E90Post
 


Lux Angel Eyes
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Electric cut out exhaust



Reply
 
Thread Tools Search this Thread
      10-17-2013, 08:12 AM   #1
dapz325
Roller coaster operator
0

 
dapz325's Avatar
 
Drives: 2008 335i
Join Date: Aug 2013
Location: Louisiana


Posts: 33
iTrader: (0)

Electric cut out exhaust

So I have been thinking of doing a muffler delete but the videos got me worried. I like to be stealth sometimes but other times I would love to hear the exhaust note more. I thought why not have them both with an electric cut out system . I would probably have to put two of them on and at around $200 a piece plus the cost of installation would it be worth it? Where would be the best place to put them? I don't want to spend to much money on a set up. There are soooooo many different set ups but video recordings don't to any justice . If i decide not take this route i would like to change the mufflers to give a tab bit louder sound. Before i get all these Whats your opinion on a cheap set up?

Dap*
__________________
Got a crusty air filter
Appreciate 0
      10-17-2013, 09:04 AM   #2
pwr hungry
Banned
14

 
Drives: 335
Join Date: Mar 2013
Location: Amer'ca


Posts: 1,260
iTrader: (2)

Cutouts are going to make it loud as f*ck! As far as where to put them...unless you want crazy amounts of rasp, you're going to need to place them at a particular distance, or multiple of that distance from the engine. If you google "how to get rid of exhaust drone" there is a very informative thread on the markIV supra forums with the equations needed to properly place resonance tubes for the same thing. Just read through the first post and your questions should be answered.
Appreciate 0
      10-17-2013, 10:58 AM   #3
Jeff@TopGearSolutions
BimmerPost Supporting Vendor
United_States
237


 
Jeff@TopGearSolutions's Avatar
 
Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com


Posts: 18,049
iTrader: (32)

Send a message via AIM to Jeff@TopGearSolutions

It's on an M3 but I would try to mimic that.
Appreciate 0
      10-17-2013, 03:23 PM   #4
Torgus
Slow.
United_States
9

 
Torgus's Avatar
 
Drives: E90 & E92 with 487 ftlbs of tq
Join Date: Jun 2012
Location: Boston, MA


Posts: 993
iTrader: (0)

Garage List
2007 BMW E92  [5.00]
Quote:
Originally Posted by Jeff@TopGearSolutions View Post

It's on an M3 but I would try to mimic that.
If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
__________________
E92 Bren Tune
E90 PTF Tune
Appreciate 0
      10-17-2013, 07:30 PM   #5
dapz325
Roller coaster operator
0

 
dapz325's Avatar
 
Drives: 2008 335i
Join Date: Aug 2013
Location: Louisiana


Posts: 33
iTrader: (0)

Quote:
Originally Posted by Torgus View Post
If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
That's what I was thinking , at least before the cats for I could see some kind of gain. This might be a dumb question but I tried to google it but couldn't come up with anything. Would it have any negative effects if i just modified one exhaust pipe. Leave one stock and open the other when i want to have a little bit more grunt. Doesnt seem like there would be but maybe someone other knows something I dont. Thanks for all the replies
__________________
Got a crusty air filter
Appreciate 0
      10-17-2013, 10:48 PM   #6
King mode
First Lieutenant
4

 
Drives: 335xi
Join Date: May 2012
Location: Denver


Posts: 374
iTrader: (0)

For best performance you want it as close to the turbo as possible. Right after dp's would be ideal. Less back pressure, more flow, faster spool. I had this setup on a big turbo 1.8t about 10" after the turbo. It was good for 15whp vs full 3" turbo back exhaust.
__________________
2008 335xi AT
Cobb AP stage 1, drop in filter, the rest stock
13.10@106.01 w/ 1.86 60' (5,800' altitude)
Appreciate 0
      10-17-2013, 11:21 PM   #7
akotten
Major
13

 
akotten's Avatar
 
Drives: 2007 335xi
Join Date: Mar 2011
Location: Rapid City, SD


Posts: 1,043
iTrader: (2)

You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
__________________
TC Kline S/A | Vorshlag Camber Plates | ///M Bushings & ARB | CP-e DPs | VRSF FMIC | Procede 2.5 w/ OpenFlash | DCI |
Appreciate 0
      10-17-2013, 11:45 PM   #8
dapz325
Roller coaster operator
0

 
dapz325's Avatar
 
Drives: 2008 335i
Join Date: Aug 2013
Location: Louisiana


Posts: 33
iTrader: (0)

