Drivetrain (Cooper S) MINI Cooper S (R56) intakes, exhausts, pulleys, headers, throttle bodies, and any other modifications to the Cooper S drivetrain.

Drivetrain Downpipes (Overboost?)

  #1  
Old 03-25-2019, 05:01 AM
Floydian
Floydian is offline
Neutral
Thread Starter
Join Date: Mar 2019
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Downpipes (Overboost?)

This is going to be a long thread so bear with me.

I have a 2015 BMW 120i F20 LCI with the N13 engine. (Turbo is Garrett MGT1549 ZDL)

It already has a K&N Drop in Filter, 70mm Cat-back exhaust, GFB DV+, Wagner Competition Intercooler, Racechip Ultimate, and NGK 5992 plugs from the Mini JCW, I run it on 99 Ron fuel.

I am planning on replacing the downpipe with a catless version, has anyone faced with boost spike or boost creep after fitting a catless downpipe on a piggyback tune such as Racechip? Unfortunately remapping the car is out of the question for me at the moment.

I posted here as the N13 engine is very similar to the N18.
 
  #2  
Old 03-26-2019, 11:35 AM
PEneoark
PEneoark is offline
1st Gear
Join Date: Sep 2018
Location: Holley, NY
Posts: 48
Received 2 Likes on 2 Posts
Have you tried a BMW forum?
 
  #3  
Old 03-26-2019, 11:45 AM
njaremka's Avatar
njaremka
njaremka is offline
6th Gear
Join Date: Jul 2016
Location: Connecticut
Posts: 1,422
Received 160 Likes on 140 Posts
I thought the boost control improved when I replaced the down pipe with a cat-less version. With less back pressure, seems easier for the waste gate to control the boost pressure.
 
  #4  
Old 03-26-2019, 02:28 PM
knt
knt is offline
2nd Gear
Join Date: Dec 2018
Posts: 84
Received 3 Likes on 3 Posts
Won't running a catless downpipe give you a dashboard error without a proper remap?
 
  #5  
Old 03-27-2019, 03:31 AM
njaremka's Avatar
njaremka
njaremka is offline
6th Gear
Join Date: Jul 2016
Location: Connecticut
Posts: 1,422
Received 160 Likes on 140 Posts
Originally Posted by knt View Post
Won't running a catless downpipe give you a dashboard error without a proper remap?
yes
 
  #6  
Old 03-29-2019, 06:25 PM
Tigger2011
Tigger2011 is offline
Prototype-R
iTrader: (1)
Join Date: Jul 2013
Location: Sunrise, FL
Posts: 1,301
Received 114 Likes on 84 Posts
You should have no issues with boost spike going catless. It's common on Subaru's but BMW's control method is different. The racechip is the wildcard. Normally with the stock tune you lose a little bottom end but pick it up on top. With a proper tune its power across the board.
 
  #7  
Old 04-04-2019, 04:06 AM
Floydian
Floydian is offline
Neutral
Thread Starter
Join Date: Mar 2019
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by PEneoark View Post
Have you tried a BMW forum?
No. Information on the N13/N18 is far more extensive here.

Originally Posted by knt View Post
Won't running a catless downpipe give you a dashboard error without a proper remap?
Yes it will, thats why I am planning to cancel any error codes from the downstream 02 sensor.

Originally Posted by Tigger2011 View Post
You should have no issues with boost spike going catless. It's common on Subaru's but BMW's control method is different. The racechip is the wildcard. Normally with the stock tune you lose a little bottom end but pick it up on top. With a proper tune its power across the board.
Thanks!
 
  #8  
Old 04-04-2019, 04:08 AM
Floydian
Floydian is offline
Neutral
Thread Starter
Join Date: Mar 2019
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Does anybody know if the downstream narrowband O2 sensor effect AFR and fuel trims on the N18 engine?
 
  #9  
Old 04-04-2019, 06:34 AM
njaremka's Avatar
njaremka
njaremka is offline
6th Gear
Join Date: Jul 2016
Location: Connecticut
Posts: 1,422
Received 160 Likes on 140 Posts
Originally Posted by Floydian View Post
Does anybody know if the downstream narrowband O2 sensor effect AFR and fuel trims on the N18 engine?
It does not. It's sole reason for existing is to monitor the cat efficiency.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
inimmini
Stock Problems/Issues
1
05-07-2012 09:42 AM
thestiguy
R56 :: Hatch Talk (2007+)
3
04-08-2007 06:39 AM
autoxguy305
Drivetrain (Cooper S)
26
12-14-2006 08:49 AM
MarioKart
Drivetrain (Cooper S)
25
11-27-2006 10:17 AM
DarkMiniCooperS
Drivetrain (Cooper S)
23
09-16-2005 11:33 AM


Thread Tools
Search this Thread
Quick Reply: Drivetrain Downpipes (Overboost?)


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: