Izzone's Akrapovic install, Dyno and friends
01-10-2012 | 01:42 AM
#61
Three Wheelin'
Joined: Jul 2006
Posts: 1,771
Likes: 0
From: North Vancouver, Canada
Ok, I buy the explanation of the difference btw how Akrapovic and stock center sections are constructed. Does anyone know how the Cup center section works? That, especially if found used, might be the most cost effective solution.
Serge - if you are reading this, could you share with us the rough cost to source the Cup rear muffler? Many many thanks!
Best, w
Serge - if you are reading this, could you share with us the rough cost to source the Cup rear muffler? Many many thanks!
Best, w
01-10-2012 | 01:43 PM
#62
Rennlist Member
Joined: Jan 2008
Posts: 29,452
Likes: 1,700
From: S. Florida
I just went to Dyno new exhaust setup.
Not sure I can live with the Booming noise at low RPM for daily driving, yout I think quieter at wot.
Just pulled 427hp and 296 tq so 7hp more but 8tq less.
Not sure I can live with the Booming noise at low RPM for daily driving, yout I think quieter at wot.
Just pulled 427hp and 296 tq so 7hp more but 8tq less.
01-10-2012 | 02:04 PM
#63
Rennlist Member
Joined: Dec 2003
Posts: 1,230
Likes: 12
From: Gualala
even a small amount. Booming noise however is okay as I am old and near deaf in my left ear anyway
good luck!
01-10-2012 | 02:07 PM
#64
Rennlist Member
Joined: Oct 2002
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From: S.F Bay Area
01-10-2012 | 03:05 PM
#65
Banned
Joined: Aug 2011
Posts: 3,665
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From: 6feet under snow of CANADA
1)This was using the stock final muffler and j pipes that bypass the side mufflers correct?
2)TRAKCAR can you post pics of what your setup looks like??
3)Are you going to be using this setup at winterfest ??
01-10-2012 | 03:59 PM
#66
Rennlist Member
Joined: Jan 2008
Posts: 29,452
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From: S. Florida
This setup loud from idle, but seems quieter 3000RPM and up.
I will try it out at Winterfest and drive it on the street for a few weeks to see if I can get used to it.
Video of the Dyno pull and printout to follow.
01-10-2012 | 04:25 PM
#68
Nordschleife Master
Joined: Dec 2008
Posts: 7,342
Likes: 294
From: Florida
01-10-2012 | 04:28 PM
#69
Nordschleife Master
Joined: Dec 2008
Posts: 7,342
Likes: 294
From: Florida
At low RPM with sharky the sides are burping most of the sound.....as you add gas less exhaust volmue as a percentage of total is "burped" in the sides
With no sides and big rear the exhaust might be "boomier" at idle but the sound should be linear to WOT.
The key to removing the sides is get a muffler that is tuned to be the sole rear muffler
01-10-2012 | 05:18 PM
#70
Rennlist Member
Joined: Jan 2008
Posts: 29,452
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From: S. Florida
Here is my Dyno pull, you can't really hear the sound level very well, but ii has a similar sound level to Randy's Acropovic I think.
Bought some ice cream for Rad, while keeping him honest ;-)
http://www.youtube.com/watch?v=0M1Fj...ature=youtu.be
Bought some ice cream for Rad, while keeping him honest ;-)
http://www.youtube.com/watch?v=0M1Fj...ature=youtu.be
01-10-2012 | 05:20 PM
#71
Nordschleife Master
Joined: Dec 2008
Posts: 7,342
Likes: 294
From: Florida
Here is my Dyno pull, you can't really hear the sound level very well, but ii has a similar sound level to Randy's Acropovic I think.
Bought some ice cream for Rad, while keeping him honest ;-)
http://www.youtube.com/watch?v=0M1Fj...ature=youtu.be
Bought some ice cream for Rad, while keeping him honest ;-)
http://www.youtube.com/watch?v=0M1Fj...ature=youtu.be
01-10-2012 | 08:37 PM
#73
Rennlist Member
Joined: May 2006
Posts: 6,222
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From: sydney
drone is no good.
love affair doesn't last long...
my car sounds great above 3000rpms, but drones below. in the last few years (along with djing in my youth) it has caused my ears to ring 24/7. ears can handle the volume at wot, it's the 'booming, all-encompassing basslines' of the drone that is the culprit.
on track there is no drone, street is where low revs are constantly used in traffic stop/go. i am close to putting stock exhaust back on.
love affair doesn't last long...
my car sounds great above 3000rpms, but drones below. in the last few years (along with djing in my youth) it has caused my ears to ring 24/7. ears can handle the volume at wot, it's the 'booming, all-encompassing basslines' of the drone that is the culprit.
on track there is no drone, street is where low revs are constantly used in traffic stop/go. i am close to putting stock exhaust back on.
01-11-2012 | 07:35 AM
#75
Three Wheelin'
Joined: May 2004
Posts: 1,590
Likes: 223
From: Belgium
i have a M&M centre bypass on my car.
Here is a soundclip.
It's a mix from some car spotters at different times with the standard exhaust and the m&m.
I think it's obvious when the bypass is on the car
Here is a soundclip.
It's a mix from some car spotters at different times with the standard exhaust and the m&m.
I think it's obvious when the bypass is on the car
so m&m is not FVD>? I think the FVD one was mentioned. Post a link of it for others who are new and learning
see post 75 and 76 of this thread i think there is some FVD in there. Lots of good exhaust science around thanks to izzone and trackcar, mdrms, rsranger, msevobr an well....everyone
Cant wait to see these dynos an hear how trackcars jpipe rig goes at winterfest. I may end up looking into a fvd setup who knows just yet
https://rennlist.com/forums/997-gt2-...weights-6.html
see post 75 and 76 of this thread i think there is some FVD in there. Lots of good exhaust science around thanks to izzone and trackcar, mdrms, rsranger, msevobr an well....everyone
Cant wait to see these dynos an hear how trackcars jpipe rig goes at winterfest. I may end up looking into a fvd setup who knows just yet
https://rennlist.com/forums/997-gt2-...weights-6.html