August 1, 2012
With the BMW HP4, BMW Motorrad presents the lightest 4-cylinder supersports bike in the 1000cc class to date. Based on the BMW S 1000 RR the new sports motorcycle has an output of 142 kW (193 hp) and weighs 199 kilos including Race ABS and with a 90% full fuel tank (169 kg dry weight with Race ABS).
The new BMW HP4 sees its world premiere in 2012 and is a continuation of BMW Motorrad’s HP model series founded in 2005. After the boxer models HP2 Enduro, HP2 Megamoto and HP2 Sport, the BMW HP4 is the first 4-cylinder motorcycle in the HP family.
Due to its extensive range of fittings and excellent set-up, the new HP4 shall be immediately ready for use on the race track ex works, requiring no elaborate modifications. But at the same time it offers great potential for dynamic riding on country roads.
The standard passenger seat cover ensures the monoposto look so characteristic of the race track. But for riders who would like to travel with a passenger, BMW Motorrad also offers a passenger package as an ex works option. In addition to the passenger seat this includes the passenger footrest system.
The new BMW HP4 (click images to enlarge).
Dynamic Damping Control DDC
The HP4 is fitted as standard with Dynamic Damping Control DDC. This system allows dynamic damping adaptation of the upside-down fork and spring strut to the specific situation on the road. The damping is adapted to the current manoeuvre or road surface by means of sensor-supplied parameters via electrically controlled regulation valves. In this way, the HP4 shall offer optimum damping in every situation, handling long and short shocks virtually perfectly so as to provide maximum traction and safety.
In keeping with the HP4 use profile of race track and dynamic country road riding, the new bike not only has Brembo monoblock brake calipers and 9x floating brake discs at the front but also a further developed and refined Race ABS.
As before, this ABS has four different modes for wet surfaces (“Rain”), roads (“Sport”), race track with supersports tyres (“Race”) and race track with slicks (“Slick”). Racing experience gained from the IDM (International German Motorcycle Championship) has been fed directly into the Race ABS fitted in the HP4. In “Slick” mode, the so-called IDM setting with refined regulation impulses now gives the skilled rider the option of maximum possible deceleration.
Dynamic Traction Control in “Slick” mode
The HP4 uses a rear tyre in the new format 200/55 ZR 17. The Dynamic Traction Control DTC already used in the RR has been optimized for supersports use in the HP4: now the effect of traction control can be adapted in “Slick” mode to changing conditions and the rider’s individual preference while on the move.
Launch Control and shift assistant
The HP4 is the first BMW motorcycle to have a so-called Launch Control function which provides active support for the rider in “Slick” mode to achieve maximum acceleration from standing – for example on race starts. Launch Control limits engine torque so as to provide the maximum torque transferable from the rear wheel whenever the front wheel is under no throttle. This means the rider has to focus less on the throttle because he is controlling acceleration solely using the clutch. In addition, when Launch Control is activated engine torque is reduced as soon as the system detects front wheel lift. This prevents unwanted wheelies when accelerating.
The HP4 allows the rider to make instant gearshifts with virtually no interruption of tractive force by means of the shift assistant, fitted as standard. This helps gain valuable fractions of a second on the race track, too.
New finely wrought 7-spoke wheels in forged light alloy and a new, lighter sprocket carrier give the HP4 a weight reduction of 2.4 kg as compared to the RR.
The exhaust system is made entirely of titanium and saves as much as 4.5 kilograms as compared to the RR, thereby contributing to the HP4′s enhanced handling qualities. The new exhaust system has an interference pipe between cylinders two and three, a controlled acoustic valve and a closed-loop catalytic converter. It has been possible to optimise the torque curve thanks to the new exhaust system, with the engine application adapted accordingly.
Sharpened engine set-up and more torque in the mid-range.
The new HP4 is fitted with the water-cooled 4-cylinder in-line engine of the S 1000 RR with a peak output of 142 kW (193 hp) at 13,000 rpm and a maximum engine speed of 14,200 rpm. As in the RR, its maximum torque of 112 Nm goes on stream at 9,750 rpm. The torque has been perceptibly increased in the 6,000 rpm to 9,750 rpm range. In “Rain” mode there is now a smoother output and torque curve available between 2,500 rpm and 8,000 rpm.
Unlike the RR, the 4-cylinder in-line engine in the HP4 provides the full output of 142 kW (193 bhp) at 13,000 rpm in all modes – “Rain”, “Sport”, “Race” and “Slick” – with an identical throttle curve and thus the same response.
Supersports fittings for sporty riders.
The HP4 has numerous special features to meet the needs of sports and racing riders. For example, the instrument cluster not only has a newly designed dial face but also provides an extended range of information and functions. The information display now shows the DDC set-up menus as well as the figures for DTC fine adjustment and Launch Control activation.
HP4 with Competition Package
The HP4 with Competition Package is an especially exclusive version of the motorcycle. It comprises refined carbon parts including a long, closed HP engine spoiler in carbon, an adjustable HP rider footrest system, folding HP brake and clutch levers, wheels finished in Racing blue metallic and a sponsor sticker kit.
Filed under: MCR News