Exhaust ? - BMW G310 R/GS Forum
 19Likes
Reply
 
LinkBack Thread Tools
post #1 of 118 (permalink) Old 10-10-2017, 09:39 AM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
Exhaust ?

Just ordered the Akrapovic carbon fiber full race exhaust without the cat. The Akrapovic cf exhaust is 10 lbs lighter than stock.
Tactical_r3dn3ck is offline  
Sponsored Links
Advertisement
 
post #2 of 118 (permalink) Old 10-10-2017, 01:43 PM
Member
 
luckmeister's Avatar
 
Join Date: Oct 2017
Location: Netherlands
Posts: 58
Garage
Nice!, get your earplugs out, it will be loud
luckmeister is offline  
post #3 of 118 (permalink) Old 10-10-2017, 06:25 PM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
Also does anyone here have this exhaust already and from what I understand you do not have to tune or use a fuel management system. So just disconnect the battery for a few minutes and reconnect to reset the ecu?
Tactical_r3dn3ck is offline  
post #4 of 118 (permalink) Old 10-10-2017, 07:01 PM
Senior Member
 
Join Date: Sep 2017
Location: Northern Waitakeres, New Zealand
Posts: 142
Quote:
Originally Posted by Tactical_r3dn3ck View Post
from what I understand you do not have to tune or use a fuel management system.
The specs on the BMW website say that the emissions system is closed loop (needs to be with a 3 way cat), so it should be constantly fine tuning the fuelling to stay at the right air fuel ratio to keep the cat working at maximum efficiency. If systems haven't changed since I last delved in to this kind of thing, the ECU will have a base map for the fuelling covering the speed and load range, and with feedback from the O2 sensor it will fine the map if it stays operating at any one condition for long enough. What you don't know is whether BMW has bounds set on the amount of tuning within that map that is possible - eg the new exhaust could change the fuelling to get to stoichiometric by more than amount of fine tuning the closed loop system can achieve (but as the new exhaust does not have a 3 way cat, that isn't really so much of a bother).
I would think the exhaust manufacturers would know the answer though....
NZWestie is offline  
post #5 of 118 (permalink) Old 10-10-2017, 07:34 PM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
This was on the website.
Attached Thumbnails
Click image for larger version

Name:	Screenshot_20171010-183238_1507678438126.png
Views:	713
Size:	265.7 KB
ID:	1697   Click image for larger version

Name:	Screenshot_20171010-183311_1507678447826.png
Views:	635
Size:	209.6 KB
ID:	1705  
Tactical_r3dn3ck is offline  
post #6 of 118 (permalink) Old 10-10-2017, 07:37 PM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
The Sales Manager at the dealer I bought from was telling me about the exhaust available for it and said he was anxious to hear one with it installed.
Tactical_r3dn3ck is offline  
post #7 of 118 (permalink) Old 10-10-2017, 07:55 PM
Senior Member
 
Join Date: Sep 2017
Location: Northern Waitakeres, New Zealand
Posts: 142
Quote:
Originally Posted by Tactical_r3dn3ck View Post
This was on the website.
That bit where it says

Quote:
"No fuel remapping required, but for optimal performance RevZilla recommends use of a fuel controller"
suggests that the closed loop control on the bike still has ability to tune the mixture - but while stoichiometric keeps the cat working at max efficiency, it means it doesn't allow lean off for economy or going richer for WOT power... hence their recommendation to get the most out of their exhaust.

That would be my understanding anyway...
NZWestie is offline  
post #8 of 118 (permalink) Old 10-10-2017, 08:12 PM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
It said the same for the Stainless Steel model with the cat also.
Tactical_r3dn3ck is offline  
post #9 of 118 (permalink) Old 10-10-2017, 10:25 PM
Senior Member
 
Join Date: Sep 2017
Location: Northern Waitakeres, New Zealand
Posts: 142
Quote:
Originally Posted by Tactical_r3dn3ck View Post
It said the same for the Stainless Steel model with the cat also.
It's possibly a standard statement they use for all their systems - which would make sense. For a 3 way cat, to pass emissions regs, the fuel air ratio must be tightly controlled - but if there are no requirements or rules to pass the need to keep a cat working at its maximum efficiency is no longer vital, it will still reduce emissions with non-ideal fuel air ratios but just not as much as it is capable of.
NZWestie is offline  
post #10 of 118 (permalink) Old 10-11-2017, 11:53 AM Thread Starter
Senior Member
 
Tactical_r3dn3ck's Avatar
 
Join Date: Sep 2017
Posts: 340
Shipped this morning will arrive Friday. I can't wait!
Tactical_r3dn3ck is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
2017 G310R - faulty baffle inside exhaust Ken Engines and Technical Discussion 9 05-28-2019 09:39 PM
Exhaust header wrap porth Appearance Modifications 9 06-04-2018 07:12 PM
BMW G310R Arrives! Wife overall NOT happy. schwa99x 2017+ BMW G310R / G310GS: Likes And Dislikes 24 01-14-2018 11:29 AM
Exhaust options majm6 Appearance Modifications 100 08-23-2017 05:04 AM
G310R Exhaust Sound EvryDayRide BMW G310R Pictures And Videos 10 08-29-2016 10:06 AM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome