accurate speedometer

triroketman

Supercharged
Joined
Aug 14, 2006
Messages
206
Location
Mount Carmel Illinois
You have probably hashed this out before, but I'm new.
I had the local constable check my speed and found that the Rocket Speedo is 5mph faster than I am really going. Have any of you experienced this and is there any way to correct it.
Thanks
Dave
 

ValknRocket

.020 Over
Joined
Sep 11, 2005
Messages
45
Location
Cleveland Ohio
Most of them read about 6% faster than you are going acording to my GPS. The Tuneboy will correct your speedo error aiong with many other benifits.
 

Pig9r

Living Legend
Joined
Mar 5, 2006
Messages
4,849
Location
Kansas City, MO USA
Yes it is a comman issue. Tuneboy has an option to change the wheel speed constant in the ECU. I think what Wayne from Tuneboy found was that there was about a 7% error (reading was too fast). I have corrected mine but have not verified the accuracy.
 

jefff1

.040 Over
Joined
Jun 28, 2006
Messages
52
:) Had the local police radar me on a number of runs and found I'm 5-7 mph fast....Just waiting for my Tuneboy key to get this straightened out and a couple of other things as well...
 

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