isntalling silencer

[stanleym]

hey just bought silencer not positive about install.....

do i push it into the exhaust tip all the way to the back or do i just fit it to front???

please help cheers

[EuroDude]

My friend had one on his skyline and it was just within the tip, so I think thats the correct place to put it.

[chee]

silncer should sit flush with the tip of the exhaust.

[EuroDude]

It looks a bit lame being right at the tip though :p
Maybe u could try putting it a bit further in and test the sound of it.

[dsp26]

no its not. if its the N1 type with the thin pipe that extends, that piece is supposed to be in the body of the cannon therefore pushed it.

[dsp26]

http://img.photobucket.com/albums/v281/dsp26/N1Design.jpg

[stanleym]

yea i got it like the pic at the moment but i have seen pics with it on the tip thats why i not positive......

to be honest it aint makin much difference so sound thats why i was wonderin

[dsp26]

yeah i know what you mean.. the resulting backpressure from the reversing exhaust flow is supposed to disrupt the exhaust flow resonance.

the only other trick thats been decibel tested to work is to use industrial wire scrubs (the really dense fine ones you buy from bunnings, not the cheapo shit from woolies) and wrap a shitload around the pipe of the silencer. There was a nissan pulsar that had his decibel tested to reduce a further 3dB but how thick and how much he put on was unkown.

[EuroDude]

I think the Merc SLK has a sports mode that can modify the exhaust loudness from one flick of a switch, using an actuator within the muffler. Would be nice if they were available as an aftermarket mod.

[stanleym]

yea.... i got trouble aswell my muffler tip is an 4.5" tip and well i cant find a silencer that is that big ....... autojoy guy sold me a 4" one because i knew nothing about silencers at the time... so thats sittin in there at the moment not doing much (still works a little)

can any1 suggest where i could source a 4.5" silencer

cheers

[dsp26]

I think the Merc SLK has a sports mode that can modify the exhaust loudness from one flick of a switch, using an actuator within the muffler. Would be nice if they were available as an aftermarket mod.

They are:thumbsup: :
http://www.gccorp.com.au/automotive/product_info.php?products_id=216
http://www.takakaira.com/asp/template.asp?cat=2&id=1156&prodID=QRrNoOojlKmipLk
Nengun have a few on sale: http://www.nengun.com/catalogue/product/239
http://www.takakaira.com/performance/apex/1156_0.jpg

theres also a variant in the states that switches from catback to open header... now wouldn't you guys love the sound of that and vtec!!!

[dsp26]

yea.... i got trouble aswell my muffler tip is an 4.5" tip and well i cant find a silencer that is that big ....... autojoy guy sold me a 4" one because i knew nothing about silencers at the time... so thats sittin in there at the moment not doing much (still works a little)

can any1 suggest where i could source a 4.5" silencer

cheers

no-one really sells them seperately except eBay:
http://cgi.ebay.com/ebaymotors/Universal-Silencer-For-Exhaust-Muffler-With-4-5-Tip_W0QQitemZ330029587469QQihZ014QQcategoryZ33636Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

search around, theres few nice adjustable ones on there

[stanleym]

yea i worked out the prob thanks for all help

cheers guys

[EuroDude]

They are:thumbsup: :
http://www.gccorp.com.au/automotive/product_info.php?products_id=216
http://www.takakaira.com/asp/template.asp?cat=2&id=1156&prodID=QRrNoOojlKmipLk
Nengun have a few on sale: http://www.nengun.com/catalogue/product/239

theres also a variant in the states that switches from catback to open header... now wouldn't you guys love the sound of that and vtec!!!

Nice, had no idea lol. looks likes a biatch to install it though :p

[Spec_R]

if ya talking about the silencer that you place at the end of your muffler tip, then i have been told that that u rather not use it cos it restrict ur exhaust flow (it decreases your exhaust exit circumference) im not about NA cars but that what i've been told by turbo mechanic people on my previous car.

[stanleym]

i heard it has gains on the bottom end some how

i duno

[Spec_R]

i heard it has gains on the bottom end some how

i duno
i dunno know but i might be wrong but the mechanic told me that when i wanted to install one on my previous turbo car, it might not apply to NA or maybe he doesnt know what he is talking about but i dunno i always believe profession advice well he is a mechanic, even if it does have restriction i dont think it with harm the car and plus it certainly wont decrease much in performance especially NA car.

[dsp26]

depends on the whole engine setup... a completely stock car with a 2.5mandrel bent exhaust all the way (for future mods) will benefit from the slight backpressure a silencer provides.

my NA sr20 lost A LOT of bottom end for a marginal gain in top end response. i say response coz i can't prove the power band moving without dyno-ing it.

as i've said in a previous thread, the exhaust system is something no-one can afford to waste money on twice... if you really must get the big one like i did then put up with it till you actually do more with your engine.

