One of the most common questions we get asked is: how much power can a Stage 1 remap add? The honest answer is that it depends on the engine — but there are some clear patterns.

Typical Stage 1 power gains

For modern turbocharged petrol engines, Stage 1 gains are typically in the 15-30% range. For modern turbocharged diesel engines, gains are often in the 20-40% range, particularly in torque. That’s because diesels respond especially well to optimised fuel and boost maps, and the existing engine hardware is usually well over-engineered for the stock map.

Factors that affect gains

Engine type — turbo diesels often see the largest absolute gains.
Engine size and cylinder count — bigger engines usually see more bhp added.
Turbocharger capacity — a bigger turbo can accept more boost.
Fuel quality — premium fuel is recommended after a performance remap.
Vehicle condition — worn sensors, clogged intake or weak ignition reduce the safe ceiling.
Software availability — not every model has a high-quality map from day one.

Real examples from Boostcore

Ford Transit Custom 2.0 TDCi EcoBlue: 105 → 190 bhp (+85 bhp, +100 Nm)
VW Golf GTI Mk7 2.0 TSI: 220 → 300 bhp (+80 bhp, +100 Nm)
Audi A5 3.0 TDI: 286 → 350 bhp (+64 bhp, +130 Nm)
BMW 335d xDrive: 313 → 365 bhp (+52 bhp, +80 Nm)

How to check your vehicle’s gains

Use our free vehicle lookup to see estimated Stage 1 gains for your car or van. Boostcore covers Southampton, Hampshire and the surrounding area.