E90Post
 


Lux Angel Eyes
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Australia > Understanding the E92 335i exhaust system



Reply
 
Thread Tools Search this Thread
      12-17-2012, 01:53 AM   #1
JJH_335
Second Lieutenant
 
JJH_335's Avatar
 
Drives: BSM E92 335i manual
Join Date: Nov 2012
Location: Canberra, Australia

Posts: 209
iTrader: (0)

Understanding the E92 335i exhaust system

I am trying to understand the OEM exhaust system on the E92 335i in the hope it helps me decide on an aftermarket one for my car.

I plan on catless DPs and will retain the secondary cats section. I am wondering whether to replace the centre section/muffler together with the rear section; or just the rear section. The aim is to achieve the best performance gain, understanding that I am retaining the secondaries.

The diagram below shows the factory system, as I understand it for the E92, which has 4 separate sections. Going left to right are the sections from the front to rear of the car.



Am I correct in saying that item # 1 is the balance pipe between the left and right side of the system? Seems to me the BMW PE system is also set up this way.

Is there any other balance pipe in the system, perhaps in the centre section as part of the muffler, # 2 in the diagram?

How important is it to have a balance pipe in the system?

Thanks and cheers,
Jon
JJH_335 is offline   Australia
0
Reply With Quote
      12-17-2012, 02:09 AM   #2
pavo335
Banned
 
pavo335's Avatar
 
Drives: 3.5 wheeler
Join Date: Feb 2012
Location: sydney

Posts: 2,981
iTrader: (0)

Quote:
Originally Posted by JJH_335
I am trying to understand the OEM exhaust system on the E92 335i in the hope it helps me decide on an aftermarket one for my car.

I plan on catless DPs and will retain the secondary cats section. I am wondering whether to replace the centre section/muffler together with the rear section; or just the rear section. The aim is to achieve the best performance gain, understanding that I am retaining the secondaries.

The diagram below shows the factory system, as I understand it for the E92, which has 4 separate sections. Going left to right are the sections from the front to rear of the car.



Am I correct in saying that item # 1 is the balance pipe between the left and right side of the system? Seems to me the BMW PE system is also set up this way.

Is there any other balance pipe in the system, perhaps in the centre section as part of the muffler, # 2 in the diagram?

How important is it to have a balance pipe in the system?

Thanks and cheers,
Jon
What other mods do you have and are planning, there are lots of other mods that offer better value
pavo335 is offline  
0
Reply With Quote
      12-17-2012, 02:32 AM   #3
Zen
Lieutenant
 
Drives: E92 335i
Join Date: Nov 2008
Location: Sydney Aus

Posts: 586
iTrader: (0)

I had my PE installed at Advan this morning. [Nice chatting with you Peter, and big thanks to Chris and another guy in the shop (sorry didn't catch your name!) for installing it ]

I'm not too sure if this answer your question, but here is the stock exhaust image..



The balance pipe #1, for stock seems to be welded to and clamped for the PE. Yes they seem to have a similar setup, but the noise it generate is so much louder.
__________________
08' E92 335I
Black Sapphire Metallic | M-Sport | GT-CS 19" Matte Anthracite | BMW Perf. Exhaust | JB4 | AR Design Catless DP | R1 Concepts Cross-drilled & Slotted Rotors | aFe DCI | ER Chargepipe with Forge DV | ER FMIC
Zen is offline   Australia
0
Reply With Quote
      12-17-2012, 03:14 AM   #4
_ink
Captain
 
_ink's Avatar
 
Drives: 335i 09' DCT M-Sport
Join Date: May 2012
Location: Sydney, Australia

Posts: 906
iTrader: (0)

Quote:
Originally Posted by Zen View Post
I
The balance pipe #1, for stock seems to be welded to and clamped for the PE. Yes they seem to have a similar setup, but the noise it generate is so much louder.
The increased noise is due to the internal baffling that has been used in the PE.
_ink is offline   Australia
0
Reply With Quote
      12-17-2012, 03:17 AM   #5
_ink
Captain
 
_ink's Avatar
 
Drives: 335i 09' DCT M-Sport
Join Date: May 2012
Location: Sydney, Australia

Posts: 906
iTrader: (0)

Item 1 is the only balancer apparent in the stock system.

Most Aftermarket systems remove the mid muffler, however there would be no gains attributed to that.
_ink is offline   Australia
0
Reply With Quote
      12-17-2012, 05:48 AM   #6
DR-JEKL
Lieutenant Colonel
 
Drives: Space Grey 335i 6MT
Join Date: Jul 2012
Location: Newcastle Ozstraylia

Posts: 1,656
iTrader: (0)

From what research I have done a 'full' system only adds minimal hp (10-20HP at most) and is only mainly done for acoustics.

The 335i must be the only turbo car that I know of that isn't transformed with an aftermarket exhaust which must be why must of the big name co's just offer a rear section.

