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Tire size tuning

buck531

buck531

New member
Does anyone know what the pulses per mile would be going from a tire size of 225/60/16 to a 205/55/16? The MPH reads 5 mph faster than the odometer/pcm reads. I know where to change it, just don't know what to change it to.

I'm using a DHP too.. in a fiero 3800 swap.
 


Because the stock tires/wheels were junk so I found a set of cavalier z24 wheels with 205 tires on them for super cheap. They work. They actually hook but the speedo if off due to the size change.

I JUST got a set of Beretta 16x7's and planning on 245/50/16 in the back and 225/50/16 in the front.... after I refinish them.
 
I'd have to have someone look up the bin file and I'm at work and don't have my tuning laptop with me. Maybe someone (Scotty) can post the stock number. I think it's 23XXX or something around there.
 
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