| Author |
Message |
    
Daniii
| | Posted on Friday, January 14, 2011 - 12:07 pm: | 
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Move to high altitude! I saw a tank average 51 mpg when riding in the mountains. I get about 32 mpg around town in Dallas. I've managed to push it to 41 by doing the "froggy" thing. It's a fun technical exercise. Just not fun riding.
I once got 40mpg for a tank riding with a bunch of cruisers. That wasn't much fun either.
The right wrist seems to controls MPG for the most part. |
Guilhem0018
| | Posted on Wednesday, January 19, 2011 - 01:23 pm: |
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All right,
I think more explanations are required as some of you seem becoming crazy for bad reason.
1/ I use to go on cirduit almost every week, and of course I don't look at any fuel economy under these conditions.
2/ But rest of the time I use the bike to go working etc. Mainly city with many red light etc. Results is a quite high average: 11 liters/100kms
So I tried Erik Buell Racing ECM, I tried asking them for some advices etc. nothing.
My first idea about the idle is that with Erik Buell Racing ECM the idle is far lower than with stock. Now as I have tuner pro etc I have changed it to have a lower idle (1300 instead of 1500rpm)
The power commander helps me to tune the bike in a way that stock system is not able to do for the simple reason that I used the autotune with wideband sensors and not narrow band silly stock sensors.
But now and thanks to the power commander I come aware that the AFR ratios are different at low rpm between front and rear cylinder. This seems not normal as they should be within the same values and here I read sometime more than 1.5 of difference.
So I may have detected an air leak issue. I have check exhaust and no leak so I'm afraid of something else. This could also explain my high fuel consumption if front o2 sensor read too high value the system would have enriched too much as the power commander do to compensate..
So now if someone has an idea of what could lead to a high afr only for my front cylinder(admission leak, spark issue, valve clearance)
To go further, there is no difference at higer rpm and large open throttle.
For other guys who have rooten the post: yes I have though buying a scooter or else to go job etc. But Paris is expansive for insurance and parking place... |
Froggy
| | Posted on Wednesday, January 19, 2011 - 01:31 pm: |
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Take off all the power commander stuff and see how your fuel economy does. If you are already running a Race ECM you do not need it, I suspect the power commander is adding too much fuel.
For those too lazy to do the math, he is getting 21.3MPG-US, which is on the low side, even for a bike that is ridden hard. |
Dannybuell
| | Posted on Wednesday, January 19, 2011 - 01:49 pm: |
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Guilhem0018 - This site is very E-B-R oriented. As firemanjim stated Power Commanders are good. Everyone agrees with wide band o2 superiority. In Oregon Latus HD will only do piggy back mods to the 1125 and they have some of the best tuners in the state.
I keep the tires inflated to the tire manufacturers upper limits for less rolling resistance. I don't know how the gas is in you area, in Oregon the better brands make a big difference in gas mileage. |
Hootowl
| | Posted on Wednesday, January 19, 2011 - 02:56 pm: |
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"remain in a catlike crouch"
This is good advice regardless of whether you are on a motorcycle 
I have to agree with Froggy. Take off the PC and see what happens to your mileage. The race ECM you have should be just fine. If you're still getting poor mileage with just the race ECM, start looking elsewhere for your problem. Seems like the easiest troubleshooting step would be to simply remove the PC.
FMJ: The PC is a great tuning tool. I had one on my X1 until the race ECMs came out. My bike is not heavily modified, so I didn't need anything other than the race ECM. I was having some missing issues I thought might be related to the PC, so I replaced it with the race unit. Didn't make any difference. |
Ratgin
| | Posted on Wednesday, January 19, 2011 - 07:35 pm: |
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The R will never be a "great" street bike.
It hates low rpms,
its geared WAY to tall to idle along in traffic (wont get into the turkey cooking heat it gives off),
and if you run it at low rpms you risk having the charging system die.
It does however like blasting along a back road sucking great gobs of fuel at 7500 rpm as you grin like a madman.
(Message edited by ratgin on January 19, 2011) |
Drawkward
| | Posted on Wednesday, January 19, 2011 - 11:25 pm: |
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Froggy: 21 is definitely low like you said. Even with 11 trackdays last season (March until Dec) my cluster still shows 23mpg average.
(Message edited by drawkward on January 19, 2011) |
Guilhem0018
| | Posted on Thursday, January 20, 2011 - 01:33 am: |
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OK so for you 21mpg is normal? That was my average when I was completely stock
Because in fact until now with the PC I have reduced my fuel consumption except at idle so be sure that I won't remove it and come back to the stock system.
Have you also noticed that at idle the consumption is quite high: After a reset of the average I see a consumption about 0.2 litres evrey 15 seconds which means a few litres within a few minutes. |
Rpm4x4
| | Posted on Thursday, January 20, 2011 - 10:54 am: |
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It is like God offering you advice, and you saying, no I think I'll take this guys advice.
LOL AMEN!
Erik Buell Racing designed the bike, don't you think they are going to know how to make the best map for it?
 |
Guilhem0018
| | Posted on Thursday, January 20, 2011 - 12:13 pm: |
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EB has made a bike for everybody everywhere in the world.
I want a bike only for me where I am.
So as it appears that 21mpg is not normal, it is not linked to eb work but to something wrong with my bike (and I insist phenomenom has existed since stock bike!!).
So If you don't mind and if you can, try to make some interesting suggestions.
What about an air leak somewhere?
