All Tests – BMW S 1000 RR Test: the surprise Kolossale! – The technical point

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BMW S 1000 RR test: the surprise Kolossale !

All Tests - BMW S 1000 RR Test: the surprise Kolossale! - The technical point

Investing in the Hypersport segment by taking inspiration from the Japanese seemed a technically judicious but little daring choice on the part of BMW. Except that with its raging engine and on-board electronics, the S 1000 RR strangles received ideas… Test !

The technical point

The 999 cc inline 4-cylinder weighing just 59.8 kg enables the S 1000 RR to develop 193 hp at 13,000 rpm and 112 Nm of torque at 9,750 rpm. With a bore / stroke ratio of 0.621 (80 * 49.7 mm), this block compressed to 13: 1 addresses the most "supersquare" dimensions of 4-cylinder hypersports set at 180 °. Modern, it uses lightweight titanium valves actuated by two hardened steel overhead camshafts, controlled by F1-inspired latches..

Taking a classic 4-in-2-in-1 scheme, the exhaust line weighs only 10.7 kg and uses two electronically managed flaps which regulate the connection between the manifolds. This technique makes it possible to tune the gas flows and increase the filling of the cylinders, and therefore improve performance..

These are transmitted from the crankshaft to a wet, anti-dribble, ten-disc 132.4mm clutch via a spur gear primary transmission. Witness to the attention BMW paid to weight (183 kg dry and 206.5 kg with Race ABS), the clutch is operated by cable and its cover is made of magnesium. Equipped with sequential injection (gasoline is injected into the intake duct of each cylinder individually), the S 1000 RR receives variable length intake tubes connected to a 7.9-liter airbox : depending on the engine speed, the length of the intake pipes varies electronically over two stages.

The opening of the throttle butterflies (48 mm in diameter) is ensured by an electronic system commonly called ride-by-wire: the cable of the throttle grip transmits the request expressed by the pilot to a sensor which converts it into a torque. corresponding and manages the butterfly accordingly. Careful, BMW has completed its system with a mechanical connection of the cable to the electronic actuator, which allows the pilot to close the throttle in all circumstances.

Very sophisticated, the S 1000 RR also embeds four selectable injection maps on the handlebars: Rain (rain) where the maximum power is delivered smoothly and restricted to 150 hp. The DTC (Dynamic Traction Control, electronic traction control, also responsible for regulating the wheelings by using the toothed wheels of the ABS to detect a difference in speed of rotation between the front and the rear) only intervenes. from a lateral inclination of 38 °.

In Sport and Race modes, the motorcycle delivers its maximum power and torque. The engine response to acceleration is more direct, the DTC only intervening on the ignition and butterflies from 45 ° (Sport) or 48 ° (Race).

Finally, Slick mode is reserved for use on the track, with, as the name suggests, racing tires. Just like the Race mode, it delivers all the power of the engine which reacts with maximum spontaneity. On the other hand, the Race ABS does not intervene any more on the rear wheel (approximately 5% of pressure is sent to the rear by actuating the front brake in the other modes) and the DTC authorizes a detachment of the front wheel for five seconds when the inclination does not exceed 20 °, in order to allow the best possible acceleration when exiting a curve.

Slick mode requires activation in the form of a coding card located under the saddle, which will be sold as an option in France ("around 50 euros", considers BMW), on condition of presenting a circuit license and a liability waiver when purchasing !

Side cycle, the S 1000 RR adopts a classic aluminum perimeter frame comprising four molded elements. The wheelbase (1,432mm) and caster (95.9mm) values, combined with the long 593mm swingarm (with adjustable pivot height) reveal a quest for agility and traction. The central mono-shock absorber is fully adjustable and even allows high and low speed compression adjustment.

Generous (46 mm), the inverted fork also offers a multitude of adjustments, including a possibility of varying the overhang of the sleeves of the order of 15 mm. Practical, these quality suspensions inaugurate a scale of settings with only ten positions, the effects of which are really noticeable when driving.

Finally, the S 1000 RR is fitted with Brembo four-piston radially-mounted calipers clamping discs 320 mm in diameter and 5 mm thick at the front and a rear single disc of 220 mm. Braking is managed by Race ABS (only 2.5 kg in total), the sensitivity of which varies depending on the mode engaged.

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