E90Post
 


GTB Performance
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Mid(secondary) cats vs Resonators



Reply
 
Thread Tools Search this Thread
      04-22-2013, 03:04 AM   #1
Sick335
Captain
 
Drives: 335i
Join Date: Oct 2011
Location: Tarzana, CA

Posts: 937
iTrader: (0)

Mid(secondary) cats vs Resonators

Hello fellas,

Just a few quick questions.
How do mid resonators stack up against stock mid(secondary) cats?
Do resonators quite the car down more? less?
Is the performance better with resonators or cats?
Will resonators remove all the drone like the cats do?
Is it worth the hastle performance wise to switch to resonators?

Pitch in.

Thanks
__________________

JB4 G5 ISO+BMS Flash+RB Turbos+Meth=
Sick335 is offline   United_States
0
Reply With Quote
      04-22-2013, 09:51 AM   #2
triggz
Banned
 
Drives: E92 335i
Join Date: Jun 2010
Location: Toronto

Posts: 1,225
iTrader: (2)

It doesn't reduce drone much but it does remove rasp.

You will feel an improvement in throttle response and your butt dyno may improve slightly.

The loudness wont change much. Slightly deeper down low.

Less restrictions is always good for turbos
triggz is offline   Canada
0
Reply With Quote
      04-22-2013, 10:27 AM   #3
135Pats
Can't decide....
 
135Pats's Avatar
 
Drives: 135i
Join Date: May 2012
Location: Maryland

Posts: 5,373
iTrader: (1)

Quote:
Originally Posted by Sick335 View Post
Hello fellas,

Just a few quick questions.
How do mid resonators stack up against stock mid(secondary) cats?
Do resonators quite the car down more? less?
Is the performance better with resonators or cats?
Will resonators remove all the drone like the cats do?
Is it worth the hastle performance wise to switch to resonators?

Pitch in.

Thanks
Please keep in mind that I'm talking about my car, so there are sleight differences, but the parts involved are similar and the overall tone is going to be very similar coming from the identical motor. I swapped from the OE N54 mids to Berk resonated/catless mids, I observed the following. Close to no rasp until you clear 4-5K revs under heavy load, personally I'd welcome a bit more rasp, but that's just me. It cut down on drone a good bit, esp. in 6th. The Berks didn't add much volume at all, but refined the tone, more aggressive and less drony/boomy. I noticed better throttle tip in response, but I have no dyno sheet to confirm. IIRC Berk claimed 10 or so whp switching out the midpipes, that sounds optimistic but I'd believe +10whp in conjunction with a better flowing axle back (E8x mufflers are quite restrictive, even that far downstream). I wouldn't do this for power, but IMO resonators are a worthy addition on a car with an aggressive exhaust setup. They mellow out the rasp and drone, while making the overall tone more aggressive and refined. Sometimes I think about going full retard with GThaus straight piped mids, but overall i'm very happy with the resonated Berks. My exhaust is in sig below, obviously my experiences are subjective.
Quote:
Originally Posted by triggz View Post
It doesn't reduce drone much but it does remove rasp.

You will feel an improvement in throttle response and your butt dyno may improve slightly.

The loudness wont change much. Slightly deeper down low.

Less restrictions is always good for turbos
Id agree with this, generally.
__________________
E88 FBO N54 Alpinweiss/Coral Red/Meisterschaft Race/Berk Resonated/Macht Schnell 3"/ER CP/Synapse/VRSF FMIC/FFTEC LPFP/HFS-4 DO Stainless Lines/BMS DCI/BMS Thermostat Delete/Rob Beck PCV Valve + Cap/BMS OCC/PTF E50/ST Coilovers/M3 Front Control Arms + Tension Rods/M3 Subframe Bushings/M3 FSB/DINAN Camber Plates/Apex ARC-8/Project Kics/Macht Schnell Studs/VAC Hubs/Rogue Transmission Mounts/Alpina TCU Flash/Icarbon/Kerscher/BMW Performance
135Pats is online now   United_States
0
Reply With Quote
      04-22-2013, 10:37 AM   #4
Sick335
Captain
 
Drives: 335i
Join Date: Oct 2011
Location: Tarzana, CA

Posts: 937
iTrader: (0)

Quote:
Originally Posted by 135Pats View Post
Please keep in mind that I'm talking about my car, so there are sleight differences, but the parts involved are similar and the overall tone is going to be very similar coming from the identical motor. I swapped from the OE N54 mids to Berk resonated/catless mids, I observed the following. Close to no rasp until you clear 4-5K revs under heavy load, personally I'd welcome a bit more rasp, but that's just me. It cut down on drone a good bit, esp. in 6th. The Berks didn't add much volume at all, but refined the tone, more aggressive and less drony/boomy. I noticed better throttle tip in response, but I have no dyno sheet to confirm. IIRC Berk claimed 10 or so whp switching out the midpipes, that sounds optimistic but I'd believe +10whp in conjunction with a better flowing axle back (E8x mufflers are quite restrictive, even that far downstream). I wouldn't do this for power, but IMO resonators are a worthy addition on a car with an aggressive exhaust setup. They mellow out the rasp and drone, while making the overall tone more aggressive and refined. Sometimes I think about going full retard with GThaus straight piped mids, but overall i'm very happy with the resonated Berks. My exhaust is in sig below, obviously my experiences are subjective.


