Please check my math
#1
More Mazdas than Sense
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Please check my math
O.k., just got my car on the road, and it seems, well, FAST!!!
I got the following numbers while driving:
3500 rpm = 120 kph
3800 rpm = 130 kph
4000 rpm = 140 kph
I have a GSL-SE trans hooked to a GSL rear end:
5th gear = 0.758
Final Drive = 3.909
So, doing the math:
3500 RPM / 0.758 / 3.909 = 1181.23 RPM at the wheel
I ride on 185/60/13's, and I measured the rears to be 263.5mm from the ground to the centre of the wheel, so effective radius = 263.5 (theoretical = 276.1). Circumference = 1654.78 mm
So, 1181.23 r/min * 1654.78 mm/r = 1.954676 * 10^6 mm/min = 1.955 km/min = 117.3 km/h
Similarily, 3800 rpm = 127.3 km/h, and 4000 rpm = 134 km/h.
Is my math right? 'Cause if so, I was hella speeding tonight!
I got the following numbers while driving:
3500 rpm = 120 kph
3800 rpm = 130 kph
4000 rpm = 140 kph
I have a GSL-SE trans hooked to a GSL rear end:
5th gear = 0.758
Final Drive = 3.909
So, doing the math:
3500 RPM / 0.758 / 3.909 = 1181.23 RPM at the wheel
I ride on 185/60/13's, and I measured the rears to be 263.5mm from the ground to the centre of the wheel, so effective radius = 263.5 (theoretical = 276.1). Circumference = 1654.78 mm
So, 1181.23 r/min * 1654.78 mm/r = 1.954676 * 10^6 mm/min = 1.955 km/min = 117.3 km/h
Similarily, 3800 rpm = 127.3 km/h, and 4000 rpm = 134 km/h.
Is my math right? 'Cause if so, I was hella speeding tonight!
#4
Originally Posted by kettlman
now you need to translate them to mph. ha ha ha
(I know you was making a joke, but i just had to before someone else did it)
#5
More Mazdas than Sense
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Touched 5k in 5th gear this morning on the way into work. That's 167.5 kph, or slightly more than 100 mile'n'hour.
Theoretical top speed (7000 rpm): 234.5 kph, or 146.6 mph.
Theoretical top speed (7000 rpm): 234.5 kph, or 146.6 mph.
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