Air/Fuel Ratio
Thread Starter
Member
Joined: Dec 2001
Posts: 148
Likes: 0
Air/Fuel Ratio
What should the air/fuel ratio be? My http://www.nordskogperformance.com guage says that Stoich is 14.7/1. Is this true?
Supreme Member
Joined: Jul 1999
Posts: 2,149
Likes: 4
From: Mims, Florida
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Yes, the perfect air/fuel ratio is 14.7:1
However, the fuel never gets mixed in perfectly to burn all of the oxygen. Therefore, typically you need to run a little rich to burn all of the oxygen to develop max torque and Hp. So you should be running between 12.7 and 13.3:1 for best WOT performance.
For normal cruising around, 14.7:1 is just fine for better fuel economy, even leaner like 15.5:1 is OK.
However, the fuel never gets mixed in perfectly to burn all of the oxygen. Therefore, typically you need to run a little rich to burn all of the oxygen to develop max torque and Hp. So you should be running between 12.7 and 13.3:1 for best WOT performance.
For normal cruising around, 14.7:1 is just fine for better fuel economy, even leaner like 15.5:1 is OK.
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Re: Air/Fuel Ratio
Originally posted by 89_RS_Mike
What should the air/fuel ratio be? My http://www.nordskogperformance.com guage says that Stoich is 14.7/1. Is this true?
What should the air/fuel ratio be? My http://www.nordskogperformance.com guage says that Stoich is 14.7/1. Is this true?
If you want a lean cruise of like mid 16s will get you better mileage.
WOT tuning is about finding what your engine combo wants.
BTW, the oem ecm toggles the AFR so that the AVERAGE is 14.7. I has to cycle rich and lean to keep the converter working
Thread
Thread Starter
Forum
Replies
Last Post
Damon
Tech / General Engine
8
Sep 26, 2015 04:29 PM
83 Crossfire TA
Suspension and Chassis
6
Sep 18, 2015 12:01 PM
83 Crossfire TA
Suspension and Chassis
0
Sep 8, 2015 12:06 PM
