

When I had it dyno tuned, I did ask the tech about making it a bit lean in cruising situations. He said the same air/fuel ratio (13.?) would result in the best performance and fuel economy across the map. Personal accounts on this forum seem to contradict that.
 
#4 ·
I have put a 5 gal tank on the back of my bike for the long road trips that is plumbed directly into the main fuel lines. I have been working on taking care of any kinks from my initial setup to make sure it works without any problems before I make any write-ups on it. I havent had the opportunity to actually run both main and auxiliary tank dry to see how far I could get the bike before having to refill due to a few kinks in my setup, but if remember correctly I think I could get around 300+ miles per fill.

when I get some free time from the military, I will be making a few more small adjustments to my setup and post it up on the forum.
 
#5 · (Edited)
Since i've had my bike i get about 100 miles until the low fuel light comes on. Sometime a little more but it was a freak event. I've gotten 90-95 miles a few times also. My engine is stock other than Church Key VBAK, Power Commander III, and i've had the dynatek DC-2 coils on before and i can't get the higher milage other members here have. I don't ride my bike hard except a few spirited runs. I haven't strapped on an xtra fuel can but i may in the future. I will be keeping an eye out on this thread. It would be nice to at least get the 38 mpg it is supposed to get. I have almost 38,000 miles now in 7 years.
 
#6 · (Edited)
there seems to be evidence that if you build the motor, you get better mpg's. it happened to me {cams,pistons,ecu,springs} and there are guys with 108's and 110's that will say the same, but that's a lot of money just to get better mileage. you do get some other benefits though. the problem is, they {your buddies} simply have bigger tanks. i also have a krankvent. i doubt it does anything.
06warrior, what do your plugs look like, because you should really be able to get 40-ish easily enough. maybe it's the heat/humidity but it gets every bit as hot/humid {iowa} on occasion, as it does in miami, and i can get +45 when taking it easy on long rides.
 
#7 ·
I have an '08. I have not gotten into any internal mods as of yet, but the bike has shaved some pounds. I also shaved some pounds. That being said, if I run my HK's or my Holeshot exhaust my mileage is about the same. My light comes on between 115and 130 miles depending on how bad I thrash on here. Im also running dyna's, with a pvc and Auto tune. I just don't think your going to do much better. If your go full stage 4, you might get another 5 or 10. Your just not going to do any better than that. Our bike could use a true highway gear.

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#10 ·
all kinds of ideas here but the most effective mpg trick has nothing to do with the fuel , the tuning, or the motor size. a simple swap of a belt and a rear pulley to a 61 or 65 tooth rear pulley and a correctly sized belt will do the trick . the next thing will be the bike will seem so much more at ease going 80-85 mph or more and will spin way less rpms, btk572
 
#13 ·
No. It would be harder. You would have to drill out the holes on it and replace the belt with a different belt. For the 33 tooth front you would have to mill off the back lip off the pulley and you would have to replace the lock washer.

Heck maybe they're the same just depends on which sounds easier to you.

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#15 ·
From what I understand, the Roadstar 5th gear swap only fits 02 - 05 warriors. Too bad because that does sound like a good solution.

I like the 33t front pulley. That would give me the option to go back to a 32t or even a 31t (stock belt fit?) if I ever get around to taking the bike to a drag strip. I'll do some research on some power mods I could do to make up for acceleration loss.
 
#18 ·
the main issue isnt the bad mileage that our bikes get. its the deceivingly small fuel tank. if your going to spend money on a mod to increase mileage why not mod or change the tank to hold more fuel. most harley tanks are holding 5 to 6 gallons compared to our desk size tanks that only hold 3.5 gallons. i have thought of several ways to increase capacity and make it look cool but i havent done so yet.
 
#30 · (Edited)
..... most harley tanks are holding 5 to 6 gallons compared to our desk size tanks that only hold 3.5 gallons. i have thought of several ways to increase capacity and make it look cool but i havent done so yet.
You're close. Actually our tanks hold 3.2 gallons in the main tank and 0.8 gallons in the internal sub-tank for a total of 4 gallons.

