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BMW HP4 track test, Racefoxx and alpha Racing BMW S 1000 RR

Bavarian burners in the track test

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The BMW S 1000 RR and HP4 set the tone for superbikes. As part of the PS-TunerGP, two tuned models from Racefoxx and alpha-Racing meet an HP4.

Racefox BMW S 1000 RR

The dominance of the BMW S 1000 RR and BMW HP4 among athletes is terrifying. But despite their superior performance, BMWs are not perfect motorcycles. After all, they have to manage the balancing act between road riders and racers, which is not really easy. Good for those who want a pure racing file. Because the tuner community has meanwhile created plenty of room for maneuver for the BMW siblings. Two interesting representatives of the scene found their way to the PS-TunerGP 2013 in Hockenheim and were allowed to show what they can do. Also included, a BMW HP4, as a series reference motorcycle, so to speak. How will this exciting test of strength end?

BMW HP4 track test, Racefoxx and alpha Racing BMW S 1000 RR

Bavarian burners in the track test

Racefoxx BMW S 1000 RR

The Racefoxx headquarters are in Remscheid and are managed by Steve Litschka and Christian Kuhnen. When setting up their TunerGP project based on the BMW S 1000 RR, the two agreed on the following parameters: a unique look, very good price / performance ratio and increased performance.

Point one in the specifications was completed successfully and clearly visible from afar. The Racefoxx BMW, called "Stealth Beemer", stands out from the crowd with its matt carbon look. Anyone who thinks that only a set of China plastic went to the BMW is very wrong. Because the carbon dress is a complete in-house development. Together with a designer, engineer Kuhnen designed the new line on a clay model, took up details of the BMW S 1000 RR and mixed them there with those of the stealth bomber Northrop B-2, which is almost invisible to radar the US Air Force.

The seat hump is very striking. Its V-shaped end takes up the shape of the plane. A small but mean detail can be found on the side panels. The polarizing gills of the BMW S 1000 RR can now be found on both sides of the vehicle. It never occurred to Kuhnen to leave them out completely, after all, it is precisely such features that make BMW unique.

The engineer provides background information on matt optics: carbon is attacked and decomposed by the UV rays of sunlight. To prevent this, "normal" carbon parts are coated with a clear varnish with a UV filter and therefore shine. Racefoxx protects its components with a painted UV filter, but uses a different painting method, which creates the matt look. Does this have to be bought at a high price? Litschka says no, because if several orders are placed for the “stealth kit”, the parts will be produced in series. At the moment the complete set is calculated at 1100 euros. With which point two in the specifications, the attractive price / performance ratio would be achieved. The third point remains, the increased performance.

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The information is promising

The chassis and engine of the stealth project were optimized by Andreas Reh from Rehcing. The fork’s stanchions have been DLC-coated and the innards have been redesigned. The shock absorb comes from Wilbers and is IDM-related. Brembo M4 100 calipers and OZ forged wheels replace the original parts, while a self-made exhaust pipe removes the exhaust gases via a Suzuki GSX-R 750 carbon muffler. Reh machined the cylinder head on the engine of the BMW S 1000 RR. Smoothed transitions where they had to be smoothed on the already precisely manufactured cylinder head, increased compression and adapted the mapping of the injection to the changed hardware. He used a so-called "Rexxer" with which the software in the original control unit can be accessed. On the incorruptible roller dynamometer, 209 hp are then applied to the crankshaft. Which is very promising in connection with the 192 kilograms of the equally incorruptible scales.

The moderately modified engine adds ten horsepower to the series engine. That makes sense on the race and, above all, fun.

