LawyerA
Parking Attendant
Posts: 15
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posted July 24, 2008 03:58 PM
Could someone compute my actual speed?
The other day after entering the interstate past alot of construction, I found myself with about a half mile of open space, so I dropped down into third, pulled a wheelie to about 110, and then tucked in with the throttle open for a while. Just before I had to slow down because of traffic, I looked at the speedometer, and it was sitting at 190-191. That is, at the very last hash mark without enumeration. This is the fastest I have ever went, but you all have informed me that the standard instrumentation is optimistic. With a 16 tooth front sprocket and a set of Michlien Pilot Powers on the bike, what would be a good calculation of my actual speed? I thought the speed limiter was supposed to kick in at 186 mph, but since it did not, I suppose I did not reach that speed. Your all's expert comments would be appreciated.
  
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stevewfl
Moderator
Posts: 27920
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posted July 24, 2008 04:02 PM
happy speedometer on the 14. my GPS showed it way of at speed. if you ride fast, it would serve you well to invest in GPS, or a speedohealer set accurately for your sprocket configuration.
____________
2010 Concours14
'08 R1 YAMAHA
ZX14 gone!
CBR600RR track bike
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shane661
Needs a life
Posts: 11494
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posted July 24, 2008 04:14 PM
 Edited By: shane661 on 24 Jul 2008 17:15
I'm going to "guess" that you were going around 160-165 mph. The gearing change alone accounts for 6% or so in speedo error, and you can add that to the error that is built-in from the factory.
Shane
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russ8526
Novice Class
Posts: 60
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posted July 24, 2008 07:49 PM
quote:
happy speedometer on the 14. my GPS showed it way of at speed. if you ride fast, it would serve you well to invest in GPS, or a speedohealer set accurately for your sprocket configuration.
so with a 16t front sproket what would be the correct setting on the speedo healer.
____________
2007 zx-14 Limited
Brocks Alien Head
BMC Race Filter
PClll w / Track Map
Flies Removed
16 T Front Sprocket
Speedohealer
Fender Eliminator
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russ8526
Novice Class
Posts: 60
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posted July 24, 2008 07:50 PM
quote:
quote:
happy speedometer on the 14. my GPS showed it way of at speed. if you ride fast, it would serve you well to invest in GPS, or a speedohealer set accurately for your sprocket configuration.
so with a 16t front sproket what would be the correct setting on the speedo healer.
I have been playing with mines but have not found the correct setting yet.
____________
2007 zx-14 Limited
Brocks Alien Head
BMC Race Filter
PClll w / Track Map
Flies Removed
16 T Front Sprocket
Speedohealer
Fender Eliminator
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flyboy
Pro
Posts: 1536
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posted July 24, 2008 08:23 PM
Edited By: flyboy on 24 Jul 2008 21:26
quote:
I'm going to "guess" that you were going around 160-165 mph. The gearing change alone accounts for 6% or so in speedo error, and you can add that to the error that is built-in from the factory.
Shane
That's about right. 4th gear is about 155-160 mph. Especially with 16 T. Sorry to deflate your speedometer. It was set by attorneys/engineers to keep us out of trouble. A speedohealer might help you in the future.
____________
'There's more living in five minutes flat-out on a bike than some men have in an entire life'.
"The World's Fastest Indian"
One fast red ZX-14,
Three World and four National Land Speed Records,
One faster red and white Cessna Turbo 210
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nczx14
Expert Class
Posts: 108
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posted July 24, 2008 08:30 PM
Edited By: nczx14 on 24 Jul 2008 21:31
If you go to this site http://www.healtech-electronics.com They are the maker of Speedohealer, and look around there is an estimater for you % of correction you need based on tire size and gearing. Their estimates are within .05% of what my actual GPS speed is.
____________
2K7 everything possible without going in the engine.
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fifth
Expert Class
The Magnificent Bastard
Posts: 303
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posted July 24, 2008 08:32 PM
My speedohealer was set at -11.5 for 16/41 gearing. I had it checked by radar at various speeds and it was spot on.
I don't recall what we set it to when I changed the back sprocket from 41 to 43....seems like it was either -14.9 or 15.9 maybe. I would have to check the bike.
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nczx14
Expert Class
Posts: 108
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posted July 24, 2008 08:41 PM
I think mine is on -14.8% geared 16-43
____________
2K7 everything possible without going in the engine.
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BobC
Pro
Posts: 1736
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posted July 25, 2008 04:19 AM
Edited By: BobC on 25 Jul 2008 05:31
My estimation: If the speedo was accurate (which it isn't) you would have been doing around180mph with a 16tooth sprocket. Take off the 7% or so for the optimistic speedo and you have 167mph.
Setting the Speedo Healer to -11.5% would be about right.
____________
Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
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russ8526
Novice Class
Posts: 60
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posted July 25, 2008 05:10 AM
is each bike different or what because i am still having problem setting mines. what are you guys putting in for your indicated value on your meter (odometer) and your reference (actual) value. and that's with the conversion mode set to none.
____________
2007 zx-14 Limited
Brocks Alien Head
BMC Race Filter
PClll w / Track Map
Flies Removed
16 T Front Sprocket
Speedohealer
Fender Eliminator
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fifth
Expert Class
The Magnificent Bastard
Posts: 303
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posted July 25, 2008 10:18 AM
just enter the -11.5% directly in.....
the speedohealer website lets you put the percent in and it gives you step by step instructions...the important part is the last step to make sure the value you inputed actually saves in the speedohealer. If it doesn't, you just wasted time and your speedo doesn't read right.
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LawyerA
Parking Attendant
Posts: 15
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posted July 25, 2008 01:15 PM
Many thanks to all of you. I knew that the speedo was optimistic, but did not think it was
over 10%. This still does not answer why the speed limiter did not kick in, unless the bike
somehow knows it is actually not exceeding 186 mph/300kmph.
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