Id agree with this, generally.
Berk doesnt seem to have any for 335s. Gonna do some research and hunt a pair down. At my power level i probably am missing abour 10-15whp with my mid cats
__________________

JB4 G5 ISO+BMS Flash+RB Turbos+Meth=
Sick335 is offline   United_States
0
Reply With Quote
      04-22-2013, 11:22 AM   #5
Sick335
Captain
 
Drives: 335i
Join Date: Oct 2011
Location: Tarzana, CA

Posts: 937
iTrader: (0)

Has anyone installed the Vibrant Resonators found on HPF website?
__________________

JB4 G5 ISO+BMS Flash+RB Turbos+Meth=
Sick335 is offline   United_States
0
Reply With Quote
      04-22-2013, 12:42 PM   #6
triggz
Banned
 
Drives: E92 335i
Join Date: Jun 2010
Location: Toronto

Posts: 1,225
iTrader: (2)

Quote:
Originally Posted by Sick335 View Post
Has anyone installed the Vibrant Resonators found on HPF website?
The vibrant resonators you need are #1792.

Yes I have them.
triggz is offline   Canada
0
Reply With Quote
      04-22-2013, 01:20 PM   #7
Marcadelic
Instagram: @Marcadelic
 
Marcadelic's Avatar
 
Drives: e92 335i
Join Date: Jan 2010
Location: Orlando/Tampa

Posts: 2,310
iTrader: (3)

Send a message via Skype™ to Marcadelic
Quote:
Originally Posted by Sick335 View Post
Has anyone installed the Vibrant Resonators found on HPF website?
a lot of people are running those, i'm about to get a pair too
__________________
2010 335i FBO | Instagram: Marcadelic
Marcadelic is offline   United_States
0
Reply With Quote
      04-22-2013, 01:48 PM   #8
SfValley335i
Colonel
 
Drives: Current:135i Sold:335i sedan
Join Date: Mar 2007
Location: City of Angels

Posts: 2,396
iTrader: (8)

Send a message via AIM to SfValley335i
Quote:
Originally Posted by Sick335 View Post
Berk doesnt seem to have any for 335s. Gonna do some research and hunt a pair down. At my power level i probably am missing abour 10-15whp with my mid cats

At fbo level stock turbos secondary cats are 10-15whp. With RB turbos and 20+ psi I bet its closer to 20whp.

Removing secondary cats will make the car louder, especially at cold start. It will also be more smelly, and possibilty for you to actually notice smoke coming out if the turbos are bad.

Resonators will help with rasp and loudness. Muffler mainly for drone and changing tone of the exhaust.

Btw the gains from removing secondary cats will be noticeable above 4k rpm, not below.
SfValley335i is offline   Afghanistan
0
Reply With Quote
      04-22-2013, 02:02 PM   #9
Sick335
Captain
 
Drives: 335i
Join Date: Oct 2011
Location: Tarzana, CA

Posts: 937
iTrader: (0)

I have had my mid cats removed before, and replaced with straight pipe. The drone was unbearable, the smell was even worse. Will having resonators take care of both the problems?
__________________

JB4 G5 ISO+BMS Flash+RB Turbos+Meth=
Sick335 is offline   United_States
0
Reply With Quote
      04-22-2013, 02:16 PM   #10
E90Company
Major General
 
E90Company's Avatar
 
Drives: Car
Join Date: Mar 2012
Location: FL

Posts: 6,145
iTrader: (2)

Quote:
Originally Posted by Sick335 View Post
I have had my mid cats removed before, and replaced with straight pipe. The drone was unbearable, the smell was even worse. Will having resonators take care of both the problems?
Nope
E90Company is offline   No_Country
0
Reply With Quote
      04-22-2013, 03:17 PM   #11
SfValley335i
Colonel
 
Drives: Current:135i Sold:335i sedan
Join Date: Mar 2007
Location: City of Angels

Posts: 2,396
iTrader: (8)

Send a message via AIM to SfValley335i
I believe the smell is mostly unburnt fuel....

I remember x pipes help with sound, possibly find a race muffler to fix drone
SfValley335i is offline   Afghanistan
0
Reply With Quote
      04-22-2013, 04:14 PM   #12
135Pats
Can't decide....
 
135Pats's Avatar
 
Drives: 135i
Join Date: May 2012
Location: Maryland

Posts: 5,373
iTrader: (1)

Quote:
Originally Posted by SfValley335i View Post
I believe the smell is mostly unburnt fuel....

I remember x pipes help with sound, possibly find a race muffler to fix drone
100% agree on that, Eisenmann, BMWP, Meisterschaft, etc make "race" axle backs that still retain a muffler so the drone isn't out of control.

The smell/smoke is usually a combo of unburnt fuel and oil blowing by, the oil blowby could come from numerous things on an N54. That is, unless coolant is burning off, in which case you have a more severe issue to deal with. Either way, resonators won't help you there.
__________________
E88 FBO N54 Alpinweiss/Coral Red/Meisterschaft Race/Berk Resonated/Macht Schnell 3"/ER CP/Synapse/VRSF FMIC/FFTEC LPFP/HFS-4 DO Stainless Lines/BMS DCI/BMS Thermostat Delete/Rob Beck PCV Valve + Cap/BMS OCC/PTF E50/ST Coilovers/M3 Front Control Arms + Tension Rods/M3 Subframe Bushings/M3 FSB/DINAN Camber Plates/Apex ARC-8/Project Kics/Macht Schnell Studs/VAC Hubs/Rogue Transmission Mounts/Alpina TCU Flash/Icarbon/Kerscher/BMW Performance
135Pats is online now   United_States
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 03:18 PM.




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