Exhaust test Kawasaki Z 750

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Exhaust test Kawasaki Z 750
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Exhaust & silencer

Exhaust test Kawasaki Z 750

Exhaust test Kawasaki Z 750
Listening games

Does the Kawasaki Z 750 sound better or just different with accessory silencers? And what about power and volume? MOTORRAD compared 15 retrofit pots with the original.

Uli Holzwarth

10/12/2005

For Sepp Bruckschlogl, head of the small but fine exhaust forge SR Racing, that is Kawasaki Z 750 no problem. “It sounds very good right from the factory. That’s why I’m bidding for them Z 750 no silencer on ”, he tells MOTORRAD a rejection of the planned test.
Most retrofit silencer suppliers disagree, however. In the end, 15 packages are stacked in the editorial office. All accessory pots have an EC operation-
permit (EG-BE), which, however, expires if the removable attenuator inserts (»dB-Eater« or »dB-Killer«) are removed.
It makes sense that the test subjects pass the test criteria (see page 68) legally, i.e. with the use of the damper. First of all,
it was to show strength in the performance measurements on the clutch, which MOTORRAD determined as always on the Dynojet roller test bench 150. Because the test machine already has 14,000 kilometers on the clock, it also competes with a brand-new standard silencer for reasons of equal opportunities. With 106 hp it does not quite reach the factory specification of 110 hp
on the crankshaft, but still proves to be a tough nut to crack
for some participants. This is how the Ixil pot elicits the Kawasaki a peak performance of just 101 hp. There is also the turning-
moment progress does not reach the level of the original exhaust, the Ixil carries the red lantern in this prestigious discipline.
The top performance is the Nikko with an increase of three hp. Just behind are Hurric (without Kat) and the Kataly-
sator variants from Sebring, Remus and Holeshot, which proves that the exhaust gas cleaner does not necessarily impair performance. That’s a good thing, because with the entry into force of the amendment directive 2005/30 / EC on May 18, 2006, new ones must
homologating retrofit exhaust systems also have a Kata-
if the motorcycle in question is already equipped with it at the factory. The previously offered retrofit exhaust-
Systems without Kat keep their EG-BE.
During the sound check, which is part of a MOTORRAD exhaust test for the first time, the standard Kawasaki actually proves to be a feast for the ears and, with its hoarse hissing, underlined by a bassy basic tone and pithy babbling in push mode, degrades a number of competitors to acoustic fabric softeners. Which one cannot say about the melodious, but much more aggressive-sounding pots by Bos, Holeshot, Hurric, Leovince, Louis, Nikko, Remus and Sebring.
The subsequent noise measurements, which MOTORRAD carried out for the first time with the Federal Highway Research Institute (BASt)-
has led to confirm the suspicion of the unauthorized sound-
Doping: Although they are still within the
Tolerance of five dB (A), do these models exceed ??
except for the holeshot muffler ?? the legal driving noise limit of 80 dB (A), above all the loud roaring pipes from Leovince and Louis. In light of this appear
the good performances of Nikko, Remus or Sebring on the test bench in a completely new light. Because of the possible
costly consequences for the holder in case of traffic-
control ?? the discretion ranges from fine to
immediate shutdown ?? MOTORRAD removes the too loud silencers from the rating.
So the holeshot wins this comparison. However, the fact that the original silencer hardly performs worse gives food for thought. And Sepp Bruckschlogl right.

