whats real speed
04-11-05, 05:52 PM
#3
Mechanical Engineering
ive got a calculator that does those measurements, is that what you wanna find the speed of?
:edit:
the theoretical speed of that is @ 164 mph give or take for different factors 4.1 gear ratio and .762 5th gear
:edit:
the theoretical speed of that is @ 164 mph give or take for different factors 4.1 gear ratio and .762 5th gear
Last edited by capn; 04-11-05 at 05:56 PM.
04-12-05, 03:45 AM
#7
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Originally Posted by hIGGI
anyone got calculator for actual speed in TII based on gearing and tire size?
For example, whats real speed at 7000 rpm in 5th gear on 245/40/17 tire with stock TII (4.1) gearing?
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04-12-05, 06:28 AM
#8
Mechanical Engineering
Originally Posted by NZConvertible
I have. It's called MS Excel with added FSM.
S4 and S5 have different 5th gear ratios. For S4 (0.762:1) it would be 157mph, for S5 it would be (0.719:1) it would be 167mph.
S4 and S5 have different 5th gear ratios. For S4 (0.762:1) it would be 157mph, for S5 it would be (0.719:1) it would be 167mph.
04-12-05, 07:11 AM
#9
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A 205/60x15 tire has a calculated radius of 313.5mm, but the measured rolling radius (i.e from the ground up to hub centerline, with deflection due to weight into account) is 300mm. A 245/40x17 has a calculated radius of 313.9mm (+0.4mm), so I just used the same 300mm rolling radius for my calcs.
The only variable not known for certain is tire size. Unless you have the actual measured rolling radius for a specific tire, you can't expect to get an accurate figure.
The only variable not known for certain is tire size. Unless you have the actual measured rolling radius for a specific tire, you can't expect to get an accurate figure.
04-12-05, 11:19 AM
#11
dAracIngPhaRmaCist
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Yea, I think I understand what they are doing... *scratches head*... this seems just like one of those problems I had to do in geometry where they give you the radius of a bicycle tire and ask you if a person rides for a certain amount of time at a certain amount of rpm, how much distance will he cover... anyway, how do you get one of those calculators...
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