What do you think about that? |
Rpm4x4
| | Posted on Thursday, January 20, 2011 - 12:52 pm: |
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If it was an air leak you could detect it by using a propane torch and fogging the intake seals area to see if it revs up but I really think its a mapping error possibly brought on by the power commander. Its my understanding that the ecm learns and adapts to a certain extent. I guess I cant comprehend the need or want for a power commander when Erik Buell Racing makes an ECM that is so perfect, smooth, cheap, and reliable for this bike. |
Stimbrell
| | Posted on Thursday, January 20, 2011 - 01:30 pm: |
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Guihem0018,
If you see a consumption of about 0.2 litres every 15 seconds at idle you would drain a full tank of fuel in less than half an hour, I do not think the engine would even be able to continue to run if it was that rich, something else must be happening. I do not think the bike could use that much fuel at a constant 100mph+ |
Colintornado
| | Posted on Thursday, January 20, 2011 - 01:36 pm: |
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I am in England and ride my bike quite fast,I had it standard and then fitted an ebr ecu,it shows about 37mpg average with either ecu so there must be something not right with yours.
With the ebr ecu I am sure I could get even better mpg if I tried as it runs smoother at low revs.
I would suggest put it back to standard,ride it a while then see what afv`s you have on the dash.Also check the fuel pressure etc. This might give a clue to your high fuel use.
An air leak on one cylinder may show up by the o2 sensor telling the ecu to richen that cylinder. |
Stimbrell
| | Posted on Thursday, January 20, 2011 - 01:55 pm: |
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Colintornado,
I am in England too and have the ebr ecm and show 25 UK mpg, I do live in a city so all rides start and end in stop and go traffic. My Sportster gets about 36 mpg in the same situation.
Does seem to be a big difference in fuel use with these bikes. |
Colintornado
| | Posted on Thursday, January 20, 2011 - 03:04 pm: |
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It is always hard to compare mpg due to lots of factors,I had a sportster before the buell and that averaged about 36mpg(but riding much slower) I suppose if you are actually stopping and starting a lot then your consumption will rise. I would not expect mine would get that low,but I cant say for sure unless I try a long ride around london? I have a tl1000s and the buell is much better on fuel than that bike. |
Guilhem0018
| | Posted on Thursday, January 20, 2011 - 04:04 pm: |
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thanks for your feedback,
I will make a leak test tomorrow, we never know...
one last thing:
eg when i am at about 50mph in 3rd gear then I roll off throttle, the instant fuel value never decrease below 5litres/kms (47mpg) strange?
Same for example throttle off, no gear engaged, low running for example just before stopping at red light instant is around 10l/100km (23mpg)
should it not be very low? |
Bueller4ever
| | Posted on Thursday, January 20, 2011 - 08:17 pm: |
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There is no way that anything is going to account for 10mpg of fuel disappearing. Your bike would be running like crap if you had a vacuum leak that big.
How are you calculating your mileage? If you aren't setting a trip meter when you fill up and then dividing the mileage by the amount of fuel it takes to fill it up again, then you aren't getting an accurate result.
If you are doing all city riding where you only go 35mph and stop ever 3 seconds for lights, then 21mpg is pretty decent imo. |
Zac4mac
| | Posted on Thursday, January 20, 2011 - 09:58 pm: |
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FWIW - I dropped the front tire pressure from 42psi to 39psi and lost 7 mpg.
If you're commuting a lot, pump up your tires and ride as SMOOTHLY as you can.
I reset the AVG on the IC in Sept - 39 mpg AVG now.
Z |
Benzo_mike
| | Posted on Thursday, January 20, 2011 - 11:46 pm: |
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All - Lets not ignore the 800 pound gorilla in the room! This guy is UNFORTUNATELY riding one of the nut-strangled 105 HP French model 1125's, and he has my eternal sympathy (this is the freakish cousin down 40 HP). Who the F knows what buggery was done to his bike to choke it down to such a limp horsepower level, and frankly, who cares? I think that this is at the root of the situation, though. |
Captainkgb
| | Posted on Friday, January 21, 2011 - 12:29 am: |
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I thought my Buell was bad on gas, until I rode with a friend with a Binelli CR that averaged in the teens.
CaptainKGB |
Trafford
| | Posted on Monday, January 31, 2011 - 04:04 am: |
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I have an XB12R and an 08 1125R. Yours is a CR and that has different gearing.
I do not use the clock read out for Fuel consumption, but I have kept a log of every fuel receipt and I write down refill distance traveled at every fill-up on both bikes.
The XB12R average over 8000 miles (12800 ks) is 53 mpg (imperial gallon) or 18.5+ kilometers per liter)
The 1125R average over 8000 miles is 42mpg (imp)or 15+ ks per liter
This is an overall average since new so there are fast rides and slow rides in here of course
(Message edited by trafford on January 31, 2011)
(Message edited by trafford on January 31, 2011) |
Zac4mac
| | Posted on Monday, January 31, 2011 - 09:02 pm: |
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IIRC, the French 1125 has either a different or modified throttle body that doesn't open all the way and possibly a unique ECM map.
If the 'noid and tailpipe outlets are any indicator, the mods to strangle the 1125 should be easy(relatively) to circumvent.
If that's the case, better mileage should be attainable than ours. ?.?
Just a thought... maybe Anony will drop in and clarify.
Z |
Guilhem0018
| | Posted on Friday, September 09, 2011 - 05:17 am: |
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Hello,
For all stupid guys who are thinking that 21 mpg is normal and that power commander is bullshit:
- I have solved my problem and of course 21 mpg is not a normal consumption!!
- The problem was elsewhere and thank to the PC which helped me to figure out the rootcause and now allow my bike to run as a real dragster with a normal consumption
As we say in France: Connard |
