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New BMW M3 M4 Custom ECU Remap

Tried and tested M3 and M4 remaps, delivering up to 550bhp, available at MoreBHP.

BMW M3 Competition being remapped on the rolling road at MoreBHP

The New F80 M3 and F82/F83 M4 powered by BMW's S55 3.0 straight six twin turbo engine are true works of BMW art. We have been perfecting the tuning of the S55 engine, in our development M3, for the last three years. Going deeper and deeper into the calibration to extract power and torque where ever possible, ever improving it's driveability. It has been an obsession of our best engineer to provide the very best M3 M4 (including the Competition and GTS)  S55 remap available anywhere. 

M3 M4 S55 engine bay picture taken during a MoreBHP Stage 1 Custom Rolling Road Remap

With a slight increase in turbo boost along with carefully optimised timing, fuelling rework and various limiter massages between 500-550 bhp is available, dependent on fuel quality used. The latest rolling road test of our development car showed 549bhp and 809Nm of torque delivered brilliantly.

We have also managed to extract this torque much earlier in the rev range where all others have failed to do. This of course can bring another set of problems, the traction department. So we developed our own version of "Torque by Gear" which when carefully calibrated allows for maximum grip of the tyres and un-paralleled levels of acceleration.

Rolling road dyno printout for the MoreBHP development F80 M3 with a Stage 1 Remap with octane booster

So how does this power and torque translate into forward motion? Well the bench mark across much of the world is an acceleration test of 100-200Km/h (62mph-124mph). Our development M3 running Pipercross panel filters, Akropovic exhaust and octane booster managed this time in 6.79 seconds. That is fast!

More-BHP Stage 1 F80 M3 100-200kmh acceleration test This is a genuine custom remap applied to the engine ECU NOT a tuning box fitted to the wiring harness. Fitting a tuning box to such a car is crazy, we have tested these so called solutions and found the ECU having to close the throttle to prevent engine damage due to excessive knocking (the result of way too much boost without correct fuelling/timing calibration).

We have also incorporated some other good features such as sports display recalibration to reflect the new power and torque available in the remap. We command the exhaust flaps to stay open all the time in "sport mode'. For those M3 and M4 owners that like their neighbours we can also switch off the noisy cold start if needed. For the non Competition M3 and M4 owners we can add and enhance the exhaust overrun pops and burbles found in the GTS. The speed limiter is removed for those trips to Germany.

 

Our S55 tuning and all it's features can also be applied to the new BMW M2 Competition.

If you have fitted an aftermarket exhaust with cat-less downpipes then we can also cater for that with a custom stage 2 Saturday tuning session, they are too loud to be tuned on a weekday when the neighbouring  companies are in.

To recap: In addition to the obvious benefits of 500+bhp/700+Nm the following is also included-

  • Cold start off (especially handy if you have a noisy decat at cold)
  • Decat MIL off 
  • Exhaust flaps permanently open in Sport Mode
  • GTS style enhanced exhaust pops and bangs.
  • Enhanced Sports Displays to reflect the increase in power and torque
  • Optional selectable power modes for ECO, Comfort, Sport and Sport Plus
  • Speed limit removal
  • Higher rev limit for manual cars
  • Torque by Gear activated
  • Octane booster map available

Some of our M4 remapping videos below: