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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through May 19, 2011 » Holy Clutchless Shifting Batman « Previous Next »

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Bwbhighspl
Posted on Thursday, May 05, 2011 - 10:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know there are a few threads out there on this, but nothing recent -- and I have got to share my experience.

It's awesome. I've never done it before and was nervous. If you've never tried, and you have an 1125, give it a try. You'll never go back.

I found that it works best at engine speeds over 6k, and you want to keep going faster. Just put a little up pressure on the shifter, about as much strength as it takes to lift your cell phone off the table, maybe a little less. Give the throttle a little blip down, maybe roll off by 15%, and ta-da! Next gear! It literally falls into gear, and it takes no pressure.

When you get it right, it feels like you're in a swing and someone just gave you a big push. Under hard acceleration, it makes no sense (to me) to throw in that clutch anymore.

It also makes the concept of no gas, clutch, shift, slow gas, slow clutch, gas seem kind of silly.

You have to try it. I'm addicted.
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Jdugger
Posted on Thursday, May 05, 2011 - 10:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Wait until you get a quick shifter and don't even have to blip the throttle!
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Syonyk
Posted on Thursday, May 05, 2011 - 11:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Is there an easy way to set up a quick shifter with the Erik Buell Racing race ECU but an otherwise stock 1125R? I imagine you need some variety of switch to trigger it.

I certainly clutchless shift on occasion, but I usually give the clutch a little bit of a wave. Maybe 1/8th travel or so - it's just enough to smooth things out slightly.
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Nillaice
Posted on Friday, May 06, 2011 - 12:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

pre-loading the shifter speeds up the process enough for me. i feel that i still like to use the clutch. YMMV

but it is super-quick
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Bueller4ever
Posted on Friday, May 06, 2011 - 03:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Why no gas, slow gas, slow clutch? I still use the clutch, but I don't let off the gas completely.
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Mountainstorm
Posted on Friday, May 06, 2011 - 07:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Try power shifting down. That'll blow your hair back. Did that a couple of times accidentally by tapping the shifter before I pulled in the clutch. Hang on.
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Jdugger
Posted on Friday, May 06, 2011 - 07:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

> Is there an easy way to set up a quick shifter with the Erik Buell Racing race ECU
> but an otherwise stock 1125R?

Yes. The race ECU can be programmed with quick shifter functionality. What pin that functionality listens on is up to the programmer.

Then, you run the two wires to the switch sensor. A pull type (I think) for GP, and push type for standard. With standard shift, you are going to have to rig something up, since the normal switch-inline-in-the-linkage trick won't work.
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Hybridmomentspass
Posted on Friday, May 06, 2011 - 08:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

clutchless shifting is a must in dragracing. And whats nice is that is does no damage to anything. I know for a fact I've made over 1000 shifts on my tuber without the clutch (many with an airshifter, so you stay WOT the whole time), no issues.

I do clutchless upshifting occasionally on my 1125, yes, it is nice
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1_mike
Posted on Friday, May 06, 2011 - 10:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Doing it "correctly"....works at most ANY rpm...!
It's easy at 2500 rpm also..

From just driving around town, to getting on the freeway (yea..high rpm!).

Up-shifts, down-shifts...just takes good coordination between the mind, foot and hand.
Been doing it for years, kinda like breathing, difficult "not" to do it.

Mike
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Kinder
Posted on Friday, May 06, 2011 - 10:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

After trying a few different oils I found that oil choice affected my clutchless shifting. So far Amsoil has worked the best. Much smoother shifts.
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Jdugger
Posted on Friday, May 06, 2011 - 10:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Fresh oil makes a difference, too. My standard procedure is to change the oil when shifting gets "slightly sticky".

I pretty much ignore the service mileage recommendations.
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Chessm
Posted on Friday, May 06, 2011 - 11:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i got used to doing clutchless upshifts everywhere i go thanks to the stupid clutch weep


now see if you can learn how to do clutchless downshifts. that one gets hairy when you get it wrong lol
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Crowley
Posted on Friday, May 06, 2011 - 01:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Chessm, keep the faith. Oberon Performance (UK) will have a replacement clutch slave cylinder ready for testing late June/early July. I should get my hands on it after that for a long term road test.
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Guy_glover
Posted on Saturday, May 07, 2011 - 07:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

hold pressure up on the shifter at WOT -The very first BLIP of the rev limiter will put you in the next gear. Let off the shifter and reapply pressure before it hits redline again.
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Nillaice
Posted on Saturday, May 07, 2011 - 08:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

never thought about using the revlimiter like that, but it sounds like it'd yeild good times ... or at least better times than other methods (aside from a proper quick shifter)
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Bwbhighspl
Posted on Saturday, May 07, 2011 - 09:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The very first BLIP of the rev limiter will put you in the next gear

Awesome. Just awesome.

But....what if you could program the ECM to rev-limit at 11k instead of 13k (or whatever it is)? You'd get the blip at the start of the red line instead of the end of the red line.

Where's my ECM1125Spy when you need it???
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Jgarner99
Posted on Saturday, May 07, 2011 - 10:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Note to those reading this thread, and interested in keeping their bikes in one piece:
Clutchless upshifts are okay. Clutchless downshifts are definitely NOT okay.
To understand that statement, think about what a transmission does. Placed between the engine and the rear wheel, the tranny acts as a force multiplier (i.e, lower gears provide more "leverage" and higher gears provide more "speed").
During an upshift, the leverage is changing from a higher to a lower value, therefore, there's little chance of breaking anything. During a downshift, on the other hand, the leverage is increasing, so the chance of exceeding engineered loads is quite possible.
Don't flirt with disaster. Use the clutch, along with a blip of the throttle to match gearbox speeds, for all downshifts.
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Mountainstorm
Posted on Sunday, May 08, 2011 - 10:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

+1

I use the clutch the same way I use the brake. I would not just slam on the brake. That would have undesirable effects. I've never intentionally power shifted down.

On the way up it's probably less wear and tear on the power train, if you do it right, than using the clutch. I combine the two and barely touch the clutch when going up through the gears, but I use it like a brake on the way down.
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