Car Tuning Chiptuning 3

Question 1

What is the function of an 'intercooler' in a turbocharged chiptuned engine?

Accepted Answer

Cool compressed charge air to increase its density before entering the engine

Answer

An intercooler reduces the temperature of compressed air from the turbo, increasing air density and allowing more fuel to be added safely for higher power output.

Question 2

In ECU terminology, what is a 'base map' or 'base tune'?

Accepted Answer

A starting-point calibration used before dyno refinement

Answer

A base map is a preliminary calibration — often derived from a similar car's tune — used as a safe starting point before live dyno or data-logging refinement.

Question 3

What does increasing the 'global fuel trim' (or 'global enrichment') do in a tune?

Accepted Answer

Adds or subtracts a percentage of fuel across the entire fuel map simultaneously

Answer

A global fuel trim applies a percentage correction to all fuel map cells at once, useful for quick rich/lean adjustments without editing individual cells.

Question 4

Which chiptuning method involves splicing a piggyback device into the injector signal wires?

Accepted Answer

Inline signal interceptor / piggyback tuning

Answer

Piggyback units intercept and modify sensor or injector signals between the factory ECU and engine components without reprogramming the OEM ECU.

Question 5

What is 'volumetric efficiency' (VE) and why does it matter in tuning?

Accepted Answer

How effectively an engine fills its cylinders with air relative to theoretical maximum

Answer

VE measures how well the engine breathes; tuners use VE tables to accurately calculate how much fuel to inject based on actual cylinder fill.

Car Tuning Practice Test

Car Tuning Practice Test

Car Tuning Chiptuning 3