The best sounding N54 I have heard to date is ZUZU's 1M which has a meisterschaft straight pipe rear section, which kinda has me in two minds atm to purchase a cheap renntech full system or get a custom straight pipe fabricated... Something like the HPF setup:



The balance pipe which interconnects the two mufflers AFAIK is just a DB killer?:


Last edited by DR-JEKL; 12-17-2012 at 05:57 AM.
DR-JEKL is offline  
0
Reply With Quote
      12-17-2012, 07:30 AM   #7
sbce90
Me Boosta
 
sbce90's Avatar
 
Drives: 320i / MB C63 / VW up!
Join Date: Jan 2010
Location: Sydney, Australia

Posts: 5,453
iTrader: (3)

You're thinking too much.

catless dp + BMW PE = done
sbce90 is offline   Australia
0
Reply With Quote
      12-17-2012, 04:40 PM   #8
JJH_335
Second Lieutenant
 
JJH_335's Avatar
 
Drives: BSM E92 335i manual
Join Date: Nov 2012
Location: Canberra, Australia

Posts: 209
iTrader: (0)

Quote:
Originally Posted by sbce90 View Post
You're thinking too much.

catless dp + BMW PE = done
Ha! Yeah ... I think you may be right on that to some extent!

The question of balance pipes just had be stumped. It is usually important in a non-turbo car situation because, as I understand it, it is there to balance the exhaust gas pulses in a twin system. No idea if it is critical on a turbo car. The fact the OEM and BMW PE systems have it makes me think that is a yes. I am considering replacing the centre section muffler with an X-merge which will have a balance effect and possibly individual Supersprint rear boxes.

Or maybe just go with sbce90s suggestion of PE/DPs instead and be done with it!

Pavo335 - Only mod so far is a Cobb AP reflash, next will be AR DPs. Then considering charge pipe/DV, FMIC and then exhaust.
JJH_335 is offline   Australia
0
Reply With Quote
      12-17-2012, 06:54 PM   #9
Stuart@BMRAutowerkes
BimmerPost Supporting Vendor

 
Stuart@BMRAutowerkes's Avatar
 
Drives: a black car
Join Date: Sep 2010
Location: Sydney

Posts: 4,793
iTrader: (3)

Change the rear section of the exhaust.

Alan lets hear some sound clips of your car or bring it to the next meet so everyone can hear it in person
Stuart@BMRAutowerkes is offline  
0
Reply With Quote
      12-17-2012, 10:05 PM   #10
Gemballa1980
Second Lieutenant
 
Drives: 335i
Join Date: Jun 2012
Location: Canberra, Australia

Posts: 281
iTrader: (0)

Stupid question (or is it?) but wouldn't the balance pipe which interconnects the two mufflers on a standard exhaust be there for when the exhaust flap is closed on the LHS muffler - to help reroute the gasses?

Does the PE have a flap in the LHS muffler as well?
Gemballa1980 is offline  
0
Reply With Quote
      12-17-2012, 10:22 PM   #11
DR-JEKL
Lieutenant Colonel
 
Drives: Space Grey 335i 6MT
Join Date: Jul 2012
Location: Newcastle Ozstraylia

Posts: 1,656
iTrader: (0)

See those series of small holes in the internal balance pipe, that is to dampen certain unwanted frequencies from being heard inside the cabin.

You will find in a PE that there will still be a balance pipe yet it has no holes and less packing in the muffler section (steel wool type packing you may have seen in some exhausts) which means > DB.
DR-JEKL is offline  
0
Reply With Quote
      12-17-2012, 10:23 PM   #12
_ink
Captain
 
_ink's Avatar
 
Drives: 335i 09' DCT M-Sport
Join Date: May 2012
Location: Sydney, Australia

Posts: 906
iTrader: (0)

Quote:
Originally Posted by Gemballa1980
Stupid question (or is it?) but wouldn't the balance pipe which interconnects the two mufflers on a standard exhaust be there for when the exhaust flap is closed on the LHS muffler - to help reroute the gasses?

Does the PE have a flap in the LHS muffler as well?
The PE eliminates the flap. I believe the balancer pipe helps with both harmonics and the flow.
__________________
... Check out the garage
_ink is offline   Australia
0
Reply With Quote
      12-17-2012, 10:41 PM   #13
eriktufa
3r1k
 
eriktufa's Avatar
 
Drives: 2008 MY08 BMW E92 335i
Join Date: Jan 2012
Location: Perth

Posts: 307
iTrader: (0)

In nutshell, you won't get much gain from exhaust mod except if you remove that secondary cat?

Btw, I am one of XXX people that fail to feel HP gain from adding DP.

Exhaust mod = waste of money? thoughts?
__________________
12.836 @ 109.75mph (Cobb - Accessport & VRSF DP)
eriktufa is offline   Australia
0
Reply With Quote
      12-17-2012, 10:49 PM   #14
Zen
Lieutenant
 
Drives: E92 335i
Join Date: Nov 2008
Location: Sydney Aus

Posts: 586
iTrader: (0)

Quote:
Originally Posted by bmroxm5 View Post
Change the rear section of the exhaust.

Alan lets hear some sound clips of your car or bring it to the next meet so everyone can hear it in person
Sure, I will get some clips later in the week.. Started it up this morning and god damn it is loud when its cold..
__________________
08' E92 335I
Black Sapphire Metallic | M-Sport | GT-CS 19" Matte Anthracite | BMW Perf. Exhaust | JB4 | AR Design Catless DP | R1 Concepts Cross-drilled & Slotted Rotors | aFe DCI | ER Chargepipe with Forge DV | ER FMIC
Zen is offline   Australia
0
Reply With Quote
      12-18-2012, 01:24 AM   #15
JJH_335
Second Lieutenant
 
JJH_335's Avatar
 
Drives: BSM E92 335i manual
Join Date: Nov 2012
Location: Canberra, Australia

Posts: 209
iTrader: (0)

Quote:
Originally Posted by eriktufa View Post
In nutshell, you won't get much gain from exhaust mod except if you remove that secondary cat?
I gathered that, except for DPs that is. The change of the rear section(s) would be mostly for the acoustics/sound. I guess the question is to what degree it gets 'pleasantly loud' before getting to 'PITA loud' on the highway. Of course we will all have our individual preferences!!

A good quality clip would be great at this point.
JJH_335 is offline   Australia
0
Reply With Quote
      12-18-2012, 01:58 AM   #16
Gemballa1980
Second Lieutenant
 
Drives: 335i
Join Date: Jun 2012
Location: Canberra, Australia

Posts: 281
iTrader: (0)

I was looking at a bmw PE as well, as all others fall into the 'PITA' loud group for me; except maybe the Remus Sport, although I've only heard sounds clips of it. Then I got the 3" AR's (catless) and am more than happy with the note. Sounds good with windows down, and can hardly hear it when they're up. Since you're in Canberra, if you want a listen - hit me up!

Meanwhile, TNT just turned up at my door with a shiny new Helix FMIC and ER CP. Goes in tomorrow!
Gemballa1980 is offline  
0
Reply With Quote
      12-23-2012, 09:35 PM   #17
blk335msport
New Member
 
Drives: 335 M sport
Join Date: Dec 2012
Location: Australia

Posts: 20
iTrader: (0)

What's the going dealer rate for a BMW PE for the e92?
blk335msport is offline  
0
Reply With Quote
      12-23-2012, 10:19 PM   #18
DR-JEKL
Lieutenant Colonel
 
Drives: Space Grey 335i 6MT
Join Date: Jul 2012
Location: Newcastle Ozstraylia

Posts: 1,656
iTrader: (0)

Quote:
Originally Posted by blk335msport View Post
What's the going dealer rate for a BMW PE for the e92?
I know I have been quoted $1300 delivered (2 weeks DHL from Germany)
DR-JEKL is offline  
0
Reply With Quote
      12-24-2012, 02:54 AM   #19
Zen
Lieutenant
 
Drives: E92 335i
Join Date: Nov 2008
Location: Sydney Aus

Posts: 586
iTrader: (0)

Heres a clip I have made of my performance exhaust.

Sorry for the shitty video editing..

Enjoy!
__________________
08' E92 335I
Black Sapphire Metallic | M-Sport | GT-CS 19" Matte Anthracite | BMW Perf. Exhaust | JB4 | AR Design Catless DP | R1 Concepts Cross-drilled & Slotted Rotors | aFe DCI | ER Chargepipe with Forge DV | ER FMIC
Zen is offline   Australia
0
Reply With Quote
      12-26-2012, 04:32 PM   #20
DR-JEKL
Lieutenant Colonel
 
Drives: Space Grey 335i 6MT
Join Date: Jul 2012
Location: Newcastle Ozstraylia

Posts: 1,656
iTrader: (0)

Sounds great congratulations
DR-JEKL is offline  
0
Reply With Quote
      02-26-2013, 01:53 AM   #21
JJH_335
Second Lieutenant
 
JJH_335's Avatar
 
Drives: BSM E92 335i manual
Join Date: Nov 2012
Location: Canberra, Australia

Posts: 209
iTrader: (0)

I thought I would post this up just in case someone was ever interested.

I undetstand this is the factory exhaust from an E92 335i - downpipes back, lying upside down on the ground. I thought it surprising that the centre section in particular looks to be rather messy with sharp bends and crushed pipes (especially on the RHS, left in photo). I guess to package the system around the under floor area but maybe at the cost of gas flow?

JJH_335 is offline   Australia
0
Reply With Quote
      02-26-2013, 03:19 AM   #22
kaitan
Major
 
kaitan's Avatar
 
Drives: Bus 11 AKA walking
Join Date: Nov 2011
Location: sydney, australia

Posts: 1,317
iTrader: (1)

Quote:
Originally Posted by Zen View Post
Heres a clip I have made of my performance exhaust.

Sorry for the shitty video editing..

Enjoy!
Do you feel any power gain?
kaitan is offline  
0
Reply With Quote
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 02:19 AM.




e90post
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