Calibrating Spedo?

[SexyCelica]

Hi All....I just put some indiglos on my celica yesterday and today when i was driving i noticed it was off by about 5mph...i did i search, but isn't there any other way of calibrating it then driving at the same speed as a car next to you and place the needle wherever their needle is? I remember reading somewhere that you can put the key in the ACC position for 15secs then turn it off or something like that?

[buckeye23]

Start your car up, let it run for about 10-15 sec just to be safe. The speedo should be at zero after that time. Then just put the needle back at 0 mph and you're set.

[Baldhead_J]

If you change total wheel diameter can the dealer recal the speedmeter or are we just screwed.

[buckeye23]

Depending on what tires you get, size, etc... your speedometer could be off by a couple MPH above or below what your speedometer says.

With my tires, Kumho Supra 712s...215/40/R17...actually add about 1 mph to my speed. So if my speedometer says 60, I'm actually going 61.

The dealer will probably just do what I described before. Start the car, let it run so everything calibrates to 0, then slap the needle back on.