Then the confirmation on the ring: Crisp, firm driving behavior paired with fat thrust instantly provide better feedback and faster lap times than on the standard BMW HP4. However, you have to plow more for this. Then the analysis in the box: The handlebars are swept too tightly, so the lever is too short and you have to use too much force when changing lean angles. Spreading the halves of the handlebars produces the desired result: The Racefoxx now turns as dynamically as the HP4 and doesn’t give it a luck when accelerating out of the corner. Despite the Brembo M 100 brake calipers, the thread of the front brake has remained. As on the BMW HP4, the brakes release after four sharp laps and then remain stable for the rest of the turn – that’s not entirely happy, but not dangerous. All in all, the Stealth Beemer based on the BMW S 1000 RR from Racefoxx is not only individual, but also fast.

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alpha Racing BMW S 1000 RR

22nd Pictures

Pictures: BMW HP4 track test, Racefoxx and alpha Racing BMW S 1000 RR

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The thoughts turn in circles. Sometimes lightning flashes through the cerebellum: Can I break my personal best lap time with this performance? Or do the cattle just rip my arms off? Or do they even bend like matches when braking at the hairpin? There is only one thing left: Find out, man!

Recalibration of the senses on the alpha-Racing BMW S 1000 RR

The clutch of the alpha Racing BMW S 1000 RR engages very early and hard. How are you supposed to get off to a reasonable start to the race? Anyway, this isn’t a race. I roll out of the box with a slightly higher idle speed. Less than 30 seconds later, I fly through the parabolic steroids for the first time, enjoy this animal thrust and bring the pads up to temperature with a conservative braking point. Second gear through the hairpin goes well, no wheelie tendency when pulling up. At least that’s what I thought – until the hammer comes in the upper speed quarter and cracks terribly. Thanks to the perfectly coordinated automatic gearshift, the gear changes slide precisely, and the quick right-hand bend is a frightening speed. Uff! Again hard braking and turning, followed by gentle opening of the throttle valves. And again the time-lapse sets in, the pulse rises. I use the entire first turn to adjust to the alpha Racing-S 1000 RR. Probe the feedback from the crisp chassis, save the effort required when turning the chair and the manual effort when braking. And then I need a little break. Despite my snail-like lap times of around 1.50 min, the alpha Racing-BMW needs a recalibration of the senses.

This takes place on time for the second test turn. The rhythm fits so slowly. With flying colors, but for the first time since the invention of the PS-TunerGP with only 95 percent open throttle valve, I am racing through the parabolic steroids in sixth gear. A slight agitation in the rear indicates that the Bitubo shock absorb is receiving real pressure and the tire is desperately looking for grip. The alpha racing rocket pulls and pulls. A curious look at the racing dashboard and my heart almost stops shortly before the braking point: 317 km / h stand there. Anchor! Anchor! Anchor! Brembo calipers and alpha racing discs come together, stand on their feet and bring the pilot and bike to a viable turning speed for the hairpin in no time. Wow, every lap with the same, unyielding performance – that really is a steadfast brake!

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alpha-Racing S 1000 RR costs between 50,000 and 60,000 euros

A stronger superbike has never been put to the test at PS. The alpha Racing-S 1000 RR presses 237 unbelievably good rideable horsepower onto the roller.

The second turn is followed by a third and with it the realization that it is not worth worrying about 237 hp on the clutch. On the contrary: just as alpha Racing has built the S 1000 RR, the weapon can even be driven in a relaxed and safe manner. You can keep the risk low at the entrance to the curve, because the next straight is bound to come.

It is simply impossible to list all the technical changes to the S 1000 RR here. Two things that the project manager Jens Hainbach promises are especially important and beautiful. First: Anyone can order such a motorcycle, such a chassis or such an engine from him, because alpha Racing can turn any S 1000 RR into such a surface-to-surface missile. Individual packages are put together depending on the budget, conversions that have already taken place or requests. However, if you want a complete package on par with the bike tested here based on a new S 1000 RR, you have to dig deep into your pockets. Between 50,000 and 60,000 euros go over the counter. Second: You don’t have to be afraid of 237 hp. You should just give yourself some time to get used to it and always have respect for the power – nothing more.

And how does a standard BMW HP4 feel compared to the alpha tier at the Superbike World Championship level? Kind of like a worn out sneaker compared to brand new sprint spikes.

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