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post #1 of 13 (permalink) Old 09-14-2005, 09:36 AM Thread Starter
 
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Interesting shifting method

I've read about this in a car/bike comparo. The test was a 1 mile acceleration run.

I'm sure most of you know about the preloading the shifter and letting off the throttle long enough to unload the tranny. Well this rider went a step further.

He preloaded the shifter and waited for the rev limiter to cut the spark, which instantly put him in next gear.

I dont see that doing any good at anything other then acceleration tests, still it was an interesting Idea...



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post #2 of 13 (permalink) Old 09-14-2005, 10:19 AM
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well I know for a fact I'd loose too much power if I waited till that happened for me on the 929 at the dragstrip..

I have to shift much sooner.. more like around 10 to 11 rpm ... but def interesting idea..

I like the preload though it cuts down on the false N's I use to get by using the clutch...

I'm considering going to an airshifter but I like my trunk space too much LOL

E.

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post #3 of 13 (permalink) Old 09-14-2005, 11:00 AM
 
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Well you are definitely losing speed if you wait until your redline to shift, but it is still kinda a neat idea.
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post #4 of 13 (permalink) Old 09-14-2005, 11:05 AM
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Interesting, but not very useful. Doesn't just about every bike peak out well before their limiter? Whatever floats his boat.

Was this on the test of all the cars and the jet and the MV? I think I read that in there somewhere....I wasn't impressed.

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post #5 of 13 (permalink) Old 09-14-2005, 11:20 AM
 
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I preload the shifter then just blip the throttle. Shifts perfectly everytime. I also run reversed shift pattern, which makes it a lot easier to preload.

There are 2 things wrong with using the rev limiter to shift. Look at most any dyno chart, and you will see that the peak HP is well before the rev limiter. Also, most rev limiters don't reset untill the RPM's have come down a substantial distance. You'd be off the power even longer that way then just blipping the throttle.
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post #6 of 13 (permalink) Old 09-14-2005, 11:24 AM
 
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other than putting a bike on the dyno how do you know the optimal shift rpm?
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post #7 of 13 (permalink) Old 09-14-2005, 11:29 AM
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Quote:
Originally posted by mainerdr
other than putting a bike on the dyno how do you know the optimal shift rpm?
There are probably some who can tell just by feel, but really the dyno seems, to me, the only way. It would have to be your bike to be "optimal," but anyone who has the same bike and has had it dyno'd would be able to give you a pretty good idea.

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post #8 of 13 (permalink) Old 09-14-2005, 11:32 AM
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http://sportrider.com/bikes/146_Weights_Measurements/

sportrider has a quite a few measured. according to them, peak HP on my bike is 12.5K. redlines at 13.5K.
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post #9 of 13 (permalink) Old 09-14-2005, 11:39 AM
 
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good link z my bike is actually in there....
wonder if the muzzy pipe and jetting would push peak power bit higher rpm? That would be my guess, can't see it making more power under 10.5 than over with upgrades... but maybe.
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post #10 of 13 (permalink) Old 09-14-2005, 06:35 PM
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peak may be... but most jetting (at least to my understanding since my last bike had a jetkit) would improve mid-range. but there are some downside if not done well or over done. fuel consumption, lots of it. and the bike took longer to warm up in my case.
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