Tuning Guru

86 guides · no sign-up · no sponsored picks

Work out what a modification actually changes.

Tuning Guru explains the systems under a car in plain English — what each part does, what happens when you change it, and how to tell a real gain from a marketing claim. Written for people who do the work themselves.

Browse by system Browse by marque
A dyno plot comparing a stock engine with a tuned one Power and torque are both higher across the whole rev range after tuning, with the largest gain in the middle of the range. The plot is an illustration, not a measurement. 1 2 3 4 5 6 7 RPM × 1000 redline
  • Power, tuned
  • Torque, tuned
  • Stock
Illustrative — the shape of a typical gain, not a run from any particular car. What a real map is worth on your engine is what a dyno test is for.

Start with the system you are working on

  • Tuning & Power

    Remapping, forced induction, intake and the measurements that tell you whether any of it worked.

    22 guides

  • Engine

    What turns inside the block, what feeds it, and what holds it in place.

    7 guides

  • Exhaust & Emissions

    Getting gas out of the engine, and getting the car through its emissions test.

    8 guides

  • Drivetrain

    Clutches, gearboxes and differentials — everything between the crank and the road.

    7 guides

  • Suspension & Brakes

    Damping, steering and stopping: the parts that decide how a car actually feels.

    9 guides

  • Electrical & Sensors

    Charging, signalling and the sensors a modern engine will not run without.

    9 guides

  • Maintenance & Care

    The jobs on a service schedule, and the ones that keep a car looking like it is cared for.

    10 guides

  • Buying Parts

    OEM against aftermarket, what is street legal, and how to read a parts listing.

    5 guides

Or start with the car

  • Audi

    Quattro, the RS and S cars, and what the tuning market offers each platform.

    14 guides

  • Volkswagen

    Golf, GTI, Beetle and the 1.8T — the platforms with the deepest parts bin.

    7 guides

  • Porsche

    The 911 through the 997 and 991, and the modifications worth making to one.

    2 guides