Product test: accessory silencer for BMW S 1000 RR

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Product test: accessory silencer for BMW S 1000 RR
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Exhaust & silencer

Product test: accessory silencer for BMW S 1000 RR

Product test: exhaust systems for BMW S 1000 RR
What do accessory silencers bring?

Even in the series dress, the S 1000 RR outclassed the competition with 201 measured horsepower. Can be added a shovel with an accessory silencer? Ten systems being tested.

Jorg Lohse

04/28/2011

Are the fat years over? Just a few years ago, when it came to exhaust tests, it was no problem to put together a large number of top-class test fields. If you ask the manufacturers about systems for current test machines today, you hear more and more often: “I’m sorry, nothing in the program!” Behind the scenes, there is verbal drawing: You don’t even have the slightest chance of putting an exhaust that works in accordance with applicable noise regulations on the market. The counter-question why other providers make it is usually only answered with a resigned shrug of the shoulders, sometimes with poisonous comments: “One seems to have a particularly good connection to the test center!” In fact, without the elaborate flap systems that motorcycle manufacturers install in the exhaust tract, the driving noise, which is legally limited to 80 dB (A), can hardly be complied with. This form of sound insulation reveals the farce of current noise regulations all the more. To understand this, you have to look closely at the circumstances of the driving noise measurement: To determine the decibel A value, the motorcycle rolls into the test zone in second and third gear at 50 km / h and is accelerated over a distance of 20 meters , in the end the gas closed abruptly. In the age of modern engine management, it shouldn’t be a problem to calibrate the motorcycle’s control unit accordingly for this measuring field. Usually supported by a valve that kills harmful sound waves in the exhaust tract. In addition, there are no measuring fields, and so the motto outside the legally relevant area is: flap on draft, flood sewer, chapel!

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Product test: accessory silencer for BMW S 1000 RR

Product test: exhaust systems for BMW S 1000 RR
What do accessory silencers bring?

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As a rule, very few accessory silencers have a similar flap control. With the result that the driving noise is mostly above the legal limit. Here is an example from the last one MOTORCYCLE exhaust test with a Kawasaki Z 750: With the exception of the series pot, no exhaust was able to meet the limit of 80 dB (A) despite having an operating permit (EG-BE).

On the other hand, things are much easier with motorcycles like the BMW S 1000 RR here in this test; because the actual music plays in the fat bread box, which is placed centrally under the superbike. This is where the catalytic converter and flap control as well as reflection chambers for noise reduction are housed. This underfloor front silencer is neither touched nor impaired in its function by adding an accessory muffler.

Real mufflers are therefore hardly necessary, the tailpipe attached to the outlet of the front muffler has more of an ornamental format like on a car, rather than fulfilling a real function. Meanwhile, the music is playing elsewhere. At the same time, this means that a replacement system can hardly separate itself from the specifications of the series machine. And so in this exhaust test a situation actually arises that has never existed before: no manufacturer manages to top the series performance of the BMW. Almost all the curves of the accessory systems are almost congruent with the series. The silencer from the Dutch manufacturer is still the tightest BOS on the heels of the original from BMW. At the bottom of the test bench run is the replacement tube from Bodis – in total, six horsepower and four Newton meters are missing from the maximum values ​​of the S 1000 RR. Nevertheless, it should be noted that this curve discussion is of a purely theoretical nature and can result in a lost lap at the regulars’ table than on the home route; because with a maximum of three percent deviation, you are still within the measurement tolerance. There remains the popular topic of weight optimization through accessory silencers. Here, too, there is little to nothing to be gained. The original end piece of the BMW weighs a mere 1300 grams, only Akrapovic, Arrow and Bodis undercut this value. Everyone else saddles on it, sometimes up to 50 percent. So the bottom line is that only individual preferences speak in favor of repotting: better sound, nicer shape. If you expect more, you have to invest significantly more and use a complete system for the Bavarian superbike. Incidentally, this tuning measure needs to be carefully prepared. The conversion itself is not for casual and hobby screwdrivers. Professionals with good tool equipment calculate three hours or more to dismantle the original and install the new cane.

Is it worth the effort? A look at the test bench curves of the street-legal systems from Akrapovic and SR Racing is thought-provoking. Both exhaust systems manage to remove the dent in the torque curve of the original version between 5000 and 7500 rpm. But they cannot achieve a real wow factor either. Maybe the fat years are really over. Which doesn’t really bother with 201 HP ex works.

Akrapovic slip on


Product test: accessory silencer for BMW S 1000 RR


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Akrapovic slip on.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Akrapovic Slip On.

providers  Jamparts, phone 07150/970565, www.akrapovic.de
coat  titanium
price  741.37 euros
Weight  1.0 kg
catalyst  unavailable*
Country of Manufacture  Slovenia
ECE approval mark  1 (Germany)
variants  no Conclusion Short tail pipe made of titanium with carbon cap including clean welded holder in top finish. Rich sound, performance but below standard. MOTORRAD verdict  Good
placement  2nd place

* Original cat is retained

Arrow Indy Race


Product test: accessory silencer for BMW S 1000 RR


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Arrow Indy Race.


