BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
GetBMWParts
Post Reply
 
Thread Tools Search this Thread
      11-08-2009, 08:02 PM   #1
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

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:





Periokid is offline  
0
Reply With Quote
      11-08-2009, 08:06 PM   #2
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

More Pics:







Periokid is offline  
0
Reply With Quote
      11-08-2009, 08:08 PM   #3
ahtim
Akrapovic HK
 
Drives: mostly NA, sometimes turbo
Join Date: Oct 2008
Location: Hong Kong,

Posts: 219
iTrader: (0)

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!!!!!!
ahtim is offline  
0
Reply With Quote
      11-08-2009, 08:12 PM   #4
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

Quote:
Originally Posted by ahtim View Post
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!!!!!!
I don't know about doing the whole straight pipe thing but the idea here is to still have the use of the Hemholtz Chambers to combat drone.

See the diagram: http://www.m3post.com/forums/showpos...4&postcount=19
Periokid is offline  
0
Reply With Quote
      11-08-2009, 08:15 PM   #5
Krozi
Deutsche Jung aus Kölle
 
Krozi's Avatar
 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

Posts: 2,702
iTrader: (21)

There is a dead animal in your exhaust! :P

Good job!
Krozi is offline   Germany
0
Reply With Quote
      11-08-2009, 08:17 PM   #6
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

Quote:
Originally Posted by Krozi View Post
There is a dead animal in your exhaust! :P

Good job!
Yeah, my wife was like, "WTF is that!"
Periokid is offline  
0
Reply With Quote
      11-08-2009, 08:30 PM   #7
elp_jc
Brigadier General
 
Drives: .
Join Date: May 2008
Location: .

Posts: 4,910
iTrader: (0)

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 .
elp_jc is offline   United_States
0
Reply With Quote
      11-08-2009, 08:41 PM   #8
J08M3
Major General
 
J08M3's Avatar
 
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

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.
__________________
J08M3 is offline   United_States
0
Reply With Quote
      11-08-2009, 08:52 PM   #9
Krozi
Deutsche Jung aus Kölle
 
Krozi's Avatar
 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

Posts: 2,702
iTrader: (21)

Quote:
Originally Posted by J08M3 View Post
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.
+1
Krozi is offline   Germany
0
Reply With Quote
      11-08-2009, 09:13 PM   #10
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

Quote:
Originally Posted by J08M3 View Post
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.
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.
Periokid is offline  
0
Reply With Quote
      11-08-2009, 09:14 PM   #11
J08M3
Major General
 
J08M3's Avatar
 
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

Quote:
Originally Posted by Periokid View Post
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.
Yea, but all the absorbing material just got taken out of the chamber. Subw00fer left his in there, that's why his works.
__________________
J08M3 is offline   United_States
0
Reply With Quote
      11-08-2009, 09:27 PM   #12
Periokid
Second Lieutenant
 
Periokid's Avatar
 
Drives: 2009 e93 M3 (gone and missed)
Join Date: Apr 2009
Location: LI, NY

Posts: 247
iTrader: (0)

Quote:
Originally Posted by J08M3 View Post
Yea, but all the absorbing material just got taken out of the chamber. Subw00fer left his in there, that's why his works.
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.
Periokid is offline  
0
Reply With Quote
      11-08-2009, 09:30 PM   #13
rsmamg
Flying First Class
 
Drives: M
Join Date: Sep 2008
Location: CA

Posts: 584
iTrader: (0)

Quote:
Originally Posted by Krozi View Post
There is a dead animal in your exhaust! :P

Good job!
rsmamg is offline   United_States
0
Reply With Quote
      11-08-2009, 09:36 PM   #14
Poppin Fresh
Colonel
 
Poppin Fresh's Avatar
 
Drives: With a sunroof and front plate
Join Date: May 2009
Location: Bergen County NJ

Posts: 2,128
iTrader: (0)

Jesus! Is that a poodle?!!
__________________
Poppin Fresh is offline   Philippines
0
Reply With Quote
      11-08-2009, 09:39 PM   #15
mastek
e36s54, F10M5, e70X5d
 
mastek's Avatar
 
Drives: slow
Join Date: Aug 2008
Location: Los Angeles, CA

Posts: 1,509
iTrader: (15)

Quote:
Originally Posted by Periokid View Post
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.
interesting .... keep us posted.
how long b4 video of unit on car?
mastek is offline   United_States
0
Reply With Quote
      11-08-2009, 10:24 PM   #16
elp_jc
Brigadier General
 
Drives: .
Join Date: May 2008
Location: .

Posts: 4,910
iTrader: (0)

Quote:
Originally Posted by J08M3 View Post
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.
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.
elp_jc is offline   United_States
0
Reply With Quote
      11-08-2009, 10:32 PM   #17
Poppin Fresh
Colonel
 
Poppin Fresh's Avatar
 
Drives: With a sunroof and front plate
Join Date: May 2009
Location: Bergen County NJ

Posts: 2,128
iTrader: (0)

Please post vids of the results...hope it all goes well.
__________________
Poppin Fresh is offline   Philippines
0
Reply With Quote
      11-08-2009, 11:26 PM   #18
MrHarris
yodog
 
MrHarris's Avatar
 
Drives: '86 Corolla
Join Date: Jun 2007
Location: Diamond Bar, Ca

Posts: 5,035
iTrader: (5)

Garage List
2009 BMW  [5.00]
Send a message via AIM to MrHarris
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
MrHarris is offline   United_States
0
Reply With Quote
      11-08-2009, 11:55 PM   #19
H Bomb
Lieutenant Colonel
 
Drives: 08 M3
Join Date: Jul 2007
Location: FL to NY

Posts: 1,679
iTrader: (4)

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

Quote:
Originally Posted by ahtim View Post
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!!!!!!
__________________
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
H Bomb is offline  
0
Reply With Quote
      11-08-2009, 11:57 PM   #20
H Bomb
Lieutenant Colonel
 
Drives: 08 M3
Join Date: Jul 2007
Location: FL to NY

Posts: 1,679
iTrader: (4)

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
H Bomb is offline  
0
Reply With Quote
      11-09-2009, 12:18 AM   #21
Subw00er
Bates '08 Interlagos Launch
 
Subw00er's Avatar
 
Drives: 08e92M, 03e46M
Join Date: Nov 2005
Location: NY

Posts: 1,202
iTrader: (2)

Send a message via AIM to Subw00er
Cool, I am inspirational!

Quote:
Originally Posted by J08M3 View Post
Yea, but all the absorbing material just got taken out of the chamber. Subw00fer left his in there, that's why his works.
I suppose it is possible that the muffled sections do kill some drone as well, even when my valves are open, but I guess we wont know till he buttons it up and lets us know! Exhaust gasses, and thus sound waves, do flow through the stock pipes when my valves are open. Because I "T"ed off of the oem pipe, it would seem that the path the sound and flow would want to take would be straight through. It will be interesting to see how this turns out.

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
Subw00er is offline   United_States
0
Reply With Quote
      11-09-2009, 12:47 AM   #22
montreal red
chris
 
montreal red's Avatar
 
Drives: White Boat
Join Date: Jun 2007
Location: Toronto

Posts: 12,118
iTrader: (31)

Send a message via MSN to montreal red
this should be a great project !
__________________

Current: 2013 F10 M5 & 2013 GLK350
997.1 GT3RS (gone)
2009 WRX STI (gone)
e92 M3 (gone)
montreal red is offline   Canada
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:49 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST