CRAZY FAST!!!! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Your Other Rides: Pics & Videos Post your pictures of your non-GM vehicles. Also discuss mechanical problems regarding your non-GM (Car vids not yours should be in the lounge)

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Old 04-29-2004, 10:10 PM   #11
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Quote:
Originally Posted by randman1
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Originally Posted by jwikoff00
The first one is a little unbelievable. It certainly doesn't look like 200 mph to me.
I had a buddy'* ZX-11 up to 174 as indicated on the speed-o. With the error produced at higher speeds as the wheel increases in diameter I estimate it was actually around 155. The grass and trees along side the road were a dull green blur and my head felt like it was coming off of my shoulders.

I too have a difficult time believing the speed in the first video wasn't somehow rigged.
If the tire increased in diameter, you'd be going faster than the speedo showed.
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Old 04-29-2004, 10:30 PM   #12
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Quote:
Originally Posted by jwikoff99
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Originally Posted by randman1
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Originally Posted by jwikoff00
The first one is a little unbelievable. It certainly doesn't look like 200 mph to me.
I had a buddy'* ZX-11 up to 174 as indicated on the speed-o. With the error produced at higher speeds as the wheel increases in diameter I estimate it was actually around 155. The grass and trees along side the road were a dull green blur and my head felt like it was coming off of my shoulders.

I too have a difficult time believing the speed in the first video wasn't somehow rigged.
If the tire increased in diameter, you'd be going faster than the speedo showed.
Something is F'ed up then cause there'* no way in hell that I was going over 174mph. I would have left a fecal trail all over I-91.
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Old 04-29-2004, 10:32 PM   #13
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damn. got balls?
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Old 04-29-2004, 10:51 PM   #14
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Quote:
Originally Posted by big_boss2010
damn. got balls?
Certainly not THAT BIG!

Quote:
With the original Dunlop D-87 (185-60) tires I was observing that the speedometer would read about 3 mph high at an indicated 60 mph and about 10 or 12 mph high at an indicated 120 mph (actual speed closer to 110). Currently, I am running 195-60/14 AVS-I and the errors observed are less. Basically, the error goes up geometrically. I am not sure why.
Somebody more mathematically inclined than I has put some thought into this phenomenon. This might explain it a little. I.m still scratchin' my head though.
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Old 04-29-2004, 11:19 PM   #15
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the second video is BAD A$$... that bike is 100% the real deal and the driver cannot even dip into it below 120mph
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Old 04-29-2004, 11:56 PM   #16
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Yea... I think the first video is clearly rigged....
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Old 04-30-2004, 12:05 AM   #17
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Quote:
Originally Posted by randman1
Quote:
With the original Dunlop D-87 (185-60) tires I was observing that the speedometer would read about 3 mph high at an indicated 60 mph and about 10 or 12 mph high at an indicated 120 mph (actual speed closer to 110). Currently, I am running 195-60/14 AVS-I and the errors observed are less. Basically, the error goes up geometrically. I am not sure why.
Somebody more mathematically inclined than I has put some thought into this phenomenon. This might explain it a little. I.m still scratchin' my head though.
Say the tires are 1.1 times the diameter of stock. Then the bike would be going 1.1 times the speed indicated. So 100 shown would be 110 mph actual.

A 195-60 tire is taller than a 185-60 tire. First number being tire width in millimeters, second being the sidewall heigth divided by the width. So keeping the same sidewall ratio with a wider tire makes the tire diameter larger, because the sidewall is taller.

So this guy you quoted had a speedometer reading higher than actual speed, got taller tires, and now his speedometer is more correct.
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Old 04-30-2004, 09:07 AM   #18
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Quote:
Originally Posted by jwikoff99
Say the tires are 1.1 times the diameter of stock. Then the bike would be going 1.1 times the speed indicated. So 100 shown would be 110 mph actual.

A 195-60 tire is taller than a 185-60 tire. First number being tire width in millimeters, second being the sidewall heigth divided by the width. So keeping the same sidewall ratio with a wider tire makes the tire diameter larger, because the sidewall is taller.

So this guy you quoted had a speedometer reading higher than actual speed, got taller tires, and now his speedometer is more correct.
I believe the idea here is not so much tire size as it is the optimistic error that is supposedly built into typical motorcycle speedometers. I used my abacus and your math is correct, but I'm sure that we are missing many variables that add to the discrepancies.

The bottom line is, when I was traveling around 155 as measured by my hinny-dyno, the terrain was wizzing by at a greater rate than shown in the video.

As for the other stuff, feel free to read all about it and you can give us all math lesson. http://www.se-r.net/electrical/top_speed_speedo.html
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Old 04-30-2004, 02:40 PM   #19
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Other variables? Like the manufacturer making you think you're going really fast?
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Old 05-02-2004, 06:07 AM   #20
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either way, anyone going 100 on a bike is suicidal IMO. I dont like doing it in a CAR, much less with nothing around me. But then again ive never driven a moto. At least the guy had a helmet...not that it would help at 100+
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