|
|
|
|
Thread Tools | Display Modes |
02-15-2011, 02:51 AM | #101 | ||
Scooby Newbie
Member Sales Rating: (0)
Member#: 141927
Join Date: Feb 2007
|
Quote:
Now I'll tell you a little of my emperical knowledge. Eight dyno tests on eight different four cylinder vehicles, turbocharged and naturally aspirated. Each of these vehicles, in terms of catback gains, we found 90 percent of the gains came from the elimination of final muffler backpressure. 90%! And that is over a stock vehicle test. Now lets talk about exhaust backpressure performance gains. Downpipes, catbacks, in some instances midpipes for vehicles with a two piece factory downpipe each of which have catalysts onboard. In 100% of the dyno runs I have done on exhaust designs across multiple platforms and engine configurations, exhaust gains on boosted vehicles are asymptotic. Meaning that as you pull restrictions out of the system, you reach a point of diminishing returns. If you do a stock vehicle baseline, then throw a downpipe on and do dyno pull tests, you'll see x amount of hp gain (for explanatory purposes we'll say 18hp). If you put the catback on after that, you might see 8hp out of the catback. But if you do the same test the other way around, you might see 13 out of the catback and 13 out of the downpipe. Because these deletions of restriction reach a point of diminishing returns, it is beneficial for any enthusiast to find the most restrictive points in their exhaust system and replace them with less restrictive performance alternatives. If I can sell you a downpipe and an axleback exhaust for a reasonable cost, fit it into a reasonably sized box and get you a good deal on shipping, and the last piece that I do not make is bulky and only makes 3hp gain after you've swapped the downpipe and mufflers out, then I'm doing you a favor. I'm selling you the best bang for the buck. I have a $1100 catback design on the wall at my shop that we tested for almost a MONTH thinking it was going to be our go-to design. Afterward we decided to make a budget alternative which was this AxleBack. When it was finished we couldn't think of a single reason to sell the big catback when the simpler, cheaper and easier to install AxleBack achieved everything that the catback did. Explain what my ulterior motive would be in not selling a product that has a higher price point and thereby a higher overall profit margin? Quote:
No. Catback exhausts are not regulated by the California Air Resources Board. Most noise ordinances are local and you can call your local highway patrol office to ask them what the standard that you need to adhere to locally is in advance. There is usually a decibel rating that they will refer to, just make sure to ask them specifically what the local ordinance numbers are that refer to this. If need be, call your local court house or law library, these are public facilities that you can access as a citizen. The law librarian will be able to point you right to local statutes. Arm yourself with these standards and be polite, but be ready to defend your choice to modify your vehicle in a legal way.
* Registered users of the site do not see these ads.
Last edited by GriffithBuilt; 02-15-2011 at 06:01 AM. |
||
02-15-2011, 08:53 AM | #102 |
Scooby Newbie
Member Sales Rating: (0)
Member#: 273214
Join Date: Feb 2011
Chapter/Region:
MWSOC
Location: Columbus,OH
Vehicle:2013 WRX Limited CBP |
Well put! These aren't V8 muscle cars that require back pressure to make power. Love the sound of my Nameless I just put on last week.
|
02-15-2011, 11:03 AM | #106 |
Scooby Newbie
Member Sales Rating: (0)
Member#: 15553
Join Date: Feb 2002
Chapter/Region:
TXIC
Location: Austin, Texas
Vehicle:'19 Shelby GT350 Tesla MYP/22 Ram 2500 LL |
Why pay $1000 plus for noise and very minimal "gains"? Those "gains" aren't worth a grand to me.
Dammit! I posted without seeing the rest of the other posts. I didnt see them. Last edited by Vectors2Final; 02-15-2011 at 11:12 AM. |
02-15-2011, 11:15 AM | #108 | |
Scooby Newbie
Member Sales Rating: (0)
Member#: 273727
Join Date: Feb 2011
Chapter/Region:
Tri-State
Location: 203
|
Quote:
|
|
02-15-2011, 12:21 PM | #109 |
Scooby Specialist
Member Sales Rating: (21)
Member#: 187179
Join Date: Aug 2008
Chapter/Region:
MAIC
Location: Wherever
Vehicle:14 STi Cocain |
I think that with a this and a mid pipe it would be sufficient. I would really like to get the tests done to see the differences maybe i might just have to.
