A Complete Overview – UroTuning


With about 40 decades of heritage, BMW’s M badge has very long represented the pinnacle of efficiency in the shopper motorsport globe. Ever since the initially M1 debuted, these vehicles have dominated streets and race tracks all over the earth.

Debuting under the hood of the BMW M3 and BMW M4 in 2014, the S55 engine is next in line from this prestigious motorsport group.

Returning to their legendary inline-six structure, the S55 signifies a move to downsize from the V-8s beneath the hood of the final generation of M vehicles. 

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

Embracing Turbochargers

In the past, the engines powering many of BMW’s M vehicles have been obviously-aspirated. The M collection has constantly managed a devoted subsequent of enthusiasts who get terrific delight in their automobiles and the engines that electricity them.

So, when the model announced that a turbo would be coming to the M series, fans were a little bit involved, but a turbo-billed M vehicle represents BMW embracing contemporary style factors. It really is a change towards more compact type factors, improved gas economic climate, and reduce emissions with the BMW overall performance parts you’ve grown to belief.

The S55 is just not BMW’s to start with I6 offering to element a turbocharger. That distinction belongs to the N55 engine that 1st appeared mated to the F07 5-series Gran Turismo.

The 3. L N55 went on to obtain various accolades. It appeared on Ward’s Major Ten Engines checklist for three yrs in a row and was voted 2014’s Motor of the Yr in the 2.5-3. L classification.

N55 and S55

Soon after getting these kinds of praise for their perform with turbochargers and observing the automotive landscape change to smaller engines, it designed feeling to continue on the pattern.

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

On the other hand, the S55 packs a punch the N55 cannot match. Unlike the N55’s single turbo with twin-energy technological innovation, the S55 characteristics two basic turbochargers.

The distinctions never stop there. The S55 also features Valvetronic technological innovation to improve throttle response, decrease gas use, and lessen CO2 emissions. It is an motor built with an eye toward modern problems.

Other enhancements consist of far more advanced intercoolers to chill the engine, twin gasoline pumps, more powerful pistons, a higher-overall performance lightweight crankshaft, and a closed-deck motor bay.

Apart from the turbos, the closed-deck design is most likely the most significant advancement more than the N55. It lets for improved electricity output thanks to bigger cylinder strain.

S55 Functionality

Many thanks to the twin-turbo configuration, the S55 has an amazingly even torque output. While this is accurate of most turbo-billed vehicles, the S55 enables you to faucet into wheel-spinning torque from as minimal as 1850 RPM, and provides it linearly all the way to 5500 RPM.

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

5500 RPM to 7300 RPM is the engine’s best general performance band, with its major pace reachable at 7600 RPM. This engine is able of providing both equally reliable torque application and an incredible fee of pace.

In its inventory configuration, the S55 motor makes 425 HP and 406 lb-ft of torque. Even though these numbers are unquestionably remarkable, it is able of so substantially additional with a handful of upgrades.

The S55 engine also retains the record for the most effective BMW motor ever manufactured. BMW tuning introduced a greatly-modified edition up to 1,150 HP at the wheels.

This engine’s twin turbos each individual make up to 18 kilos of increase to the cylinders and appear with an digital wastegate. Many thanks to this design and style, the motor doesn’t need to have a blow-off valve.

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

Wherever To Find the S55

The S55 is a remarkably-capable motor. It observed a household beneath the hood of a variety of output products and overall performance automobiles. 

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

A a little bit detuned edition powers the F87 M2 CS Racing. Listed here, it can make in between 275 and 360 HP.

Other applications in the M2 involve the F87 M2 Levels of competition, exactly where the motor produces 405 HP, and the F87 M2 CS racing with 444 HP.

On higher-functionality M3s, the S55 can be located powering the F80 M3 Opposition making 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 general performance applications include things like 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 Edition. The latter two both equally function 493 HP thanks to a water injection program.

Is the S55 Dependable?

As the a long time go by, the S55 continues to show to be a quite reliable motor. Like all BMW engines, it does at times working experience issues like higher-stress gasoline pump failure and carbon make-up, but all those challenges are rather unusual.

The only big issue that allegedly afflicted a few of these engines was a spun crank hub. Due to the fact it borrowed the crank hub design from the N54 and N55 engines, some claimed early editions of the N55 engine expert crank hub challenges.

On the other hand, BMW improved the design and style of the crank hub in 2016, which seemed to place an finish to the difficulty. It turned out that TPG Tuning, an aftermarket components company, experienced wildly exaggerated promises in an effort and hard work to sell far more of their solutions.

Aside from the crank hub scare, the S55 has no big concerns to report. Numerous of these engines are nevertheless likely potent a lot more than 8 many years from their original creation day.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 engine is an amazing power plant. It brought turbo abilities to the M collection when it 1st appeared in 2014 with the BMW M3 and BMW M4.

It’s an enhancement of the award-profitable N55 motor, and it functions twin turbochargers and a host of other upgrades.

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