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Old 04-06-2011, 07:32 AM   #1
derekvercher
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GPS dont lie

Ok. I've got a super sweet 1998 CBR 600 F3. Just rolled over 12k on her. Size 142 jets across the crabs. Full Fuzzy exhaust with the k&n filter. I did go down 1 up 2 in the back. Anyway to the point. I downloaded an app for recording top speed on my gps. Anyway the speedo said 175 but the real speed was just 148. That sucks. I've heard the speed is off a lot but 27 mph. That's alot.
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Old 04-06-2011, 07:38 AM   #2
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Sounds about right. I have 1 down on the front and it's about 8 mph off. Add 2 more teeth and ur at 24-25 mph off. And its an older bike as well.
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Old 04-06-2011, 07:38 AM   #3
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What was your tach reading and what is redline?
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Old 04-06-2011, 07:40 AM   #4
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Quote:
Originally Posted by derekvercher View Post
Ok. I've got a super sweet 1998 CBR 600 F3. Just rolled over 12k on her. Size 142 jets across the crabs. Full Fuzzy exhaust with the k&n filter. I did go down 1 up 2 in the back. Anyway to the point. I downloaded an app for recording top speed on my gps. Anyway the speedo said 175 but the real speed was just 148. That sucks. I've heard the speed is off a lot but 27 mph. That's alot.
It's off a percentage based on gearing, not a fixed number. The faster you go, the further off the speedo is. Also, most japanese bikes in that era (I've heard they're closer nowadays) read about 8% high stone stock. I hope those speeds were done on a racetrack.
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Old 04-06-2011, 07:40 AM   #5
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It was right on it. The rev limiter never kick in. But it was close.
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Old 04-06-2011, 07:40 AM   #6
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man, that speedo is waaaay off.
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Old 04-06-2011, 07:42 AM   #7
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What did you expect with -1+2 gearing? Those bikes only ran in the mid 150s with stock gearing.....I actually think with -1+2 you did well to run 148... Yes the speedos will read off by a crazy amount if its driven off of the counter shaft and you run -1+2... Although I thought on a 98' the speedo would still run off of the front wheel, which means gearing changes wont affect its accuracy.....unless its just that far off from the factory...(which I doubt)..

I always wanted a Smokin Joes CBR600.....
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Old 04-06-2011, 07:47 AM   #8
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The speedo is internal. It's not at the wheel. And I was expecting to be running around 155ish.
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Old 04-06-2011, 07:49 AM   #9
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According to this site, with stock gearing top speed at 12K RPM is 150.9
With your combination it would be 134.6

www.gearingcommander.com
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Old 04-06-2011, 08:02 AM   #10
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The gps said 148 and like I said it don't lie. I'll be more than happy to run it again and post a pic of the results.
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Old 04-06-2011, 08:05 AM   #11
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Quote:
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The gps said 148 and like I said it don't lie. I'll be more than happy to run it again and post a pic of the results.
The top speed I posted for you was at 12,000 RPM. What's the redline on your bike?
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Old 04-06-2011, 08:07 AM   #12
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At 13K rpm your set up would give you a top speed of about 145.8
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Old 04-06-2011, 08:09 AM   #13
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Redline is 14k
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Old 04-06-2011, 08:11 AM   #14
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its about a 15% difference, show 100 and you're doing 85.
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Old 04-06-2011, 08:12 AM   #15
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At 14K stock gearing gets you about 176.1 mph
Your set up gets you 157.1 mph
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Old 04-06-2011, 08:18 AM   #16
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See that's what I was expecting about 155ish. I'm gonna run it again today and see if I ride it longer at top speed to see if gps reads different.
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Old 04-06-2011, 08:19 AM   #17
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Quote:
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At 14K stock gearing gets you about 176.1 mph
Your set up gets you 157.1 mph
The difference is probably from the tire spinning.
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Old 04-06-2011, 08:20 AM   #18
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That's assuming you have stock sized tires
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Old 04-06-2011, 08:20 AM   #19
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Quote:
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See that's what I was expecting about 155ish. I'm gonna run it again today and see if I ride it longer at top speed to see if gps reads different.
great idea
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Old 04-06-2011, 08:21 AM   #20
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