|
02-15-2011, 03:06 PM | #111 |
Scooby Newbie
Member Sales Rating: (1)
Member#: 266164
Join Date: Dec 2010
Chapter/Region:
NWIC
Location: Seattle Area
Vehicle:2011 STI Sedan Ltd Satin White Pearl |
Check out the comparison vid I posted in the previous page. It shows the stock mufflers give a "putt putt putt" sound while the nameless do not. Maybe that has something to do with the droning sound below 2k with the stock mufflers?
|
02-15-2011, 03:25 PM | #112 | |
Scooby Newbie
Member Sales Rating: (0)
Member#: 141927
Join Date: Feb 2007
|
Quote:
That's the best I can do to explain why a factory baffled muffler has more resonance than a muffler delete that has about ~5dB higher amplitude at the same rpm. J Last edited by GriffithBuilt; 02-15-2011 at 03:34 PM. |
|
02-15-2011, 06:31 PM | #116 |
Scooby Specialist
Member Sales Rating: (2)
Member#: 85575
Join Date: Apr 2005
Chapter/Region:
SCIC
Location: Orange County, CA
Vehicle:2013 STi Dark Gray Metallic |
Good Work Nameless - this thread reminds me of Buschur Racing when he got the 2006 WRX and started making his TBE for that car - The power I got from his products were awesome in my WRX and have been looking for another shop like them for the last year or so since I got another Subaru.
Nameless - when you get your vendor status and dyno figures I am sure this will help put yourself on the map. "if you post them they will come" Let me know when you have a DP and the cost. I could be interested in doing this earlier than expected. Thanks |
02-15-2011, 07:45 PM | #117 | |
Scooby Newbie
Member Sales Rating: (0)
Member#: 15553
Join Date: Feb 2002
Chapter/Region:
TXIC
Location: Austin, Texas
Vehicle:'19 Shelby GT350 Tesla MYP/22 Ram 2500 LL |
Quote:
|
|
02-15-2011, 08:29 PM | #118 | |
Scooby Newbie
Member Sales Rating: (0)
Member#: 141927
Join Date: Feb 2007
|
Quote:
Lots going on here and still trying to squeeze development work in between the production builds. Jason |
|
02-16-2011, 01:37 AM | #119 | |
Scooby Specialist
Member Sales Rating: (9)
Member#: 161273
Join Date: Oct 2007
Chapter/Region:
TXIC
Location: austin tx
Vehicle:2008 forester xt silver |
Quote:
|
|
02-16-2011, 02:23 AM | #121 |
Scooby Newbie
Member Sales Rating: (0)
Member#: 141927
Join Date: Feb 2007
|
Hatch proto pics are on our FB Page: http://facebook.com/namelessperformance
Got the first proto finished, have a second to build tomorrow and then need to finalize the integrated cutout when we test fit on the car on Saturday. j |
02-16-2011, 03:29 PM | #122 |
Scooby Specialist
Member Sales Rating: (1)
Member#: 266384
Join Date: Dec 2010
Chapter/Region:
MWSOC
Location: Glenview/Chicago
Vehicle:2011 WRX Limited Spark Silver Metalic |
I guess, I dont understand the difference between the Straight Double Wall and Quad Round?
Do you have longer tips so you do see the welds in the back? like in the pic bellow where you see the welds [IMG]http://a5.sphotos.ak.fbcdn.net/hphot..._1958450_n.jpg[/IMG] I guess I want it to look like this in: Bare Finish, 10 degree slash, dual wall and flush with valance but longer tips. (non-staggered http://namelessperformance.com/wp-co...al%20Round.jpg Last edited by G_REX; 02-16-2011 at 03:37 PM. |
02-16-2011, 04:02 PM | #123 |
Scooby Guru
Member Sales Rating: (17)
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:2002 WRX - 750WHP 9.5s @ 150mph |
Dual wall is a flared tip, similar to the SPT exhaust or the OEM 2011 sedan exhaust.
Otherwise you just have a pipe that is cut off, like the COBB or Perrin (or many others). |
02-16-2011, 04:27 PM | #124 |
Scooby Newbie
Member Sales Rating: (0)
Member#: 141927
Join Date: Feb 2007
|
Straight double wall are slash cut 10 degrees and double wall. They fit flush.
The double round is a single wall rolled tip that looks best at halfway out. If anyone has any questions you can always email me at [email protected]. Thanks! Jason |
Thread Tools | |
Display Modes | |
|
|