A Complete Overview – UroTuning


With above 40 decades of heritage, BMW’s M badge has extended represented the pinnacle of effectiveness in the buyer motorsport environment. Ever since the to start with M1 debuted, these autos have dominated streets and race tracks all about the planet.

Debuting underneath the hood of the BMW M3 and BMW M4 in 2014, the S55 engine is subsequent in line from this prestigious motorsport team.

Returning to their famous inline-6 layout, the S55 signifies a go to downsize from the V-8s below the hood of the very last technology of M cars and trucks. 

How does the S55 stack up in contrast to prior choices? Read through on to study all about it.

Embracing Turbochargers

In the past, the engines powering many of BMW’s M cars and trucks were being by natural means-aspirated. The M sequence has generally managed a devoted subsequent of fans who acquire excellent pride in their cars and trucks and the engines that energy them.

So, when the brand name introduced that a turbo would be coming to the M sequence, lovers were being a bit anxious, but a turbo-charged M vehicle signifies BMW embracing contemporary style factors. It really is a shift toward smaller sized variety components, improved fuel overall economy, and decreased emissions with the BMW general performance parts you’ve grown to have faith in.

The S55 isn’t really BMW’s first I6 featuring to element a turbocharger. That distinction belongs to the N55 motor that initial appeared mated to the F07 5-collection Gran Turismo.

The 3. L N55 went on to receive quite a few accolades. It appeared on Ward’s Best 10 Engines checklist for a few several years in a row and was voted 2014’s Engine of the Yr in the 2.5-3. L class.

N55 and S55

Soon after receiving these kinds of praise for their work with turbochargers and looking at the automotive landscape change to more compact engines, it designed perception to carry on the pattern.

The S55 motor builds on the basis laid by the N55. They equally aspect the similar 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.

However, the S55 packs a punch the N55 are not able to match. Not like the N55’s single turbo with twin-ability technologies, the S55 functions two vintage turbochargers.

The variances will not halt there. The S55 also options Valvetronic technologies to increase throttle response, lessen gas intake, and lessen CO2 emissions. It truly is an motor created with an eye toward modern-day considerations.

Other improvements involve extra sophisticated intercoolers to chill the engine, twin gas pumps, more robust pistons, a high-performance light-weight crankshaft, and a shut-deck engine bay.

Aside from the turbos, the shut-deck design is perhaps the most important enhancement about the N55. It permits for enhanced electrical power output thanks to larger cylinder tension.

S55 Effectiveness

Many thanks to the twin-turbo configuration, the S55 has an incredibly even torque output. Whilst this is accurate of most turbo-charged cars, the S55 allows you to tap into wheel-spinning torque from as small as 1850 RPM, and provides it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos know-how is the explanation that torque delivery is so consistent across the rev-band.

5500 RPM to 7300 RPM is the engine’s optimal functionality band, with its major velocity reachable at 7600 RPM. This motor is capable of providing both constant torque software and an outstanding price of speed.

In its inventory configuration, the S55 motor helps make 425 HP and 406 lb-ft of torque. Even though these numbers are undoubtedly spectacular, it truly is capable of so much far more with a handful of upgrades.

The S55 engine also retains the file for the most potent BMW motor ever manufactured. BMW tuning brought a heavily-modified model up to 1,150 HP at the wheels.

This engine’s twin turbos every single make up to 18 lbs of increase to the cylinders and appear with an electronic wastegate. Thanks to this layout, the motor won’t need a blow-off valve.

To ensure oil distribution even below limited cornering, the S55 also features a secondary oil pump. This pump pushes oil from the sides of the pan into the motor.

In which To Discover the S55

The S55 is a very-capable engine. It observed a residence below the hood of a quantity of generation models and general performance automobiles. 

In its inventory sort, it powers the F80 M3, the F82 M4, and the F83 M4. 

A somewhat detuned version powers the F87 M2 CS Racing. Here, it tends to make among 275 and 360 HP.

Other applications in the M2 include the F87 M2 Opposition, where by the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.

On large-efficiency M3s, the S55 can be observed powering the F80 M3 Competitors building 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 performance applications contain the F82 and F83 M4 Competitiveness with 444 HP, the F83 M4 CS Racing with 453 HP, the F82 M4 GTS, and F83 M4 GTM Champion Edition. The latter two equally feature 493 HP many thanks to a h2o injection program.

Is the S55 Trustworthy?

As the yrs go by, the S55 carries on to verify to be a quite reliable motor. Like all BMW engines, it does from time to time encounter challenges like large-force fuel pump failure and carbon create-up, but these issues are reasonably scarce.

The only major concern that allegedly impacted a handful of of these engines was a spun crank hub. Mainly because it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 motor knowledgeable crank hub issues.

Even so, BMW enhanced the style and design of the crank hub in 2016, which seemed to place an conclude to the situation. It turned out that TPG Tuning, an aftermarket parts company, had wildly exaggerated promises in an work to provide a lot more of their items.

Apart from the crank hub scare, the S55 has no major concerns to report. Several of these engines are even now likely solid a lot more than eight yrs from their original output date.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 engine is an remarkable electricity plant. It introduced turbo abilities to the M series when it very first appeared in 2014 with the BMW M3 and BMW M4.

It’s an enhancement of the award-successful N55 engine, and it functions twin turbochargers and a host of other updates.

Want to improve your BMW 3-sequence? UroTuning is your supply for BMW areas. Look through our assortment of merchandise currently.


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