***EDIT***
in all honesty, i don't know the effect on a vtec engine as for starters i don't even know the cam profiles for low/high lobe... but if the high lobe is relatively aggressive in duration then i wouldn't use a silencer.... but until someone dyno's with/without one is probably a poofteenth of a difference in power. i just wan't to clarify that what i did notice was response differences

[Mikeyas]

Here is alot of info i have gathered on variable silencers etc. Ill jsut copy and pastE!

APEXI UNIT - http://www.importscene.com.au/prod466.htm

The APEXi Exhaust Control Valve (ECV) controls the
amount of exhaust flow from an exhaust muffler and thus
varies the loudness of the exhaust volume. The ECV is
installed after the catalytic converter in a vehicle's exhaust
system. It can easily reduce the exhaust loudness level by a
maximum of 10dB by varying the butterfly valve in the ECV.
With the ECV, you can now maximize a high performance
car potential; be it driving in urban areas, at night, or in
areas with strict sound emission laws, just by varying the
butterfly valve opening in the ECV.
All these adjustments can be done in the cockpit on the fly
by wire controls of the ECV. The butterfly valve can be
controlled in real time while driving either with the valve in
fully opened, fully closed, or partially opened position.
Before the invention of the APEXi ECV, exhaust sound
levels could only be controlled by using different inner
silencers in an exhaust muffler. These inner silencers
require vehicle down time to install, dismantle, and re-install
to achieve similar performance levels of the ECV.
The ECV replaces the connecting flange on the piping (after
the catalytic converter) that connects to the catalytic
converter. The wire that controls the butterfly valve on the
ECV runs via the heat sensor cabling (as in NISSAN
vehicles) and through an opening from the vehicle's under
carriage to the interior of the vehicle where it terminates at
the valve control lever switch in the cockpit (Easily
accessible by the driver). Minor drilling & modification on
exhaust piping after the catalytic converter might be
required on other vehicle makes (e.g. TOYOTA vehicles).
Please select your Pipe or flange size. Either is suitable
depending upon your application. The flange type will fit as
a replacement flange that connects to the catalytic converter
- just choose your flange size. The pipe type will fit AFTER
your existing flange by creating a cut and weld in between
the pipe and is specified in the size of the pipe you are
installing into. See the drop down list below.
See also the DECS - Dynamic Electronic Control System
sold separately which allows you to manage this Exhaust
Control valve electronically
Apexi is proud to introduce the revolutionary DECS ECV
controller. Used in conjunction with the separately sold
Apexi ECV, the DECS ECV Controller instantly transforms
any exhaust system into an electronic high tech variable
sound system! This unit was designed exclusively from
customer feedback for people who demand convenient
electronic sound level adjustment from inside the car.
Product Features
3 modes: MANUAL, AUTO, and CITY
MANUAL Mode-
Manually change the Valve position from 0~99% in 6
increments
Ex:0~20%,0~40%,0~60%,0~80%
100% denotes fully open valve
AUTO Mode-
Program 5% increment valve opening on 5 preset points
between 800~4000 RPM
Simply change to AUTO mode and the ECV will move
according to preset values
CITY Mode-
ECV valve position will stay under 40% when the vehicle is
traveling UNDER 5000RPM
Designed exclusively from customer feedback for night-time
city and neighborhood driving situations
See also the Apexi Exhaust Control Valve sold separately
which is required for use with this product.

[Mikeyas]

APEXI ACTIVE TAIL SILENCER: - http://www.autocarparts.com/part/list/1591/

While many people enjoy the power gains of a racing exhaust on the track, often times these systems require a silencer to
be installed in the tip for use on the street.
While sound output can be dramatically lowered using a non-adjustable silencer, unfortunately response and power tend to
suffer due to increased exhaust gas restriction.
The ATS (Active Tail Silencer) uses the same active valve technology as the PS Revolution exhaust system. The spring
loaded valve is engaged and disengaged based upon exhaust gas pressure.
This allows for effective sound suppression for the street, without the power loss under high load. Dyno tests have proven
power levels to be nearly identical to an exhaust using no silencer at all.
* Please note that, due to the tapered tip of the N1 Evolution exhaust system the ATS Silencer WILL NOT fit properly. This
is only true for the N1 EVOLUTION mufflers, all other exhaust systems will fit without problems.

