BMW B58 Engine Tuning How Can You Improve Your Performance?

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Estimated reading time: 9 min

B58 Engine Specs and Design
Introduced in 2015, the B58 is now considered one of the best BMW engines
ever, its success confirmed by getting on the list of Ward’s 10 Best Engines
in 2016, 2017, 2019, and 2020. No wonder the factory numbers speak for
themselves, and they do sound impressive:

* 322-382 HP (depending on the variant and application)
* 450-500 Nm of torque
* 7,000 RPM redline so you know it likes to rev!

Not only is the B58 powerful and very advanced, it’s also designed in a
very smart and interesting way. What do we mean by that?

First of all, the B58 is modular. As a part of BMW’s new B engine family,
it shares many parts with its smaller brothers, namely the 3-cylinder B38 and
the 4-cylinder B48 motors. Since all of them have the same displacement of
0.5L per cylinder, it’s easy to guess that even some of the internal parts
are interchangeable between the particular variants.

What’s more, the gasoline-powered B58 has the same crankshaft as its Diesel
cousin, the B57 (a replacement for the renowned N57 engine). Why is that
important? Well, in theory, more engines using the same parts means that it
should be easier to maintain the unit and find aftermarket replacement parts.
It’s also cheaper for the manufacturer to have only one production line
making the same crankcase for two different engines, rather than having two
separate lines for both of them.

Lastly, the B58 has a closed-deck engine block. Although this causes the
entire unit to be a little bit heavier than its open-deck predecessor, it
results in increased durability, necessary when working with a boost pressure
that is 20% higher than that of the N55 engine.

This is also why apart from it being so reliable, the B58 might turn out to
be one of the better BMW engines for tuning to date of course, as long as it
doesn’t run on the latest software. It is in fact the I-Level software
version that ultimately determines whether your B58 engine can be tuned or

However, before we focus on the BMW B58 chip tuning, let’s see how it
stacks up when compared to its bigger brother, the S58.

B58 vs. S58 EnginesThe S58 is similar to the B58, but meant for the
range-topping M models, although chronologically speaking, the S58 engine is
the younger of the two it was introduced in 2019. However, when we compare
them in terms of their specs, the S58 packed with BMW performance upgrades
straight from the factory has obviously got more muscle, so it’s only right
to call it the big bro.

How different are these engines? Apart from beefed-up internals and
different cylinder dimensions, there are twin turbos in the unit meant for
the M-badged vehicles, instead of one twin-scroll turbo in the civilian

All of that and a special BMW S58 engine tuning result in:
* 473 or 503 HP (again, depending on the application)
* 600 Nm of torque
* 7,200 RPM redline, even higher than in the B58

We’ll tell you right away that ECU chip tuning alone won’t bring the
performance of your B58 to the above levels found in cars such as BMW M3, BMW
M4 or their Competition variants. However, it doesn’t mean that there is no
room for improvement.

Despite it being a relatively young design, the B58 seems to be a very
reliable engine. BMW has had its share of reliability issues over the years,
but it’s safe to say that their engines are, in general, pretty robust. After
all, there are countless bimmers with a few hundred thousand on their
odometers still driving, without any major maintenance.

Anyway, the flaws of the B58’s predecessors surfaced within 2-6 years after
their introduction, whereas with this engine no major problems have been
noted so far. Moreover, BMW shares their B58 engines with none other than
Toyota, who are regarded kings of automotive reliability new Supras are
powered by this engine, so it has to be dependable!

Add to it the way BMW B58 engines are designed, with capable cooling,
strong blocks, a heat encapsulation system that makes them warm-up faster
(therefore preventing engine wear), and you get a package that should last
for years and it’s possible to improve its longevity even more!

Read on to see how Perfected Performance BMW engine tuning can further
increase the reliability of the B58 in your car.

