speedometer calibration for 3rd gen
#6
OK....well, I have 18" rims with 35's in the rear & 40's in the front. Is it based on the front or rears?
Also, the printed formula on the speedo says: 60 MPH= 1024 RPM. The question I have is at what gear? And how do I adjust for my rim & tire sizes?
Thanks,
Ian
Also, the printed formula on the speedo says: 60 MPH= 1024 RPM. The question I have is at what gear? And how do I adjust for my rim & tire sizes?
Thanks,
Ian
#7
Keep to the right.
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From: Mascoutah, IL
You also need to give the section width. The 35 and 40 numbers have to be used as a percentage and multiplied by the section width to determine sidewall height.... In other words, if you are running 265mm section width tires in the rear, then the sidewall height is 0.35 x 265mm = 92.75mm = 3.65in
So....(18in wheels + (3.65in x 2)) x pi = 79.48in rolling circumference.
Which I know isn't your question exactly, but I'm trying to show how the numbers on the sides of your tire actually work.
-James
So....(18in wheels + (3.65in x 2)) x pi = 79.48in rolling circumference.
Which I know isn't your question exactly, but I'm trying to show how the numbers on the sides of your tire actually work.
-James
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#8
You can use this calculator to compare tire sizes and how they affect the speedo
http://www.miata.net/garage/tirecalc.html
http://www.miata.net/garage/tirecalc.html
#9
Originally Posted by rx7pimp
Can anyone tell me the best way to calibrate speedometer in my 94 3rd gen. Or let me know how fast you speedometer says when you are at 1000 RPM