accurate speedometer

[triroketman]

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]

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]

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.

 

[sullyjones]

Corrected mine with tuneboy , spot on with gps now .

 

[jefff1]

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...