how does tire size affect pcm?
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TECH Fanatic
Joined: Mar 2003
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From: Jersey boy
how does tire size affect pcm? i know if you swap gears or change tire sizes it will mess up your speedometer but is there anything wrong with running taller tires on the street and putting smaller ones for the track? the reason would be for the (simulated) extra gearing. i seem to remember hearing something about the car not shifting right or something. so would there be anything wrong with this or should i give it a try?
Teching In
Joined: Jul 2003
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Re: how does tire size affect pcm? It would upset your shift points to some degree. If you're talking about a 1/4", I don't think it's a big deal.
I used to run 26" E/T's at the track and 25.75" Nittos on the street. I just set my PCM up for the track as that's where I wanted to be totally accurate.
Mark
I used to run 26" E/T's at the track and 25.75" Nittos on the street. I just set my PCM up for the track as that's where I wanted to be totally accurate.
Mark
