LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

Fwi lean code

Thread Tools
 
Search this Thread
 
Old Jan 1, 2011 | 06:08 PM
  #21  
JDMC5's Avatar
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2009
Posts: 1,366
Likes: 0
From: Highland, MI
Default

I agree, get hptuners. The stuff you listed is easy, the hardest thing on there is tuning the maf, but with some knowledge its easy.

I would probably add to that list: lean out commanded PE a/f ratio and change shift points.
Reply
Old Jan 1, 2011 | 06:20 PM
  #22  
Brian396's Avatar
TECH Enthusiast
iTrader: (3)
 
Joined: Aug 2007
Posts: 749
Likes: 0
From: Ottawa IL
Default

Originally Posted by JDMC5
lean out commanded PE a/f ratio
I havent seen that table? What is it for?
Reply
Old Jan 1, 2011 | 07:07 PM
  #23  
TiredGXP's Avatar
TECH Enthusiast
iTrader: (2)
 
Joined: Dec 2007
Posts: 677
Likes: 0
From: Sherwood Park, AB
Default

It sets the target AFR during high load, open loop operation. (The factory raped to PE table - mine looked like the Rocky Mountains until fixed.) Factory setting gets as rich as ~10.8:1 which is way to rich for best torque.
Reply
Old Jan 1, 2011 | 07:42 PM
  #24  
JDMC5's Avatar
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2009
Posts: 1,366
Likes: 0
From: Highland, MI
Default

he's right, it's basically for when you floor the car, or close to it.

Where have you seen 10.8:1? The worst I've seen is 12.1:1.
Attached Thumbnails Fwi lean code-pe-table.jpg  
Reply
Old Jan 1, 2011 | 08:32 PM
  #25  
TiredGXP's Avatar
TECH Enthusiast
iTrader: (2)
 
Joined: Dec 2007
Posts: 677
Likes: 0
From: Sherwood Park, AB
Default

Originally Posted by JDMC5
Where have you seen 10.8:1? The worst I've seen is 12.1:1.
Brain fart - 12.1 is correct, still too rich though.

10.8 is for the Subie under boost.

Edit:
Here's the current EQ table - equivalent to 12.8
Fwi lean code-eq-table.jpg
Reply
Old Jan 1, 2011 | 09:08 PM
  #26  
Brian396's Avatar
TECH Enthusiast
iTrader: (3)
 
Joined: Aug 2007
Posts: 749
Likes: 0
From: Ottawa IL
Default

Alright the “lean out” thru me off.
Reply
Old Jan 1, 2011 | 09:44 PM
  #27  
JDMC5's Avatar
TECH Fanatic
iTrader: (3)
 
Joined: Feb 2009
Posts: 1,366
Likes: 0
From: Highland, MI
Default

Yeah as far as I know all the LS4's have the same PE fuel curve. At least all the ones I've seen.

Just remember brian, boosted cars like to run more rich than N/A cars. Should be around 11.0-11.5.
Reply




All times are GMT -5. The time now is 11:56 PM.