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
      10-01-2011, 09:21 PM   #1
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Secondary CATS delete - WOW!

Removed this mornig the secondary cat and... WOW!!
The sound is incredible!!
Especially the loud "TUM" on upshifting is gorgeous!!
A greet modify for 80 $.
I could not pare to drive and drive around , listening to the upshift sound!!!
Appreciate 0
      10-01-2011, 10:39 PM   #2
pbu06
Enlisted Member
United_States
6
Rep
36
Posts

Drives: 09' Z4 35i
Join Date: Jan 2011
Location: Indiana

iTrader: (0)

NEED SOUND VID!!!

Does it smell bad after taking it out?
Appreciate 0
      10-02-2011, 12:09 PM   #3
///NWIE89
Private
United_States
18
Rep
75
Posts

Drives: 2011 Z4 sDrive35i
Join Date: Jul 2011
Location: Crown Point, IN

iTrader: (0)

please get a video of this!
Appreciate 0
      10-02-2011, 08:15 PM   #4
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by ///NWIE89 View Post
please get a video of this!
Here we are :

1) on board video at:


2) gentle take off at:


Car is brand new (200 km), i shift @ 4000 RPM.

Completely stock except for secondary cats.

The exhaust tips are 4" applied to the oem mufflers, no more than that.

Bye!
Appreciate 0
      10-03-2011, 01:38 AM   #5
pbu06
Enlisted Member
United_States
6
Rep
36
Posts

Drives: 09' Z4 35i
Join Date: Jan 2011
Location: Indiana

iTrader: (0)

Quote:
Originally Posted by javol View Post
Here we are :

1) on board video at:


2) gentle take off at:


Car is brand new (200 km), i shift @ 4000 RPM.

Completely stock except for secondary cats.

The exhaust tips are 4" applied to the oem mufflers, no more than that.

Bye!
Thanks for the vid!

Is the sound louder in general or just different when you upshifting?
Appreciate 0
      10-03-2011, 07:53 AM   #6
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

It is a bit louder in general, you can ear it in my 2nd video.
Just perfect for my taste.
But the best is the "bluuurrpppp" on upshifting and the rumbling on downshifting!
Appreciate 0
      10-03-2011, 02:13 PM   #7
sDrive35i
Private
10
Rep
91
Posts

Drives: 2011 Z4 sDrive35i
Join Date: Jul 2011
Location: Brooklyn

iTrader: (0)

Now you got me thinking about doing the same. Is there any power loss to this? Also can you put it back incase for inspection?
__________________

2011 BMW Z4 sDrive35i
2010 Nissan Maxima
Appreciate 0
      10-03-2011, 07:38 PM   #8
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by sDrive35i View Post
Now you got me thinking about doing the same. Is there any power loss to this? Also can you put it back incase for inspection?
No power loss at all.

For what concern "putting back" is tedious, not impossible.

It is a cut and weld work.
Appreciate 0
      10-14-2011, 11:02 PM   #9
haspi
Private First Class
United_States
13
Rep
118
Posts

Drives: SDrive35i
Join Date: Sep 2009
Location: .

iTrader: (0)

Quote:
Originally Posted by javol View Post
No power loss at all.

For what concern "putting back" is tedious, not impossible.

It is a cut and weld work.
Any warranty issues?

Sorry for the stupid question but how do you do it?
Appreciate 0
      10-16-2011, 10:19 AM   #10
az34
Major
az34's Avatar
Canada
54
Rep
1,014
Posts

Drives: 2009 z4sdrive35i 2008 x5 3.0i
Join Date: May 2011
Location: montréal

iTrader: (0)

Very Simple You Have To Cut At Each End Of The Cat Whit A Sawsall And Replace It Whit Straight Pipe
Appreciate 0
      10-18-2011, 01:02 PM   #11
datbimmerdoe
Lieutenant General
datbimmerdoe's Avatar
United_States
1265
Rep
17,493
Posts

