1984 Spider. I checked my Speedo this morning against a GPS and it is off across the spectrum. For example when my speedo reads 67 I am actually doing 60! Any ideas gentlemen? Stock size tires BTW.
Pretty sure it has not, it is a low mile unmolested car and it revs a lot lower at speed than my 4.55 1978 did~Do you think that your original 4.1 axle may have been swapped for a 4.55? That would account for the 10% error.
True~!!! But now I KNOW so the equation has changed!they are never deadly accurate at the best of times.
reading 67 at 60 is not bad tbh! (think of all the speeding tickets it will save you from)
Might be!~~!Think it that STUPID DOT box under the hood. Gonna order a regular speedo cable and bypass that POS. My 82 is bad as well. It's doing the same exact thing.
Leave it alone. You'll impress your friends, and it'll keep you out of trouble.0
I have a 1600 diff in my 1750 spider...it's not even close to being correct, but it looks like I'm flying even at 60mphI need a speedo that reads a little high to keep my license. I wouldn't fix this myself. Actually what I do now is I use a GPS and the speed it is saying and set the cruise control ... oops yeah my GTV does not have that.
To me speedo's are always a rough idea thing ... but then I've had lots of tickets