New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications

Post Reply
 
Thread Tools Search this Thread
      02-06-2013, 01:54 PM   #1
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

Has anyone done catless Midpipe and DP?

Hey guys,

In a bid to make my car slightly louder and hopefully more sporty sounding, I was contemplating changing my midpipe to catless. However, I already have a catless DP and my worry was that it would be bone shaking loud. I loved the sound of my old E92 M with just an catless X pipe and wanted to duplicate it as close as possible.

So just wondering if anyone has done both midpipe and DP catless and how loud did they perceive it became. Bearable? Drone? etc?

Thanks
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
Appreciate 0
      02-06-2013, 02:35 PM   #2
javol
Private First Class
Italy
11

 
Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile


Posts: 154
iTrader: (0)

Quote:
Originally Posted by mpbruin108 View Post
Hey guys,

In a bid to make my car slightly louder and hopefully more sporty sounding, I was contemplating changing my midpipe to catless. However, I already have a catless DP and my worry was that it would be bone shaking loud. I loved the sound of my old E92 M with just an catless X pipe and wanted to duplicate it as close as possible.

So just wondering if anyone has done both midpipe and DP catless and how loud did they perceive it became. Bearable? Drone? etc?

Thanks
I did it and it sounded raspy (with OEM rear mufflers). I should add 2 "mid pipes resonators" to achieve a good compromise.
__________________
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.
Appreciate 0
      02-06-2013, 10:26 PM   #3
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

Is it pretty loud? Like Eisennman sport loud?
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
Appreciate 0
      02-07-2013, 03:19 PM   #4
javol
Private First Class
Italy
11

 
Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile


Posts: 154
iTrader: (0)

Quote:
Originally Posted by mpbruin108 View Post
Is it pretty loud? Like Eisennman sport loud?
Loud but RASPY. Something like a GREEEEEKKKKKK!

It doesn't sound good completely decatted + OEM mufflers.
__________________
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.
Appreciate 0
      02-08-2013, 04:40 AM   #5
Toink
Enlisted Member
1

 
Toink's Avatar
 
Drives: E89 Z4 sDrive35is
Join Date: Jan 2013
Location: Netherlands


Posts: 33
iTrader: (0)

OK good to know. I just received my Milltek catreplacements so I won't swap the DP in that case.
Appreciate 0
      02-08-2013, 04:44 AM   #6
jannisa
Lieutenant
22

 
jannisa's Avatar
 
Drives: Z4 Sdrive35i
Join Date: Jun 2009
Location: Greece - IMF


Posts: 490
iTrader: (0)

Quote:
Originally Posted by javol View Post
Loud but RASPY. Something like a GREEEEEKKKKKK!

It doesn't sound good completely decatted + OEM mufflers.
What exactly do you mean by that?
Appreciate 0
      02-08-2013, 05:13 AM   #7
ManiacGT
Major
United Kingdom
39

 
ManiacGT's Avatar
 
Drives: Z4 sDrive 35i
Join Date: Jan 2011
Location: Manchester, UK


Posts: 1,336
iTrader: (0)

Send a message via MSN to ManiacGT
We need a video to see/hear the result!
__________________
Black Sapphire BMW Z4 sDrive35i Mods: HiFi Tweeters Stubby LED Halos & Front Indicators DVDInMotion SmartTop 313 BMW Performance Alloys LCI Repeaters http://goo.gl/PF4nSz
Appreciate 0
      02-08-2013, 12:00 PM   #8
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

Quote:
Originally Posted by javol View Post
Loud but RASPY. Something like a GREEEEEKKKKKK!

It doesn't sound good completely decatted + OEM mufflers.
lol I'll take your word for it. Probably just get some Eisennman then.
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
Appreciate 0
      02-09-2013, 11:21 PM   #9
javol
Private First Class
Italy
11

 
Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile


Posts: 154
iTrader: (0)

Quote:
Originally Posted by jannisa View Post
What exactly do you mean by that?
Ops! It was just a sound, I didn't realize the posible interpretation of the word, sorry buddy!... Better if change it to a GRAAAAAAACCCKKK
__________________
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.
Appreciate 0
      02-10-2013, 03:50 AM   #10
Asbjorn
Captain
China
16

 
Asbjorn's Avatar
 
Drives: ESS twin-turbo roadster (E89)
Join Date: Mar 2012
Location: European in China


Posts: 616
iTrader: (0)

Quote:
Originally Posted by javol View Post
Ops! It was just a sound, I didn't realize the posible interpretation of the word, sorry buddy!... Better if change it to a GRAAAAAAACCCKKK


btw, is it really safe to change the flow resistance right after the turbos (ie alter the back pressure at the DPs)? Or can they re-adjust the boost to the desired level by themselves?
__________________
Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
Appreciate 0
      02-10-2013, 04:45 AM   #11
jannisa
Lieutenant
22

 
jannisa's Avatar
 
Drives: Z4 Sdrive35i
Join Date: Jun 2009
Location: Greece - IMF


Posts: 490
iTrader: (0)

Quote:
Originally Posted by javol View Post
Ops! It was just a sound, I didn't realize the posible interpretation of the word, sorry buddy!... Better if change it to a GRAAAAAAACCCKKK
Grack is what my hometown is called, mate you're doing it all wrong.



