Speedometer Not true to speed

Reply Subscribe

Thread Tools

Search this Thread

May 30, 2020 | 08:05 PM

MiddleshoolJD

Thread Starter

Member

Joined: Feb 2020

Posts: 34

Likes: 0

Speedometer Not true to speed

1999 f150 (265/70/16)... trucks reading 5 mph faster than my Actual speed... my Q is what size inch tire should I program my superchip?so my truck will read true to speed.. thanks for the help
(I have it set for a 31 inch tire)

Last edited by MiddleshoolJD; May 30, 2020 at 09:52 PM.

May 30, 2020 | 09:59 PM

glc

Senior Member

Joined: Dec 2006

Posts: 43,526

Likes: 817

From: Joplin MO

You will need to experiment. Go up an inch at a time. Note that by design, the factory calibration is 2 mph high at 60.

May 30, 2020 | 10:03 PM

Roadie

Senior Member

Joined: Jan 2002

Posts: 5,994

Likes: 221

From: Wilmington,NC

According to tirerack, the diameter of your tire is 30.4". 27.87" would correct the speedometer at 55mph.

Last edited by Roadie; May 30, 2020 at 10:10 PM.

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last