C4 auto overdrive gear ratio
02-03-2002, 04:50 PM
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Just an Ole Surfer Boy
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St. Jude Donor '04-'05-'08-'09-'10-'13-'14
C4 auto overdrive gear ratio///rear gear/rpm formula
What is the gear ratio for a 1993 A4 overdrive gear. I think it is .67 but am not sure.
[Modified by Crusher137, 6:04 PM 2/3/2002]
[Modified by Crusher137, 6:04 PM 2/3/2002]
02-03-2002, 05:20 PM
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St. Jude Donor '04-'05-'08-'09-'10-'13-'14
Re: C4 auto overdrive gear ratio (93Zeus)
Thanks, I have the formula from DTS to figure out your RPM's with certain rear gears and needed the trans overdrive ratio to do it. Want to move up from the 3:07 but don't want to tach crazy numbers in overdrive at cruising speeds.
Crusher
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02-03-2002, 05:27 PM
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St. Jude Donor '04-'05-'08-'09-'10-'13-'14
Re: C4 auto overdrive gear ratio (Crusher137)
In case anyone wanted the formula...
Q. How can I determine what ratio to use for my application?
A. mph x gear ratio x trans ratio x 336 ÷ Tire Diameter = RPM
Tire Diameter
Example:
70 mph x 3.73 (gear ratio) x .70 (trans ratio) x 336 ÷ 27(tire diameter) = 2274RPM
70 mph with a 3.73 ring and pinion over drive transmission in 4th gear with a 27" tire will perform at 2274 RPM...
[Modified by Crusher137, 4:29 PM 2/3/2002]
[Modified by Crusher137, 6:07 PM 2/3/2002]
Q. How can I determine what ratio to use for my application?
A. mph x gear ratio x trans ratio x 336 ÷ Tire Diameter = RPM
Tire Diameter
Example:
70 mph x 3.73 (gear ratio) x .70 (trans ratio) x 336 ÷ 27(tire diameter) = 2274RPM
70 mph with a 3.73 ring and pinion over drive transmission in 4th gear with a 27" tire will perform at 2274 RPM...
[Modified by Crusher137, 4:29 PM 2/3/2002]
[Modified by Crusher137, 6:07 PM 2/3/2002]
02-03-2002, 08:15 PM
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St. Jude Donor '04-'05-'08-'09-'10-'13-'14
Re: C4 auto overdrive gear ratio (Crusher137)
TTT
