BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      12-24-2010, 11:00 PM   #1
Dmacc
Colonel
200
Rep
2,799
Posts

Drives: 2011 BMW 1M
Join Date: Mar 2010
Location: So Cal

iTrader: (1)

Question about exhaust rasp

This could be a really stupid question but I have 2.5 inch catless downpipes leading to my stock midpipes with the cats removed, a resonator delete, and the stock exhaust. There is an extremely annoying rasp between 1700-2000 rpms when the engine is under a load.

My question is if I put the resonator back in, do you think the rasp will disappear?
__________________

thanks to MGallop
Appreciate 0
      12-25-2010, 12:22 AM   #2
1speedbike
Brigadier General
1speedbike's Avatar
734
Rep
3,274
Posts

Drives: 2022 X4 M40i, 2008 135i
Join Date: Jun 2008
Location: MKE

iTrader: (15)

Quoting Berk Tech:

"The exhaust system as a whole will sound a lot smoother if you have resonated midpipes vs. non-resonated. The resonators mellow out the system for for a smoother overall tone."

if the overall smoothness of the tone is what you're talking about with the rasp, then yes they definitely help
__________________
2022 X4 M40i - 2008 135i - 2015 F700GS
On Order - 2024 i4 M50

Scruffy's gonna die the way he lived... Mmhm.


Appreciate 0
      12-25-2010, 05:18 PM   #3
Dmacc
Colonel
200
Rep
2,799
Posts

Drives: 2011 BMW 1M
Join Date: Mar 2010
Location: So Cal

iTrader: (1)

Quote:
Originally Posted by 1speedbike View Post
Quoting Berk Tech:

"The exhaust system as a whole will sound a lot smoother if you have resonated midpipes vs. non-resonated. The resonators mellow out the system for for a smoother overall tone."

if the overall smoothness of the tone is what you're talking about with the rasp, then yes they definitely help
Thanks a lot! i'll be getting my resonator put back in in two days and i'll post a video
__________________

thanks to MGallop
Appreciate 0
      12-25-2010, 06:35 PM   #4
1speedbike
Brigadier General
1speedbike's Avatar
734
Rep
3,274
Posts

Drives: 2022 X4 M40i, 2008 135i
Join Date: Jun 2008
Location: MKE

iTrader: (15)

Quote:
Originally Posted by Dmacc View Post
Thanks a lot! i'll be getting my resonator put back in in two days and i'll post a video
looking forward to seeing / hearing it!!
__________________
2022 X4 M40i - 2008 135i - 2015 F700GS
On Order - 2024 i4 M50

Scruffy's gonna die the way he lived... Mmhm.


Appreciate 0
      12-25-2010, 08:39 PM   #5
My135
Lieutenant Colonel
85
Rep
1,609
Posts

Drives:
Join Date: Mar 2008

iTrader: (0)

The rasp that you desribed is drone. The resonator only minimize the drone but cannot completely get ride of it. Almost all after market exhaust has this problem and just a matter of degree. I guess this is the penalty that you paid for louder exhaust.
__________________
7/08 135 Coupe, Crimson Red, 6 SP, Sport, Taupe Lette/Aluminum. Performance Mods: JB4 on Map 5, BMS DP Fix V3, Injen polished intake, AR Catless DP, Maddad resonated mid-pipes, aFe exhaust polished tips, ST Suspension Coil Over and Hotchkis front sway bar. Others: BMS OCC, BT Scanner, Mud Flap. Next Mods: AA Front Strut Brace.
Appreciate 0
      12-27-2010, 03:45 PM   #6
Dmacc
Colonel
200
Rep
2,799
Posts

Drives: 2011 BMW 1M
Join Date: Mar 2010
Location: So Cal

iTrader: (1)

I put the resonator in today and walah, the rasp is gone. the car sounds mean completely catless with the stock muffler, i'll put up a video a little later
__________________

thanks to MGallop
Appreciate 0
      12-27-2010, 09:05 PM   #7
1speedbike
Brigadier General
1speedbike's Avatar
734
Rep
3,274
Posts

Drives: 2022 X4 M40i, 2008 135i
Join Date: Jun 2008
Location: MKE

iTrader: (15)

Quote:
Originally Posted by Dmacc View Post
I put the resonator in today and walah, the rasp is gone. the car sounds mean completely catless with the stock muffler, i'll put up a video a little later
That's great!

can't wait to hear it!
__________________
2022 X4 M40i - 2008 135i - 2015 F700GS
On Order - 2024 i4 M50

Scruffy's gonna die the way he lived... Mmhm.


Appreciate 0
      12-27-2010, 11:16 PM   #8
Forcefed3
Banned
No_Country
127
Rep
4,732
Posts

Drives: 2008 335i
Join Date: May 2010
Location: South

iTrader: (2)

Garage List
2008 335i  [1.00]
Quote:
Originally Posted by Dmacc View Post
This could be a really stupid question but I have 2.5 inch catless downpipes leading to my stock midpipes with the cats removed, a resonator delete, and the stock exhaust. There is an extremely annoying rasp between 1700-2000 rpms when the engine is under a load.

My question is if I put the resonator back in, do you think the rasp will disappear?
How much did the initial resonator delete cost?
Appreciate 0
      12-28-2010, 06:07 PM   #9
richsnuc
Retired USN LT
United_States
18
Rep
192
Posts

Drives: 2024 X5M60i Avus Blue/Coffee
Join Date: Nov 2007
Location: NC

iTrader: (0)

How can you have a catless car in California???
Appreciate 0
      12-28-2010, 09:19 PM   #10
Dmacc
Colonel
200
Rep
2,799
Posts

Drives: 2011 BMW 1M
Join Date: Mar 2010
Location: So Cal

iTrader: (1)

You can't have a catless car in cali hahah but i'll have to change it up before emissions, but the initial cost of the resonator delete for me was $30 from a local mufflershop, and it was $40 to put back on. Pretty cheap
__________________

thanks to MGallop
Appreciate 0
      03-24-2011, 12:41 PM   #11
Dmacc
Colonel
200
Rep
2,799
Posts

Drives: 2011 BMW 1M
Join Date: Mar 2010
Location: So Cal

iTrader: (1)

found the source of my rasp, I had about two exhaust leaks in my midpipes due to shitty welding, I just put on my agency power midpipes that I ordered, and now the car purrs so perfectly
__________________

thanks to MGallop
Appreciate 0
      07-24-2015, 09:22 PM   #12
rod.bearings
Lieutenant
rod.bearings's Avatar
Canada
124
Rep
546
Posts

Drives: E92 M3
Join Date: Dec 2013
Location: Alberta

iTrader: (3)

Garage List
2009 BMW 135i  [0.00]
Quote:
Originally Posted by Dmacc View Post
found the source of my rasp, I had about two exhaust leaks in my midpipes due to shitty welding, I just put on my agency power midpipes that I ordered, and now the car purrs so perfectly
How'd you know it was exhaust leak and not resonators?
I had a similar setup as you and mine rasped like crazy at lower rpms
AR DP + secondary cat delete + PE Y-Pipe + PE Muffler

Recently put in vibrant resonators and took away all the rasp
Kinda too quiet now =/ (Unless i got use to the loud rasp lol) so if its really exhaust leak I might cut them again and check welds
Appreciate 0
Post Reply

Bookmarks


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 12:22 AM.




1addicts
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