|
|
11-08-2009, 07:02 PM | #1 |
First Lieutenant
61
Rep 335
Posts |
M3 exhaust modification
Subw00fer has inspired me.
His phenomenal exhaust system has motivated me to try a mod of my own. My idea was post #197 on this thread located here: http://www.m3post.com/forums/showthread.php?t=253661 Basically I wanted the sound without the actuators. Not nearly as cool as the Bates Prototype Valvetronic Exhaust, but something I want to try. The idea is to open the absorption chambers, take out the absorption material and seal the perforated pipes. I am not sure what to expect but I am hoping to get some sound similar to the Bates Prototype. My first step was to obtain a used unit. Thanks to Space Ghost, that step was completed today with a deal in a mall parking lot which quickly brought over security thinking we were doing a drug deal! Next I cut open the chambers and pulled out a mile of material. It was almost comical. It just kept coming out and was endless. Then I removed the steel wool like material from each side covering a small section of two pipes. Now I have clean chambers and exposed perforated piping. My plan is to wrap the pipes with header wrap and seal the chambers. Here are some pics: Last edited by Periokid; 01-26-2015 at 10:48 AM.. |
11-08-2009, 07:08 PM | #3 |
Akrapovic HK
73
Rep 274
Posts |
this is some serious good shit!!!!
has anyone ever though of doing a full straight pipe, from the header to the rear tip running a straight titian pipe, without any muffler, it must be sick!!!!!! |
Appreciate
0
|
11-08-2009, 07:12 PM | #4 | |
First Lieutenant
61
Rep 335
Posts |
Quote:
See the diagram: http://www.m3post.com/forums/showpos...4&postcount=19 |
|
Appreciate
0
|
11-08-2009, 07:30 PM | #7 |
Major General
265
Rep 5,018
Posts |
Great project. I'd just close it like that man; might give you a deeper sound without all that material, no? If you don't like it, then wrap the perforated sections. Just an idea. Please keep us posted .
|
Appreciate
0
|
11-08-2009, 07:41 PM | #8 |
Major General
293
Rep 6,007
Posts |
Cool idea... although I imagine it will probably drone quite a bit. All that "eliminated" drone sound is absorbed by the material you just removed.
__________________
|
Appreciate
0
|
11-08-2009, 07:52 PM | #9 |
Colonel
169
Rep 2,736
Posts
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs
|
|
Appreciate
0
|
11-08-2009, 08:13 PM | #10 |
First Lieutenant
61
Rep 335
Posts |
According to Subw00fer, the drone is addressed by the Hemholtz chambers. His bypass system basically sends the exhaust right out, just past the Hemholtz chambers and he has no drone. We shall see.
|
Appreciate
0
|
11-08-2009, 08:14 PM | #11 |
Major General
293
Rep 6,007
Posts |
Yea, but all the absorbing material just got taken out of the chamber. Subw00fer left his in there, that's why his works.
__________________
|
Appreciate
0
|
11-08-2009, 08:27 PM | #12 |
First Lieutenant
61
Rep 335
Posts |
The material I removed was from the absorption chambers, not the Hemholtz chambers. The material is removed so I can wrap the perforated pipes. I can still put the material back in if I had to but it shouldn't matter since the Helholtz chambers are still sealed.
|
Appreciate
0
|
11-08-2009, 08:39 PM | #15 | |
e36s54, e70x5d
155
Rep 1,723
Posts |
Quote:
how long b4 video of unit on car? |
|
Appreciate
0
|
11-08-2009, 09:24 PM | #16 |
Major General
265
Rep 5,018
Posts |
As Periokid said, the drone (Helmholtz) chambers are at the ends; that's why I suggested just buttoning it up. The removed material is just to quiet the exhaust. I say it should sound great just like that, but it's up to you to try it or not. Take care.
|
Appreciate
0
|
11-08-2009, 10:26 PM | #18 |
yodog
201
Rep 5,025
Posts |
Pretty cool. Does the stock exhaust have a lot of near 90 degree bends inside it?
__________________
2009 E92 M3 | Alpine White | Black Extended | Advan RS | Turner Test Pipes | Dinan Axle-Back | OETuning | Eibach Springs | UUC SSK | VRS Front Lip | VRS Type I Diffuser | Matte Black | RPi Scoops | MS Filter | Yokohama AD08 | F1 Pinnacle Special Thanks: Gintani | OETuning | eAs |
Appreciate
0
|
11-08-2009, 10:55 PM | #19 |
Lieutenant Colonel
68
Rep 1,676
Posts |
i know of one on an M6. it is sick nasty. i was hoping they would do it for the M3 but not yet just straight with resonators. with that V10 it sounded insane in the upper rpm's
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
Appreciate
0
|
11-08-2009, 10:57 PM | #20 |
Lieutenant Colonel
68
Rep 1,676
Posts |
any sound clips??
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
Appreciate
0
|
11-08-2009, 11:18 PM | #21 | |
Bates '08 Interlagos Launch
126
Rep 1,230
Posts |
Cool, I am inspirational!
Quote:
Header wrap seems to be a good idea btw, but is that stuff air tight? Also, I'm not sure its designed to resist an exhaust "leak" like you'll be imitating. I was thinking that a layer of some kind of thick metal tape would be good - maybe even under the wrap. I think they make high temp stuff - try mcmastercarr.com.
__________________
Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/
DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740 |
|
Appreciate
0
|
11-08-2009, 11:47 PM | #22 |
chris
290
Rep 12,144
Posts |
this should be a great project !
__________________
Current: 2013 F10 M5 & 2016 Mini JCW 2013 GLK350 (gone), 997.1 GT3RS (gone), 2009 WRX STI (gone), e92 M3 (gone) |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|