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Listening games

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Exhaust systems for Kawasaki Z 750: test – Giannelli aluminum

-Verdict: satisfactory

Plus good fit; lighter than series; quiet, clearly below the driving noise limit value; acceptable workmanship
Minus Provides a slight power and torque-
loss over the entire speed range; subtle grumbling at low speeds, otherwise more cautious and
a bit stuffed sounding, much less spectacular than the series; cheap-looking, fiddly to assemble and sharp-edged universal clamp with rubber pad
Conclusion Inexpensive, but quite voluminous oval sound-
damper that doesn’t tear you off your feet, neither in terms of sound nor performance

Exhaust systems for Kawasaki Z 750: Test – Kawasaki Z 750 original silencer

-Verdict: good

Plus excellent fit, very easy and quick assembly; concealed welded holder; complete off-
stainless steel pouf; despite legal driving noise values
great sound, whose melodious spectrum differs from the
pithy, dull grumbling in the speed cellar to hoarse hissing on higher tours; Catalyst; enables good performance
Minus Very high weight; very expensive; sober, functional processing without optical finesse
Conclusion Oval original silencer, which, despite good noise damping, stands out positively from many other standard silencers with its pleasant, pithy, muffled sound

Exhaust systems for Kawasaki Z 750: test – Akrapovic SP slip-on

-Verdict: good

Plus excellent fit, very easy and quick assembly; precisely pre-formed carbon retaining clip; very good workmanship; very light absorption damper; Performance-
folding at series level; Driving noise limit complied with
Minus high price; restrained, dull sound that
compared to the series has a less pronounced sound character; no catalyst
Conclusion Extremely light oval damper with titanium jacket, the
in terms of power delivery with the standard exhaust
can easily compete, but the sound has a bit of oomph
misses

Exhaust systems for Kawasaki Z 750: Test – BOS Oval Slip-on

-Verdict: ??*

Plus great workmanship; very good fit and assembly, model-specific holder, screwed on in a concealed manner; Performance-
folding at series level with slight torque advantages in the medium speed range; throaty, dull sound with an aggressive rumbling note at high speeds; significantly lighter than series
Minus Exceeds the driving noise limit value
Conclusion Nicely made oval muffler with a great sound
and good power delivery, the driving noise values ​​of which, however, are above the legal limit

Exhaust systems for Kawasaki Z 750: Test – BSM Future Extreme

-Verdict: satisfactory

Plus good workmanship and great fit; easier than
Series; relatively slim and short damper; quiet, keep driving-
noise limit value without any problems
Minus Provides a slight power and torque-
loss; Exhaust sounds pressed and clogged, sound in the
entire speed range less spectacular than series; cheap
Acting, sharp-edged universal clamp with rubber underlay, also difficult to assemble
Conclusion Inexpensive, compact round silencer made of stainless steel, which cannot hold a candle to the original either in terms of sound or performance

Exhaust systems for Kawasaki Z 750: Test – Devil Magnum

-Verdict: satisfactory

Plus very good fit; significantly lighter than series;
complies with the driving noise limit value
Minus peak power and maximum torque below series level; restrained sound without a bass foundation,
which takes on a bright, aggressively barking tone at higher speeds; cheap-looking, sharp-edged universal clamp,
which is awkward to assemble; partially protruding rivet strips on the end caps
Conclusion oval muffler with very bright, at high speed-
pay unpleasant barking sound that is performance-wise
is inferior to the standard exhaust

Exhaust systems for Kawasaki Z 750: test – Louis Streetfighter

-Verdict: ??*

Plus very good fit; significantly lighter than series; robust, aggressive sound; Top performance at the level of the series, torque curve in the middle range a little better
Minus Very loud, driving noise limit becomes clear
exceeded; cheap looking, cumbersome to assemble
and sharp-edged universal clamp; no catalyst
Conclusion Very cheap and short round silencer with
Acceptable workmanship and good performance, but its sporty sound clearly exceeds the legal driving noise limit

Exhaust systems for Kawasaki Z 750: Test – Leovince SBK Evolution 2

-Verdict: ??*

Plus great workmanship and fit; significantly lighter than series; very slim damper; great sound with a muffled, bassy basic tone and sporty, aggressive roaring at higher speeds; Performance development at the level of the series
Minus Very loud, driving noise limit becomes clear
exceeded; cheap looking, cumbersome to assemble
and sharp-edged universal clamp; no catalyst
Conclusion Very slim and inexpensive oval silencer
with good performance and an aggressive, muffled sound, the volume of which, however, drastically exceeds the legal limit

