A Complete Overview – UroTuning

With in excess of 40 years of historical past, BMW’s M badge has very long represented the pinnacle of functionality in the purchaser motorsport planet. At any time due to the fact the to start with M1 debuted, these cars and trucks have dominated roads and race tracks all about the earth.

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

Returning to their legendary inline-six design and style, the S55 signifies a transfer to downsize from the V-8s less than the hood of the last generation of M autos. 

How does the S55 stack up in comparison to earlier choices? Read through on to understand all about it.

Embracing Turbochargers

In the earlier, the engines powering lots of of BMW’s M cars were the natural way-aspirated. The M collection has always managed a devoted pursuing of fanatics who consider good delight in their cars and trucks and the engines that power them.

So, when the manufacturer declared that a turbo would be coming to the M sequence, fans had been a bit involved, but a turbo-billed M motor vehicle signifies BMW embracing modern day style and design aspects. It can be a shift toward more compact variety things, enhanced gas economic system, and reduce emissions with the BMW efficiency areas you have developed to trust.

The S55 isn’t BMW’s 1st I6 giving to attribute a turbocharger. That difference belongs to the N55 motor that very first appeared mated to the F07 5-sequence Gran Turismo.

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

N55 and S55

Right after getting such praise for their get the job done with turbochargers and looking at the automotive landscape change to lesser engines, it produced feeling to continue the development.

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

Even so, the S55 packs a punch the N55 can not match. In contrast to the N55’s solitary turbo with twin-ability engineering, the S55 functions two vintage turbochargers.

The differences never cease there. The S55 also functions Valvetronic technologies to make improvements to throttle reaction, lessen fuel use, and decreased CO2 emissions. It is an motor designed with an eye toward contemporary issues.

Other improvements consist of much more state-of-the-art intercoolers to chill the motor, twin gas pumps, more powerful pistons, a higher-performance light-weight crankshaft, and a closed-deck motor bay.

Aside from the turbos, the closed-deck design is maybe the biggest advancement over the N55. It allows for enhanced ability output many thanks to increased cylinder strain.

S55 Effectiveness

Many thanks to the twin-turbo configuration, the S55 has an very even torque output. While this is legitimate of most turbo-billed cars and trucks, the S55 allows you to tap into wheel-spinning torque from as reduced as 1850 RPM, and provides 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 steady throughout the rev-band.

5500 RPM to 7300 RPM is the engine’s ideal performance band, with its major speed reachable at 7600 RPM. This motor is able of delivering both steady torque software and an remarkable level of pace.

In its stock configuration, the S55 motor can make 425 HP and 406 lb-ft of torque. Even though these quantities are surely impressive, it can be capable of so significantly far more with a couple of upgrades.

The S55 engine also holds the document for the most impressive BMW engine ever built. BMW tuning introduced a seriously-modified version up to 1,150 HP at the wheels.

This engine’s twin turbos each deliver up to 18 pounds of strengthen to the cylinders and arrive with an digital wastegate. Thanks to this design, the motor will not have to have a blow-off valve.

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

The place To Come across the S55

The S55 is a really-able engine. It discovered a home under the hood of a amount of generation designs and efficiency cars and trucks. 

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

A a little detuned variation powers the F87 M2 CS Racing. In this article, it will make between 275 and 360 HP.

Other applications in the M2 include things like the F87 M2 Competitors, in which the motor produces 405 HP, and the F87 M2 CS racing with 444 HP.

On significant-effectiveness M3s, the S55 can be discovered powering the F80 M3 Levels of competition making 444 HP and the F80 M3 CS Racing with 453 HP.

Its M4 efficiency apps consist of 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 each aspect 493 HP thanks to a water injection method.

Is the S55 Reliable?

As the many years pass by, the S55 proceeds to verify to be a fairly dependable motor. Like all BMW engines, it does once in a while experience issues like significant-pressure fuel pump failure and carbon make-up, but those troubles are comparatively exceptional.

The only significant difficulty that allegedly influenced a number of of these engines was a spun crank hub. For the reason that it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 motor expert crank hub problems.

Having said that, BMW improved the design and style of the crank hub in 2016, which appeared to place an conclude to the issue. It turned out that TPG Tuning, an aftermarket sections company, had wildly exaggerated promises in an work to offer a lot more of their solutions.

Apart from the crank hub scare, the S55 has no main concerns to report. Numerous of these engines are nonetheless heading strong a lot more than 8 several years from their first manufacturing day.

The S55 Powers the BMW M3 and BMW M4

BMW’s S55 motor is an unbelievable power plant. It introduced turbo capabilities to the M series when it to start with appeared in 2014 with the BMW M3 and BMW M4.

It’s an improvement of the award-successful N55 motor, and it characteristics twin turbochargers and a host of other updates.

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