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A Complete Overview – UroTuning

A Complete Overview – UroTuning


With over 40 several years of background, BMW’s M badge has very long represented the pinnacle of efficiency in the purchaser motorsport planet. Ever because the initial M1 debuted, these vehicles have dominated roadways and race tracks all in excess of the world.

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 famous inline-six style, the S55 represents a shift to downsize from the V-8s beneath the hood of the previous technology of M cars. 

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

Embracing Turbochargers

In the previous, the engines powering lots of of BMW’s M autos ended up obviously-aspirated. The M sequence has always taken care of a devoted subsequent of fanatics who get great satisfaction in their vehicles and the engines that energy them.

So, when the brand announced that a turbo would be coming to the M collection, fanatics were being a little bit anxious, but a turbo-charged M auto represents BMW embracing modern day design and style elements. It is a shift toward scaled-down sort elements, improved gasoline overall economy, and decreased emissions with the BMW performance components you’ve got grown to rely on.

The S55 is just not BMW’s initially I6 supplying to aspect a turbocharger. That difference belongs to the N55 motor that first appeared mated to the F07 5-series Gran Turismo.

The 3. L N55 went on to acquire several accolades. It appeared on Ward’s Top Ten Engines listing for 3 decades in a row and was voted 2014’s Engine of the 12 months in the 2.5-3. L group.

N55 and S55

After getting this sort of praise for their operate with turbochargers and looking at the automotive landscape shift to scaled-down engines, it manufactured sense to go on the development.

The S55 engine builds on the basis laid by the N55. They the two feature the identical 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.

Nonetheless, the S55 packs a punch the N55 are not able to match. Unlike the N55’s solitary turbo with twin-ability know-how, the S55 capabilities two vintage turbochargers.

The distinctions never end there. The S55 also capabilities Valvetronic technologies to enhance throttle response, minimize fuel usage, and reduced CO2 emissions. It’s an engine intended with an eye towards contemporary concerns.

Other advancements consist of additional superior intercoolers to chill the motor, twin gas pumps, stronger pistons, a higher-effectiveness light-weight crankshaft, and a closed-deck motor bay.

Aside from the turbos, the closed-deck design and style is probably the most important enhancement above the N55. It will allow for enhanced electric power output many thanks to greater cylinder tension.

S55 Functionality

Thanks to the twin-turbo configuration, the S55 has an incredibly even torque output. Even though this is legitimate of most turbo-charged vehicles, the S55 makes it possible for you to tap into wheel-spinning torque from as low as 1850 RPM, and delivers it linearly all the way to 5500 RPM.

BMW’s Valvetronic and Double-Vanos engineering is the motive that torque delivery is so constant across the rev-band.

5500 RPM to 7300 RPM is the engine’s best overall performance band, with its best pace reachable at 7600 RPM. This engine is able of giving each constant torque application and an amazing fee of velocity.

In its inventory configuration, the S55 motor tends to make 425 HP and 406 lb-ft of torque. Although these numbers are definitely amazing, it is really able of so substantially far more with a couple of upgrades.

The S55 motor also retains the file for the most impressive BMW motor at any time built. BMW tuning introduced a greatly-modified version up to 1,150 HP at the wheels.

This engine’s twin turbos just about every produce up to 18 lbs . of improve to the cylinders and arrive with an digital wastegate. Thanks to this style, the engine doesn’t want a blow-off valve.

To make sure 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.

Exactly where To Locate the S55

The S55 is a highly-able engine. It observed a house less than the hood of a selection of output designs and overall performance automobiles. 

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

A marginally detuned variation powers the F87 M2 CS Racing. Listed here, it can make amongst 275 and 360 HP.

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

On higher-overall performance M3s, the S55 can be found powering the F80 M3 Competitiveness producing 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 effectiveness apps include 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 Winner Edition. The latter two both aspect 493 HP thanks to a h2o injection system.

Is the S55 Dependable?

As the decades pass by, the S55 proceeds to establish to be a relatively trusted motor. Like all BMW engines, it does occasionally experience difficulties like high-force fuel pump failure and carbon construct-up, but individuals problems are relatively uncommon.

The only big issue that allegedly afflicted a few of these engines was a spun crank hub. Because it borrowed the crank hub style from the N54 and N55 engines, some claimed early editions of the N55 engine skilled crank hub challenges.

On the other hand, BMW enhanced the design and style of the crank hub in 2016, which seemed to put an end to the challenge. It turned out that TPG Tuning, an aftermarket parts maker, experienced wildly exaggerated statements in an energy to offer far more of their items.

Aside from the crank hub scare, the S55 has no major problems to report. Many of these engines are continue to heading potent more than 8 several years from their first generation date.

The S55 Powers the BMW M3 and BMW M4

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

It is really 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-series? UroTuning is your source for BMW pieces. Look through our collection of solutions these days.



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