target air fuel ratio

Reply Subscribe

Thread Tools

Search this Thread

02-14-2006, 11:46 PM

walterrao

Member

Thread Starter

Join Date: Feb 2004

Location: chattanooga

Posts: 104

Likes: 0

Received 0 Likes on 0 Posts

Car: 91 RS

Engine: vortec 355 hsr

Transmission: wct5

Axle/Gears: bg3.27

target air fuel ratio

my question is if i add or subtract fuel from the VE table the ECM will simply add BLM's to keep the AFR at 14.7:1 right??
... And if so how do i change the ecm's target AFR. I am using CATS tuner V.2.08 And have a tbi 8746 ECM

Reply Like

02-15-2006, 11:49 AM

anesthes

TGO Supporter/Moderator

iTrader: (12)

Join Date: Jul 1999

Location: SALEM, NH

Posts: 11,736

Likes: 0

Received 89 Likes on 75 Posts

Car: '88 Formula, '94 Corvette, '95 Bird

Engine: LC9, 355" LT1, LT1

Transmission: T5, Zf6, 4L60E

Axle/Gears: 3.42, Dana44 3.45, 3.23

Re: target air fuel ratio

Quote:

Originally posted by walterrao
my question is if i add or subtract fuel from the VE table the ECM will simply add BLM's to keep the AFR at 14.7:1 right??
... And if so how do i change the ecm's target AFR. I am using CATS tuner V.2.08 And have a tbi 8746 ECM

Target AFR will be 14.7: in closed loop everywhere but AE/PE.

Target AFR will also be nothing close to true AFR

-- Joe

Reply Like

02-15-2006, 03:51 PM

Ronny

TGO Supporter

iTrader: (1)

Join Date: Mar 2003

Location: wisconsin

Posts: 6,879

Likes: 0

Received 2 Likes on 2 Posts

TC told me that you can alter the A/F somewhat, a little, in the constants. it is the stoich A/F in constants. i have no emmishions so i moved it to 14.3 for CL. now i am running OL as an experiment 1/2 of last season at 122-126 blms in tune and on WB it is like 14.00-14.500 cruising and 13.00/1 at idle. seems to like a rich idle. idle exhaust has no odor and is clean. tip in improved too. overall drivability is better. fuel mileage may not be.