From what I understand, the Roadstar 5th gear swap only fits 02 - 05 warriors. Too bad because that does sound like a good solution.

First I've heard that it won't fit all years, I don't think that is true. However unless you have a 02 or 03 that hasn't had the tranny recall done, it usually isn't worth the cost of a complete tear down to change to the Roadstar 5th gear.

I do have the roadie 5th gear and love it for the feel of having an "overdrive" gear and stopped me from reaching out for that phantom 6th gear that we don't have. However, I still have to stop about every 100-120 miles to refill. Fortunately for me, no matter how comfortably I've made my warrior, I still need to get off it for a few minutes ever 2 hours or so anyway. If you want superior gas mileage, you'll have to buy a Prius. :D
 
#24 ·
5-9 teeth in pulley change is way more then you will get with a roadie gear and a 33 front pulley. and the belt and a rear pulley is way easier then a case split for a roadie gear in the transmission. i have split tanks for the warrior and move the top of the tank up in the front and sides and left the rear back section alone so it still had a clean seat line, the last on i done i moved the front up 2.5 inches. like a pie shape if you were looking at it from the side. then seal it up with por15 gas tank seal and its a life time fixed tank, btk572
 
#26 ·
The Harley guys I ride with occasionally can't rag on my bike for anything else so they focus on the range. I have run out a couple times on longer rides with them.

You = siphon hose, distractions, HD jockeys gas tanks for gas donations - done.

Or = ignore HD jockeys, stop at gas station without the HD guys as required, get gas, stretch, grab a smoke, go quickly and catch up then pass the HD"s. Not too hard to do.
 
#28 ·
Maybe, maybe not. Depends.

My POV, stop when low on fuel, add fuel, continue, ignore the HD guys since they are not operating my bike.

I think a Warrior is not designed as a long range bike so work with it.

The mods, except for what seem to me to be extreme mods of adding aux gas supply, will only give a moderate range increase, not worth the trouble. Aux tanks just seem extreme to me personally, and add risk that I would not accept.I hear gas can burn or explode so I want it in the system as designed and tested. Call me crazy. I mean I did sell my Pinto.
 
#32 ·
There are some guys on here that recon they can get 65mpg so approx 260miles to a tank. I don't know how they do that.

There is one guy who recons he can get 60mpg with the wife and luggage, find that very hard to believe unless the maybe have big bore kit, or they turn the bikes off going down hills.

When most people on here are getting between 80-140 miles to a tank these other guys are doubling that, something smells fishy


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#38 ·
This post seems old, but I'll put my 2 cents in on my bike. I'm getting 50 to 68 miles on a full tank around town. I travel 5 min. back and forth from work. Is this normal? When I got my bike it has stock air boxes with K&N filters in them. The exhaust is Samson short slash with no baffles and a PCIII. It still has the AIS hooked up. When I got it I had to put baffles in the pipes because it was insanely loud didn't want to bother the neighbors. When I put the baffles in I realized they were put in backwards (CRAP!). Since then my mileage is what I had specified. It did get 119 miles in town until I did the baffles. Is this normal?
 
#43 ·
I do have an update. I've completed the following mods:
- High-compression pistons (10.25:1)
- Krank vent
- Dynatek coils
- Shorai battery
The bike went back to the dyno tuner and got an 8% improvement in HP and torque! I'll drill some holes in the filler neck and then collect MPG and range data in early March (5-day trip to Death Valley).

I did obtain a 33-tooth front pulley and had it milled down an 1/8 inch in width to fit. However, I didn't want the MPG gains of the pulley to drown out the impact of the mods above (and I wanted to play around with the 8% more power with the stock pulley). So, I'll figure out any MPG improvements without the pulley and then have it installed to report on the total improvements.