www.CVOHARLEY.com

Please login or register.

Login with username, password and session length
Advanced search  

Author Topic: RPMs and Speedo accuracy  (Read 2135 times)

0 Members and 1 Guest are viewing this topic.

skreminegul07

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 2446
  • FLHRSEI.ORG
    • MA


    • CVO1: 2017 Indian Chieftain Limited
RPMs and Speedo accuracy
« on: June 27, 2010, 08:58:50 PM »
Just as the NASCAR drivers determine pit road speed, I am wondering about the calibration /accuracy of the speedometer on my FXR4.  I did replace the speed sending unit last month, but they are all the same as far as i Know.  Factory size tires, etc.
At 3000 RPM, the speed read 50MPH, but I was passing cars on the highway.  No windshield and I ride the Street Glide a lot so I've apparently lost the "in the wind feel."
Anyone know what 60 MPH would be in RPMs? 50 MPH?
On my street glide 65 is 3000 RPM, so this seems wrong.

Thanks
Logged
Any day on the bike is a good day.

jmhenrie

  • Full CVO Member
  • ***
  • Offline Offline
  • Posts: 113
  • expensive oil change

    • CVO1: 2007 screaming eagle electra glide Gone
    • CVO2: 2010 screeming Eagle electra glide cvo limited black
    • CVO3: 2012 cvo electra glide Electic Orange/black
Re: RPMs and Speedo accuracy
« Reply #1 on: June 27, 2010, 10:58:14 PM »
 i would borrow a GPS and check  your own bike.  on my 3 different bikes i have always found that Harley's read high on the speedometer
cheers
mike
Logged

ltank

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1214
    • LA

    • CVO1: 2000 FXR4 S&S V111, CustomS.S. 2-1 exhaust, Primo-Rivera OD 6 speed, 49mm Custom Front End Ohlins 30mm Fork cartridges , Hyperpro Shocks, Barnett Scorpian Clutch
    • CVO2: 1983 88" Shovelhead Won the World of Wheels 1985 Sept 85 Issue of Hot Bike Mag
    • CVO3: 1989 FXRS, 1990 Custom 100" Shovelhead/ EVO
Re: RPMs and Speedo accuracy
« Reply #2 on: June 29, 2010, 07:00:42 PM »
Hi,
 I have a 2000 FXR4. In 5th gear 3,000 rpm I am am just over 70 mph. Stock gearing speedo/tach.
Ltank
Logged

skreminegul07

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 2446
  • FLHRSEI.ORG
    • MA


    • CVO1: 2017 Indian Chieftain Limited
Re: RPMs and Speedo accuracy
« Reply #3 on: June 30, 2010, 09:11:35 AM »
Great, Thanks.  I found a link to calculate that and determined very similar results.  Field test results are worth more than calculated. 
Logged
Any day on the bike is a good day.

scobar44

  • Newbie
  • *
  • Offline Offline
  • Posts: 47

    • CVO1: 1999 FXR2, Arresting Red
Re: RPMs and Speedo accuracy
« Reply #4 on: July 01, 2010, 02:08:18 PM »
On my stock FXR2, at 2500 rpm I'm running about 60 mph.
Logged
Scott

ltank

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1214
    • LA

    • CVO1: 2000 FXR4 S&S V111, CustomS.S. 2-1 exhaust, Primo-Rivera OD 6 speed, 49mm Custom Front End Ohlins 30mm Fork cartridges , Hyperpro Shocks, Barnett Scorpian Clutch
    • CVO2: 1983 88" Shovelhead Won the World of Wheels 1985 Sept 85 Issue of Hot Bike Mag
    • CVO3: 1989 FXRS, 1990 Custom 100" Shovelhead/ EVO
Re: RPMs and Speedo accuracy
« Reply #5 on: July 03, 2010, 09:21:58 PM »
I double checked my FXR4 5th gear 3000 rpm on level ground 78 mph my wifes truck confirms within 2 mph I was going to take photo of speedo/tach but too awkward
Ltank
Logged

JamesButler

  • Full CVO Member
  • ***
  • Offline Offline
  • Posts: 143
Re: RPMs and Speedo accuracy
« Reply #6 on: July 05, 2010, 07:36:18 PM »
Got these results from my FXR3 today:
2500 rpm @ 60 mph  :)
2800 rpm @ 70 mph  :D
3200 rpm @ 80 mph  ;D
3800 rpm @ 90 mph  :orange:
Too much traffic to get up any higher.  8)
Logged

skreminegul07

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 2446
  • FLHRSEI.ORG
    • MA


    • CVO1: 2017 Indian Chieftain Limited
Re: RPMs and Speedo accuracy
« Reply #7 on: July 07, 2010, 07:12:51 PM »
Thanks all for the info.
Logged
Any day on the bike is a good day.

JamesButler

  • Full CVO Member
  • ***
  • Offline Offline
  • Posts: 143
Re: RPMs and Speedo accuracy
« Reply #8 on: July 09, 2010, 08:54:31 AM »
You're welcome,  :2vrolijk_21: Didn't record 50 mph because I'm in 4th gear.
Logged
 

Page created in 0.13 seconds with 21 queries.