With above 40 yrs of heritage, BMW’s M badge has extended represented the pinnacle of overall performance in the customer motorsport planet. Ever since the initially M1 debuted, these automobiles have dominated roads and race tracks all about the planet.
Debuting underneath the hood of the BMW M3 and BMW M4 in 2014, the S55 motor is next in line from this prestigious motorsport team.
Returning to their famous inline-six style, the S55 represents a transfer to downsize from the V-8s less than the hood of the final generation of M cars.
How does the S55 stack up when compared to previous choices? Read through on to discover all about it.
In the previous, the engines powering quite a few of BMW’s M automobiles had been the natural way-aspirated. The M series has always managed a devoted subsequent of lovers who choose good pride in their automobiles and the engines that electric power them.
So, when the model announced that a turbo would be coming to the M collection, lovers were a little bit concerned, but a turbo-billed M auto signifies BMW embracing contemporary layout features. It is really a change toward smaller variety factors, improved gas economy, and decrease emissions with the BMW functionality elements you’ve got grown to trust.
The S55 is not BMW’s 1st I6 supplying to element a turbocharger. That difference belongs to the N55 engine that initially appeared mated to the F07 5-series Gran Turismo.
The 3. L N55 went on to obtain numerous accolades. It appeared on Ward’s Major 10 Engines listing for three several years in a row and was voted 2014’s Motor of the Calendar year in the 2.5-3. L class.
N55 and S55
Right after obtaining these praise for their function with turbochargers and viewing the automotive landscape change to more compact engines, it created sense to go on the trend.
The S55 motor builds on the foundation laid by the N55. They each element the very same 84 mm bore, 86.9 mm stroke, and 2,729 cc displacement.
Nonetheless, the S55 packs a punch the N55 can not match. Not like the N55’s solitary turbo with twin-electricity technologies, the S55 features two common turbochargers.
The differences really don’t end there. The S55 also options Valvetronic engineering to strengthen throttle response, reduce fuel usage, and lessen CO2 emissions. It is really an motor designed with an eye toward modern-day fears.
Other advancements include things like extra innovative intercoolers to chill the engine, twin gasoline pumps, much better pistons, a higher-functionality lightweight crankshaft, and a shut-deck engine bay.
Aside from the turbos, the closed-deck layout is perhaps the major advancement above the N55. It allows for improved electric power output many thanks to bigger cylinder pressure.
S55 Overall performance
Many thanks to the twin-turbo configuration, the S55 has an extremely even torque output. Whilst this is correct of most turbo-billed automobiles, the S55 allows you to tap into wheel-spinning torque from as small as 1850 RPM, and provides it linearly all the way to 5500 RPM.
BMW’s Valvetronic and Double-Vanos engineering is the motive that torque supply is so reliable throughout the rev-band.
5500 RPM to 7300 RPM is the engine’s optimal effectiveness band, with its best velocity reachable at 7600 RPM. This engine is capable of supplying each dependable torque software and an amazing price of pace.
In its stock configuration, the S55 engine will make 425 HP and 406 lb-ft of torque. Whilst these quantities are absolutely amazing, it truly is able of so substantially more with a several upgrades.
The S55 engine also retains the history for the most effective BMW engine at any time manufactured. BMW tuning introduced a seriously-modified model up to 1,150 HP at the wheels.
This engine’s twin turbos each individual develop up to 18 lbs of enhance to the cylinders and appear with an digital wastegate. Many thanks to this design, the motor isn’t going to will need a blow-off valve.
To make certain oil distribution even beneath restricted cornering, the S55 also offers a secondary oil pump. This pump pushes oil from the sides of the pan into the motor.
Where by To Uncover the S55
The S55 is a extremely-able motor. It discovered a home beneath the hood of a variety of production types and efficiency automobiles.
In its stock type, it powers the F80 M3, the F82 M4, and the F83 M4.
A a little bit detuned variation powers the F87 M2 CS Racing. Listed here, it helps make between 275 and 360 HP.
Other applications in the M2 incorporate the F87 M2 Competitors, where by the engine produces 405 HP, and the F87 M2 CS racing with 444 HP.
On large-performance M3s, the S55 can be located powering the F80 M3 Levels of competition producing 444 HP and the F80 M3 CS Racing with 453 HP.
Its M4 efficiency purposes involve 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 Winner Edition. The latter two both equally element 493 HP many thanks to a water injection system.
Is the S55 Trusted?
As the decades go by, the S55 carries on to confirm to be a reasonably trusted engine. Like all BMW engines, it does at times practical experience difficulties like higher-pressure fuel pump failure and carbon construct-up, but those problems are rather scarce.
The only main difficulty that allegedly influenced a handful of of these engines was a spun crank hub. Since it borrowed the crank hub layout from the N54 and N55 engines, some claimed early editions of the N55 motor skilled crank hub problems.
On the other hand, BMW enhanced the layout of the crank hub in 2016, which seemed to set an finish to the situation. It turned out that TPG Tuning, an aftermarket sections manufacturer, had wildly exaggerated statements in an effort and hard work to market much more of their products.
Aside from the crank hub scare, the S55 has no important concerns to report. Lots of of these engines are continue to likely solid far more than 8 many years from their original creation day.
The S55 Powers the BMW M3 and BMW M4
BMW’s S55 motor is an remarkable electric power plant. It introduced turbo abilities to the M collection when it very first appeared in 2014 with the BMW M3 and BMW M4.
It can be an enhancement of the award-successful N55 engine, and it capabilities twin turbochargers and a host of other upgrades.
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