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Exhaust Performance


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#1
primus2211

Posted 26 May 2005 - 11:22 AM

primus2211

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Hi Guys / Gals,

For most of us who feels that an aftermarket muffler doesn't add much to
you cars performance, hopefully this dyno chart would change that mind
set.

For a brief explanation, the top chart shows the car results by itself
while the 2nd shows it comparatively with another car of near similar
specs. This was done on a seperate time between the 2 cars and of course
there are some minor differences like mileage and brand of mods but the
mods are identically spec'd. The only major difference is one runs on
stock and the other is on aftermarket rear muffler.

I feel skeptical on the results as well but after much mulling, can't
figure out why the result would be so significantly different in view of
the fact that everything else is near identical in spec. Maybe some of
the more experience guys can help to explain?

If not the betetr go get your aftermarket mufflers!

http://img273.echo.c...parative0dg.jpg

Disclaimer: I'm in no way affiliated in any tuning or aftermarket sales
office/rep. This is more for the purpose of understanding and information
sharing.Big Smile

#2
A4orce

Posted 26 May 2005 - 12:04 PM

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Wah primus2211, those are healthy figures that your ride is pumping out. I
understand that your car is chipped, is the other car in comparison as per
the dyno result chipped as well? Same make?

Also, do you have figures for before and after the mufflers were
installed? This would give a better picture of how much gain you'd get
with the muffler.

But as it is, I wouldn't argue with the results anyway Big Smile

#3
primus2211

Posted 26 May 2005 - 12:15 PM

primus2211

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A4orce,

Mine is tuned by REVO while the other car is by a different maker but the
figure should be quite similiar.

On the dyno prior to the muffler, I did once but this was at a different
dyno center which did not provide printout. If I'm not mistaken it was
running somewhere in the region of 193 - 195 but not too sure as it was a
while back. If this is right, the effective gain from the muffler would
be something like 8 - 9 which is decent plus the sound you get at high
speed is well worth it! Big Smile

Time to make a run down south and make lots of noise coming back up man!

#4
jhlk99

Posted 26 May 2005 - 01:21 PM

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I would normally take readings from on-ramp dynamometers with a big pinch
of salt. Two different dynamometers, on different days, different fuel,
different compensations and different engines should be taken with a big
bucket of salt.

The only way you are going to tell the difference is:

1) run the engine on a dyno that measures power at the flywheel, not
practicable; or

2) run a before and after comparison on the same dyno, preferably on the
same tank of fuel, same day with the same compensation factors and the
same engine.

Jonathan

#5
Entreri

Posted 26 May 2005 - 02:37 PM

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9 horses extra.

wow!


click on the link provided for the chart.

#6
primus2211

Posted 26 May 2005 - 03:10 PM

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Jonathan,

Isn't your statement a tad on the contradictory side of things?
Especially on the compensations bit? If you're talking about the old dyno
unit whereby the dyno runs and what you see is what you get, thats fine.

The newer units that you'd find at most of the better places would
include compensation variables in the software that factors in the
following:

1) Atmospheric pressure
2) Humidity
3) Environmental temperature
4) Engine load for the calc of the whp (this done by the free rolling
load test towards the end)

And to clear up the matters a bit more clearly, the last graph is taken
from the same dyno machine, so not much dispute on that fact I guess?

Apart from that, the only point that I can agree is that different engine
and different fuel may be a factor. All else considered the result would
either indicate that either one car was in poor engine condition or
another was running on race fuel, which both I do not believe is so.

If interested, gimme a PM, we can pop by the dyno place to have a looky
to satisfy your curiosity on how they do it over there? I'm always game
to meet new people and it does hurt that it's quite close to my office!
Big Smile

#7
DavidT

Posted 27 May 2005 - 01:54 AM

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Damn primus,

Looks like REVO is kicking out more power than the MTM or APR. I believe
I know what the other car is chipped with. I like data and performance
comparisons like this can only lead to one conclusion. Thanks for sharing
mate. Time to change to REVO Big Smile. Heard mention that REVO is being sued?
But also that the case has been going on for years and there really isn't
a case. Whatever it is, if I'm going to part with my money, I'd like the
biggest bang for my buck.

#8
ycfoo

Posted 27 May 2005 - 08:51 AM

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ShXXt.....!!

it look like much better than my MTM...... hv to do upgrade version to
the program liew!!! or should i change to a bigger backbox ...Evil ah
beng style ke...ke...ke....

#9
Trevis

Posted 27 May 2005 - 09:00 AM

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Perhaps this is not because of the problem of the product but the tuner
is still verdant n does not know how to tune properly or perhaps doesn't
know how to tune at all.
Both cars are Audi A4 same model kah?If that's the case,probably we can
speculate that the other car is not in good shape.Would u mind to
indicate to us the number plate of that car so tt people can shun from
buying it in the future?If u feel tt it's not appropriate to post it
openly,maybe u can forward the email to all the CAM members?Your
assistance on preventing the newbies to get conned would be highly
appreciated .Big Smile

#10
Karl_Erik_Chee

Posted 27 May 2005 - 09:33 AM

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Pls click on the link below for APR's dyno results. Vehicle has only be
installed with a K&N Air Filter and a Forge Diverter Valve. There's no
exhaust installed in the car. If the exhaust is modified, you will
definately see a difference. You draw your own conclusion. Note: picture
may take a day or 2 to be released by forum admin.

DavidT - to answer your question about Revo being sued, they just are.
Get any lawyer (even Trevis - since he hs studying law) to review the
documents in http://www.goapr.com/Audi/revo and the answer is simple -
Revo will lose. I have been informed that Revo's managment & lawyers are
trying to stall for time and delaying the judgement. For the APR
management, it is just a matter of time for the case to conclude itself.

As informed by my boss from Singapore, we know that Aloysius is slashing
his price in Singapore coz his sales is very slow & does not have any
franchise tie-up.

For APR in Singapore - official tie-up with Autovox & 2nd tier partner
with Premium Auto.

For APR in Malaysia - official tuning partner of Quasar Carriage &
registering with Euromobil as official vendor.

For APR in Malaysia & Singapore - there is a USD2mil liability insurance
which will cover the warranty of new vehicles if chipped at the
franchise - therefore, your warranty for the new vehicle will not be
void.