Exhaust test Yamaha FZS 1000 Fazer

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Exhaust test Yamaha FZS 1000 Fazer
Jahn

accesories

Exhaust & silencer

Exhaust test Yamaha FZS 1000 Fazer

Exhaust test Yamaha FZS 1000 Fazer
Sound appeal

17 Accessory silencers for the Yamaha FZS 1000 Fazer tested, compared and rated MOTORRAD in issue 14/2002.

Uli Holzwarth

06/25/2002

Part 1

Appointment Friday, 9 a.m., on the former parade ground of the also former Bundeswehr barracks near Grobengstingen on the Swabian Alb. MOTORRAD service editor Uli Holzwarth, temporary test driver Jorg Reichert and MOTORRAD online editor Andreas Schulz have competed.

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Sound appeal

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17 Accessory silencers for the Yamaha FZS 1000 Fazer Holzwarth had recruited from the relevant range of accessories, which, like the Yamaha original muffler, should be put to the test in terms of noise development. “The Fazer inherently has a very low driving noise value of 77 db (A)”, explains Holzwarth, “which must not be exceeded by the retrofit dampers. That is a real challenge for the developers.”

The former military site, which has been converted into an ADAC traffic training area, is ideal for checking how well this task has been solved – an asphalted area measuring around 250 x 200 meters, delimited by trees. Sound-reflecting structures or surfaces that could falsify a measurement are only available at a safe distance.

While Uli Holzwarth finds optimal conditions for himself and his sound pressure level measuring device to determine the driving and standing noise of the 18 exhaust silencers, onliner Schulz has to contend with slight problems. Because for MOTORRAD online the sound of the individual silencers is to be recorded by digital recording.

Unfortunately, sudden gusts of wind get caught in the stereo microphone, which can be heard as dull rumbling noises. If there is just no wind, a lawnmower interferes from a distance – or the lively birdsong from the shrubbery around the open-air measuring laboratory.

Sound samples of the accessory exhausts

To record the driving noise, MOTORRAD online simply attached itself to the sound pressure level measurement and recorded a trip through the measuring section in second gear from left to right, i.e. with the exhaust silencer on the side facing the recording microphone. The test runs are carried out according to the specifications for the homologation of accessory exhaust systems. To determine the stationary noise, the engine is kept at half the nominal speed for some time according to these guidelines, in the case of the Yamaha Fazer 5000 rpm.

However, this method is of little use for a sound impression. Test driver Reichert was therefore given the following procedure: start the engine, then quickly rev it up to 5000 rpm three times and let the engine fall back to idle speed, then hold it at 5000 rpm for three seconds and finally switch off the ignition. Sounds easy, but it wasn’t that easy to realize, as the different audio samples show.

Of course, all mufflers also had to endure a performance measurement. The results of this test including the performance curve, notes on special features and a test result for each silencer can be found in MOTORRAD 14/2002.

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