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RC51 Actual Top Speed

RC51 Actual Top Speed


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RC51 Actual Top Speed

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Old 06-07-2006, 3:12 PM
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RC51 Actual Top Speed
Has anyone actually ever found a place to hold an RC51 wide open for at least a half mile or so to see what the top speed is?

As I'm sure everyone knows, the theoretical top speed is about 170 mph but 130 HP aint gonna get you to 170 mph.

The reason I ask is because I'm switching to a 46 tooth rear sprocket (with a 15 front) and I think there's a good chance the bike will see 150 with this setup...

It should because my 2002 YZF/R6 got to 133 with my wife and I on it...a few years back - bone stock.

Troy Corser broke 200 mph in 1996 on a Ducati 916 at Daytona with a banzai qualifying engine and that engine was rumored to be about 180 hp.

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Old 06-07-2006, 3:24 PM
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Re: RC51 Actual Top Speed
You'll need more than 1/2 mile to see top speed. I thought I saw a magazine report some time ago that put it in the low 160mph range with stock gearing.
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Old 06-07-2006, 3:38 PM
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Re: RC51 Actual Top Speed
As per Sport Rider, the top speed is 163 for a 2000 model.

http://sportrider.com/bikes/146_perf...rs/index4.html
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Old 06-07-2006, 5:02 PM
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Re: RC51 Actual Top Speed
205 mph. Just watch out for cops in the air if you attempt it in Chicago...
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Old 06-07-2006, 5:07 PM
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Re: RC51 Actual Top Speed
I did see a post somehwere about the guy who received the "fastest" speeding ticket ever handed out. I forget where I saw it...

ought to make for a good laugh though...
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Old 06-07-2006, 6:58 PM
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Re: RC51 Actual Top Speed
46/15 will make your bike slower for any given revs
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Old 06-07-2006, 7:46 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by markten
46/15 will make your bike slower for any given revs
Than what?
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Old 06-07-2006, 9:01 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by abtech
Than what?
Than stock...

Here's a gearing calculator for those of you with Excel.
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Old 06-07-2006, 9:37 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by southpark460
Than stock...

Here's a gearing calculator for those of you with Excel.
well - I know I shouldn't post this and it's irresponsible as hell for a 53 year old man to do.. but I saw 138 tonight in 5th gear before backing off for safety reasons..

there was a lot more left - 15/41 gearing

she flat shifts real nice... I picked up an electric shifter and will get that installed next week. I just hate rolling off the throttle when I'm on it..
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Old 06-07-2006, 10:43 PM
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Re: RC51 Actual Top Speed
I have a 2004 that I saw 170 on the speedo a few times and it was still pulling hard I had to slow down for the turns,this was when it was still stock.
I have not tried this again since I put on the Hindle slipons and power commander.
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Old 06-07-2006, 10:54 PM
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Re: RC51 Actual Top Speed
Remember your speedo's going to be close to 8% off with stock gearing....
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Old 06-07-2006, 11:17 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by southpark460
Remember your speedo's going to be close to 8% off with stock gearing....
. . . and with 15/41 it will be off quite a bit more (roughly 10 percent over the base 8 percent error). My best guess is that an indicated 138 with that gearing is closer to 113 or so since you changed the overall gearing from 2.5 to 1 down to 2.74 to 1. (indicated - 18% speedo and gearing error).
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Old 06-07-2006, 11:35 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by southpark460
Remember your speedo's going to be close to 8% off with stock gearing....
We have some of those "This is your speed" speed detectors around here and my speedo seems to only read 3-4mph higher than those displays
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Old 06-08-2006, 7:43 AM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by 04RC51
We have some of those "This is your speed" speed detectors around here and my speedo seems to only read 3-4mph higher than those displays
wow - now that's putting our tax dollars to good use. we have one near me on a main road but it's right before an intersection....not a wise place to check your top speed, but I may use it for a speedo check at 50 or 60...
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Old 06-08-2006, 10:43 AM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by 04RC51
We have some of those "This is your speed" speed detectors around here and my speedo seems to only read 3-4mph higher than those displays
At what speed? The error percentage seems to get worse with speed...
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Old 06-08-2006, 10:58 AM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by southpark460
At what speed? The error percentage seems to get worse with speed...

The percentage is constant, the amount of speed error will increase with speed however. At 50 mph a 10% error is 5mph, at 200 mph that same 10%error now translates to 20 mph and so on, the greater the error the more it's wrong at higher speeds.
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Old 06-08-2006, 11:22 AM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by 04RC51
We have some of those "This is your speed" speed detectors around here and my speedo seems to only read 3-4mph higher than those displays
What is 8% of 50mph?
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Old 06-08-2006, 12:15 PM
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Re: RC51 Actual Top Speed
50MPH * .08 = 4 MPH
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Old 06-08-2006, 12:18 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by LUCIDDREAM57
50MPH * .08 = 4 MPH
yee haw!

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Old 06-08-2006, 12:28 PM
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Re: RC51 Actual Top Speed
hahaha, yea thats funny, I'm not going to reveal too much about me but lets just say I self taught my self everything I know from real world applications.
I didn't mix well with school.
It helps that i'm 1/2 japanese.

My girlfriend helps with the other half, she's very smert and is going for her docterate in analytica chem.
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Old 06-08-2006, 12:42 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by LUCIDDREAM57
50MPH * .08 = 4 MPH
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Old 06-08-2006, 1:51 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by LUCIDDREAM57
The percentage is constant, the amount of speed error will increase with speed however. At 50 mph a 10% error is 5mph, at 200 mph that same 10%error now translates to 20 mph and so on, the greater the error the more it's wrong at higher speeds.
I understand that a constant percentage error would equate to varying differences in speed for any given speed, but I've also seen where the percentage errors vary as well. I'm not sure if it has to do with the speedo sensor arrangement or what...
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Old 06-08-2006, 1:56 PM
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Re: RC51 Actual Top Speed
Hmmm, The only time i've seen it change would be when changing sprockets, do you mean a changing ratio without modding the bike itself??
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Old 06-08-2006, 1:57 PM
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Re: RC51 Actual Top Speed
p.s. Your yellow rc is purdy.
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Old 06-08-2006, 2:15 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by 04RC51
We have some of those "This is your speed" speed detectors around here and my speedo seems to only read 3-4mph higher than those displays
The Speed signs used by our local PD are programmed to turn of the LED display if the indicated speed exceeds a set limit. This is to prevent people from trying to see how fast they can go...
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Old 06-08-2006, 5:10 PM
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Re: RC51 Actual Top Speed
Quote:
Originally Posted by Red Rider
The Speed signs used by our local PD are programmed to turn of the LED display if the indicated speed exceeds a set limit. This is to prevent people from trying to see how fast they can go...
I thought they all just read: "Dayum!" when they got really high . . .
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Old 06-08-2006, 5:34 PM
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Re: RC51 Actual Top Speed
Quote:
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I thought they all just read: "Dayum!" when they got really high . . .
Thats good, i'm going to use that one day if you don't mind.
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