4strokeluvr111
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With the help of another friend from this board I am trying to fine tune the clutching on my 2005 Vector. I know the shift RPM is 8500 and my sled is doing that. I recall this being brought up in the past but a search didn't come up with anything helpful.
Just curious at what RPM's is the peak HP?
Just curious at what RPM's is the peak HP?
thrasher
TY 4 Stroke Junkie
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From what I could find, seems to be within 1 hp from 7800-9100 rpm, so has wide range for clutching. Saw a dyno chart somewhere on here awhile ago, but can't remember where. But seem to recall maximum hp around 8300 rpm. Probably a little different for each engine.
Metallicat
TY 4 Stroke God
8400-8600 from what I have read and have been told is the ideal operatimg rpm. I run mine at 8800 however.
davessrx
Extreme
4strokeluvr111
Please stay between the markers!
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Thanks Dave....you are a GOD! 
OK...dumb question.....with such a broad HP range.....does more RPM = more speed? Or is it speed = HP?
OK...dumb question.....with such a broad HP range.....does more RPM = more speed? Or is it speed = HP?
theCATman
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Speed= HP.
When tuning a car,cycle, snowmobile, etc. on track, if you gain any MPH in the 1/8, 1000', 1/4 with your changes, you know that more power is being made.
RPM means nothing other than where the design of the engine makes it's best power (CR,cam,heads,bore,stroke, etc)
When tuning a car,cycle, snowmobile, etc. on track, if you gain any MPH in the 1/8, 1000', 1/4 with your changes, you know that more power is being made.
RPM means nothing other than where the design of the engine makes it's best power (CR,cam,heads,bore,stroke, etc)
davessrx
Extreme
I'd try to find torque specs if you are getting this crazy. At some point the rpms get high the hp stays around the same but the torque will drop off.
davessrx
Extreme
FOUND THIS IN A SEARCH HERE, took awhile!
Torque curve on this engine is pretty flat from 5000 rpm up through 8800 rpm or even more. 74 ft-lbs at 5000 rpm, peaking at 81 ft-lbs @ 6900, still over 70 ft-lbs at 8800.
Another thing make sure the tachometer is accurate. I had a poo I couldn't get right with clutching to find my tach was 400rpms off. I'm sure the yamaha's are much better made but still check it.
Torque curve on this engine is pretty flat from 5000 rpm up through 8800 rpm or even more. 74 ft-lbs at 5000 rpm, peaking at 81 ft-lbs @ 6900, still over 70 ft-lbs at 8800.
Another thing make sure the tachometer is accurate. I had a poo I couldn't get right with clutching to find my tach was 400rpms off. I'm sure the yamaha's are much better made but still check it.
Metallicat
TY 4 Stroke God
I've clutched my Vector to run at 8500, 8800, and one year 9100 on a long run. It seems to run great either way. I think setting the clutches up to let it rev out more on long runs gives a bit more top end. At 9100 I was seeing 108 easily on long runs. 8800 about 105. 8500 a bit less. These speeds are on normal groomed RR grade trails. Either way it is fast enough. I don't really like riding that fast for more than a few seconds. Too many things can happen. And if I was really into speed I would be on an Apex anyway. I mostly just trail cruise between 50 and 70.