Currently, the BMW B58 engine can be found in most of the current 40i and
M-badged 40i BMW models as well as some of the F generation cars. This list

* BMW 340i (F30/F31/F34)
* BMW 440i (F32/F33/F36)
* BMW M140i (F20/F21)
* BMW M240i (F22/F23)
* BMW X5 40i (G05)
* BMW X7 40i (G07)
* BMW Z4 M40i (G29)
* BMW 540i (G30/G31)
* BMW 640i (G32)
* BMW X6 (G06)
* BMW 740i (G11/G12)
* BMW 840i (G14/G15/G16)
* BMW M340i (G20/G21)
* BMW X3 M40i (G01)
* BMW X4 M40i (G02)
* BMW M440i (G22)
* BMW M240i (G42)

The M Power trims come with the 382 HP variant of the B58, while the non-M
cars put out 335 HP. It’s worth noting that the newest generations of BMW
cars have the updated B58 engines. Pre-update versions were rated at lower
power levels, from 322 to 355 HP.

Okay, okay, let’s get to the fun part now. What we call Perfected
Performance is basically a custom remap of your engine provided as a remote
tuning service. As you can see, because of the way the B58 is designed, there
is still potential for more, even though it’s already a powerful engine
straight out of the factory.

But from the factory are the keywords here: not only do carmakers have to
comply with certain emission laws, they also have to take into account the
fact that all engines coming off of the same assembly line are. never the
same. What do we mean by that? Well, it all comes down to tolerances, the way
certain elements are put together, and the very slight differences in finish
of all the interacting surfaces.

Because of that, all ECUs get the same, universal mapping, since tuning
each and every one of them separately would drastically increase production
cost for the manufacturer. Also, factory tunes tend to operate at higher
temperatures to make the parts wear off faster than they could, which results
in more frequent workshop visits, part replacements, and more expensive

Luckily, if you want to increase the power or improve fuel economy and the
reliability of your car, there is a way you just have to let us unlock the
potential of your engine, through a custom BMW ECU tune.

Perfected Performance tuning will be available soon! Sign up to our
newsletter to be the 1st to know when it comes out.

What Will Change?
If you decide that you do want a BMW chip tuning, you can expect changes in
three areas.

    1. Performance
Careful tweaking of the engine parameters results in more torque, which
means more flexibility without changing gears so often as well as smoother
power delivery. Which means that you’ll be able to accelerate with full
confidence when overtaking or merging on a highway and your car won’t
suffocate on lower revs.

    2. Fuel Consumption
Since the new tune is fully customized, the injectors of your engine
provide a more precise fuel dose, so that when driving normally you will
actually use less gasoline than before. This way, you obviously save money on

    3. Durability
Thanks to the lowered operating temperature after the tune, you’ll take a
few years off your BMW, as the longevity of your engine and its components is
also increased.

So, not only will your car become more exciting to drive when you’ll feel
like pushing it as if you were experiencing it for the first time you’ll also
experience better fuel economy during your normal commute, and your BMW will
last you longer due to higher durability. 

What Does the Chip Tuning Process Look Like?
As mentioned earlier, Perfected Performance tuning service is performed
remotely. After you book the tuning session with our specialist, you will get
specific coding preparation instructions, but all you need for the entire
process is an ENET cable, a laptop, and 1 hour of your time.

What’s most important is the fact that you don’t need any technical
expertise, apart from knowing where to plug in the cable. Before the session,
you’ll be given all instructions on how to prepare your car and laptop for
the engine tuning process.

During the tuning process, our technician will follow a car tune-up
1. Scan the data from the ECU of your car.
2. Implement and save appropriate changes in the ECU software.

Although it may seem pretty easy the way we described it, engine tuning
actually requires a lot of expertise. Incorrect parameter changes may result
in increased wear and tear of the engine components or even major mechanical
failures. Our Perfected Performance service takes care of that: instead of
having to learn the complexities of engine tuning yourself, let our
professional BMW tuner handle the difficult stuff.

Doesn’t it sound simple and effortless?

Is BMW B58 Tuning Safe?
Yes, it is! The B58 is a very durable engine that can take additional power
with no problem. Moreover, our B58 tune is within the factory limits and
exhaust emission standards of your BMW we want to make your driving
experience more enjoyable, but we also want your car to last you as long as

That being said, we advise that your car is in good condition (i.e., there
are no engine-related warning lights on your dashboard) before you decide on
any tuning. If you’ve made any previous mods, ECU tuning or parts, be sure to
tell us about it. As we’ve explained, proper tuning will actually lower the
engine operating temperature, extending the engine’s life, so checking your
vehicle is only a precautionary measure.

