A Complete Overview – UroTuning


With around 40 yrs of record, BMW’s M badge has very long represented the pinnacle of functionality in the buyer motorsport entire world. At any time since the first M1 debuted, these cars have dominated roads and race tracks all more than the environment.

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

Returning to their legendary inline-6 layout, the S55 signifies a transfer to downsize from the V-8s beneath the hood of the last era of M vehicles. 

How does the S55 stack up as opposed to preceding choices? Read through on to find out all about it.

Embracing Turbochargers

In the previous, the engines powering a lot of of BMW’s M cars ended up the natural way-aspirated. The M series has constantly managed a devoted subsequent of fanatics who consider wonderful pride in their cars and the engines that ability them.

So, when the manufacturer declared that a turbo would be coming to the M collection, enthusiasts have been a bit anxious, but a turbo-billed M car or truck signifies BMW embracing modern design features. It is really a shift toward more compact form factors, improved gas economy, and reduce emissions with the BMW efficiency sections you’ve got developed to rely on.

The S55 isn’t really BMW’s 1st I6 featuring to characteristic a turbocharger. That distinction belongs to the N55 motor that first appeared mated to the F07 5-series Gran Turismo.

The 3. L N55 went on to obtain numerous accolades. It appeared on Ward’s Leading Ten Engines list for 3 several years in a row and was voted 2014’s Engine of the 12 months in the 2.5-3. L category.

N55 and S55

Just after receiving these kinds of praise for their perform with turbochargers and observing the automotive landscape shift to lesser engines, it produced feeling to carry on the pattern.

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

On the other hand, the S55 packs a punch the N55 are unable to match. Compared with the N55’s one turbo with twin-electricity technologies, the S55 attributes two traditional turbochargers.

The variances really don’t halt there. The S55 also characteristics Valvetronic know-how to increase throttle reaction, lessen gasoline use, and reduce CO2 emissions. It is really an engine developed with an eye towards fashionable considerations.

Other improvements include things like much more superior intercoolers to chill the motor, twin gas pumps, stronger pistons, a substantial-overall performance light-weight crankshaft, and a shut-deck motor bay.

Apart from the turbos, the closed-deck structure is maybe the most significant improvement over the N55. It enables for improved ability output thanks to bigger cylinder force.

S55 General performance

Thanks to the twin-turbo configuration, the S55 has an exceptionally even torque output. Although this is true of most turbo-billed automobiles, the S55 lets you to tap into wheel-spinning torque from as low as 1850 RPM, and provides it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos technology is the reason that torque supply is so constant across the rev-band.

5500 RPM to 7300 RPM is the engine’s best overall performance band, with its top velocity reachable at 7600 RPM. This engine is able of furnishing both of those dependable torque software and an unbelievable rate of speed.

In its inventory configuration, the S55 engine makes 425 HP and 406 lb-ft of torque. Even though these numbers are unquestionably spectacular, it is really capable of so a lot additional with a handful of upgrades.

The S55 engine also retains the record for the most strong BMW engine at any time designed. BMW tuning introduced a heavily-modified variation up to 1,150 HP at the wheels.

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

To assure oil distribution even less than limited cornering, the S55 also offers a secondary oil pump. This pump pushes oil from the sides of the pan into the engine.

Wherever To Uncover the S55

The S55 is a very-able engine. It identified a home less than the hood of a quantity of creation styles and overall performance cars. 

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

A a little bit detuned version powers the F87 M2 CS Racing. Right here, it can make concerning 275 and 360 HP.

Other programs in the M2 involve the F87 M2 Opposition, where the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.

On high-efficiency M3s, the S55 can be identified powering the F80 M3 Competitors producing 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 performance purposes consist of the F82 and F83 M4 Competitors with 444 HP, the F83 M4 CS Racing with 453 HP, the F82 M4 GTS, and F83 M4 GTM Champion Edition. The latter two each aspect 493 HP many thanks to a water injection process.

Is the S55 Trustworthy?

As the many years pass by, the S55 continues to establish to be a fairly reliable engine. Like all BMW engines, it does at times practical experience difficulties like substantial-tension gas pump failure and carbon build-up, but individuals difficulties are relatively uncommon.

The only major situation that allegedly afflicted a couple of these engines was a spun crank hub. Mainly because it borrowed the crank hub design and style from the N54 and N55 engines, some claimed early editions of the N55 engine expert crank hub difficulties.

Having said that, BMW improved the layout of the crank hub in 2016, which appeared to place an finish to the situation. It turned out that TPG Tuning, an aftermarket elements company, had wildly exaggerated claims in an work to provide more of their goods.

Apart from the crank hub scare, the S55 has no main issues to report. Several of these engines are however likely potent a lot more than 8 several years from their initial generation date.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 engine is an amazing power plant. It brought turbo capabilities to the M sequence when it to start with appeared in 2014 with the BMW M3 and BMW M4.

It really is an improvement of the award-profitable N55 engine, and it capabilities twin turbochargers and a host of other upgrades.

Want to improve your BMW 3-sequence? UroTuning is your source for BMW parts. Search our collection of goods currently.


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By Kelli