2004 Mazda RX-8 6MT Review, Walkaround, Exhaust & Test Drive
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Meet the first model year of Mazda's rotary powered sports car, with a
feathery curb weight, perfect 50/50 weight distribution, and RWD it was
everything that a sports car should be. Unfortunately, it also had some of
the compromises and quirks of your typical sports car.
Mad Mike Red Bull RX8 Drift Demo - WRC Brother Rally New Zealand 2012
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Mad Mike's freshly rebuilt RX8 fires up for the WRC Brother Rally Of New
Zealand, putting on a drift demo around the scenic Auckland Domain. Mike
gives us a preview of whats to come when the car is fully finished ahead of
World Time Attack and the Tectaloy International Drift Challenge..
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Video By SBPnz
Kiwi-RE 20B turbo Brap Brap Brap
RX-8 TurboXS headerback with new muffler...
I was looking for a way to reduce the sound of my 3" turboxs headerback Exhaust system, but to keep the Exhaust free flowing. So I looked into all the
usual places, and at the usual mufflers everyone here have been installing.
I ended up getting something that is similar to a straight pipe setup, but
without any packing material.
So what I bought was a pre-muffler system... here's some of the promotional
info about it:
These muffler replacements make use of a design so unique that is a
patented design. First of all the design is a "straight through" design.
Thus not creating back pressure by placing baffles or pulse diverters in
the path of air flow. No packing is used. The Insert requires no case,
saving weight. It is so effective that an Insert weighing no more than ¾'s
of a pound will allow virtually any engine to meet the sound requirements,
with minimal to no power loss. In fact low and midrange power generally
increases. Where top end power is lost it can be compensated for with the
normal tuning change typically needed with a slight increase in back
pressure. Since scavenging is a function of the free flow of the Exhaust pulse, a design such as the CC INSERTS
does not negate the scavenging effect of an uninterrupted pulse. The unit
is so compact that the Insert is only about 7" long and can be cut even
shorter if needed. For racing or street use you only need one Insert in
each collector or Exhaust pipe.
What is really neat is that you can build an Exhaust system where NO MUFFLERS are needed. You
can do away with the big clunky, inefficient boxes that hang under the car.
Ground clearance improves and you can route the pipes wherever you wish
without worrying about where to place this big box. Pipes can be located
closer to the body than previously possible giving even better ground
When it comes to sound the Inserts give a true High Performance effect. In
fact they have been described as sounding just like open headers only
quiet. The Insert produces a deep sound with a sharp crisp note. The design
of the Insert is such that most of the higher frequencies are cancelled
out, leaving the deeper lower tone to dominate. The straight through design
gives the crisp note. The higher, sharper frequencies are the most
objectionable to both the rule makers and the ear. As an added feature you
can adjust the level of sound that you desire. Each Insert comes with a
plug and a restrictor. These items can be tack welded on for the most sound
suppression. If you do not use the plug, which diverts more air through the
cooling chambers, you get an increased level of sound. If you use the
inserts without either part you have the loudest note. Even at their
loudest setting the units are still very acceptable for the street. You get
to make the choice you are not stuck with only one level of sound, as you
are with most designs.
What makes these Inserts so effective? The design seems simple at first.
Lets examine what happens to the Exhaust pulse as it reaches the Insert. First a
portion of the flow moves directly through the center tube, the balance is
directed through the first disk. This creates a higher pressure zone in the
area outside of the center tube. The result is that the air flow through
the center tube is now faster,
creating a low pressure zone in the tube. Since the tube is louvered a
portion of the air that passes through the first disk is drawn back into
the center tube. This helps draw more air through the first disk, thus
reducing the back pressure created when the air first encounters this disk.
By drawing slower moving, cooler air back into the center tube we reduce
sound. Cooler air is quieter than hot air. The remaining air that is not
drawn into the center tube flows through the next insert, thus slowing the
flow and cooling this air even further. Then the difference in pressure
between the two air flows pulls additional, cooler air back into the center
tube. This further reduces the sound of the Exhaust gases. If a three disk unit is used the
same process is repeated. When the last disk has been passed the remaining
air flow exiting the tube, but not drawn into it, mixes with the air
flowing out of the center tube further cooling the air. This design not
only cools the Exhaust gases, to
reduce sound, but by mixing the separate air flows multiple times, further
reduces the sound emitted.
Pettit Racing RX8 Modular Exhaust System
Pettit Racing new Mazda RX8 full Exhaust system, with catback, hi flow resonated
cat, or resonated race-pipe.
Walk through of system with Milltek engineer.
in the UK / EU etc, or at www.pettitracing.com in the USA ETC