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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through October 01, 2008 » Solenoid Removal vs Fuel Economy « Previous Next »

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Ponti1
Posted on Wednesday, September 24, 2008 - 11:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anyone else notice MPG drop with solenoid removal? I reset my average MPG counter every tank. Just sort of a habit, I guess.

I have been reluctant to post it since nobody else has mentioned it, but mine was averaging 37-38 every tank for several thousand miles. After solenoid removal, I have not had a tank run average of more than 34 MPG.

Riding habits have stayed the same. Only thing I can think of that's not been constant is the temperature for my morning commute is now usually in the 50s instead of the 60s, though I can't imagine that would have a dramatic effect.

Thoughts?
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Krassh
Posted on Wednesday, September 24, 2008 - 11:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The solenoid has no bearing on fuel mileage.
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Ponti1
Posted on Wednesday, September 24, 2008 - 11:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would have thought the same, Krassh. However, I sh!t you not that it happened the very tank after I removed mine.
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Krassh
Posted on Wednesday, September 24, 2008 - 11:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I hate to say it but that has got to be a coincidence. The only thing the solenoid does is retard the throttle at a certain RPM in 3rd gear for EPA noise.

Unless you boggered something up when you had it apart.
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Fresnobuell
Posted on Thursday, September 25, 2008 - 12:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

No change in my mileage pre and post...matter of fact it went up from 29 to 30...but that is due to extended freeway intervals.
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Jpfive
Posted on Thursday, September 25, 2008 - 07:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

No change in mileage for me after solenoid removal, though the rear AFV did change. I was running 100F/100R before the change - rear cylinder runs at 105 now.

First full tank since the re-flash was 40.8 MPG, AFV's were 100/100 after the flash, but rear has adjusted back to 105 since.

Jack
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Zac4mac
Posted on Thursday, September 25, 2008 - 08:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hook the solenoid back up and see if your mpg goes back up...


Z
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Sportster_mann
Posted on Thursday, September 25, 2008 - 08:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I hate to say it but that has got to be a coincidence. The only thing the solenoid does is retard the throttle at a certain RPM in 3rd gear for EPA noise.

If its job is to retard the throttle then surely it will use less fuel - now that you are free to use the throttle to its full potential I can quite easily see why fuel consumption would go up !
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Fresnobuell
Posted on Thursday, September 25, 2008 - 03:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Sportster...Solenoid activates under very specific circumstances and when it does activate, it only affects the throttle for seconds at a time...not enough to affect MPG.
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Pridayr
Posted on Thursday, September 25, 2008 - 05:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Riding habits have stayed the same."

So..... you haven't played with the throttle a little bit more?

Rob
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Bob_thompson
Posted on Thursday, September 25, 2008 - 07:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Andrew(Ponti1), as you suggested, the cooler air is denser and would require a bit more fuel to maintain correct A/F ratio but, like you, I don't think it would drop as much as you have seen with just 10 degrees difference. I found with my 'noid disconnected and throttles locked I have a tendency to ride more aggressively. Maybe?
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Two_buells
Posted on Thursday, September 25, 2008 - 07:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

just a thought, maybe the INTAKE SNORKEL is not lined up when you put the air box back together and is restricting the air flow, its worth a check.
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Two_buells
Posted on Thursday, September 25, 2008 - 07:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On my trip over to the dealer to get my ECM flash I beat the snot out of the bike and was getting 29 mpg avg.
The average trip to the dealer was 31.

The trip home after ECM flash was 34 mpg avg. riding even harder than the trip there.
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Boltrider
Posted on Friday, September 26, 2008 - 12:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Regarding this solenoid....is the 1125R louder than the XB12's?

(Message edited by boltrider on September 26, 2008)
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Ponti1
Posted on Friday, September 26, 2008 - 07:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So..... you haven't played with the throttle a little bit more?

I first thought that was a possibility since I did try a number of times to got WOT and trip the CEL, but have since run several tanks of nothing but steady commuting. Yesterday, I rode to work on the interstate 30 miles after filling up with fuel. Held a steady 75 MPH the whole way there, and read 34 MPG when I arrived.

maybe the INTAKE SNORKEL is not lined up when you put the air box back together and is restricting the air flow, its worth a check

I'll check the intake snorkel tonight to verify all is as it should be, though I was pretty meticulous when doing the solenoid removal. Like you said, definitely worth a check.
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Dano_12s
Posted on Friday, September 26, 2008 - 09:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ponti1,have you gotten the new remap?My actual MPG went from 31-33to40-43.Feels like a new bike!I haven't yet taken a steady highway trip could get into 48-50 range.
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Ponti1
Posted on Sunday, September 28, 2008 - 11:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Dano, not yet. Will be making the trip to Somerset next weekend. Lloyd keeps calling telling me that he is impressed with the result. Also keeps telling me about a customer that had rave reviews...Was that you?

Well, checked my intake snorkel and it was fine. While I was in there I checked for anything that looked odd, and also saw nothing.

Oh well, not that I bought this bike for MPG anyway. Will go get the reflash and be done with it.
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Dano_12s
Posted on Sunday, September 28, 2008 - 12:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ponti,must have been me- it's like getting a new bike!
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Zac4mac
Posted on Sunday, September 28, 2008 - 10:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Boltrider - different solenoid.
Yours is in your exhaust, ours closes our throttle butterflies at a certain point (WFO at 4850rpm in 3rd gear).

Z
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Boltrider
Posted on Sunday, September 28, 2008 - 10:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yours is in your exhaust, ours closes our throttle butterflies at a certain point (WFO at 4850rpm in 3rd gear).

Gotcha.
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Chameleon
Posted on Monday, September 29, 2008 - 04:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Solenoid activates under very specific circumstances and when it does activate, it only affects the throttle for seconds at a time...not enough to affect MPG.

Yeah, like when I wanted to pass a car. I finally had enough of that shit and took care of the solenoid. Now it does what I want when I want.


BTW, I have actually noticed a mileage improvement, but I think it may be due to my riding habits changing more than anything.
Went from 28-29 to 31-32. Most of my riding is in the city. I did get 37-38 on a 725 mile trip a few weeks ago.

Looking forward to the new map; taking bike in tomorrow for that and other service.

(Message edited by chameleon on September 29, 2008)
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Fresnobuell
Posted on Monday, September 29, 2008 - 05:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just be glad that BMC handled the noise emissions the way that it did (allowing us to easily bypass it). Honda did it by reducing the max RPM (thereby decreasing max HP) on its 2008 US model CBR1000RR versus its European models. This is because the EPA tests noise at 1/2 the max HP RPM and Honda felt this was the best way to handle the EPA. As much as we bitch about the solenoid, I bet American 2008 CBR1000RR owners would very like to have the solenoid as opposed to dropping the top end HP a bit.

Also, it explains why the cutout happens at the RPM that it does on our Buells--that's about 1/2 the RPM of where our motor makes max HP (9,800 RPM).
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