Speedometer off BAD...
#1
Flex
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Join Date: Jan 2003
Location: alabama(us)
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Speedometer of BAD...
just put 18" wheels on my 88 convert and now the speedometer appaer to be way off. do i need to get another speedometer cable or something? what can be done done to get it back into accuraccy? i put on 18" x 7.5 wide with 235/40/18 tires....
Last edited by carlosmck; 12-02-06 at 09:23 AM. Reason: spell
#3
Lives on the Forum
According to my chart, your tire size is only about 2% difference off from stock...
http://fc3spro.com/TECH/MODS/RT/tires.htm
This shouldn't be that big of a deal...
How do you know your speedo is off?
Are we talking about 10mph+???
-Ted
http://fc3spro.com/TECH/MODS/RT/tires.htm
This shouldn't be that big of a deal...
How do you know your speedo is off?
Are we talking about 10mph+???
-Ted
#4
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iTrader: (7)
I'm with Ted, it those tires should make much of any difference. You need to find a way of testing it. Either drive next to a friend whos speedo is working, or find one of those "your speed is" things. I've also heard you can get a cop to test it with his radar gun, but I don't want to try it.
Also, my speedo is off even with the stock tire size if that makes any difference.
Also, my speedo is off even with the stock tire size if that makes any difference.
#5
My speedo is about 4-5 MPH off. So say my speedo says im doing 45, im doing about 40. This is with stock 14" wheels
The way i know this is from every single digital speed sign the cops put out, always tells me the same thing.
I think there is a way to calibrate it but im not to sure how... maybe im thinking of the tachometer. I have read a writeup online some where.
The way i know this is from every single digital speed sign the cops put out, always tells me the same thing.
I think there is a way to calibrate it but im not to sure how... maybe im thinking of the tachometer. I have read a writeup online some where.