If you take care of your bimmer and perform regular maintenance on schedule
(e.g., oil changes or spark plug inspections), you are most likely good to
go. However, if your car is poorly maintained, you might want to reconsider
tuning it or check it on a dyno first, to see if everything is running as it

If your BMW’s engine is still under warranty, you have to take under
consideration that chip tuning will void it. Note that it applies only to the
warranty of your drivetrain, not the entire vehicle.

Can You Untune a Car?
We’ll just confirm what you may have already guessed: since it relies on
software changes, engine tuning is fully reversible. This is also what sets
Perfected Performance apart from the other remote tuning services not only
can we help you change the performance of your car, we can also restore the
factory settings if you choose to do so.

Did we mention that we offer a money back guarantee along with a
free-of-charge ECU reset.? During the first 14 days, you get a satisfaction
guarantee. Even if you decide that our tune is not enough (or too much) after
the 14 days, we can still help you bring your car back to its factory state,
although for a small fee.

Perfected Performance vs other engine tuning options
So how is Perfected Performance different from other engine tuning options
out there? Check out the key differences:

The way our engine tuning is performed, no other performance upgrades are
needed: your car will be still operating well within the safety limits of its
components. Having that in mind, there are certain retrofits worth
considering if you want to further improve the performance of your car, like
better intercoolers or downpipes, or even a BMW B58 turbo upgrade. However,
let’s focus on the first two.

BMW B58 Intercooler Upgrades

As you probably already know, intercoolers lower the temperature of the air
that gets sucked into the engine by the turbocharger. The colder the intake
air, the denser it is, which allows for more fuel to be burned and,
obviously, more power to be produced. The difference in density between hot
and cold air is caused by the distance between the air molecules; when
heated, they move further apart from each other, so the volume of the air
expands. Since its mass remains the same despite heat, the density of the air

Lower air temperature also results in a lowered engine operating
temperature, so its longevity increases. Let’s also not forget that the
colder air decreases the chance of pre-ignition or engine knocking, which is
when the fuel detonation that occurs as a result of incorrectly timed fuel
ignition causes a loud metallic pinging noise.

Now when it comes to the intercooler of the B58 engine, it’s already very
efficient from the factory. It is of the air-to-liquid design, so the heat exchange
is further aided by the coolant flowing in its core. However, though not
necessary even after our tune, an improvement of the cooling system will
definitely not hurt your car. By using a more performance-oriented BMW B58
intercooler, you can increase the reliability and safety margins even more.

Technically speaking, an intercooler upgrade alone can also increase the
power gains, due to the lowered intake air temperature. It’s worth noting
though that to fully take advantage of the more efficient cooling, another
engine tune will be required the part itself will only provide slight
increases in this regard.

BMW B58 Downpipe Upgrades
BMW B58 Downpipe UpgradesAnother popular upgrade option for a tuned car is
the downpipe upgrade. What is a downpipe? It’s a section of tubing that
connects the turbocharger to the exhaust system, and it directly affects how
efficiently the turbo can produce boost.

Downpipes, like most engine and exhaust elements, are designed with
emission standards and production cost optimization in mind. They contain
catalytic converters and their diameter is wide enough to provide enough air
flow for the factory performance, with the consideration of the reliability

Stock BMW B58 downpipe can easily handle a moderate tune, but if you plan
on gaining more power from your engine remap, less restrictive pipes are
going to be necessary. Again, as with the intercooler upgrade, all
performance BMW parts (especially engine retrofits) require additional tuning
to unlock the full potential of new, more efficient parts.

If you want more from your BMW, but at the same time you would like to
improve its fuel economy, engine tuning is definitely something worth
considering. The thrills of driving down twisty roads will increase, while
the thrills you get at the fuel pump will decrease. That is, you’ll have to
refuel less often. Perfected Performance also means that the longevity of
your engine components will be greater.

However, you have to remember that although reversible and safe when made
by an experienced professional, all software changes in your car’s ECU will
void the manufacturer’s warranty. 

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