Product test: accessory silencer for BMW S 1000 RR


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Performance graph with Arrow Indy Race.

providers  Alpha Technik, phone 08036/300720, www.alphatechnik.de
coat  titanium
price  499/429 euros (RRP / offer)
Weight  1.1 kg
catalyst  unavailable*
Country of Manufacture  Italy
ECE approval mark  13 (Luxembourg)
variants  Works model from 499 euros
Conclusion Deductions in appearance due to stained surface finish and sometimes unsightly welds. Slightly tense when growing. Performance under series.
MOTORRAD verdict  Satisfying
placement  6th place

* Original cat is retained

Bodis GP1-R


Product test: accessory silencer for BMW S 1000 RR


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Bodis GP1-R.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Bodis GP1 R.

providers  Speer Racing, phone 07121/959395, www.bodis-exhaust.net
coat  titanium
price  549 euros
Weight  0.8 kg
catalyst  unavailable*
Country of Manufacture  Hungary
ECE approval mark  1 (Germany)
variants  Stainless steel black 449 euros
Conclusion Unbalanced finish with stained surfaces and clumsily shaped sheet metal bracket. Imprecise fit, but rich, dull sound.
MOTORRAD verdict  Satisfying
placement  7th place

* Original cat is retained

Bos superbike


Product test: accessory silencer for BMW S 1000 RR


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BOS superbike.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with BOS Superbike.

providers  BOS exhaust, phone 05941/4793, www.bos-exhausts.de
coat  stainless steel
price  399 euros
Weight  1.4 kg
catalyst  unavailable*
Country of Manufacture  Netherlands
ECE approval mark  4 (Netherlands)
variants  Stainless steel black 449 euros
Conclusion Except for a few carelessly placed weld points on the holder, it is quite convincing. The best replacement damper on the test bench.
MOTORRAD verdict  Good
placement  1st place

* Original cat is retained

Laser X-Treme


Product test: accessory silencer for BMW S 1000 RR


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Laser X-Treme.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Laser Xtreme.

providers Wunderlich, phone 02642/97980, www.wunderlich.de and Hostettler, phone 07631/18040, www.ixs.com
coat  stainless steel
price  439 euros
Weight  1.7 kg
catalyst  unavailable*
Country of Manufacture  Netherlands
ECE approval mark  13 (Luxembourg)
variants  no
Conclusion Lots of parts plus fiddly attachment. In addition, sharp-edged processing residues are annoying. The robust sound fits, performance under series.
MOTORRAD verdict  Satisfying
placement  4th Place

* Original cat is retained

Leovince GP Pro


Product test: accessory silencer for BMW S 1000 RR


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Leovince GP Pro.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Leovince GP Pro.

providers  MCA Service, phone 05139/894906, www.leovince.de
coat  stainless steel
price  579 euros
Weight  1.9 kg
catalyst  unavailable*
Country of Manufacture  Italy
ECE approval mark  9 (Spain)
variants  no
Conclusion Formally cleverly designed, but the bottom line is that the workmanship is too careless. Significantly heavier than the original, performance below series.
MOTORRAD verdict  Satisfying
placement  5th place

* Original cat is retained

Sebring Phantom


Product test: accessory silencer for BMW S 1000 RR


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Sebring Phantom.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Sebring Phantom.

providers  Mizu, phone 07731/90670, www.sebring.de
coat  stainless steel
price  438 euros
Weight  1.5 kg
catalyst  unavailable*
Country of Manufacture  Austria
ECE approval mark  4 (Netherlands)
variants  Titan 538 euros
Conclusion Well processed, but in terms of sound, the pot remains restrained despite its trumpet shape. Performance remains under the series template.
MOTORRAD verdict  Good
placement  3rd place

* Original cat is retained

Complete system: BMW original


Product test: accessory silencer for BMW S 1000 RR


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BMW S 1000 RR original exhaust.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with original exhaust.

providers  BMW Motorrad, phone 0180/5001972, www.bmw-motorrad.de
coat  stainless steel
price  2,713.91 euros
Weight  10.7 kg
catalyst  available
Country of Manufacture  Poland
ECE approval mark  unavailable
variants  no
Conclusion The original cannot be topped. The 201 horses on the test stand do not allow the chasing field any cuts. The only disadvantage – the high weight.
MOTORRAD verdict  Very well
placement  1st place

Complete system: Akrapovic Evolution


Product test: accessory silencer for BMW S 1000 RR


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Akrapovic evolution.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with Akrapovic Evolution.

providers  Jamparts, phone 07150/970565, www.akrapovic.de
coat  titanium
price  2600.15 euros
Weight  5.1 kg
catalyst  available
Country of Manufacture  Slovenia
ECE approval mark  24 (Ireland)
variants  Carbon coat 2600.15 euros
Conclusion Carbon jacket 2600.15 euros The complete package from Igor Akrapovic is not for hobby screwdrivers. In return, a top finish, top sound and a small plus in torque.
MOTORRAD verdict  Good
placement  2nd place

Complete system: SR-Racing ABE


Product test: accessory silencer for BMW S 1000 RR


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SR-Racing complete system ABE.


