Car Tuning Chiptuning 4

Question 1

What is 'flex fuel tuning' in chiptuning?

Accepted Answer

Calibrating the ECU to automatically adjust fueling and timing based on ethanol content in the fuel

Answer

Flex fuel tuning uses an ethanol content sensor to let the ECU blend between gasoline and E85 maps in real time, optimizing power and safety for any ethanol mixture.

Question 2

Which of the following is a common symptom of over-advanced ignition timing?

Accepted Answer

Engine knock or ping, especially under load

Answer

Over-advanced timing causes the air-fuel mixture to ignite too early, leading to detonation (knock/ping) that can rapidly damage pistons and bearings.

Question 3

What does 'closed-loop fueling' mean in ECU operation?

Accepted Answer

The ECU uses O2 sensor feedback to continuously correct the fuel mixture toward a target AFR

Answer

Closed-loop operation means the ECU reads oxygen sensor feedback and trims fueling in real time to maintain the target air-fuel ratio.

Question 4

In chiptuning, what is a 'dyno pull' used for?

Accepted Answer

Measuring engine output on a dynamometer to verify and refine tune results

Answer

A dyno pull loads the engine to wide-open throttle across the RPM range so the tuner can read power, torque, and AFR to refine fuel and timing maps.

Question 5

What is 'blow-off valve' (BOV) function in a turbocharged chiptuned car?

Accepted Answer

Vent compressed charge air when the throttle closes to prevent turbo compressor surge

Answer

When the throttle snaps shut, a BOV vents pressurized intake air to atmosphere (or recirculates it), preventing the pressure wave from stalling the turbo compressor.

Car Tuning Practice Test

Car Tuning Practice Test

Car Tuning Chiptuning 4