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When I bought my project Integra LS, it came with good tires on the stock alloy 14" wheels which I have no desire to replace right away. However the PO put 185/65R14s on it instead of the called for on the door jam sticker 185/60R14s for whatever reason. This taller aspect ratio tire is throwing my speedo off right at 3 mph which also runs the miles up a little faster. Speedo at 80 mph car actually only going roughly 77 mph. This verified by my Garmin GPS. This is also true at slower speeds across the board.
What level of scanner tool would it take to re-calibrate/re-program the speedo (VSS?), playing with it till it is reading correctly? Then if I decide to upgrade my wheels to 15 or 16s in the future, calibrate the speedo to read correctly with whatever tires I end up with?
I posed this question over on ETCG and the response was basically live with it unless I was able to dig in deep. I have a friend in the car repair business who might have a professional level scanner tool that could go for that deep dig. I can live with what I have now but I'd still like to know what it would take to do this for future reference.
I will be very surprised if there's anything you can do to correct this.
Snap-On scan tools will not. Maybe a factory tool will.
on a gear driven vss you can change the gear when change ratios, but your car has a magnetic pick up.
If you find a tool capable of that correction, please let us know.
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