The Librarian

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

CBD Transmission (NAmerican 5 speed)
Speed at 3040 RPM

Gear Ratio Speed
1 3.50 25.2 kmph 15.6 mph
2 1.89 46.6 kmph 28.9 mph
3 1.23 71.6 kmph 44.4 mph
4 0.93 94.7 kmph 58.8 mph
5 0.73 120.6 kmph 74.9 mph

CBM Transmission (Euro UrS4/S6 6 speed)
Speed at 3040 RPM

Gear Ratio Speed
1 3.50 25.2 kmph 15.6 mph
2 1.89 46.6 kmph 28.9 mph
3 1.32 66.7 kmph 41.4 mph
4 1.03 85.5 kmph 53.1 mph
5 0.86 102.4 kmph 63.6 mph
6 0.73 120.6 kmph 74.9 mph

CRB Transmission (RS2 6 speed)
Speed at 2950 RPM

Gear Ratio Speed
1 3.50 24.4 kmph 15.2 mph
2 1.89 45.2 kmph 28.1 mph
3 1.32 64.7 kmph 40.2 mph
4 1.03 82.9 kmph 51.5 mph
5 0.86 99.3 kmph 61.7 mph
6 0.71 120.3 kmph 74.7 mph

I trust that will settle things.

TabulaRasa

Click on "Gearhead".<ul><li><a href="http://www.cvsr.net/php/links.php">http://www.cvsr.net/php/links.php</a</li></ul>

chaloux

where'd you get these? thumbs up

quattro20v

Why did you choose 3040 RPM as a reference point for the CBD and CBM and 2950 for the CRB?

Nevermind - I see you were working "backwards" to get the equivalent rpm based on the same speed in the top gear.

UrS4boy

"arguement". Basically at 75 mph with stock diameter tires, the engine should be turning about 3000 RPM plus or minus 50 RPM, depending on the "C" series transmission.

I can also easily change the wheel and tire size and see the effect on speed and RPM, if any.

UrS4boy

<ul><li><a href="https://forums.audiworld.com/s4s6/msgs/101051.phtml">https://forums.audiworld.com/s4s6/msgs/101051.phtml</a</li></ul>

chaloux

I'm not trying to argue, just curious. I was wrong when I first stated my revs were lower in 6th then 5th, it musta been a preconceived idea just from driving the two cars at different times.

By the way, this is the first time I noticed that you and the Librarian are the same person. Duuuuuh.