Speedometer differences???
Thread Starter
|
Senior User
Joined: Feb 2004
Posts: 438
Likes: 0
From: Ormond Beach
Speedometer differences???
Why the differences between the two speedometers?
Neighbor and myself both have Ford F250's. His is an 01 and mine an 04. Both 4x4 - with auto tranny's. Both had stock 31 inch tires. Both lifted now with 37 inch tires - same brand.
His speedometer is off 15% and mine is only off 12%. What would cause that???
Note: speeds were accurately recorded with GPS units for comparisons.
Neighbor and myself both have Ford F250's. His is an 01 and mine an 04. Both 4x4 - with auto tranny's. Both had stock 31 inch tires. Both lifted now with 37 inch tires - same brand.
His speedometer is off 15% and mine is only off 12%. What would cause that???
Note: speeds were accurately recorded with GPS units for comparisons.
Senior User
Joined: Mar 2004
Posts: 126
Likes: 0
From: Reno, NV
Hmm gps units, well I wouldn't really count on that, but umm my first guess is rear axle ratios or different trannies? Different size lift? Well i guess that wouldn't matter. Were they exactly the same before, did you pace them together side by side on the road. Really though, 3% difference.
And judging by your other posts I would be confused...
And judging by your other posts I would be confused...
Last edited by Connect; May 1, 2004 at 06:43 AM.
Post Fiend
Joined: Apr 2002
Posts: 5,438
Likes: 11
From: IN FRONT OF YOU
No speedo is "certified" correct other than police crussiers, there will be some differences even between identical vehicles.
The only thing that will effect your speedo is tire size,... gear changes will not, lifts will not, tranny will not.
The only thing that will effect your speedo is tire size,... gear changes will not, lifts will not, tranny will not.
Thread Starter
|
Senior User
Joined: Feb 2004
Posts: 438
Likes: 0
From: Ormond Beach
Originally Posted by Yeti
No speedo is "certified" correct other than police crussiers, there will be some differences even between identical vehicles.
The only thing that will effect your speedo is tire size,... gear changes will not, lifts will not, tranny will not.
The only thing that will effect your speedo is tire size,... gear changes will not, lifts will not, tranny will not.
For those who are unfamiliar with GPS tracking and speed measurment my particular unit is a WAAS activated 3D Garmin Map 76 which is extremely accurate. I have compared speed measurments against radar, laser and calibrated speedometers and it was always exactly on!
