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 Speed vs RPM

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PostSubject: Speed vs RPM   Speed vs RPM I_icon_minitimeSat Aug 13, 2011 3:43 pm

Can anyone tell me what the Silverwing engine RPM is normally on a stock 2003 Silverwing at certain speeds..say 40 mph, 50 mph ,60 mph 70 mph etc? I have a new (to me) 2003 and am curious. Is there a chart or link some where? Thanks.
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bigbird
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PostSubject: Re: Speed vs RPM   Speed vs RPM I_icon_minitimeSat Aug 13, 2011 4:19 pm

x


Last edited by bigbird on Sat Jun 09, 2012 1:10 pm; edited 1 time in total
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The Scootist
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PostSubject: Re: Speed vs RPM   Speed vs RPM I_icon_minitimeSat Aug 13, 2011 7:31 pm

Elkk:
As mentioned by Bigbird, the speed vs rpm ratio depends on several factors. I just got a new 2009 in June and have been fixing it up to better serve my needs/wants. I used to have a 2007 and I had put a J Costa variator on it. The J Costa gave great accelleration, but I took a pretty big hit in miles per gallon of gas, so I am trying a different route to improved accelleration. With the J Costa when I was travelling an indicated speed of 60 mph my engine rpms were approximately 5100. With my new bike I have installed 26 gram Dr. Pulley sliders and now when travelling at an indicated speed of 60 mph my engine rpms are at 4500. I will post more information as I take more readings on rpms vs speed. However, I have noticed that with the Dr Pulley sliders, the engine rpms are significantly lower at a given speed than they were with the J Costa. With the Sliders, the bike is not quite as quick as it was with the J Costa, but I definiatly like the better gas mileage. So far I have averaged from 52mpg to nearly 59 mpg, over the first 2000 miles on my new bike,
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eddy
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PostSubject: Re: Speed vs RPM   Speed vs RPM I_icon_minitimeSun Aug 14, 2011 1:37 am

I think you can make easily a chart for your own scooter.

Put scooter on main stand and start engine.

Throttle to 20,30,40..mph and write down the rpm's .


The diameter of the drive pulley (front) is determinated by the rpm's of the engine.
The sliders don't see load, only rpm's.
You will be pretty close.
Althoug the real rear tire diameter will be less by the weight of the bike.
But not that much if pressure in tire is OK.


It's not a laboratorium methode.
Because rpm and speed gauges are not that accurate.

But you will have a good idea of the relation between rpm's and speed
OF YOUR scooter.
Stock parts ore not..., belt worn or not..no matter.

Eddy.
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BlackFly
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PostSubject: Re: Speed vs RPM   Speed vs RPM I_icon_minitimeSun Aug 14, 2011 4:56 am

eddy wrote:

Althoug the real rear tire diameter will be less by the weight of the bike.

Yes, the diameter also will e different by different tire brands and will decrease due to normal wear.
But it doesn't matter (in your case), because the speedsensor also only measures the RPM of the rear wheel and will calculate from this rpms the speed...
It only will matter if you use a GPS for speed measurement (but this is also not so accurate if you accelerate or brake) or an additional speedo and in both cases (GPS and additional speedo) you have to ride the bike.
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