TUNING G15 CUSTOM TUNE
G15 ·N63TU3 ENGINE ·BM3 CUSTOM CALIBRATION

BMW G15 M850i (N63TU3)

Logged, verified, revised. Documented in writing. Yours to keep.

A custom bootmod3 calibration for the G15 M850i (N63TU3) — built from datalogs on your car, not a map off a shelf. The G15 is the two-door 8-Series — coupe and convertible — and its N63TU3 is a torque-rich twin-turbo V8 that responds to a calibration aimed at effortless mid-range, the kind of pull that suits a grand tourer. We start from what your engine is actually doing in fuel trims, timing, knock, and load, and revise against the next log until the math and the data agree.

This is a GT, not a track tool, so we tune for a clean, linear delivery you can lean on every day.

How we approach it

Math first, datalogs second, marketing claims a distant last. We don't publish dyno numbers we can't reproduce; we tune to what your specific car does on the fuel you actually buy.

Configure your tune →

BM3 NATIVE · 4-5 DAYS TO FIRST CALIBRATION
CALIBRATION DATA PENDING
Stock HP
Stock TQ
Our Peak
Our TQ
DYNO CHART COMING SOON
REPRESENTATIVE CURVE · STAGE 2 · E30 FLEX
AVAILABLE STAGES

Pick your stage.

STAGE 1
$495.00
REQUIRES

Stock supporting hardware OK.

CONFIGURE →
STAGE 2
$595.00
REQUIRES

Stock supporting hardware OK.

CONFIGURE →
STAGE 3
$895.00
REQUIRES

Stock supporting hardware OK.

CONFIGURE →
DIRECT PURCHASE

Returning customer? Skip the configurator and order by VIN. Your tune will be calibrated and emailed once we receive your datalog.

17 characters, alphanumeric. Excludes I, O, Q. Used to license the tune to your specific car.

METHODOLOGY

How we calibrate this platform.

Methodology notes for this chassis publish with its first documented build. The process is the same on every car we touch: datalogs in, ignition and fuel changes out, a revision log in writing.
ANSWERED

Before you tune.

How long until I have a working tune?

4-5 business days from datalog receipt for Stage 1; 7-10 days for Stage 2.

Do I need supporting hardware for Stage 2?

Chargepipe and a fuel system check are recommended. E30 flex requires a flex-fuel kit on chassis that don't ship one factory.

Can I revert to stock for warranty service?

Yes. BM3 supports non-destructive stock revert. Most customers revert before dealer appointments and re-flash after.

What VIN do I enter at checkout?

The 17-character VIN of the car you're tuning. It appears on the driver-side dash, door jamb sticker, and registration.

CUSTOMER REVIEWS

What customers say.