Quote:
Originally Posted by akotten View Post
You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
Never even crossed my mind! genius! then I can just use jb4 control to open and close it!
__________________
Got a crusty air filter
Appreciate 0
      10-17-2013, 11:46 PM   #9
akotten
Major
13

 
akotten's Avatar
 
Drives: 2007 335xi
Join Date: Mar 2011
Location: Rapid City, SD


Posts: 1,043
iTrader: (2)

Quote:
Originally Posted by dapz325 View Post
Never even crossed my mind! genius! then I can just use jb4 control to open and close it!
Bingo!
__________________
TC Kline S/A | Vorshlag Camber Plates | ///M Bushings & ARB | CP-e DPs | VRSF FMIC | Procede 2.5 w/ OpenFlash | DCI |
Appreciate 0
      10-18-2013, 08:51 AM   #10
Torgus
Slow.
United_States
9

 
Torgus's Avatar
 
Drives: E90 & E92 with 487 ftlbs of tq
Join Date: Jun 2012
Location: Boston, MA


Posts: 993
iTrader: (0)

Garage List
2007 BMW E92  [5.00]
Just wanted to add cutouts are Notorious for getting stuck. I wouldn't use them myself on a DD.

Also the cost to install two reliable cutouts right after the stock downpipes is slightly on the high side for the gains...probably looking at $250 per cutout + $50 each installed assuming there is space and no modifications have to be made...I guess the easiest would be go with the 3.5 VRSF and just dump right off that for space reasons.

I don't know if they HP gains are worth it, but having it controlled via engine rpm or throttle position would be fucking SWEET.
__________________
E92 Bren Tune
E90 PTF Tune
Appreciate 0
      10-18-2013, 12:14 PM   #11
longliven54
Lieutenant
Canada
4

 
longliven54's Avatar
 
Drives: 2007 335i e90 auto
Join Date: Jan 2011
Location: victoria


Posts: 465
iTrader: (6)

I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
__________________
JB4 G5 / VRSF IC / STETT CAI / GREDDY / custom exhaust / iRotora cross drilled rotots / snow stage 3 meth / 19" iForged senekas / upgraded speakers n CF woofer box / M3 bits/ DINAN camber plates/ KONI/ megan racing toe arm/ supreme power lowering perch
Appreciate 0
      10-18-2013, 12:16 PM   #12
longliven54
Lieutenant
Canada
4

 
longliven54's Avatar
 
Drives: 2007 335i e90 auto
Join Date: Jan 2011
Location: victoria


Posts: 465
iTrader: (6)

with cutouts open, car does feel faster based upon butt dyno. feels similar gains as I got from downpipes.
__________________
JB4 G5 / VRSF IC / STETT CAI / GREDDY / custom exhaust / iRotora cross drilled rotots / snow stage 3 meth / 19" iForged senekas / upgraded speakers n CF woofer box / M3 bits/ DINAN camber plates/ KONI/ megan racing toe arm/ supreme power lowering perch
Appreciate 0
      10-18-2013, 12:17 PM   #13
Jeff@TopGearSolutions
BimmerPost Supporting Vendor
United_States
237


 
Jeff@TopGearSolutions's Avatar
 
Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com


Posts: 18,049
iTrader: (32)

Send a message via AIM to Jeff@TopGearSolutions
Quote:
Originally Posted by Torgus View Post
If you are going to dump for performance shouldn't it be as close to the turbo as possible? Why put it back by the mufflers?
If possible you could dump earlier but the OP's request was he didn't want to a do a muffler delete but wanted cut outs to mimic them. (atleast that is what I gathered).

So this is the equivalent to a muffler delete with electric cut outs as they are right before the mufflers.

Sky is the limit if you have the clearance. Dump them after the turbo's for the most power gain but I'm not sure how feasible that is on this particular platform.
Appreciate 0
      10-18-2013, 04:03 PM   #14
FCobra94
Major
14

 
FCobra94's Avatar
 
Drives: '07 E90 335i
Join Date: Dec 2011
Location: MD


Posts: 1,387
iTrader: (0)

Quote:
Originally Posted by akotten
You could get creative and use the signal going to the stock exhaust flap to control them. That would be interesting! Quiet start up when cold and low cruising, but then opens up under load.
Or you could just use a boost activated cutout like this one:
http://www.spracingonline.com/spblog/?p=131

