BMW M140i / M240i (F20,F21,F22)

Tuning guide

The *40i BMW engine range are equipped with the B58 engine, a 3.0 single twin scroll turbocharged straight six, equipped with dual Vanos, Valvetronic (Variable cam lift) with direct injection

The engine is quite frankly is a little gem, producing maximum torque under 2000rpm yet still able to keep peak power at the top end of the rev range. Usually paired with the equally impressive ZF8 automatic gearbox which makes gearchanges effortless, removing all negativity we would usually associate with automatic gearboxes. Released with official figures of 340hp by the manufacture, this is rarely the case on the dyno - with most companies including ourselves regularly seeing 360-370hp prior to tuning.

The straight 6 engine is part of BMW's modular engine family (B38/B48). The B58 is the one which you will find installed in most of the current models (3 Series, X3, X5 etc) this post is also relevant to almost all models equipped with this engine.
With no real common weak links yet apparent, the main limitation will come from inlet temperatures as the charge cooler is built into the inlet manifold as a one piece unit. Currently there are only upgrades for the charge cooler radiator available to improve cooling.

B58 Engine ECU tuning can be offered across two options, our standard CustomPro tune with its proven calibrations - which have been Dyno, Track and also importantly Road tested. Alternatively, we can offer BM3 (Bootmod3) software for the end user who  wants the ability to fine tune some settings themselves, custom BM3 tunes can also be offered. TCU (Transmission) tuning can also be offered on the ZF8 Automatic gearboxes by XHP, for the perfect combination.

For the power hungry folk, or those who simply want to improve their soundtrack - plenty of upgrades can be offered from MOT legal exhaust systems and full track system (not road legal), along with Hybrid turbo chargers and engine cooling upgrades. Click here for Performance Upgrades

For those Track Addicts, Nurburgring goers or simply for those who have increased their power and want a chassis to match, we can offer simple upgrades from high performance pads / brake lines to full  suspension coilover systems, with various Roll bar and bush upgrades. Click here for Chassis Upgrades

Stage 1

The first step with extracting power from the B58 engine requires no hardware changes, this is software only upgrade. The ECU software follows the linear torque delivery of the stock ECU tune through the low to mid range while adding a flat 50lbf, while at higher rpm range, where the standard power curve starts to flatten off, we keep the power climbing, holding the peak power right up to the limiter where as much as 430HP can be seen.

We retain this flat torque delivery for driveability reasons, most of the 40i models do not come equipped with an LSD, with this in mind additional torque moments or spikey delivery can provoke unwanted wheel spin, and show up chassis limitations. On request additional torque can be offered (Limited slip differential advised) with a TCU tune.
With our 'Stage' software upgrades the following features are included:

  • Vmax Removal (Speed limiter removed)
  • Sports Displays recalibrated to suit new outputs
  • Enhanced over run (Optional)
  • Switchable map modes (Certain Software versions only)

Expected Results, based on our Dyno Dynamics rolling Road:

+80-100HP (420-440HP)
+50-60LBFT (450-460LBFT)

WGM Stage 1 Tuning Package

Stage 2

An additional step towards improving exhaust flow of the stock turbocharger is the removal of the catalyst in the downpipe, upon removal of the standard catalyst it is recommended to install a sports cat to retain MOT legality, or a full de cat pipe can be utilised for optimal gains if the vehicle is to be for track use only. With the free flowing downpipe installed fueling can be optimized and new lambda targets set, and boost levels and ignition timing can be optimised, taking into account the less restrictive exhaust system.

Standard cat back with or without GPF filters can be still retained, however optimal results are based on a free flowing turbo back system being fitted. Low end response is improved and turbo lag is reduced, torque curve will be held similar to stage 1, with an extra 10-15LBFT  however power at higher RPM will increase by 10-15hp.

With our 'Stage 2' software upgrades the following are included:

  • Vmax Removal (Speed limiter removed)
  • Sports Displays recalibrated to suit new outputs
  • Catalyst code removal to avoid EML lights
  • Cold start delete (removal of high / loud idle) (optional)
  • GPF delete software (If applicable)
  • Enhanced over run (Optional)
  • Switchable map modes (Certain Software versions only)

Expected Results, based on our Dyno Dynamics rolling Road:

+90-115HP (430-455HP)
+ 60-70LBFT (460-470LBFT)

WGM Stage 2 Tuning Package

Stage 3

The stock turbochargers are the limiting factor when it comes to the next stage of performance, with compressors / turbines limiting any more flow. With larger compressors and turbines installed into the stock turbo housings, these 'Hybrids' allow much great flow of air flow, and exhaust gas flow. High flow downpipes are must at this state of tune, and with a cat back system advised for optimal gains.
Charge temperatures start to creep up, when increasing the boost pressures - so depending on target HP and usage we would advise a charge cooler radiator upgrade as well. Water Methanol would also be a recommended upgrade when looking for maximum output.

TCU Flash is highly recommended at this level of tune.

With our 'Stage 3' software upgrades the following are included:

  • Vmax Removal (Speed limiter removed)
  • Sports Displays recalibrated to suit new outputs
  • Catalyst code removal to avoid EML lights
  • Cold start delete (removal of high / loud idle) (optional)
  • GPF delete software (If applicable)
  • Enhanced over run (Optional)
  • Switchable map modes (Certain Software versions only)

Expected Results, based on our Dyno Dynamics rolling Road:

+160-260HP (500-600HP)
+ 60-100LBFT (460-500LBFT)

WGM Stage 3 Tuning Package

OUR SERVICES INCLUDE

Dyno Testing

All ECU remaps are carried out on our State of the Art Dyno Dynamics Dynotech rolling road, which can accurately read upto 1200HP

Data Logging

Each car is hooked up to a Wide band lambda sensor to ensure correct air to fuel ratio, along with data logging tools to ensure Boost, Ignition timing parameters are all incheck

Diagnostic Check

We carry out a pre and post tuning ECU diagnostic trouble code check (DTC) to ensure no faults are present before or after tuning