[Mikeyas]

AES - http://autospeed.drive.com.au/cms/A_2291/article.html

We first introduced you to Kevin Davis’ active exhaust butterfly valve in the article Pure Pipe Perfection 2 - Introducing the
Secret Weapon... Nearly four years have passed since this encounter and the system has evolved into a much more
sophisticated package.
Note that the product is also now sold
under the Active Exhaust Systems
(AES) banner – it’s no longer a product
of Variflow Technology.
In this article we’ll look at the system’s
latest specs.
The Principle of the AES Butterfly
At the heart of AES kit is a variable
opening butterfly valve that is fitted as
part a vehicle’s exhaust system. The
butterfly opening is infinitely variable
over a 90 degree range and is
designed to control exhaust noise and
backpressure. The valve is typically
used to reduce noise where a big-bore
aftermarket exhaust is fitted.
When the butterfly valve is closed – or very near closed – it improves noise suppression of mufflers and cat converters.
The valve itself also has a quietening effect. However, when the valve is open, it sacrifices its noise suppression
advantage to allow maximum engine breathing and power.
Put simply, the active exhaust valve provides the best of both worlds – noise suppression and maximum exhaust flow
when you want it.
Control over butterfly valve angle is critical. At any given moment, the valve angle must provide the suitable balance of
noise suppression and engine performance. Typically, the valve is near closed at idle, cruise and part throttle – this gives a
quiet exhaust in all normal driving conditions. However, at wide open throttle, the valve should be fully open for maximum
performance.
These are ‘givens’ – but there are
many grey areas in between…
In previous incarnations of this system,
the butterfly angle was controlled by an
arrangement comprising various bleed
and one-way valves and a large control
box (see photo). This pneumatic
approach to butterfly angle was
relatively simple and effective, but –
according to Kevin Davis - it was
relatively slow reacting and inaccurate.
• $550
Plus Postage
WEB REFERANCE: http://autospeed.drive.com.au/cms/A_2291/article.html
Latest Developments
In the years following our initial test of the active exhaust valve, Kevin has made numerous enhancements...
Butterfly Valve Improvements
The butterfly valve and housing
assembly are largely unchanged – the
butterfly is made from 316 stainless
steel and the housing is cast alloy.
Kevin says this combination has
proven 100 percent reliable in service.
The valve is installed to a vehicle’s
exhaust system using a pair of steel
flanges – these allow easy removal
and eliminate the problem of trying to
weld dissimilar metals.
The biggest change to the butterfly
valve is the adoption of dual bushes.
The dual bushes let the valve rotate
smoother and faster than the previous
arrangement, which employed only a
single bush. Kevin says the new
valve’s bushes and shaft are made
from the same sort of materials you’ll
find in external wastegates – their high
temperature resistance makes them
ideal.
The vacuum actuator – which pulls the valve closed for normal driving conditions – remains the same as previously.
Note that the valve is available to suit 2 ½, 3, 3 ½ and 4 inch pipe diameters.
Control System Improvements
The most dramatic area of
improvement is control of the exhaust
butterfly.
The latest AES system employs two
parallel solenoid valves to control the
amount of vacuum applied to the
butterfly actuator. Kevin says this
improves the precision of butterfly
control compared to the previous
arrangement.
Vacuum is made available to the
solenoids via a hose from the engine’s
intake manifold. This hose is also fitted
with a restrictor and one-way valve.
The one-way valve serves to store
vacuum in the system (vacuum being
necessary to close the butterfly).
The AES butterfly valve can be
controlled with a choice of strategies.
Butterfly Effect—Article PART 2
Active Exhaust Systems' latest electronically-controlled exhaust butterfly
• $550
Plus Postage
WEB REFERANCE: http://autospeed.drive.com.au/cms/A_2291/article.html
The most basic approach is to tie butterfly valve angle with throttle position. At small throttle openings, the valve will be
closed while at large throttle openings it will switch to fully open. Once fully opened, the valve will then return to its normally
closed position after a user-definable period. This period is adjustable from 6 to 16 seconds using a trim-pot on the control
box.
Note that a dedicated micro-switch
can be added to vehicles not already
equipped with a 0 – 5V TPS signal.
The next (optional) step is to
incorporate an in-cabin switch that
fully opens the butterfly irrespective
of other factors. This switch is
teamed with an in-cabin LED that
indicates system status – the LED
illuminates when the valve is set to
fully open.
If you don’t want to tie butterfly angle
with throttle position, it is possible to
use engine rpm as the primary input.
Note that the rpm input can be used
only where an aftermarket ECU is
installed. (However, we imagine you
can add a shift-light based rpm
switch to perform the same function).
For further improved
results, the system’s rpm
input can be employed
together with the TPS
input.
Kevin tells us throttle
position and rpm based
butterfly control are the
most commonly used
strategies. But there is
another more
sophisticated approach
that can be taken...
The latest AES system
can be arranged in a socalled
“self-regulating”
configuration. By tapping
into the front section of
exhaust you can feed a
backpressure input into
the control unit. The control unit recognizes when backpressure reaches your predetermined value (which is trim-pot
adjustable up to 5 psi) and automatically opens the butterfly to allow maximum breathing. In all other situations, the
butterfly remains in a closed position for maximum noise suppression.
Butterfly Effect—Article PART 3
Active Exhaust Systems' latest electronically-controlled exhaust butterfly
• $550
Plus Postage
WEB REFERANCE: http://autospeed.drive.com.au/cms/A_2291/article.html
Here’s a real-world scenario using the self-regulating mode...
Let’s say your newly installed
aftermarket exhaust causes up to 3 psi
backpressure at full power. If this is the
case, Kevin suggests setting the
backpressure trigger value to around
2.5 psi. This will give a qiet exhaust
note at all times except for when you’re
wringing the last bit of power out of the
engine. The downside of this approach
is additional backpressure in normal
driving.
The new AES control system is
contained in a relatively compact
extruded aluminium enclosure. The
enclosure can be seen in this photo
alongside the ABS unit. Note that the
latest production models are painted
blue and are labelled AES.
Where and How Much?
The latest AES system can be
purchased through Active Exhaust
Systems for AUD$550 (plus postage).
The product comes backed by a 12
month warranty. Note that, at the time
of writing, HyperFlow
(www.hyperflow.com.au) were also
looking to become distributors.
If you’ve got an exhaust that’s a bit on
the loud side but you don’t want to
strangle it with extra mufflers, we highly
recommend that you give it a go.
Contact:
Active Exhaust Systems Australia
0409 288 347
kevindavis@exemail.com.au