(Kidding, thanks for your explanation )
Appreciate 0
      02-10-2013, 11:15 AM   #12
VailM3
Lieutenant
15

 
Drives: 2011 Z4 35is
Join Date: Jan 2013
Location: Geneva Switzerland


Posts: 561
iTrader: (0)

Quote:
Originally Posted by ManiacGT View Post
We need a video to see/hear the result!
We need a video compilation of all exhaust options...
Appreciate 0
      02-11-2013, 06:21 PM   #13
javol
Private First Class
Italy
11

 
Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile


Posts: 154
iTrader: (0)

Quote:
Originally Posted by Asbjørn View Post


btw, is it really safe to change the flow resistance right after the turbos (ie alter the back pressure at the DPs)? Or can they re-adjust the boost to the desired level by themselves?
DPs are a really nice mod, the car feels smarter since the throttle response is improved (less turbo lag). No bad effects on the low-end torque. I could feel the DPs performance benefits with and without the JB4.

For what concern the engine health... the oil temps seems to be lower with the decatted DPs installed...
__________________
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.
Appreciate 0
      02-13-2013, 07:25 AM   #14
Asbjorn
Captain
China
16

 
Asbjorn's Avatar
 
Drives: ESS twin-turbo roadster (E89)
Join Date: Mar 2012
Location: European in China


Posts: 616
iTrader: (0)

Quote:
Originally Posted by javol View Post
DPs are a really nice mod, the car feels smarter since the throttle response is improved (less turbo lag). No bad effects on the low-end torque. I could feel the DPs performance benefits with and without the JB4.
Again, perhaps a stupid question, but are you sure that is not because the turbo boost has increased as the exhaust flow is less restricted?

Or is it somehow controlled by the ECU? And if so, is the explanation that target boost is reached faster due to lower flow resistance?
__________________
Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
Appreciate 0
      02-15-2013, 12:03 AM   #15
javol
Private First Class
Italy
11

 
Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile


Posts: 154
iTrader: (0)

Quote:
Originally Posted by Asbjørn View Post
Again, perhaps a stupid question, but are you sure that is not because the turbo boost has increased as the exhaust flow is less restricted?

Or is it somehow controlled by the ECU? And if so, is the explanation that target boost is reached faster due to lower flow resistance?
The turbo boost is controlled by the ECU: with stock map it is aprox. 8 psi and as you say, with decatted DPs, this target is reached faster due to the lower flow resistance. With JB4 map 2 (my case) the boost grown up to 15 psi due to the input signal of the modified ECU and, once again, those psi are reached faster due to the lower flow resistance of the decatted DPs.
__________________
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.
Appreciate 0
      02-18-2013, 09:52 AM   #16
Vintage
Colonel
United_States
47

 
Vintage's Avatar
 
Drives: 2010 Z4 35i and 2014 535d x
Join Date: Aug 2009
Location: Austin, Texas


Posts: 2,263
iTrader: (0)

well, I have Eisenmann Race and AR race cat DPs; it is a great combination. I had the race cats in the DPs since Eisenmann eliminates the secondary cats; I did not want what would have been essentially a straight through system has we not included cats in the DPs
Appreciate 0
      02-18-2013, 02:01 PM   #17
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

My main concern with the Eisennman is that I have the catless AR DP so the elimination of the secondary cats in he Eisennman worries me in terms of loudness and sound. But talking to Tom @ EAS, it seems that the turbo cars are quieter overall than the M cars in terms of exhaust systems...so I'm still considering it...I should have gotten the Race Cat AR DPs.
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
Appreciate 0
      02-23-2013, 10:40 PM   #18
AsiaKid
Lieutenant
25

 
Drives: Gallardo Spyder // Vellfire
Join Date: Jul 2011
Location: Hong Kong


Posts: 513
iTrader: (0)

I have the catted dps from ar and cal2nd cat delete. Sds good but a bit raspy.
Appreciate 0
      02-26-2013, 12:22 PM   #19
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

drone?
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
Appreciate 0
      03-02-2013, 06:59 PM   #20
al1
Private
5

 
Drives: z4 35i
Join Date: Aug 2010
Location: Istanbul / Turkey


Posts: 86
iTrader: (0)

Quote:
Originally Posted by AsiaKid View Post
I have the catted dps from ar and cal2nd cat delete. Sds good but a bit raspy.
would love to hear it
Appreciate 0
      05-14-2013, 04:29 AM   #21
Yeggman
Private First Class
2

 
Drives: 2009 Z4 s3.0i 6MT
Join Date: Sep 2012
Location: Florida


Posts: 108
iTrader: (0)

Quote:
Originally Posted by mpbruin108 View Post
My main concern with the Eisennman is that I have the catless AR DP so the elimination of the secondary cats in he Eisennman worries me in terms of loudness and sound.
Living in LA, isn't there a concern about Enforcement authorities, and periodic inspections?
Appreciate 0
      05-14-2013, 08:48 PM   #22
mpbruin108
Mpbruin108
21

 
mpbruin108's Avatar
 
Drives: I'm a hypermiler
Join Date: Jul 2011
Location: los angeles


Posts: 561
iTrader: (6)

inspections? enforcement? loud cars are so common these days in LA...i can't remember the last time I got even a talk about having a loud car. It's mostly the folks who show off obnoxiously that get the attention.
__________________
2015 M4 Mineral Grey with SO

2013 Tesla Model S, 2010 RR Phantom, 2014 S550, 2014 BMW X5, 2015 Cayenne S platinum edition
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


All times are GMT -5. The time now is 03:09 AM.




zpost
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