A Complete Overview – UroTuning


With over 40 many years of historical past, BMW’s M badge has prolonged represented the pinnacle of general performance in the client motorsport planet. At any time considering the fact that the initially M1 debuted, these cars have dominated streets and race tracks all about the planet.

Debuting below 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 legendary inline-six structure, the S55 signifies a transfer to downsize from the V-8s beneath the hood of the last technology of M vehicles. 

How does the S55 stack up compared to previous offerings? Study on to find out all about it.

Embracing Turbochargers

In the previous, the engines powering numerous of BMW’s M autos had been obviously-aspirated. The M collection has constantly taken care of a devoted subsequent of fans who take great delight in their cars and trucks and the engines that electricity them.

So, when the brand name declared that a turbo would be coming to the M collection, enthusiasts have been a bit worried, but a turbo-charged M motor vehicle signifies BMW embracing modern design and style elements. It truly is a change toward smaller kind aspects, improved gasoline financial system, and decrease emissions with the BMW overall performance elements you’ve developed to have faith in.

The S55 just isn’t BMW’s very first I6 supplying to feature a turbocharger. That distinction belongs to the N55 engine that to start with appeared mated to the F07 5-collection Gran Turismo.

The 3. L N55 went on to acquire several accolades. It appeared on Ward’s Top Ten Engines list for a few several years in a row and was voted 2014’s Motor of the Year in the 2.5-3. L category.

N55 and S55

After getting this kind of praise for their work with turbochargers and looking at the automotive landscape change to smaller engines, it built perception to keep on the pattern.

The S55 engine builds on the foundation laid by the N55. They each function the very same 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.

Having said that, the S55 packs a punch the N55 can’t match. Compared with the N55’s single turbo with twin-electricity technologies, the S55 attributes two traditional turbochargers.

The variations really don’t quit there. The S55 also functions Valvetronic technological innovation to enhance throttle response, reduce gas usage, and lower CO2 emissions. It can be an motor created with an eye towards present day concerns.

Other improvements include things like much more superior intercoolers to chill the motor, twin gasoline pumps, much better pistons, a superior-efficiency lightweight crankshaft, and a closed-deck engine bay.

Apart from the turbos, the closed-deck style is possibly the biggest advancement about the N55. It will allow for improved power output many thanks to better cylinder stress.

S55 Functionality

Many thanks to the twin-turbo configuration, the S55 has an amazingly even torque output. Even though this is real of most turbo-billed cars and trucks, the S55 lets you to faucet into wheel-spinning torque from as lower as 1850 RPM, and delivers it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos engineering is the reason that torque shipping and delivery is so consistent throughout the rev-band.

5500 RPM to 7300 RPM is the engine’s ideal effectiveness band, with its top velocity reachable at 7600 RPM. This motor is able of giving the two reliable torque application and an outstanding level of velocity.

In its inventory configuration, the S55 motor would make 425 HP and 406 lb-ft of torque. Even though these numbers are unquestionably outstanding, it can be capable of so substantially extra with a few upgrades.

The S55 engine also retains the record for the most strong BMW engine ever produced. BMW tuning introduced a intensely-modified version up to 1,150 HP at the wheels.

This engine’s twin turbos every produce up to 18 lbs of increase to the cylinders and occur with an electronic wastegate. Thanks to this style and design, the engine will not have to have a blow-off valve.

To make sure oil distribution even under restricted cornering, the S55 also boasts a secondary oil pump. This pump pushes oil from the sides of the pan into the motor.

The place To Discover the S55

The S55 is a highly-capable motor. It uncovered a house below the hood of a amount of production styles and effectiveness autos. 

In its stock variety, it powers the F80 M3, the F82 M4, and the F83 M4. 

A somewhat detuned model powers the F87 M2 CS Racing. Listed here, it helps make amongst 275 and 360 HP.

Other purposes in the M2 include the F87 M2 Competitors, wherever the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.

On large-general performance M3s, the S55 can be observed powering the F80 M3 Competition earning 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 general performance applications incorporate the F82 and F83 M4 Levels of competition with 444 HP, the F83 M4 CS Racing with 453 HP, the F82 M4 GTS, and F83 M4 GTM Winner Version. The latter two equally function 493 HP many thanks to a h2o injection method.

Is the S55 Trustworthy?

As the several years move by, the S55 proceeds to demonstrate to be a rather dependable engine. Like all BMW engines, it does sometimes experience problems like superior-stress fuel pump failure and carbon create-up, but those challenges are comparatively unusual.

The only major challenge that allegedly influenced a several of these engines was a spun crank hub. Simply because it borrowed the crank hub structure from the N54 and N55 engines, some claimed early editions of the N55 engine expert crank hub problems.

However, BMW improved the style and design of the crank hub in 2016, which seemed to place an conclusion to the concern. It turned out that TPG Tuning, an aftermarket sections producer, had wildly exaggerated statements in an effort and hard work to provide far more of their merchandise.

Aside from the crank hub scare, the S55 has no major concerns to report. A lot of of these engines are still likely solid much more than 8 years from their first creation day.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 engine is an outstanding energy plant. It brought turbo capabilities to the M series when it first appeared in 2014 with the BMW M3 and BMW M4.

It can be an advancement of the award-successful N55 engine, and it options twin turbochargers and a host of other upgrades.

Want to upgrade your BMW 3-series? UroTuning is your supply for BMW areas. Search our collection of products and solutions nowadays.


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