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Idle AFR vs Vac constant ($61)

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Old Apr 19, 2004 | 10:25 PM
  #1  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
Idle AFR vs Vac constant ($61)

Found at location 0x0233 in the $61 code...is this added or subtracted from the AFR calculated using the VE tables?
Thanks!
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Old Apr 20, 2004 | 06:47 AM
  #2  
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Idle AFR vs Vac constant ($61)

Originally posted by jeepguy553
Found at location 0x0233 in the $61 code...is this added or subtracted from the AFR calculated using the VE tables?
Thanks!
The AFR value at 0x0233 is only used in open loop and at idle. It is added to the open loop AFR vs Coolant value. This is instead of the open loop AFR vs Vacuum value which is used during non-idle times.

RBob.
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Old Apr 20, 2004 | 07:49 AM
  #3  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
So changing it won't do a thing for me once the engine is warmed up?
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Old Apr 20, 2004 | 07:57 AM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Originally posted by jeepguy553
So changing it won't do a thing for me once the engine is warmed up?
Once in closed loop it won't do anything.

RBob.
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Old Apr 20, 2004 | 11:08 AM
  #5  
jeepguy553's Avatar
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From: Rockport, TX
Car: 1980 Jeep CJ7
Engine: AMC 360 with GM TBI
Transmission: TF727 set for kill...let's get it on!!!
So all the tuning I have done in the idle area of the VE1 table is valid? Good. That means my nice pretty BLM table is done right...I hope. The range of about 125 to 128 looks good to me. My main idle cell (800rpm x ~40kPa) is sitting solid at 128 and the corresponding INT is at 128 too. The ones around it are 126-128.
i guess I can just play with the Idle AFR vs Vac constant to get the excess fuel out of the startup and warmup period.
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