E90Post
 


European Auto Source
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Race Fuel - 100 Octane



Reply
 
Thread Tools Search this Thread
      05-10-2007, 01:52 AM   #1
SROC3
The limit of adhesion is my home.
 
SROC3's Avatar
 
Drives: 2012 E92 M3 JTBLK ZCP
Join Date: Sep 2006
Location: three.one.zero

Posts: 1,385
iTrader: (0)

Garage List
2012 BMW M3  [0.00]
Send a message via Yahoo to SROC3
Race Fuel - 100 Octane

Does this help any? I put 2 gallons in my car today and gunned it around.....runs smoother? or am I imagining this? Does the stock computer adjust automatically? Some say yes and some say no.....I figured in this area of the forum I would get a more directed answer.
__________________
2012 M3 E92 Jet Black
Black Leather/DCT | ZCP |
(Buy date 11/27/11) 2012 M3 E92 Jet Black
Red Extended Leather/6MT | Comp Package - RETIRED
(Impulse Buy Date - 11/22/06) 335i E92/Space Grey/ Red Leather/6MT - RETIRED
SROC3 is offline   United_States
0
Reply With Quote
      05-10-2007, 02:22 AM   #2
SoCal335i
Banned
 
Drives: 2007 E92-TT Jet Blk Coral Red
Join Date: Jan 2007
Location: Cali

Posts: 771
iTrader: (2)

Quote:
Originally Posted by SROC3 View Post
Does this help any? I put 2 gallons in my car today and gunned it around.....runs smoother? or am I imagining this? Does the stock computer adjust automatically? Some say yes and some say no.....I figured in this area of the forum I would get a more directed answer.
You'll always get more power from better octane! Even stock.
SoCal335i is offline  
0
Reply With Quote
      05-10-2007, 05:54 AM   #3
Railgun
Major
 
Railgun's Avatar
 
Drives: FD, CBR600RR, Frmr E92 335i :(
Join Date: Mar 2007
Location: London

Posts: 1,321
iTrader: (2)

Send a message via ICQ to Railgun Send a message via AIM to Railgun Send a message via MSN to Railgun Send a message via Yahoo to Railgun Send a message via Skype™ to Railgun
Not if you're tuned for 93. Gains, if any will be marginal at best and any feeling of more power will most likely be a placebo effect.
Railgun is offline   United Kingdom
0
Reply With Quote
      05-10-2007, 07:36 AM   #4
scalbert
Major General
 
scalbert's Avatar
 
Drives: '08 E90 M3, '13 Volt, '08 Ody
Join Date: Feb 2007
Location: Woodstock, GA

Posts: 5,697
iTrader: (7)

It depends on what the timing limit is. I suspect that in the summer you would benefit more from higher octane than in the winter. In cooler weather the car can run more timing on a given octane. But at some point there will be a maximum amount of timing the ECU will allow.

For instance, assume 25 degrees timing was the maximum and you could hit that on 93 octane in 20 degree weather without knock. At this point higher octane fuels will provide no benefit. In fact, the lower BTU content could cause a power reduction. Now, in 100 weather on 93 octane the best you manage is getting to 20 degrees timing before inducing knock. Add some 100 octane during the summer and you may get back to hitting that 25 degree maximum timing limit.

This is just an analogy and the numbers are not correct but possibly not too far off. It should also be noted that even if the advance was the same at 25 degrees, the vehicle in the 20 degree F temps would still be pulling faster even though it is on lower octane.
scalbert is offline  
0
Reply With Quote
      05-10-2007, 11:17 AM   #5
SROC3
The limit of adhesion is my home.
 
SROC3's Avatar
 
Drives: 2012 E92 M3 JTBLK ZCP
Join Date: Sep 2006
Location: three.one.zero

Posts: 1,385
iTrader: (0)

Garage List
2012 BMW M3  [0.00]
Send a message via Yahoo to SROC3
interesting answers. Definitely better insight. thanks guys!!!!!
__________________
2012 M3 E92 Jet Black
Black Leather/DCT | ZCP |
(Buy date 11/27/11) 2012 M3 E92 Jet Black
Red Extended Leather/6MT | Comp Package - RETIRED
(Impulse Buy Date - 11/22/06) 335i E92/Space Grey/ Red Leather/6MT - RETIRED
SROC3 is offline   United_States
0
Reply With Quote
      05-10-2007, 11:31 AM   #6
Ryan(e92)
Captain
 
Drives: SG M6 coupe
Join Date: Oct 2006
Location: Newport Beach

Posts: 704
iTrader: (6)

U live in Cali so adding 100 octane to our 91 octane is beneficial. I wouldnt add more than 4 gallons a tank tho.
Ryan(e92) is offline   United_States
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 10:31 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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