No motors to replace, etc.
__________________
'07 E90 335i - Automagic - Non-sport
Cobb AP|Alpina Flash|VRSF 7" FMIC|VRSF CP|TIAL BOV|cp-e DCI|Bilstein B6|E93 M3 FSB|SP Lowering Perches
Summer: Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10mm rear spacers
Winter: Style 159 - 17x8 ET34 - Michelin X-Ice Xi2 225/50/17 - 15mm rear spacers
Appreciate 0
      10-18-2013, 08:47 PM   #15
gzim335
Captain
Montenegro
10

 
gzim335's Avatar
 
Drives: 07 e90n54-08 zx10r-lci328ix
Join Date: Feb 2011
Location: staten island ny


Posts: 631
iTrader: (4)

Garage List
2007/1 e90 335i  [1.00]
I have cl dps and sec cat delete,stock resonator in place and muffler delete n left flap on the driver side.
It's sounds great,there is some drone around 2700 rpm but it's honesty not that bad
__________________
2007/1 e90 335i jet black

jb4 g5 iso/race flash--rb turbos/rb pcv--bms occ--dci/scoops--cpe dp's corsa race full system--cpe ic--er cp/hks bov--trunk mount meth cm7/cm10--inline lpfp--kw v2/stoptech bbk f&r--m3 bits f&r,m3 fsb,wavetrack lsd--f14s nitto invo--lci conversion
Appreciate 0
      10-21-2013, 11:16 AM   #16
dapz325
Roller coaster operator
0

 
dapz325's Avatar
 
Drives: 2008 335i
Join Date: Aug 2013
Location: Louisiana


Posts: 33
iTrader: (0)

Quote:
Originally Posted by longliven54 View Post
I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
Where are they placed?
__________________
Got a crusty air filter
Appreciate 0
      10-21-2013, 11:19 AM   #17
dapz325
Roller coaster operator
0

 
dapz325's Avatar
 
Drives: 2008 335i
Join Date: Aug 2013
Location: Louisiana


Posts: 33
iTrader: (0)

Would it be safe to only alter one side of the exhaust or would that have negative effects?
__________________
Got a crusty air filter
Appreciate 0
      10-21-2013, 11:31 AM   #18
Jeff@TopGearSolutions
BimmerPost Supporting Vendor
United_States
237


 
Jeff@TopGearSolutions's Avatar
 
Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com


Posts: 18,049
iTrader: (32)

Send a message via AIM to Jeff@TopGearSolutions
Quote:
Originally Posted by FCobra94 View Post
Or you could just use a boost activated cutout like this one:
http://www.spracingonline.com/spblog/?p=131

No motors to replace, etc.
I like the idea of wiring it up to a solenoid. Then you can put it on a switch.

The corvette and some other platforms use a similar system.

I have a remote switch on mine so I can open it on the fly.

Quote:
Originally Posted by dapz325 View Post
Would it be safe to only alter one side of the exhaust or would that have negative effects?
You wouldn't have equal flow for both turbo's.
I'm not sure how "bad" it really is but it's definitely not ideal from a performance standpoint or balancing exhaust gasses.
Appreciate 0
      10-23-2013, 12:16 AM   #19
longliven54
Lieutenant
Canada
4

 
longliven54's Avatar
 
Drives: 2007 335i e90 auto
Join Date: Jan 2011
Location: victoria


Posts: 465
iTrader: (6)

Quote:
Originally Posted by dapz325
Quote:
Originally Posted by longliven54 View Post
I have had electric cutouts for about a year now. exhaust note has progressively gone louder as the cutouts do not seal all the exhaust gases. still a great DD, no drone just a bit louder than OEM overall.
Where are they placed?
they are placed soon after the down pipes, just as mid pipes start
__________________
JB4 G5 / VRSF IC / STETT CAI / GREDDY / custom exhaust / iRotora cross drilled rotots / snow stage 3 meth / 19" iForged senekas / upgraded speakers n CF woofer box / M3 bits/ DINAN camber plates/ KONI/ megan racing toe arm/ supreme power lowering perch
Appreciate 0
      10-23-2013, 01:52 PM   #20
uberbeast21
Captain
United_States
8

 
uberbeast21's Avatar
 
Drives: 2009 335i e92 dinan S2
Join Date: Jan 2013
Location: santa barbara CA


Posts: 658
iTrader: (0)

Garage List
2009 BMW 335i  [0.00]
Send a message via Skype™ to uberbeast21
love this idea flip a switch and u got track mode
__________________
e92 335i l Dinan stage II l VMR V710 l BMW PE l KW V1 l Cusco strut brace l Cyba 4"dry carbon l

Appreciate 0
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 06:20 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