G14 Tuning
BMW's 840i Convertible, M850i Convertible, 2019–2026. Powered by the B58/N63TU engine family.
Stage pricing for the G14
Cooling, downpipe, fueling — the ceiling worth chasing on factory turbos.
Build this stage Stage 2 methodologyBigger fueling, often a hybrid or Phantom turbo. Per-car.
Build this stage Stage 3 methodologyThe G14 is the 8 Series Convertible — the G15 coupe with the roof down, BMW's luxury grand tourer in soft-top form. Same engines: the 840i B58 (333 hp), the M850i N63 V8 (523 hp), tuning as they do across the range (B58 on the G20 page, N63 on the G11; full 8-series context on the G15).
The soft-top adds weight and trades a little rigidity — the open-top GT compromise — making it the most relaxed 8 to own. Honest notes are the engine-family items and a used drop-top's careful inspection.
So the G14 is the open-top grand tourer: G15 character, sky overhead.
Parts that fit the G14
DR Forged wheels for the G14
Custom, made-to-order forged wheels — built to your car's spec, so any of them fits the G14. Pick the look; we build the fitment.
Tech essays for the G14
Tuning and Your Warranty: What's Reversible, and What's Actually Detectable
The honest version of the warranty question — what Magnuson-Moss actually says, what we flash back before a dealer visit, and what...
ReadFEMTO & the Bosch DME Lock Guide for BMW & MINI
When it comes to tuning modern BMW and MINI vehicles, enthusiasts have encountered significant challenges starting with the 2020+ models. Bosch's updated…
ReadUpcoming events
Cars & Coffee Delray Beach
Cars & Coffee Miami — Jungle Island Father's Day
Supercar Sundays Florida — Father's Day Car Show
Set the G14 as your garage vehicle and the rest of the store filters to what fits it.
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.