[Mikeyas]

POWERED EXHAUST BYPASS -

As hard as this is to believe I hate loud cars. I love the
rumble of a deep exhaust and I love open headers at the
track. The problem is I also enjoy to drive my car and there
is nothing more annoying than a constant roar when you are
trying to drive somewhere. It is awesome when you pull up
to the occasional Honda with a 4" exhaust tip. As you can
see by looking at my current exhaust system I went to
excruciating pains to keep it as quite as I could while not
restricting the engine badly.
Having done this I also realize that power is made by
ingesting air into the engine, mixing it with fuel, burning the
mixture, and releasing the burnt fuel mixture out the
exhaust. If any of these processes are inefficient or
restricted you will loose power. That is why I installed the
FloPro Twister mufflers as resonators before and after my
actual mufflers (yes, that's right - I have 6 mufflers on my
car). The problem is I hate crawling under the car to uncork
the exhaust. In my dream world I would flip a switch and the
exhaust would open.
To make my dream come true the valve that closes the
exhaust would have to be a high quality valve and not leak.
The only thing more annoying than open exhaust on a long
drive is a constant exhaust leak you can hear. For durability
the valve should be stainless. To insure it stays closed and
opens properly you would need a strong motor. How would
you find such a thing?
As some may remember I had a previous system that
allowed me to open my exhaust but with my new 3" MAC
exhaust system there was no room for it. After searching
the net and asking everyone I know I have found a system
that actually provides more functionality in a more compact
package that will work in more situations.
I contacted Dave at dmhperformance.com and talked to him
about what I was looking for.
The valves arrived and I have to say they are truly amazing!
You can see the completed exhaust system in the photo on
the right. The valves are installed just before the primary
mufflers but after the first set of Twister resonators. This
way even with the exhaust open I am legal on the street (still
using mufflers). With the valves open the system is very
loud and aggressive. With the system closed it is very
conservative with the only indication of power being the
choppy idle. Just the way I wanted it!

[Mikeyas]

Fujitsubo—Legalis V/Able - http://www.fujitsubo.co.jp/mc-prod/psrs-v.php3?id=00000083

From the cockpit unrestrictedly exhaust volume and the epoch-making muffler which can control output characteristics.
With automatic mode the ideal system which adjusts exhaust pressure real time according to boost pressure. That with
manual mode you can adjust in optional volume output characteristics, of course with automatic mode it adjusted exhaust
pressure in real time according to boost pressure, the power impression the torque impression when turning and the
coming out at the time of high revolution being good low actualized, learned ideal efficiency as a sport muffler, that is
“Legalis VIABLE”.
Fujitsubo—Legalis V/Able

There is also a new unit form xforce comming out, but hope you can benefit from the information i have found

[TypeRice]

i haf a sports silencer.. which makes my exhaust not as loud...

and i was told if i want it to be louder i gotta change the exhaust tip ??

*shrugs*

[dsp26]

^^what fool told you that?

exhaust resonance is controlled by:
- pipe size
- resonator size
- muffler/cannon body size