Gear / speed / RPM

[terrybullwon]

Did i see a thread some where that you could work the gear speeds out?

I am trying to set up my dash and need to put in a few numbers in.

I know rolling circumference of the wheel will make a difference i dont need it to be pin pot. If some one has already done this please could you share?

Even the standard gear ratio's would be good starting point

Thanks Chef

[Error404]

http://www.apexgarage.com/tech/gear_ratios.shtml

CGR / CRB ratios:
1st 3.50
2nd 1.89
3rd 1.32
4th 1.03
5th 0.86
6th 0.71

[Rusty]

Download racechrono or any GPS speedo for your phone?

[UrS4boy]

Did i see a thread some where that you could work the gear speeds out?
I am trying to set up my dash and need to put in a few numbers in.
I know rolling circumference of the wheel will make a difference i dont need it to be pin pot. If some one has already done this please could you share?
Even the standard gear ratio's would be good starting point
Thanks Chef

Here is some UrS4 info ("speedcalc3.xls" hopefully attached)


1993 Audi S4 - Speed in Gears

Final Drive: 4.11
Tire Size 16 225 50
Tire Dia. 24.86 inches
Tire Circumference 6.51 feet
Tire Circumference 1.98 m

Gear in CBD Transmission Ratio Speed at
7200 RPM
1 3.50 59.6 kmph 37.0 mph
2 1.89 110.3 kmph 68.5 mph (0-60 with one shift)
3 1.23 169.5 kmph 105.3 mph
4 0.93 224.2 kmph 139.2 mph
5 0.73 285.6 kmph 177.4 mph
5 0.73 234.0 kmph 145.3 mph (at 5900 RPM - peak hp)
5 0.73 242.0 kmph 150.3 mph (at 6100 RPM - falling off the curve)

Gear in CRB Transmission Ratio Speed at
7200 RPM
1 3.50 59.6 kmph 37.0 mph
2 1.89 110.3 kmph 68.5 mph (0-60 with one shift)
3 1.32 158.0 kmph 98.1 mph
4 1.03 202.4 kmph 125.7 mph
5 0.86 242.4 kmph 150.6 mph
6 0.71 293.7 kmph 182.4 mph (not likely)
6 0.71 240.6 kmph 149.4 mph (at 5900 RPM - peak hp)

Gear in EDU/DSY Transmission Ratio Speed at
7200 RPM
1 3.50 59.6 kmph 37.0 mph
2 1.89 110.3 kmph 68.5 mph (0-60 with one shift)
3 1.32 158.0 kmph 98.1 mph
4 1.03 202.4 kmph 125.7 mph
5 0.81 257.4 kmph 159.8 mph
6 0.68 306.6 kmph 190.4 mph (not likely)
6 0.68 251.3 kmph 156.0 mph (at 5900 RPM - peak hp)

[A1QSHIP]

Try this site.

http://www.catherineandken.co.uk/sti/tyres.html

HTH, Chris