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Pcm tire size change

3K views 3 replies 4 participants last post by  Dave1987 
#1 ·
I was wondering if you could have the tire size changed so that the speedo reads correctly after putting bigger Tires on a 97 sportage?
 
#2 ·
I used something similar to a Yellow Box Speedometer Calibrator http:/www.yellr.com and put it between the speed sensor and the ecu.
Haven'd had any issues with it and it was probably cheaper than changing the ecu.
UPYOURKIA
 
#3 ·
sure you could
what is the difference now?
is it % of current speed or the speed is off by 5 mph or so?

Changing tires will help to overcome % (ratio) error. It will not help if the speedo adds 5 mph.

On the other hand - if the error is marginal (up to 5 mph at say 60 mph) I would not really worry. Just keep it in mind.

but I confirm, I had Elantra in which bigger tires caused the speed to be spot on.
 
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