MPH at a given RPM for auto and 2.20
07-14-2005, 01:47 PM
#16
Mark:
The 245/45/16s are .2" shorter in overall diameter than the 225/50/16 oem tire
24.7" vs 24.9".
According to the miata tire converter http://www.miata.net/garage/tirecalcold.html that results in a reading 0.7% fast vs the stock tire size.
When my speedo indicates 60mph i am actually travelling at 59.6
The readings i gave were cruise rpms in 4th(top) gear.
You seem pretty familiar with this formula mark, feel like running my numbers for me so i can finally know what my final drive ratio is?
The 245/45/16s are .2" shorter in overall diameter than the 225/50/16 oem tire
24.7" vs 24.9".
According to the miata tire converter http://www.miata.net/garage/tirecalcold.html that results in a reading 0.7% fast vs the stock tire size.
When my speedo indicates 60mph i am actually travelling at 59.6
The readings i gave were cruise rpms in 4th(top) gear.
You seem pretty familiar with this formula mark, feel like running my numbers for me so i can finally know what my final drive ratio is?
07-14-2005, 01:52 PM
#17
"What year is yours? You should be able to determine final drive based on that, unless somebody did something wacky with your car:"
83 US, but i know the trans has been modified. It always starts in 1st regardless of gear selector position and throttle position.
As i understand, that is not normal behaviour for the MB unit, which should start in 1st from a standing start only when the GO pedal is depressed close to all the way.
I can put away from a light at 5% throttle, and it will start in first regardless.
83 US, but i know the trans has been modified. It always starts in 1st regardless of gear selector position and throttle position.
As i understand, that is not normal behaviour for the MB unit, which should start in 1st from a standing start only when the GO pedal is depressed close to all the way.
I can put away from a light at 5% throttle, and it will start in first regardless.
