air temp compensation on fuel maps question - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 06-24-04, 04:37 AM Thread Starter
tgoodlich@hotmail*****
 
Join Date: Jul 2003
Location: Perth WA
Posts: 381
air temp compensation on fuel maps question

As the air temp increases do I richen or lean off the fuel maps. I think as air gets less dense as the air temp increases then less air molecules in the air then less fuel is required to be injected. Am I right???
turbotrana is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 06-24-04, 07:18 AM
BattensPerformanceTuning
 
GT-P's Avatar
 
Join Date: Oct 2002
Location: Perth W.A.
Posts: 446
Re: air temp compensation on fuel maps question

Quote:
Originally Posted by turbotrana
As the air temp increases do I richen or lean off the fuel maps. I think as air gets less dense as the air temp increases then less air molecules in the air then less fuel is required to be injected. Am I right???
Leaning out the Fuel could cause possible detonation condtion. Rather, it may need to have timing retarded to scale. or add fuel.

Also known as edxr8ebgt, BA GT #16, Blueprint, Premium Sound, Leather.
GT-P is offline  
post #3 of 5 (permalink) Old 06-24-04, 10:09 AM Thread Starter
tgoodlich@hotmail*****
 
Join Date: Jul 2003
Location: Perth WA
Posts: 381
Re: air temp compensation on fuel maps question

The timing/temp relationship is generally to retard as air temp goes up on hot summer days, but what I am trying to clarify is how temp extremes from 10deg to 40deg+ air intake affect the fuel ratio.
turbotrana is offline  
post #4 of 5 (permalink) Old 06-28-04, 04:47 AM
Registered User
 
Martin's Avatar
 
Join Date: Feb 2001
Location: NSW/ACT
Posts: 3,023
Re: air temp compensation on fuel maps question

Isnt the hotter the intake temp the more likely it is to pre-ignite? On a 40C day the intake temp could be atleast double that.
So you add more fuel to prevent that?

1993 ED XR6 M5 (1 of 329)
Polynesian Green
Turbo on the way!!
1993 EBII Fairmont (Now wrecking, PM if you want any parts)
1988 Nissan R31 Skyline
Martin is offline  
post #5 of 5 (permalink) Old 06-28-04, 07:27 AM Thread Starter
tgoodlich@hotmail*****
 
Join Date: Jul 2003
Location: Perth WA
Posts: 381
Re: air temp compensation on fuel maps question

Hi Martin,
Rang EMS today. I was right, for fuel map air temp compensation you need to increase fuel slightly as temp goes down (martin this is assuming that the A/F ratio is correct at 40 deg. In that instance you quote you would retard timing to prevent detonation and you would do this in the air temp compensation of the ignition map i.e decrease ign timing as air temp goes up. This is a good feature to use) cause the air is more dense with more oxygen, hence more fuel can go in. This temp comp thing is not really that important as it is really for very very fine tuning.
By the way Martin, the turbo setup that I'm doing is nearly ready, just waiting on the wastegates from turbonetics as they are completely out of stock of racegates. When finished will send pic.
Your EMS8860 will have a Autotune function soon. I'm actually getting the software to test but it should be available in the next few months. This is a huge step for a EMS in this price range. Stay tuned (pardon the pun)
turbotrana is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech
Gear in this thread - Powered by O'Reilly Auto Parts


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
U.S.A.:World's most advanced fuel station opens in San Diego Stacy94PGT Ford Worldwide News 0 08-31-03 08:14 AM
2005 Ford Gt: An American Supercar Is Reborn RPO83 Ford GT40 | Ford GT 8 06-14-03 07:44 AM
Understanding Engine Management - Part 1 Dan [Sac] V6 and Hot4 Tech 0 12-11-01 02:08 PM
blown airbag and fuel boutout question prob93 Ford Probe Forum | Mazda MX6 Forum 4 12-01-01 11:20 PM
Ford V8's jaytyn The Pub 8 08-28-01 05:42 PM

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