Product test: accessory silencer for BMW S 1000 RR


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Performance diagram with SR-Racing complete system ABE.

providers  SR-Racing, phone 08252/905540, www.sr-racing.de
coat  titanium
price  1259 euros
Weight  7.0 kg
catalyst  available
Country of Manufacture  Germany
ECE approval mark  4 (Netherlands)
variants  Stainless steel 1159 euros
Conclusion Complete solution from Sepp Bruckschlogl’s exhaust manufacture in old-school design. His credo is to give the RR more torque.
MOTORRAD verdict  Good
placement  2nd place

5 facts about the exhaust


Product test: accessory silencer for BMW S 1000 RR


Lohse

An exhaust catalytic converter.

Perfomance:
Today, miracles can no longer be expected in modern motorcycles through tuning with accessory silencers. With a 1200 Suzuki Bandit, up to 20 percent more power was ideally achieved through simple repotting, but in the age of modern engine control and restrictive noise limits, most accessory systems usually stick to series output.

Labelling:
Operation on public roads permitted, a cat available? If there are checks on motorcycles, the race management takes a particularly close look at the exhaust systems. Especially if a silencer from the accessories adorns the rear instead of the original. In order for the inspection to go smoothly, the following markings should be present: framed E number (stands for the test country, e.g. 1 for Germany), followed by the four-digit type number (which enables clear allocation) and a circled one 5 or 9, which informs about the installation position of the catalytic converter.

Catalyst:
Exhaust gas cleaning yes or no? It goes without saying that anyone who drives a motorcycle approved after 2006 cannot do without the catalytic converter when converting the exhaust system. Even if these bikes without a catalytic converter passed the emissions test (AUK) required by the general inspection; because Euro 3 vehicles have to pass an extensive test cycle that has nothing to do with the AUK test.

dB killer:
Legal, illegal, sh … it doesn’t matter. Of course, almost every exhaust manufacturer allows the system to be adapted even further to one’s own needs via a relatively uncomplicated intervention – i.e. removal of the so-called dB killer. But if you do a check you have extremely bad cards. Relatively unlikely that the regulatory authority with a warning because of “improper noise behavior” and is satisfied with 20 euros. Rather, you have to reckon with the fact that driving without an operating permit will lead to an expensive procedure.

Holder:
The wheat is separated from the chaff on the suspension. In the low-cost segment, universal clamps are usually used, which can usually only be screwed under tension with a rubber sleeve that is easy to handle. In continuous operation, there is a risk of stress cracks due to material-killing vibrations. Ideally, the brackets are firmly screwed or neatly welded and allow the system to be attached without tension.


Product test: accessory silencer for BMW S 1000 RR


Lohse

Thomas Caasmann from the Society for Technical Monitoring (GTu) on replacing the exhaust on a motorcycle.

? In order to comply with the noise limit values, motorcycle manufacturers have to install complex flap systems in the exhaust tract. Accessory silencers should do without. Can that work at all??
! It is not true that motorcycle manufacturers have to install complex valve systems in the exhaust. You want it! According to EC law, the test sequence is a very precisely definable driving condition of the motorcycle in terms of speed range, gear and throttle valve position. Only this area is relevant. Measurements are only carried out in this narrow area. There is no measurement in front of and behind this area.

? What are the consequences of motorcyclists who are caught with a system that is too loud when measuring stationary noise at the roadside? Only the driving noise value is legally relevant.
! There is actually a legal basis for stationary noise and its measurement that is relevant. This is regulated in the so-called guideline for checking the stationary noise of motorcycles. This guideline is applied as soon as a traffic stop occurs “Discrepancies in subjective noise assessment” to be established. If the registered stationary noise, including a five dB tolerance, is exceeded during the measurement, according to the catalog of fines, 20 to 30 euros for a defective silencer system or ten euros for a refusal to have the sound level determined are due.

? Constant topic of Kat: Some exhaust manufacturers refer to an existing gray area in the approval of their systems. Can a motorcycle originally fitted with a cat actually be equipped with a catless accessory exhaust?
! It depends on. Above all, it depends on the emission class of the motorcycle. In March 2006, when the AUK was introduced, the Federal Ministry of Transport stipulated that up to emission code number 11 or 0211 in the vehicle documents, a silencer with a built-in catalytic converter can be exchanged for a replacement silencer without a catalytic converter. After removing the silencer with a catalytic converter against one without a catalytic converter, the limit value when examining the exhaust gases is 4.5% by volume of CO.

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