My speedo has always been off a fair amount, didn't just how much until recently when I finally upgraded to a smartphone. Using a GPS based speedometer app, I found I am off by about 14%. At an indicated 70mph, the app displays 60.
This is on stock wheels with 205/60R13 tires. Given that the stock tires size is 185/70R13, my speedo error compared to stock should be closer to 1%.
So, what causes so much error? Could the transaxle be from something else? It sure looks stock, and had the studs on top for the smog stuff Scorpions had (until I removed them). Maybe the speedo drive gear is incorrect?
Thoughts and ideas welcome.
(cross-posted from Lancisti)
This is on stock wheels with 205/60R13 tires. Given that the stock tires size is 185/70R13, my speedo error compared to stock should be closer to 1%.
So, what causes so much error? Could the transaxle be from something else? It sure looks stock, and had the studs on top for the smog stuff Scorpions had (until I removed them). Maybe the speedo drive gear is incorrect?
Thoughts and ideas welcome.
(cross-posted from Lancisti)