K-Bikes.com - Excellence in Motion K-Bikes.com - Excellence in Motion
Home Forums Files Gallery Email Articles Surveys Calendar Technical

Community Announcements

We know it has been a challenging few years for all of us, but last year was especially challenging for the support of this community. We had some significant expenses, while the support from our membership continues to be significantly smaller than years past. If you appreciate this community and want to see it continue to grow and improve, it is important that you support us through subscriptions. We are only supported by the community and a hand full of supporting dealers and vendors. We have continued to keep this community free of intrusive advertising and banners, unlike most other online communities, but if we cannot pay the bills, we will be forced to look at some sort of advertising in the near future. If you are not a member, please take a moment and purchase a subscription.

Please thank the Vendors and Dealers who support this community by giving them a chance to earn your business.


Welcome to the K-Bikes.com - Excellence in Motion.
The K-Bikes community exists to promote a friendly, on-line community specifically related to BMW's line of K-series motorcycles. The information on this site is primarily related to the BMW's K-based Sport Touring Motorcycles - the BMW K1200RS, K1200GT, K1200S, and K1200R; however, all riders who share many similar interests amongst the larger BMW rider community are welcome to join in on the fun.

If this is your first visit, be sure to check out the FAQ. In order to use most of the features of the site, you must register. To start viewing messages, select the forum that you want to visit from the selection below.

If you have any questions regarding this community, please use the Contact Us form and an we will get back to you ASAP.


Go Back   K-Bikes.com - Excellence in Motion > Bikes > K12/1300S
User Name
Password
Register Site FAQ Calendar Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old Aug 17th, 2006, 5:19 am
ratemut ratemut is offline
Enthusiast
 
Join Date: May 2005
Location: Frankfurt am Main, , Germany
Posts: 273
92 vs 95 vs 98 Octane (ROZ)

BMW say that we should use 98 ROZ and that lower octane reduce power and milage.

But how much reduction is there in reality when using fex. 95 (ROZ) ?

Is it bad for the engine to switch between 98 and 95 (often gas stations don't have 98)

Anybody knows ?

/Michael
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old Aug 17th, 2006, 6:26 am
ManfredH's Avatar
ManfredH ManfredH is offline
Addict
 
Join Date: Aug 2004
Location: Speyer, , Germany
Posts: 434
Quote:
Originally Posted by ratemut
Is it bad for the engine to switch between 98 and 95 (often gas stations don't have 98)l

No. More than half of my 35' km I was driving with 95 octane gas (couldn't get 98). No problem. However, I would not go with 92 exept for a few miles and then fill up wit 95/98 at the next gas station.

Manfred
Reply With Quote
  #3  
Old Aug 17th, 2006, 6:56 am
Lenz Lenz is offline
Enthusiast
 
Join Date: Jun 2005
Location: , ,
Posts: 293
The knock sensors in the engine will adjust ignition timing and other variables to compensate for lower octane fuel. I don't know what the ECU does to sense and fully utilise high octane fuel but the knock sensors deal with low octane / engine pre detonation.
Reply With Quote
  #4  
Old Aug 17th, 2006, 7:48 am
Impulse_Buyer's Avatar
Impulse_Buyer Impulse_Buyer is offline
Junior Member
 
Join Date: Apr 2006
Location: Londonderry, NH, USA
Posts: 37
I've been running 93 in my S without problems. However, I suspect that mixing of gasoline brands is the culprit for intermittent throttle twitchiness - that lightswitch feeling of on or off that it sometimes gets.
__________________
'06 K1200S (Granite Gray)
'95 Ducati Monster 900 (Red)
'98 BMW M3 Coupe (Estoril)
'88 BMW 325ix (Red)
'06 Subaru Impreza 2.5i (Some silly color name that should just be plain dark blue)
Reply With Quote
  #5  
Old Aug 17th, 2006, 11:28 pm
joema's Avatar
joema joema is offline
Senior Member
 
Join Date: Jun 2006
Location: Nashville, TN,
Posts: 149
Quote:
Originally Posted by Lenz
The knock sensors in the engine will adjust ignition timing and other variables to compensate for lower octane fuel. I don't know what the ECU does to sense and fully utilise high octane fuel but the knock sensors deal with low octane / engine pre detonation.

Typically the knock sensors "microphones" are monitored by the ECU, which advances timing (giving more hp) until engine knock. Since lower octane fuel knocks earlier, the ECU hears this and retards timing which cuts hp a little. On the BMW e46 M3 each cylinder has its own knock sensor microphone. Regular cars often have just one or two. Don't know about the K1200S.
Reply With Quote
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
Higher Octane fuels? chilei K1200RS/GT (Classic) 31 Sep 8th, 2006 9:15 pm
Fuel. jack12 K1200RS/GT (Classic) 26 Aug 10th, 2006 12:28 pm
octane level jaysonm K1200RS/GT (Classic) 11 May 4th, 2006 4:12 pm
Gas Papilio Technical, Repair and Maintenance 4 Oct 30th, 2005 1:59 pm
unleaded or premium unleaded Papilio Technical, Repair and Maintenance 2 Oct 25th, 2005 6:53 am


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 6:56 pm.


K-Bikes.com is powered by: vBulletin Version 3.0.9
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2007, Enthusiast Communities, LLC
BMW, K1200, K1200RS, K1200GT, K1200R, K1200S, k-bikes, k-bikes.com, motorcycle, motorcycles, 2006 K1200GT, K-Bikes.com - Excellence in Motion including K1200RS, K1200GT, K1300GT, K1200S, K1300S, K1200R, K1300R motorcycles, BMW Motorrad, BMW Motorcycles, 2006 BMW K1200GT, 2006 BMW K 1200 GT, 2007 BMW K1200GT, 2007 BMW K 1200 GT, 2008 BMW K1200GT, 2008 BMW K 1200 GT, 2009 BMW K1300GT, 2009 BMW K 1300 GT, k12rs, k12gt, k12s, k12r
Spammer's Honeypot