BMW S58 Tuning Mods

"All you need to know about tuning the BMW S58 engine!"

The BMW S58 have loads of potential and with the best mods & upgrades can make serious power. Tuning parts like tunes remapping or flashing, turbo improvements and fuel upgrades will greatly enhance your driving pleasure.

The BMW S58B30T0 engine is a high-performance powerplant known for its use in M models, offering impressive power and features. Here's an overview of the S58B30T0 engine:

The S58B30T0 engine is an inline-six configuration, which is a hallmark of BMW's M models. This layout provides a balance between power, smoothness, and responsiveness.

The S58B30T0 engine is a relatively recent addition to BMW's lineup, with production starting in 2019. It has been used in a range of M models, including the BMW X3 M, X4 M, and M3.

This engine is equipped with a twin-turbocharging system, which means it has two turbochargers. This setup boosts the engine's power by compressing the incoming air, resulting in significant power gains.

The S58B30T0 engine is known for its impressive power output, delivering well over 500 horsepower in some applications and can theoretically push out in excess of 700hp with the right bolt on mods.

It features direct fuel injection, a technology that allows for precise control of the fuel-air mixture in the combustion chamber, enhancing power and fuel efficiency with two high-pressure fuel pumps operating in alternation or simultaneously to meet high-speed fuel delivery demands.

Like many modern BMW engines, the S58B30T0 engine is equipped with Valvetronic technology, a system that adjusts the lift of the intake valves. This optimizes airflow into the cylinders for improved power and efficiency.

It offers exhilarating acceleration and handling characteristics, aligning with BMW's M philosophy.

Here we examine S58 tuning and report on the best upgrades. BMW S58B30T0 are popular engines and with the ultimate sports modifications like remapping, turbo kits and camshafts you will substantially maximise your driving opportunities.

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History, Power & Specs of the Engine

Straight-six Displacement 3.0 L (183 cu in) based on the B58 block essentially an M version was created to become the S58

S58B30T0
353 kW (480 PS 473 hp) at 6,250 rpm)  (443 lbft) at 2600–5950 rpm 2
019

  • 2019-present F97 X3 M
  • 2019-present F98 X4 M
  • 2020-present G80 M3

S58B30T0
375 kW (510 PS 503 hp) at 6,250 rpm (443 lbft) at 2600–6250 rpm 2019

  • 2019-present F97 X3 M Competition
  • 2019-present F98 X4 M Competition
  • 2020-present G80 M3 Competition

Tuning the BMW S58 and best S58 performance parts.

Best S58 upgrades

The top S58 parts on an engine are sensibly the ones that give the best value for money.

We won't be swayed by popular S58 parts, they need to be cost effective.

Heat is a big issue on these engines, and BMW provided an array of radiators and oil coolers to keep these down and it works quite well.

The map and fuel pump and injectors also will make differences on the power gains you'll achieve.

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.

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Best mods for your S58

  1. Upgrades to turbochargers - Adding a hybrid turbocharger is the most significant way to raise the intake air supply, this means you are able to utilize more fuel and make more power. Although one of the most expensive upgrades it offers big gains.
  2. ECU Tunes - A tune/remap gives the most power for your outlay, replacement ECUs, and Tuning boxes are all alternatives.
  3. Fuel Rail & Injector Upgrades - Port injection kits are great ways to add more power. ideally you want to keep the throttle body and charge tract in it's original position. Vargas produce a popular kit with 900cc & 500cc injector options proving popular choices.
  4. Heat is a big issue on these engines, and BMW provided an array of radiators and oil coolers
  5. Intake Upgrades and Exhaust - Please note that on their own these mods will NOT ADD POWER on most cars, but they can help release power after other mods by losing a restriction.
  6. Lighter flywheels - a reduced weight flywheel will improve the engines rev changes. But not always suitable for all S58 engines.
  7. Flowing and porting the Head - Head work will get air flowing into the engine while removing turbulence or restrictions.

S58 ECU Tunes

Engine tuning or remapping is a highly effective method to maximize power for your investment when it comes to the S58B30T0 engine.

This modification involves adjusting the engine control unit (ECU) to optimize various parameters, such as air-fuel mixture and ignition timing, to enhance performance.

It's renowned for providing substantial power gains and is considered the most cost-effective option for increasing engine output.

Alternative approaches include aftermarket ECU upgrades and tuning boxes, allowing for fine-tuning and adjustment of engine performance according to your preferences.

The "BM3" or "BootMod3" is a popular aftermarket engine tuning platform for the S58 with good community support and flexibility.

It's a software tuning solution that allows enthusiasts to modify and optimize the engine's performance by reprogramming the engine control unit (ECU) or digital motor electronics (DME) of their BMW cars.

BootMod3 is one of several available tuning options for BMW vehicles and is known for its flexibility and ease of use.

BootMod3 enables users to adjust various parameters in the ECU, including fuel and ignition mapping, turbocharger boost levels, throttle response, and more.

This allows for fine-tuning the engine's performance characteristics.

Users can customize their engine tunes according to their preferences and the specific modifications they've made to their vehicles.

The system offers data logging capabilities, allowing users to monitor various engine parameters in real-time, which can be valuable for diagnosing issues and fine-tuning the performance.

BootMod3 is designed to be user-friendly and can be installed or removed relatively easily.

Dyno Tuning and Monitoring: To ensure the engine runs optimally and safely, it's crucial to have the vehicle professionally dyno-tuned with the new fueling components and modifications.

Regular data logging and monitoring of parameters such as air-fuel ratio, fuel pressure, and exhaust gas temperatures are essential to maintaining engine health and performance.

Heat Management:

The S58B30T0 engine is known for generating significant heat during high-performance operation.

BMW addresses this concern by offering a range of radiators and oil coolers designed to dissipate heat effectively.

Many aftermarket tuners look to improve cooling with greater capacity radiators/coolers.

Ensuring proper heat management is crucial when modifying the engine to maintain optimal operating temperatures, which in turn, improves performance and durability, particularly under high-stress conditions.

S58 Tuning Stages

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

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

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

Tuning Mods & performance upgrades of the BMW S58B30T0 engine involves a combination of modifications to achieve best results.

Enhancements like turbocharger upgrades, engine tuning, efficient heat management, improved intake and exhaust systems, lighter flywheels, and head modifications all significantly increase power and enhance performance.

It's wise to carefully consider your upgrade options and establish a power target to avoid costly mistakes.

The primary objective of any engine modification project is to introduce more air into each cylinder.

The intake plenum plays a crucial role by drawing air from the air cleaner during the intake phase and delivering it, along with fuel, to the engine cylinders during compression.

The size, shape, and flow capacity of intake manifolds can notably impact fuel atomization and engine efficiency in the S58.

While many factory-made intake manifolds are suitable for daily use, some motorsport parts can substantially improve performance.

Installing larger valve kits, performing port work, and optimizing head flow also result in increased performance, providing additional benefits by enhancing the impact of other tuning modifications.

Turbo upgrades

Upgrades to Turbochargers: Compared to the B48 the S58 employs two single-scroll turbochargers, each with its electrical wastegate actuator.

Adding hybrid turbochargers represents one of the most significant ways to increase the intake air supply to the S58B30T0 engine.

This enhancement allows the engine to ingest more air, enabling the combustion of additional fuel and resulting in substantial power gains.

While this modification can be one of the costlier upgrades, it offers substantial and transformative power increases, making it a popular choice for enthusiasts seeking the highest levels of performance from their S58 engine.

The more air you can get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes major power gains. On the S58 you'll find the stock turbos should handle up to 700-750wheel horsepower.

The twin scroll setup works really well on the S58 and the intake area contains some clever tech to maintain boost and the fast responding wastegate make this a very responsive engine. It does feel like BMW have taken the S58 to the max and left only a little room for improvement, which is a nice problem to have.

When it comes to upgrades the most popular unit is the Stage 2+'s from Pure Turbos.

Pure Turbos are renowned the world over for their exceptional reliability and outstanding performance.

It's not unheard of mechanics spending a loads of money on turbocharger upgrades on the S58 only to suffer the indignity of watching the engine block literally blow up on it's first outing after it's been completed.

Bigger capacity turbos will usually suffer low end lag, and smaller turbos spool up more quickly but do not have the high rpm bhp gains.

Thanks to new tech the world of turbo chargers is always moving on and we are seeing variable vane turbo chargers, where the vane profile is altered according to speed to lower lag and increase top end performance.

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

You'll commonly see there is a restriction in the air flow sensor AFM/MAP on the S58 when considerably more air is being sucked into the engine.

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

Adding a supercharger or additional turbo will make large bhp gains, although more complex to get working. We have this guide to twinchargers if you want to read more.

S58 Fuelling Upgrades (Port Injection, Injectors, HPFP etc..)

You will need to ensure that the engine is not starved of fuel so will have to uprate the fuelling when you start going beyond 20% of a bhp increase.

Most tuners we speak with say to be generous with your flow rate on the injectors.

The rule of thumb is to add 20% to the flow rate when specifying an injector, this accounts for injector deterioration and allows some spare capacity should the engine require more fuel.

Both the B58TU and S58 engines have a fuel pump pressure of 350 bar. The S58 features two high-pressure fuel pumps operating in alternation or simultaneously to meet high-speed fuel delivery demands

Focus on the HPFP and Injectors to maximize the fuel delivery. Due to the complex nature of the dual fuel pumps on these we have seen some strange fuel related error codes that were quite hard to track down.

Injection pressures on the S58 were tweaked and raised from 200bar to 350bar.

Improving fuel delivery on the BMW S58 engine, especially when considering running E85 fuel or increasing power output, can be a complex but rewarding process.

High-Pressure Fuel Pump (HPFP): Upgrading the HPFP is a common modification for S58 engines, particularly when aiming to run higher ethanol blends like E85. The stock HPFP may not provide sufficient fueling for increased power levels.

Aftermarket HPFP upgrades are available to ensure a higher and more consistent fuel flow.

Injectors:

To support higher power levels and E85 fuel, you may need to consider upgrading the injectors. Larger, high-flow injectors are often required to deliver the increased fuel volume necessary for E85 or other high-performance applications.

Port Injection: In addition to the stock direct injection (DI) system, adding a supplementary port injection (PI) system is a popular approach for running E85 and optimizing fuel delivery. Port injection systems provide additional fueling capacity and are controlled by an auxiliary ECU. The combination of DI and PI allows for precise and flexible fuel management.

The Fuel-It! S58 BMW Port Injection Kit is a quick, plug & play fueling solution for S58-powered BMWs. It features six low-pressure fuel injectors, supporting up to 1000+ whp with various fuels like pump gas, race gas, methanol, and E85.

Made in the USA, the CNC-machined and anodized kit includes all you would need apart from a stand-alone controller, or BMS JB4 Controller

The kit uses standard EV14 42mm injectors (550cc, 750cc, or 950cc flow ratings). You must use a controller to operate the additional injectors.

If you're using a JB4, choose the BMS port injection controller. If not, and you're running a flash or factory ECU, a stand-alone (flash only) controller is needed.

For ethanol mixes or E85, consider their flex fuel kit to integrate with the JB4 and monitor ethanol content

E85 Tuning:

When switching to E85, it's essential to have a proper tune that adjusts the engine's parameters, including fueling, timing, and boost levels, to optimize performance and take full advantage of the higher octane rating and cooling properties of E85.

Custom tuning or using platforms like BootMod3 is often necessary for E85 setups.

Upgrading other components of the fuel system, such as fuel lines and pumps, may be necessary to handle the demands of E85 and higher power levels.

Ensure that the entire fuel system is capable of supporting the intended modifications.

The Fuel-It! S58 BMW Port Injection Kit is a quick, plug & play fueling solution for S58-powered BMWs. It features six low-pressure fuel injectors, supporting up to 1000+ whp with various fuels like pump gas, race gas, methanol, and E85. Made in the USA, the CNC-machined and anodized kit includes all you would need apart from a stand-alone controller, or BMS JB4 Controller

The kit uses standard EV14 42mm injectors (550cc, 750cc, or 950cc flow ratings). You must use a controller to operate the additional injectors.

If you're using a JB4, choose the BMS port injection controller. If not, and you're running a flash or factory ECU, a stand-alone (flash only) controller is needed.

For ethanol mixes or E85, consider their flex fuel kit to integrate with the JB4 and monitor ethanol content.

Ethanol Content Sensor:

Installing an ethanol content sensor can provide real-time feedback on the ethanol content in the fuel, allowing the engine management system to adjust fueling accordingly. This is particularly important when running E85, as ethanol content can vary.

Fuel Quality:

When running E85, it's essential to ensure that the fuel is of high quality and meets appropriate standards. Contaminated or low-quality E85 can have adverse effects on engine performance and reliability.

Intake Upgrades and Exhaust

Enhancements to the air intake system and exhaust components are important for optimizing the S58B30T0 engine's performance.

The S58 engine shares some components with the B58TU but introduces new developments with an emphasis placed on reducing pressure losses in the intake and exhaust systems for better efficiency and responsiveness.

S58 has two snorkels directing air into the engine cover, which also serves as an intake muffler housing a larger air filter than the B58.

This makes it harder to source better aftermarket upgrades, as the M division did a pretty good job, keeping the power and torque delivery where you need it most.

While these modifications may not independently add power, they significantly contribute to the engine's potential by removing restrictions.

A free-flowing air intake and performance exhaust allow for better airflow, enhancing overall efficiency and power output.

These upgrades are particularly effective when combined with other performance modifications, as they release additional power by reducing flow restrictions.

Lighter Flywheels

Reducing the weight of the flywheel is a valuable modification for the S58B30T0 engine.

A lighter flywheel improves the engine's ability to change revs more quickly, resulting in enhanced throttle response and an overall more responsive and engaging driving experience.

However, it's crucial to note that this modification may not be suitable for all S58 engines, as it can impact low-end torque, which should be carefully considered based on your specific driving preferences.

Flowing and Porting the Head

Head work, involving porting and flowing the cylinder head, is a critical performance enhancement for the S58B30T0 engine.

The primary goal is to optimize airflow into the engine while eliminating turbulence and restrictions. This modification plays a pivotal role in improving the engine's breathing, allowing it to maximize the benefits of other performance-enhancing upgrades.

When combined with other enhancements, it provides significant power gains and overall efficiency improvements.

Exhaust

You should look to increase your exhaust if the current exhaust is actually creating a flow problem.

On most factory exhausts you'll see the flow rate is still ok 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 balance the flow of gases through the engine.

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

Usual exhaust restrictions can be traced to the emissions filters installed, so adding a higher flowing race alternative such as a sports catalyst pretty much removes this restriction, thanks to it's larger size and surface area, and will effectively raise the performance to levels you would expect without having a catalyst installed, but keeps the car road legal.

Weak spots, Issues & problem areas on the S58B30T0

The S58 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.

Please let us know if there are any other problems or issues we have missed. and are better made and have fewer problems than the B58 it was based on .

Regular oil changes are vital on the S58, 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 S58 engine please join us in our friendly forum where you can discuss tuning options in more detail with our S58 owners. It would also be worth reading our unbiased tuning articles to get a full grasp of the benefits and drawbacks of each modification.

Please help us improve these tips by sending us your feedback in the comments box below.

We love to hear what our visitors have got up to and which modifications work best for you on your car. Which helps us keep our guides and tips up to date helping others with their modified car projects. Your feedback and comments are used to keep this page up to date, and help improve the accuracy of these S58 tuning guides which get regular updates and revisions.

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