BMW B57 Tuning

"All you need to know about performance parts and tuning the BMW B57 engine!"

The BMW B57 make a good tuning project and with the ultimate motorsport inspired enhancements you will dramatically enhance your driving pleasure.

We review and look at B57 tuning and summarise the greatest upgrades. BMW B57 make a good tuning project engine and with the optimum upgrades like remaps, turbo kits and camshafts you will definitely maximise your driving enjoyment.

TorqueCars will review and look at B57 tuning and summarise the best upgrades.

History, Power & Specs of the Engine

This Turbo diesel straight 6 was released in 2015 and belongs with the modular engine range from BMW, namely the B37 B47 diesels.


Single turbo engine

  • 195 kW (261 hp) at 4,000 rpm  (457 lbft) at 2,000–2,500 rpm


Twin Turbo engine

  • 235 kW (315 hp) at 4,000 rpm (502 lbft) at 1,750–2,250 rpm


Quad Turbo engine

  • 294 kW (394 hp) at 4,400 rpm  (561 lbft) at 2,000–3,000 rpm

Tuning the BMW B57 and best B57 performance parts.

Best B57 upgrades

The greatest B57 parts on an engine are as we have found the ones that give the best value for money.

We won't be swayed by popular B57 parts, they need to be cost effective.

The cam profile plays a big part in the engines power output so cam upgrades make quite a large difference. The intake and exhaust durations will alter depending on the chosen cam profile, so large engines power gains are on offer for cam upgrades.

Fast road camshafts tend to increase the bhp throughout the rev band, you might lose a little low down torque but your higher rpm power will be lifted.

Motorsport and race camshafts, increase the higher rpm power band but as a result the car will not idle smoothly and low end power nearly always suffers.

For a daily driver you need to match your torque band to your usage of the car.

I'd be shocked if you'd have found a B57 Motorsport and race camshaft is a pleasure to live with when driving in heavy traffic. The low end idle will be very lumpy and irregular, so something you would notice on a track when you drive in the upper third of the rpm band, but on roads this is a serious issue and we've heard from lots of drivers lamenting their decision to add an extreme competition cam profile to their engine.

Each engine responds better to less aggressive camshaft durations than others.

The map and fuelling also have a large bearing on the power gains you'll make.

Altering valve durations can alter the power band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations.

Typical stage 1 mods often include:
Remaps/piggy back ECU, Sports exhaust manifold, Fast road camshaft, drilled & smoothed airbox, Intake headers, Panel air filters.

Typical stage 2 mods often include:
Sports catalyst & performance exhaust, Ported and polished head, Fast road cam, fuel pump upgrades, high flow fuel injectors, induction kit.

Typical stage 3 mods often include:
Competition cam, Adding or Upgrading forced induction (turbo/supercharger), Twin charging conversions, Engine balancing & blueprinting, Internal engine upgrades (head flowing porting/bigger valves), Crank and Piston upgrades to alter compression.


The B57 units are fantastic to work on and we're happy to report there is an increase of mods and performance parts around.


ECU flashing will help fully realize the full potential of all the modifications you've done to your B57.

(In some cases, as the factory ECU is locked flashing is not an option, so an aftermarket ECU is the route to take, and many of these will outperform factory ECU's but make sure it has knock protection and that you get it setup properly.)

It will usually give you around 30% more power on turbocharged vehicles and you can expect to see around 15% on NASP engines, but the outcome will differs on the modifications you've carried out and the condition of your engine.

It is vital to any engine performance tuning task to force air into your B57

Headers transmit the air from the air filter and allow it to be drawn into the engine cylinders.

Design and rate of flow of the Headers can make a substantial change to fuel atomisation on the B57.

Many mass produced engine plenum chambers are in dire need of a performance upgrade, although some manufacturers provide fairly well optimized plenum chambers.

Fitting big valve kits, carrying out port work and head flowing will also boost performance, and more importantly will give you an improved performance increase on other parts.

Turbo upgrades

NASP engines need quite a lot of work when you add a turbo, so we have a separate guide to help you take into account the pros and cons of going this route on your B57

The more air you can get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes excellent power gains.

If the engine has a turbocharger parts are more reliable and turbo engines will have better components.

However every engine has limitations on how much power it can handle.

We recommend you find these limits and install better quality crank and pistons to utilize the power.

We see many people spending a loads on turbo charger upgrades on the B57 only to see the engine catastrophically fail soon after it's been finished.

Large capacity turbo chargers commonly suffer no power at low rpm, and low capacity turbo chargers spool up much more quickly but do not have the high rpm torque gains.

In recent times the range of turbo chargers is always moving on and we are seeing variable vane turbo chargers, permitting the vane profile is altered according to speed to lower lag and increase top end performance.

Twin scroll turbo chargers divert the exhaust gases into two channels and flow these at differently angled vanes in the turbo. They also increase the scavenging effect of the engine.

You'll commonly see there is a limitation in the air flow sensor MAP/MAF/AFM on the B57 when considerably more air is being pulled into the engine.

We note 4 bar air sensors coping with quite large power gains, whereas the OEM air sensor was restricting power at a much lower level.

Adding a supercharger or additional turbo will make large bhp and torque gains, although more difficult to install. We have this article covering twinchargers if you want to read more.


Don't overlook the need to look at the fuelling when you are increasing the bhp and torque - it makes the car more thirsty. Most tuners we speak with say to over specify your flow rate on the injectors.

As a rule of thumb add 20% to the flow rate when specifying an injector, which takes into account injector deterioration and provides some spare capacity should the engine require more fuel.



You may need to increase your exhaust if the existing exhaust is creating a flow problem.

On most factory exhausts you'll find your flow rate is fine even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust.

Sports exhausts can help balance the flow of gases through the engine.


But if your exhaust pipe is too large, ie: over 2.5 inches bore, you will lose a lot of the flow rate and end up sapping power and torque.

Typically exhaust restrictions can be traced to the catalysts installed, so adding a faster flowing sports alternative is the answer. This keeps the car road legal and will flow much better due to it's higher internal surface area and design, so has the added benefit of keeping your car road legal. The alternative decat should be considered an off road only mod, as removing a catalyst is illegal in most territories and regions for road registered cars..

Weak spots, Issues & problem areas on the B57

The B57 engines are generally reliable and solid units, as long as you follow the manufacturers service schedules, and use a good quality oil to ensure longevity. Few problems should happen as long as they are regularly serviced and maintained.

Carbon build up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. We have tips on removing carbon build up.

Some of our members have had issues with flat spots or glitches after applying mods and upgrades or tuning, this is not usually related to this engines design, so instead see our article on diagnosing flat spots and problems after tuning which should help you get the bottom of this issue.

Regular oil changes are vital on the B57, especially when tuned and will help extend the life and reliability of the engine.

If you would like to know more, or just get some friendly advice on Tuning your B57 engine please join us in our friendly forum where you can discuss tuning options in more detail with our B57 owners. It would also be worth reading our unbiased tuning articles to get a full grasp of the benefits and drawbacks of each modification.

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