Drives: like I'M BOUT THAT LIFE
Join Date: Jul 2008
Location: PARADISE aka CANES COUNTRY

iTrader: (0)

sounds great
__________________
#datbimmerdoe #thatbimmertho

FOLLOW @datbimmerdoe on INSTAGRAM
Appreciate 0
      10-23-2011, 08:23 AM   #12
bin karama
New Member
3
Rep
9
Posts

Drives: E89 - 2012 Z4 sDrive35is
Join Date: Jan 2011
Location: United Arab Emirates

iTrader: (0)

do you get any problems with the computer system ?? like engine check or an other problems ??
Appreciate 0
      10-23-2011, 07:27 PM   #13
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by bin karama View Post
do you get any problems with the computer system ?? like engine check or an other problems ??
No problems at all.
Appreciate 0
      06-11-2012, 08:49 AM   #14
Asbjorn
Captain
Asbjorn's Avatar
China
89
Rep
833
Posts

Drives: Z4 N54 DCT (VTT GC lites)
Join Date: Mar 2012
Location: European in China

iTrader: (0)

hi Javol

More than half a year has passed, was wondering if you still enjoy this mod?
Appreciate 0
      06-16-2012, 01:06 PM   #15
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by Asbjørn View Post
hi Javol

More than half a year has passed, was wondering if you still enjoy this mod?
Completely
__________________
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
      08-14-2012, 10:56 AM   #16
ymdd
Private First Class
17
Rep
107
Posts

Drives: not fast enough
Join Date: Apr 2012
Location: usa

iTrader: (0)

Sorry if this is a stupid question but what's the difference between the secondary cats and the first cats?
Appreciate 0
      08-14-2012, 08:41 PM   #17
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by ymdd View Post
Sorry if this is a stupid question but what's the difference between the secondary cats and the first cats?
In the N54 engine, the 2 primary cats are part of the downpipes, hence are practically located at 15-20 cm from the turbos. They are the most effective in reducing emissions and the most restrictive in term of exhaust flow, quitting power and torque. Removing the primary cats gan give you aprox 20-30 whp, depending on the chip tuning you run, and less turbo lag. The secondary cats are located aprox in the center of the car, welded to the midpipes. Removing them does NOT improve power and torque nor reduce turbo lag. Probably the emissions increase and it depends on how much severe are the laws where you live to go with this mod or not. For what concern the Z4 35i, I think this is the best mod to have a louder sound and an amplified upshift "TUM" @ very low cost, at least in Italy.
__________________
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
      08-19-2012, 10:50 AM   #18
///MIKE
Second Lieutenant
///MIKE's Avatar
11
Rep
202
Posts

Drives: E89 35iS
Join Date: Sep 2010
Location: Hong Kong

iTrader: (0)

What about the iS?
__________________
2012 E89 35iS
Appreciate 0
      08-19-2012, 02:39 PM   #19
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by ///MIKE View Post
What about the iS?
35i and 35is share the same exhaust parts and layout except for the rear end mufflers, sligthly different. This mod should give the same sound increase in both models.
__________________
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
      10-01-2012, 06:35 AM   #20
castilla
Second Lieutenant
51
Rep
230
Posts

Drives: 2014 M4
Join Date: Mar 2012
Location: tr

iTrader: (0)

i am thinking to do it on my z4 20i but i am curious about if there will be any error on screen ?

and i dont know how many cats does 20i ( n20 engine ) have
Appreciate 0
      10-01-2012, 11:03 AM   #21
javol
Private First Class
Italy
20
Rep
155
Posts

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

iTrader: (0)

Quote:
Originally Posted by castilla View Post
i am thinking to do it on my z4 20i but i am curious about if there will be any error on screen ?

and i dont know how many cats does 20i ( n20 engine ) have
Here http://www.realoem.com/bmw/ you will find everything about your car
__________________
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
      10-01-2012, 01:18 PM   #22
castilla
Second Lieutenant
51
Rep
230
Posts

Drives: 2014 M4
Join Date: Mar 2012
Location: tr

iTrader: (0)

okay thanks but any ideas about error ? when i delete cat maybe some sensors will not work properly and it cause error on screen
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 06:00 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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