Exhaust systems for Kawasaki Z 750: test – Nikko Supersport NX

-Verdict: ??*

Plus very good workmanship and fit; lighter than series; the Z 750 enables the highest peak performance; great sound that leaves nothing to be desired, from the dull, hoarse sound in the lower rev range to the aggressive screeching at high revs
Minus Too loud, exceeds the driving noise limit value;
cheap-looking, awkward to assemble and sharp-edged universal clamp; no catalyst
Conclusion Relatively expensive, well-made oval silencer with the highest peak performance in the test, but whose throaty, dull sound exceeds the driving noise limit

Exhaust systems for Kawasaki Z 750: test – IXIL aluminum

-Verdict: satisfactory

Plus very good fit; lighter than series; complies with the driving noise limit value without any problems
Minus Provides the greatest power and torque-
loss in the test field; subtle grumbling in the lower speed-
otherwise the sound does not quite achieve the robust character of the series; cheap-looking, sharp-edged and awkward to assemble universal clamp with rubber pad;
no catalyst
Conclusion Neatly processed round silencer with the
the Kawasaki, however, clearly in terms of power and torque
loses without increasing the sound; All in all, no recommendation for the Z 750

Exhaust systems for Kawasaki Z 750: Test – Laser Duotech

-Verdict: good

Plus great workmanship and fit; easy assembly; model-specific holder, screwed on in a concealed manner; easier
as a series; complies with the driving noise limit value
Minus Despite the slightly improved torque curve, the laser gives the Z 750 a slight loss of peak power; tame sound that seems a bit clogged, especially at higher speeds; no catalyst
Conclusion Nicely made oval muffler, which however
In terms of sound and peak performance, the standard silencer has to be beaten

Exhaust systems for Kawasaki Z 750: Test – Hurric RAC 1

-Verdict: ??*

Plus very good fit and workmanship; easy and quick assembly; model-specific holder, screwed on in a concealed manner; dull, sporty-aggressive sound; helps to achieve a slight increase in performance (damper without cat); Catalytic converter variant: peak performance minimally worse than series production with a slightly better torque curve; lighter than the original damper
Minus Both damper variants (both with and without a catalytic converter) drown out the driving noise limit
Conclusion oval silencer with a sporty, aggressive sound,
which, however, exceeds the driving noise limit value ?? also as a Kat version? exceeds

Exhaust systems for Kawasaki Z 750: Test – Holeshot Master Kat

-Verdict: very good

Plus good workmanship and great fit; Catalyst;
helps to achieve more peak performance and provides a plus in torque, especially in the medium speed range;
gritty sound with high fun potential, ranging from bassy grumbling in the lower range to aggressive horns at high speeds; lighter than series; complies with driving noise limit value; Copper paste for assembly included in delivery
Minus cheap-looking, cumbersome to assemble and
sharp-edged retaining clip
Conclusion Relatively cheaper, compared to the original, significantly cheaper round silencer with catalyst, which is superior to the series in terms of performance and sound

Exhaust systems for Kawasaki Z 750: Test – Remus Revolution with Kat

-Verdict: ??*

Plus very good workmanship and fit; easy construction; model-specific holder, screwed on in a concealed manner; easier
as a series; Power and torque development better than series; pithy sound that hisses loudly at high speeds; detailed assembly instructions; catalyst
Minus Too loud, exceeds the driving noise limit value
Conclusion Very well made oval muffler with catalytic converter and great power development, the one with its robust end-
However, the puffing noise exceeds the driving noise limit value

Exhaust systems for Kawasaki Z 750: Test – Sebring Twister with Kat

-Verdict: ??*

Plus very good fit, easy and quick assembly; model-specific holder, screwed on in a concealed manner; great workmanship; helps to achieve more top performance and ensures
a plus in torque in the medium speed range;
sporty, aggressive sound at higher speeds; catalyst
Minus Too loud, exceeds the driving noise limit value
Conclusion Very well made, relatively short and slimmer
Oval damper with catalytic converter, which improves the performance of the Kawasaki, but sounds too loud

