G-Chassis Tuning
The modern B-series — B48, B58, S58, S63TU. The platform we've spent the most R&D on. BM3-native calibration, in-house turbos for the cars that have outgrown their stock hardware, and full Stage 3 paths on the marquee chassis.
Chassis we support
The G-Chassis platform is the one we've spent the most R&D budget on. B58 and S58 both respond beautifully to calibration. The S58 in particular — the engine in the G80 M3, G82 M4, G87 M2 — is the cleanest sheet-of-paper BMW M engine in a decade, and its response to a proper Stage 1 / Stage 2 / Stage 3 path is repeatable, predictable, and dyno-honest.
On the volume side, B48 and B58 cars (G20 330i / M340i, G22 / G26 4-series, G29 Z4, G42 230i / M240i) carry a Stage 1 calibration that's been tested across hundreds of cars. Stage 2 and 3 paths exist for every G-platform that has the hardware to support them. The Phantom Series — our in-house turbos for the cars that have outgrown their stock units — is built around exactly these platforms.
Parts that fit the G-Chassis family
Not sure which chassis is yours? Set your car in the picker — we'll filter the store to parts that fit.
Set vehicleBefore you tune.
Will my dealer flag the tune at service?
The bootmod3 flash is non-destructive and reversible. Revert to stock before a dealer appointment and the ECU is back to factory in a few minutes; re-flash after service. We document the revert step in writing so the next person opening your file knows what's there.
Is it safe for the engine?
Every tune we ship has been datalogged on the car it was written for. We look at knock counts, fuel trims, boost behavior, and intake temps before we sign off. If the numbers don't sit right, we revise. That review and the revision policy are built into what the tune costs.
How long until I have a working tune?
Most calibrations turn around in a few days. We log, review, and revise before anything ships — we would rather get it right than get it out fast.
Can I go back to stock?
Yes. bootmod3 supports a stock revert that returns the ECU to factory calibration in under five minutes. The flash is non-destructive — nothing in the BMW DME is permanently modified. Most owners revert before trade-in.