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
 
PYSPEED
Post Reply
 
Thread Tools Search this Thread
      03-26-2012, 01:05 AM   #1
werly
First Lieutenant
Taiwan
10
Rep
330
Posts

 
Drives: 2011 MR E92 M3
Join Date: Aug 2010
Location: SoCal

iTrader: (1)

Send a message via MSN to werly
Catless x-pipe stinks badly :(

I have been running a catless & resonator-less xpipe for about a month.

First and the biggest issue that I have is the smell/emission.

Prior to installation I understand the smell will be prominent but how it is right now is beyond my tolerance level. I can live with some smells as long as it is not as bad like now. Also the carbon coming out from the rear is turning my exhaust tips yellow; I am afraid it is just a matter of time for the rear bumper becomes the same color so I am thinking about adding a set of 200 cpi cat at stock secondary location. I was told to add a set of 400 cpi cat. Which one should I go for?

Another issue is the sound, I am satisfy with the sound while cruising after the xpipe installed, but cold starting the car in my neighborhood becomes my fear. I have yet to receive any verbal complain but the car after the xpipe never fails to receive looks from them when I drive by and I am sure those looks are barely friendly...

To solve cold start issue I thought about deleting my secondary air pump to restrain the airflow, but since I am adding a set of cat it should be wise to keep the air pump for cats to work properly?

If only I can find a solution that reduces the smell completely while only kills the cold start noise but still retaining the sound while driving. But I know there is trade offs.

As for now I am leaning more towards adding a set of 200 cpi cats and see how it goes for smell and cold start sound. Any advice is welcomed
Appreciate 0
      03-26-2012, 01:28 AM   #2
Krozi
Colonel
Krozi's Avatar
United_States
49
Rep
2,713
Posts

 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

iTrader: (22)

Don't mess with the secondary. Just get the 200cell cats like you said, and maybe look into a tune to turn off the CEL and get rid of the cold start.
__________________

2008 E92 ///M3 Alpine White//Fox Red//6MT//
Florida Bimmer - Join us on FaceBook!
Appreciate 0
      03-26-2012, 01:31 AM   #3
tibra1
Banned
No_Country
75
Rep
6,775
Posts

 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

iTrader: (4)

Im sorry but what did you expect?,..any catless setup is going to have a bad smell..its all about if you are willing to tolerate it

And on this platform makes absolutely no sense..have been catless before myself..mostly on turbo applications where the power gains are substantial..not on my M3..not worth it imo
Appreciate 0
      03-26-2012, 01:44 AM   #4
werly
First Lieutenant
Taiwan
10
Rep
330
Posts

 
Drives: 2011 MR E92 M3
Join Date: Aug 2010
Location: SoCal

iTrader: (1)

Send a message via MSN to werly
Quote:
Originally Posted by Krozi View Post
Don't mess with the secondary. Just get the 200cell cats like you said, and maybe look into a tune to turn off the CEL and get rid of the cold start.
By saying don't mess with the secondary do you mean don't put 200 cell cat there but at the primary location instead?

I thought about getting a tune because I know it kills the cold start cycle and also reduces the smell a bit, but I doubt the smell will improve much by just a tune.
Appreciate 0
      03-26-2012, 07:00 AM   #5
Krozi
Colonel
Krozi's Avatar
United_States
49
Rep
2,713
Posts

 
Drives: 2008 E92 ///M3 Alpine White
Join Date: Oct 2009
Location: SoFla - Bonita Springs

iTrader: (22)

Quote:
Originally Posted by werly View Post
By saying don't mess with the secondary do you mean don't put 200 cell cat there but at the primary location instead?

I thought about getting a tune because I know it kills the cold start cycle and also reduces the smell a bit, but I doubt the smell will improve much by just a tune.
I mean secondary air pump

It took me a bit to get used to the smell also...but after a while it didn't bother me much. Just throw some 200cell cats in there and you'll like it!
__________________

2008 E92 ///M3 Alpine White//Fox Red//6MT//
Florida Bimmer - Join us on FaceBook!
Appreciate 0
      03-26-2012, 10:09 AM   #6
aus
Major General
118
Rep
7,420
Posts

 
Drives: Odysse
Join Date: Jul 2005
Location: Seal Beach, CA

iTrader: (5)

200-300cpi cats should be ok. I'm thinking of adding another set of 100cpi cats to my Akra X-pipe because it still smells.
__________________
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
Appreciate 0
      03-26-2012, 10:14 AM   #7
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
89
Rep
5,331
Posts

 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
I recommmend running 200 cel cat and a resonator...

