Car Tuning Drivetrain and Transmission 4

Question 1

What is the advantage of a carbon fiber driveshaft over a steel driveshaft in performance applications?

Accepted Answer

Lower rotational mass reduces parasitic drivetrain loss and raises the critical speed threshold

Answer

Carbon fiber's lower rotational inertia reduces power loss and allows higher rotational speeds before harmonic resonance (critical speed) occurs.

Question 2

In drag racing, what is the purpose of a 'trans-brake' in an automatic transmission?

Accepted Answer

It simultaneously engages forward and reverse to hold the car stationary while building torque converter stall

Answer

A trans-brake engages first and reverse simultaneously, holding the car against full engine power so the driver can stall the converter before release.

Question 3

When selecting CV axles for a high-power FWD build, what specification is most critical to prevent premature failure?

Accepted Answer

The axle's rated torque capacity (typically expressed in ft-lbs or Nm)

Answer

CV axles have a torque rating; using axles rated below the engine's output will result in CV joint failure under hard acceleration.

Question 4

What is 'final drive torque multiplication' and how does it differ from engine torque?

Accepted Answer

It is the engine torque multiplied by the total gear ratio (transmission × final drive), representing actual wheel torque

Answer

Final drive torque multiplication equals engine torque × transmission ratio × axle ratio; this is the total torque available at the wheels.

Question 5

In a sequential gearbox conversion, what component replaces the standard H-pattern shift gate?

Accepted Answer

A forward/back lever with a ratchet or paddle mechanism for one-gear-at-a-time shifts

Answer

Sequential boxes use a single forward/back motion (or paddle) that moves through gears in order, with a drum-type selector instead of a sliding fork H-gate.

Car Tuning Practice Test

Car Tuning Practice Test

Car Tuning Drivetrain and Transmission 4