Audi TT 2007 - Overall Transmission Ratio I, Calculating

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♦ Picture of damage on the locking collar:
C - Worn longitudinal inner spline camber and the locking collar
♦ Comparison: locking collar not damaged:
D - Undamaged longitudinal inner spline camber and the locking
collar
Clutch Mechanism, Clutch
♦ If the clutch pedal does not return to the starting position (rest
position) after the recoupling procedure, bleed the clutch sys‐
tem (further measures. Refer to
⇒ “1.3 Information Regarding the Removal and Installation of
the Clutch Master or Slave Cylinder”, page 13 ).
♦ Do not tilt clutch pressure plate; loosen and tighten one after
another in 90° increments.
♦ To reduce odor caused by a burnt clutch, thoroughly clean the
transmission housing around the clutch as well as the engine
on the transmission side.
♦ Only use compressed air to blow out the dual-mass flywheel.
♦ The clutch pressure plates are corrosion-protected and
greased. With the exception of the friction surface on the clutch
plate, do not clean the pressure plate. This will shorten the
service life of the clutch considerably.
♦ The friction surfaces on the pressure plate and on the dual
mass flywheel must be cleaned thoroughly (degreased).
1.5 Overall Transmission Ratio i, Calculat‐
ing
Example:
6th Gear Final Drive
Driving gear ZG
1
= 34 ZA
1
= 22
Driven gear ZG
2
= 31 ZA
2
= 72
i = ZG
2
: ZG
1
1)
i
G
= gear ratio = ZG
2
: ZG
1
= 31 : 34 = 0.912
i
A
= axle ratio = ZA
2
: ZA
1
= 72 : 22 = 3.273
i
total
= total ratio = i
G
x i
A
= 0.912 x 3.273 = 2.985
1) Z
1
= No. of teeth drive gear, Z
2
= No. of teeth driven gear
Audi TT 2007 ➤
Manual Transmission - Edition 10.2009
6 Rep. Gr.00 - General, Technical Data