AFR targets for 98octane pump fuel - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

MEGAsquirt A place to collectively sort out this megasquirt gizmo

LinkBack Thread Tools
Old 01-20-2014, 04:11 AM   #1
Thread Starter
Join Date: Sep 2008
Location: Hong Kong
Posts: 9
Total Cats: 0
Default AFR targets for 98octane pump fuel

Hi guys, before i head off to the dyno to tune ignition timing, I would very much like to get my fueling correct first. My current AFR table is pretty much a copy of Braineack's table as shown in and my VE tuning has been based on those targets.

Since pump gas is 98octane here in hong kong, my question is, how much, if at all, leaner should my AFR targets be compared to Brain's. thx.
fdtunea is offline   Reply With Quote
Old 01-20-2014, 08:18 AM   #2
Senior Member
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81

I am also running the European 98Octan fuel and I am using the same AFR targets as anyone else. I don't see a point in running any leaner with this fuel.
Zaphod is offline   Reply With Quote
Old 01-20-2014, 08:37 AM   #3
Junior Member
iTrader: (1)
Join Date: Jul 2011
Location: Trondheim, Norway
Posts: 56
Total Cats: 3

European and US octane numbers are not the same. European are pure research octane numbers, US are the average of research octane and motor octane numbers (RO+MO)/2

Normaly I'd expect to use the same ignition table and fuel for 91 US Octane as 98 European Octane.

PiazzaT is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Yesterday 09:00 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM

Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 03:25 AM.