Termignoni Retro-Style – Termignoni Retro-Style

-Verdict: good

Plus excellent workmanship; excellent fit;
easy assembly thanks to precisely fitting welded holder; significantly lighter than series; exceptional styling;
subtle hoarse hissing; complies with the driving noise limit value
Not quite minus power and torque development
at the level of the series; no catalyst
Conclusion Very slim, one-piece round silencer, its conical shape from the mass of accessory silencers
stands out, but the performance of the Z 750 is low-
docile diminishes

Exhaust systems for Kawasaki Z 750: Test – This is how it was tested

For the first time, MOTORRAD assesses exhaust systems using a point system. In addition to objective criteria, the subjective impressions of the sound check are also assessed. The weight does not matter this time, as the manufacturers were free to choose the material used for the test muffler.
The criteria of workmanship, fit and ease of assembly are a pleasant chapter for most of the participants. Points are only deducted for those products that are equipped with a fiddly, mostly very sharp-edged universal clamp instead of a precisely fitting holder.
For the performance measurements, the
rated best of three test bench runs. Because at
Experience has shown that no major differences are to be expected in peak performance, the development of performance is of greater importance. So can
some dampers make up ground again with good power delivery in the middle speed range despite the loss of peak power.
For the sound check, the testers went on a quiet country road. The sound of the pots was assessed separately both by the driver and by a “listening post” standing on the roadside.
In the case of the Z 750, the individual sound character of an exhaust can be clearly heard when accelerating past in third gear at speeds of 1500 rpm to around 7000 rpm. About it
mix exhaust sound and mechanical Ge-
rustle to a high-frequency screeching melange.
For the noise measurements, MOTORRAD received support from the Federal Highway Research Institute-
system (BASt) in Bergisch-Gladbach. BASt has the standard asphalt prescribed for noise measurements (absorbs a maximum of ten percent of the sound) as well as impressive technical equipment that practically rules out incorrect measurements. So the pilot completes the driving noise measurements with a GPS transmitter and receiver unit, which he
in a backpack. In addition to the distance covered and the respective speed, the speed is also transmitted via radio signal. Before each measurement run, the temperature and wind speed are meticulously recorded .
Then the pilot drives at exactly 50 km / h, initially in second gear, towards the 20-meter-long measuring section. At the beginning he accelerates at full throttle. Two microphones positioned in the middle of the measuring section simultaneously measure the sound pressure level on both sides and transmit the data to the central computer. The values ​​transmitted by radio are also received there. The entry speed, the sound pressure level for left and right, the increase in engine speed, the speed, the distance covered and the averaged acceleration can be read off at a glance on the screen .
If the run-in speed was correct, the measurement is repeated in second gear, followed by two measurement runs in third. From the mean of
a total of four measurements, each reduced by
one dB (A) (decibel), then the driving is calculated-
noise level.
For the stationary noise measurements, the measuring microphone is positioned at an angle of 45 degrees to the outlet mouth. Because the tachometer
A motorcycle is more or less ahead, the BASt professionals measure with a knock-
sensor, which forwards the exact speed to the digital measuring device via structure-borne noise, which is used in
will probably also be used for traffic controls in the foreseeable future.

Exhaust systems for Kawasaki Z 750: test

Conclusion
This exhaust test shows once more,
how difficult it is for suppliers to-
Upgrade dampers to bring power, sound and legal driving noise under one roof. The original pot is very heavy and not un-
requires jewelry-
piece, but the Z 750 makes it possible
a good performance-
unfolding and about-
testifies with a be-
impressive ?? and
especially law-
conform ?? Sound.
Better in the disciplines-
plinen sound and
Performance is just the holeshot, the Akra-
Keeps povic, Termignoni and Laser at a distance. Bos, Hurric, Leovince, Louis, Nikko, Remus and Sebring also collect rich-
lich points, but are
too loud and are therefore not rated.

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