RPM QUESTION.

[saeedakobiakov]

Hello,i figured with different size of tires (taller vs. sorter) i would notice rpm changes, but i didnt.

One thing for sure with 10mm shorter tires i run in the summer, the car is much more responsive due to the higher rpm of course, but again rpm stays the same.

i thought with resetting the computer i would see the difference in rpm, because it would adapt to the new tire size, but at 8o mph i am still at 3k rpm like with stock tires.

Any ideas?

Thanks,Caug.

[M4T5]

I would think you should be turning a bit higher in RPM's, but then again, it may not be enough to make a difference.

J

[ronez82]

Do a Google search for "tire size calculator" and the first one will be Miata.net. http://www.miata.net/garage/tirecalc.html Put in your tire sizes and it will tell you the differences. Hope that will shed some light on the subject.

[ken in az]

The gauge will stay the same but your actual speed is different. get a gps device and you'll see. only way you'll see it on the gauge is to have the ecu calibrated for the tire size on your car - the ecu cannot do this on it's own.

[saeedakobiakov]

i see, thats's what's up.car feels sooooo much better with shorter tire.cant wait take these winter stock height tires off. cool thanks,caug.