Speedo Miscalculation - Wrist Twisters
 
Thread Tools Display Modes
post #1 of 12 Old 03-20-2013, 06:50 PM Thread Starter
Ride with grace.
 
Devin4242's Avatar
 
Join Date: Mar 2012
Location: Fort Worth
Posts: 126
Rep Power: 1
 
Speedo Miscalculation

OK, I've searched through the threads, and while I've seen comments on speedometer innacuracy on the 919 (corrected by a 17/44 sprocket upgrade), I have yet to find details on what that innacuracy is, exactly. The only thing I notice is that I think my registered speed on the speedo may be more than what I'm actually doing. Can anyone enlighten me? My speedo says 37 and the oft-seen radar warning signs, the portable ones they put in school zones, generally, indicates 33 range....

Thanks in advance!

Devin4242 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old 03-20-2013, 08:12 PM
Tirone Choolaces
 
marylandmike's Avatar
 
Join Date: Aug 2007
Location: USA
Posts: 11,120
Rep Power: 1
 
Garage

Awards Showcase
Wrist Twisters Event Attendance Donation Donation 
Total Awards: 3

With stock gearing my speedo read high vs GPS. At 60 mph on the GPS my speedo read 65 mph. Seemed a little more accurate at lower speeds.

marylandmike is offline  
post #3 of 12 Old 03-20-2013, 09:36 PM
(-(-(-(-(- -)-)-)-)-)
 
andrewebay1's Avatar
 
Join Date: May 2009
Location: Seattle, WA
Posts: 6,883
Rep Power: 1
 
The faster you go, the more inaccurate. With the 17/44, at 72mph on the gauges the GPS shows 70.

My classified(s):
Nothing at the moment

----------------
------------
---------
------
---
- '96 Race-retired GSXR 750 (Sold)
- '01 RC51 SP1 (Sold)
- '03 919

"Security is mostly a superstition, it does not exist in nature: avoiding danger in the long run is no safer than outright being exposed. Life is either a daring adventure or nothing."-Helen Keller
andrewebay1 is offline  
 
post #4 of 12 Old 03-21-2013, 06:00 AM
"CERTIFIABLE"
 
Ken Phenix's Avatar
 
Join Date: Sep 2011
Location: Southeast Texas
Posts: 1,954
Blog Entries: 1
Rep Power: 1
 
Garage

Awards Showcase
Motorcycle Picture Game Award Extraordinary Ride Extraordinary Ride 
Total Awards: 3

On my first road trip I compared the 919's cluster to a gps speedo ap and found the speedo reads a constant 11% high while the odometer registers only 3% high with stock gearing.
Ken Phenix is offline  
post #5 of 12 Old 03-22-2013, 05:47 AM Thread Starter
Ride with grace.
 
Devin4242's Avatar
 
Join Date: Mar 2012
Location: Fort Worth
Posts: 126
Rep Power: 1
 
Awesome, thanks. Sounds like the 17/44 helps, though, and from what I hear softens the upper range buzz. Which I don't mind generally, but on longer trips it might be nice to calm down a bit. Or slow down, which is hard to do....

Devin4242 is offline  
post #6 of 12 Old 03-22-2013, 06:09 AM
Milites Gregarius
 
oldman's Avatar
 
Join Date: Jan 2013
Location: Lufkin
Posts: 157
Rep Power: 1
 
Quote:
Originally Posted by Devin4242 View Post
Awesome, thanks. Sounds like the 17/44 helps, though, and from what I hear softens the upper range buzz. Which I don't mind generally, but on longer trips it might be nice to calm down a bit. Or slow down, which is hard to do....
I just put a 17 tooth on front on my 2007 919. The chain and back sprocket are stock still. The speedometer was off 7 miles per hour at 70 when compared to my GPS when I had the 16 tooth on front sprocket. It is as near as I can tell 1-1/2 - 2 mph off now (shows 68-69 on bike speedometer when GPS shows 70.) The Bike Still work great for me from dead stop all the way thru gears and is a little less "buzzy ". It is tacking approximately 400 rpm less at 70 mph. I like it better . Just my 2 cents..... Lew

oldman is offline  
post #7 of 12 Old 03-22-2013, 09:17 AM
LDH
Test Rider
 
LDH's Avatar
 
Join Date: Feb 2006
Location: by the ocean
Posts: 4,327
Rep Power: 1
 

Awards Showcase
Trackday Recognition Referral Award 
Total Awards: 2

With stock gearing the bike reads approximately 7-8% (depending on rear tire size) optimistic at freeway speeds.

LDH is offline  
post #8 of 12 Old 03-22-2013, 09:51 AM
Cornicen
 
Join Date: Feb 2008
Location: St. Louis , MO
Posts: 573
Rep Power: 1
 
Shells 919 at 80 on the GPS was reading 92 on the speedo

Bobby is offline  
post #9 of 12 Old 03-22-2013, 10:18 AM
Burn-em Upus Asphaltus
 
rickard919's Avatar
 
Join Date: Apr 2008
Location: Calgary, Canada
Posts: 3,802
Rep Power: 1
 

Awards Showcase
Donation 
Total Awards: 1

Quote:
Originally Posted by Bobby View Post
Shells 919 at 80 on the GPS was reading 92 on the speedo
You abused her bike by going that fast? Sheesh Bobby!

Spoiler:

rickard919 is offline  
post #10 of 12 Old 03-22-2013, 10:48 AM
rmb
Let's go!
 
rmb's Avatar
 
Join Date: Aug 2009
Location: Sussex Couty NJ
Posts: 7,647
Rep Power: 1
 

Awards Showcase
Wrist Twisters Event Attendance Wrist Twisters Event Attendance Wrist Twisters Event Attendance Wrist Twisters Event Attendance 
Total Awards: 9

Quote:
Originally Posted by Bobby View Post
Shells 919 at 80 on the GPS was reading 92 on the speedo
This is why you get in trouble...

rmb is offline  
post #11 of 12 Old 03-23-2013, 10:10 AM
Cornicen
 
Join Date: Feb 2008
Location: St. Louis , MO
Posts: 573
Rep Power: 1
 
There is a slight chance that HER Speedo may have seen the other side of triple digit and that with no proof that she could come up with could have been from a quarter mile street run with 5 miles on her bike

Bobby is offline  
post #12 of 12 Old 03-23-2013, 01:58 PM
Le So Cal Troll
 
nd4spdbh's Avatar
 
Join Date: Sep 2009
Location: So Cal
Posts: 5,766
Rep Power: 1
 
Quote:
Originally Posted by LDH View Post
With stock gearing the bike reads approximately 7-8% (depending on rear tire size) optimistic at freeway speeds.
yup this is what i found... about 8% high (70 indicated, 65 actual) but odometer is spot on. Typical of Japanese bikes. Personally i like it this way... its saved me from a few tickets... and knowing the actual mileage i have traveled is nice.

nd4spdbh is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Wrist Twisters forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome