Tuning Guides
The maths behind the mods, in plain English. Each guide explains one topic properly — then hands you the free calculator to run your own numbers. No fluff, no sign-up.
How to read a tire size
What every number on your tire sidewall means — width, aspect ratio, construction, wheel diameter, load index and speed rating — with worked examples.
6 minWheel offset explained
What ET / offset and backspacing mean, how positive vs negative offset changes where a wheel sits, and how to work out whether a wheel will clear or poke.
6 minCompression ratio explained
What static compression ratio means, how it is calculated from bore, stroke, chamber, gasket and deck, and what ratio suits naturally aspirated versus boosted engines.
6 minAFR and lambda explained
What air-fuel ratio and lambda mean, why stoichiometric differs by fuel, and the AFR targets tuners use for idle, cruise, and wide-open throttle on petrol and E85.
5 minPower-to-weight ratio explained
Why power-to-weight predicts performance better than horsepower alone, how to calculate it in hp/ton and kg/hp, and how to compare cars fairly.
7 minHow to size a turbo
How to pick a turbocharger from a power target: required airflow in lb/min, pressure ratio, and how to read a compressor map without getting lost.
6 minBrake bias explained
What front-to-rear brake bias is, how weight transfer under braking sets the ideal split, and what happens when the balance is wrong.
6 minCorner balancing explained
What corner weights and cross-weight (wedge) mean, why 50% cross makes a car handle the same both ways, and how corner balancing actually works.
6 minTrap speed vs ET explained
What quarter-mile ET and trap speed each measure, why trap speed is the honest power number, and how to read a drag strip time slip like a racer.