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Discussion Starter #1
Use this utility to determine your actual speed based on RPM, not the speedometer. It has the ability to determine speeds in any gear with any combination of sprockets and tire sizes.

ZX6R.com Speed Calculator
 

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that is way too cool, according to this my top speed "should" be 171 mph! WOO HOO! move b*tch get out the way!

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Yellow/Blk 2001 ZX-6R
Blk/Blk 2003 Acura CL-S 6 Speed
 

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what is your tire size and gear ratio you are using?

btw...should that be rear tire size or front tire size?

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Yellow/Blk 2001 ZX-6R
Blk/Blk 2003 Acura CL-S 6 Speed
 

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This is the coolest thing ever.

I wonder if there is a calculation so you can see what effect changing the front sprocket would have on 1/4 mile times. Any Ideas?
 

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Discussion Starter #7
Originally posted by tommyboynjataol

I put in 14,400 RPM and top speed was 189.59 in 6th
????
This is a theroetical maximum. It assumes no drivetrain slippage and that you could get 14,400 in 6th. Also, the tire height computation is crude. Look at the difference between the base and 1/4" growth speeds. Much better to use a real measurement.

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-gary
 

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Discussion Starter #8
Originally posted by hammer

This is the coolest thing ever.

I wonder if there is a calculation so you can see what effect changing the front sprocket would have on 1/4 mile times. Any Ideas?
Quickness depends so much on the launch and other factors like weight, atmospheric conditions, surface conditions, power curves, blah blah blah, it would be almost impossible to predict that reliably. On my paycheck anyway.

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-gary
 

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im stupid...help i dont get waht to do[V]? my bike is a 01 stock sprockets, dunlop 180/55/17...is this like how fast can my bike supposedly go or at certain gears?

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"I love ninjas with every part of my body, including my pee pee."
 

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Discussion Starter #11
Originally posted by arturo3rd

im stupid...help i dont get waht to do[V]? my bike is a 01 stock sprockets, dunlop 180/55/17...is this like how fast can my bike supposedly go or at certain gears?
It will calculate your speed according to your gearing and indicated RPM. Handy for determining top speed (as most seem to do) and actual speed after a gear change.

Theoretically, your bike would pull 183.71 @ 14,500 in 6th.

If you dropped your gears to 14/42, it would pull 163.3, but your speedo would say 180+ or something.

I was thinking of working on it some more to make it more of a "what if I went to this gear" calculator. Put in the speed and gears you want, and it will give you the RPM it would run.

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-gary
 

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In real life (on a dyno) my '03 pulled 160 mph (exactly)for a top speed. It showed 187 on the speedo. But this didn't factor in wind resistance either and the fact that my bike won't be stock for long.
 

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Hmmm... This is cool.. I bought the bike used, with the guy already doing a sproket change.. I never knew how fast/slow I was really going... I had to take off the front cover, but finally found that he had a 15/43. I did all the readings with it topping out at 165 going [email protected] (never going to actually do that).

I doubt that I will be able to remember all of these combinations.. what else can I use? Some people are saying that they use GPS.. does this give you speed??
 

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A GPS will give you an acurate speed reading, and plot the course that you have taken. And they are dead accurate.

Gareth
 

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Originally posted by ZX636Skiv

In real life (on a dyno) my '03 pulled 160 mph (exactly)for a top speed. It showed 187 on the speedo. But this didn't factor in wind resistance either and the fact that my bike won't be stock for long.
I dont understand about the wind resistance... If there is too much wind resistance then the bike wont get to 14,500 (or your red line). On a perfect day, your bike hits your red line in 6th gear, wouldnt that still be 160mph.

My point is that, if the bike is at red line, on the freeway in 6th gear...wouldnt that be the same mph if on a dyno with no wind resistance at red line in 6th gear.
 

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Discussion Starter #18
Originally posted by maxxxMy point is that, if the bike is at red line, on the freeway in 6th gear...wouldnt that be the same mph if on a dyno with no wind resistance at red line in 6th gear.
I've yet to see anyone that can get to redline on an unmodified 6R. For that matter, I haven't even heard of a modded bike doing it. The power it takes to overcome wind resistance increases exponentially with speed. That's why a ~160 horse 12R can only pull 20mph more than your ~100 horse 6.

Modding within reason, for those that were about to post pics of a 220 horse blown and slammed 6.
 

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I regeared my 600 to 14/43, I will take her out this week and wind her up. Ive been 170-175 (on speedo) and still had a little left, but didnt find myself standing still at one speed, was still climbing, that was with 15/40 and 14/40. I just put the 43 tooth on this week. I feel that hitting 14,000-14,500, anywhere in that area can be achieved, I will pay more attension to tach instead of speed.
 
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