200 cat is not bad to be honest i can barely smell mine... only on start up but barely... and if you decide to put one on make it like the AKRA set up...

now a no cat xpipe it gives me a headache... so
Appreciate 0
      03-26-2012, 10:28 AM   #8
werly
First Lieutenant
Taiwan
10
Rep
330
Posts

 
Drives: 2011 MR E92 M3
Join Date: Aug 2010
Location: SoCal

iTrader: (1)

Send a message via MSN to werly
The smell is actually just a bit over my limit, but the carbon coming out from the pipe really gets on my nerve. I want to get it fixed before my rear bumper turn yellow
Appreciate 0
      03-26-2012, 10:45 AM   #9
Rekrul
Captain
Rekrul's Avatar
20
Rep
799
Posts

 
Drives: Space Gray e92 M3
Join Date: Aug 2011
Location: Purgatory

iTrader: (1)

Eh.. its really not bad. I feel like there are a lot of sensitive boys on this forum. The power is substantial.
Appreciate 0
      03-26-2012, 10:46 AM   #10
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
89
Rep
5,331
Posts

 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
Quote:
Originally Posted by Rekrul View Post
Eh.. its really not bad. I feel like there are a lot of sensitive boys on this forum. The power is substantial.
really? ... it smells so bad sensitive i donw know... ... yea power is there but the torque really sucks so bad at low RPM... cant wait to put my 200 cel cat on and a resonator...
Appreciate 0
      03-26-2012, 12:17 PM   #11
aus
Major General
118
Rep
7,420
Posts

 
Drives: Odysse
Join Date: Jul 2005
Location: Seal Beach, CA

iTrader: (5)

Quote:
Originally Posted by Sean05 View Post
really? ... it smells so bad sensitive i donw know... ... yea power is there but the torque really sucks so bad at low RPM... cant wait to put my 200 cel cat on and a resonator...
Agreed. Maybe I'm just old but I hate driving behind a ricer car and smelling the car.

.
__________________
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
Appreciate 0
      03-26-2012, 12:36 PM   #12
Rekrul
Captain
Rekrul's Avatar
20
Rep
799
Posts

 
Drives: Space Gray e92 M3
Join Date: Aug 2011
Location: Purgatory

iTrader: (1)

Quote:
Originally Posted by Sean05 View Post
really? ... it smells so bad sensitive i donw know... ... yea power is there but the torque really sucks so bad at low RPM... cant wait to put my 200 cel cat on and a resonator...
Eh.. I dont sit behind my car so I dont care lol. I always loved smelling the cars at the track.. I like the smell when I start it up in the garage. As for the torque.. I don't think the loss is there and if it is its not substantial. I do know that my car is more apt to spin its tires though from 2500+ on. MY brother noted the same thing after driving it. Keep in mind, I have DCT too. So I can control my power band a bit better than say a 6spd. I am never under 2000 rpms.
Appreciate 0
      03-26-2012, 12:58 PM   #13
L4ces
Captain
L4ces's Avatar
United_States
8
Rep
705
Posts

 
Drives: 2008 E92 M3 Alpine White
Join Date: Aug 2010
Location: Nj

iTrader: (0)

Garage List
2008 M3  [0.00]
Quote:
Originally Posted by Rekrul
Quote:
Originally Posted by Sean05 View Post
really? ... it smells so bad sensitive i donw know... ... yea power is there but the torque really sucks so bad at low RPM... cant wait to put my 200 cel cat on and a resonator...
Eh.. I dont sit behind my car so I dont care lol. I always loved smelling the cars at the track.. I like the smell when I start it up in the garage. As for the torque.. I don't think the loss is there and if it is its not substantial. I do know that my car is more apt to spin its tires though from 2500+ on. MY brother noted the same thing after driving it. Keep in mind, I have DCT too. So I can control my power band a bit better than say a 6spd. I am never under 2000 rpms.
It is a price to pay when going catless. I tried it too. But it was only after I drove behind mine did I begin to feel effd up. With that said, I'd do it again if HFCs killed the smell. My car ran extremely rich which may not be the difference. Also, my rear bumper and truck gathered soot and little yellow spots. That may not happen to all, I dunno.
Appreciate 0
      03-26-2012, 01:38 PM   #14
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
89
Rep
5,331
Posts

 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
Quote:
Originally Posted by aus View Post
Agreed. Maybe I'm just old but I hate driving behind a ricer car and smelling the car.

