F23 Tuning
BMW's 228i Convertible, 230i Convertible, M240i Convertible, 2015–2021. Powered by the N20/B48/B58 engine family.
Stage pricing for the F23
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 F23 is the open-top version of the F22 2 Series — and it keeps what made the coupe special: a small, rear-drive, straight-six car at a price that doesn't require an M badge. The M235i runs the N55 (around 320 hp), the M240i the B58 (335 hp), both tuning the way they do in the coupe (full story on the F22 and F30/G20 pages).
The soft-top trades a little structure and adds some weight — the usual open-top compromise — but it's still one of the few genuinely affordable rear-drive drop-tops with real straight-six tuning potential. The honest notes carry over from the engines (the N55's water pump, the housing gaskets; F22 page).
So the F23 is the cheap, rear-drive, six-cylinder convertible — the F22's fun with the roof stowed.
Parts that fit the F23
DR Forged wheels for the F23
Custom, made-to-order forged wheels — built to your car's spec, so any of them fits the F23. Pick the look; we build the fitment.
Tech essays for the F23
Upgraded Stock-Frame Turbos: Response vs. Max Power — Why We Build Two
Why we build two upgraded stock-frame turbos: Stage 1 for response and driveability, Stage 2 for maximum power from the stock frame...
ReadB48 Tuning Guide: Stages, Supporting Mods, and What Actually Holds Up
The definitive B48 platform reference for BMW and MINI owners: what each stage changes, which supporting mods Stage 2 needs, when the...
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
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Set the F23 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.