2010 Infiniti G35 Speed

Tiny
AFNJR
  • MEMBER
  • 2010 INFINITI G35
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I noticed that my daughter seemed to be driving to fast while coming back from a family reunion. I was behind her and I was going 70 and she was way out in front of me. When I asked her she said she was running between 65 and 70. When I gave the car to her she insisted on putting a different size tire and wheel on it than was on it from the factory. I took the car and had the speedometer calibrated and it is 11 mph off. At 55 mph by the speedometer the car is traveling 66 mph. Is there any way to correct this problem before someone gets a speeding ticket or worse than that.
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Monday, September 1st, 2014 AT 4:35 PM

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Tiny
CARADIODOC
  • EXPERT
Whoever calibrated the speedometer entered some wrong numbers. Most commonly the tire size and axle ratio have to be entered. Sometimes oddball tire sizes aren't listed on the scanner's drop-down menu, especially when installing tires of a size never available as original equipment. In that case the mechanic will often guess with a similar size that is listed.

There is another legal issue to be aware of besides a speeding ticket. If the outer circumference of the tire and / or the offset is different than what was designed in by the engineers, the braking, handling, ride comfort, and steering response will all be compromised, and lawyers and insurance investigators know that. Any feeling of improved braking or handling is an illusion. Any competent lawyer WILL convince a jury that your daughter was partly responsible for the crash when the other guy ran the red light. They'll argue she was less able to avoid it, and they will be right.

I can elaborate on that if you'd like me to. This also pertains to people who raise their trucks and lower their cars. No suspension and alignment specialist would do this to their own cars or to someone elses. It's perfectly okay to install different wheels as long as they don't move the tread of the tire further away from the car. It's also okay to install those ridiculous-looking low-profile tires with larger wheels, as long as the outer circumference doesn't change.
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Monday, September 1st, 2014 AT 6:08 PM

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