.
im with you bro... it smells so bad im about to take the xpipe off... but ill wait a couple weeks...

yea maybe im old as well...
Appreciate 0
      03-26-2012, 01:40 PM   #15
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
89
Rep
5,331
Posts

 
Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
Quote:
Originally Posted by SehrSchnell View Post
Tiny yellow spots have nothing to do with being catless.
care to share...

being catless gets your bumper turn into yello well spots of yellow "carbon" anyways... then it turns dark yellow if you dont clean it up...
Appreciate 0
      03-26-2012, 07:34 PM   #16
tibra1
Banned
No_Country
75
Rep
6,775
Posts

 
Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

iTrader: (4)

Either way over time some kind of discoloring will occur..cost of doing business...thats why catless setups on turbos are better..its a cleaner exhaust emission than an NA..even still it would also discolor the bumper over time
Appreciate 0
      03-26-2012, 07:47 PM   #17
L4ces
Captain
L4ces's Avatar
United_States
8
Rep
705
Posts

 
Drives: 2008 E92 M3 Alpine White
Join Date: Aug 2010
Location: Nj

iTrader: (0)

Garage List
2008 M3  [0.00]
Perhaps more frequent waxing and extra coats of wax will prevent discoloration. It will probably slow down the process. That is what I started doing when I had the xpipes on. Just stating the obvious.
Appreciate 0
      03-26-2012, 08:11 PM   #18
Rekrul
Captain
Rekrul's Avatar
20
Rep
799
Posts

 
Drives: Space Gray e92 M3
Join Date: Aug 2011
Location: Purgatory

iTrader: (1)

I was my car regularly. No spots or deposition. I also don't drive like a bat out of hell everywhere. 18.4 MPG mixed driving.
Appreciate 0
      03-26-2012, 08:13 PM   #19
1MOREMOD
2014 Track Days - 11|Ridge 1:52:24|Pacific 1:35:72
1MOREMOD's Avatar
United_States
173
Rep
12,996
Posts

 
Drives: Race car->
Join Date: Mar 2009
Location: check your mirrors

iTrader: (5)

just stand in your garage with it running. you will learn to love the smell.
__________________

02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|
Appreciate 0
      03-26-2012, 08:41 PM   #20
Rekrul
Captain
Rekrul's Avatar
20
Rep
799
Posts

 
Drives: Space Gray e92 M3
Join Date: Aug 2011
Location: Purgatory

iTrader: (1)

Quote:
Originally Posted by chriszeh View Post
just stand in your garage with it running. you will learn to love the smell.
Amen.
Appreciate 0
      03-26-2012, 08:44 PM   #21
joshparzi
Private
United_States
0
Rep
64
Posts

 
Drives: E90 M3
Join Date: Aug 2011
Location: 818 LA

iTrader: (2)

this explains why my trunk is yellow
Appreciate 0
      03-26-2012, 08:44 PM   #22
///M Ryder
Grown Azz Man
///M Ryder's Avatar
United_States
49
Rep
2,573
Posts

 
Drives: 2011.5 Dinan ///M3
Join Date: Dec 2010
Location: Sugar Land

iTrader: (5)

The smell is part of the experience......learn to live with it...............Phil
__________________
2011.5 E92 Dinan///M3: SSII DCT- Comp, Prem 2, and Conv Pkg, Heated Seats, Enhanced Prem Sound, Edition Grills/Gills, M Performance Steering Wheel, Carbon Fiber Performance Spoiler, BMW Pedals, Dinan Exhaust, Dinan X-Pipe, Dinan Carbon Fiber Intake, Dinan Software Tune, Dinan DCT Tune, Dinan Pulley Kit, Dinan CH-R Wheels, Dinan Carbon Fiber Strut Tower Braces, Arkym Lip, IND M5 Mirror Caps, Carbon Reflectors, Lux H8 V3, Brembo 365mm BBK
Appreciate 0
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 07:41 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