Tuning for fuel cell transitions
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Joined: Dec 2001
Posts: 1,997
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From: Bartlett, IL
Car: 92 ZR-1
Engine: LT-5
Transmission: ZF-6
Axle/Gears: SuperDana 44 4.10
Tuning for fuel cell transitions
Curious how some of the more experienced tuners deal with
the "in-between" cell calibration. If you see that 1700-1800rpm at 55kPa is running lean, what method do you use to address that? I am addressing myself to the 7747 specifically since the fuel tables aren't as "granular" as I'd like them to be for tuning.
the "in-between" cell calibration. If you see that 1700-1800rpm at 55kPa is running lean, what method do you use to address that? I am addressing myself to the 7747 specifically since the fuel tables aren't as "granular" as I'd like them to be for tuning.
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Re: Tuning for fuel cell transitions
Originally posted by Dominic Sorresso
Curious how some of the more experienced tuners deal with
the "in-between" cell calibration. If you see that 1700-1800rpm at 55kPa is running lean, what method do you use to address that? I am addressing myself to the 7747 specifically since the fuel tables aren't as "granular" as I'd like them to be for tuning.
Curious how some of the more experienced tuners deal with
the "in-between" cell calibration. If you see that 1700-1800rpm at 55kPa is running lean, what method do you use to address that? I am addressing myself to the 7747 specifically since the fuel tables aren't as "granular" as I'd like them to be for tuning.
Or is it just cause the number wander from 128.
If the car is running fine, leave it along, and move on.
If the car is running bad the add fuel to the area that makes the best improvment.
Thread Starter
Supreme Member
Joined: Dec 2001
Posts: 1,997
Likes: 12
From: Bartlett, IL
Car: 92 ZR-1
Engine: LT-5
Transmission: ZF-6
Axle/Gears: SuperDana 44 4.10
Bruce,
Yes. I have been hunting down a transient INT while tuning. In particular it happens when I am in OD (4+3 trans) and at 1600rpm or so. Seems like I have a "knee" at that point of the fuel curve. As the rpm transition between 1600 to 1700 rpm the MAP will increase from 1.8 to 2.4v or from 45kPa to 60kPa, and the INT will spike up to 145 or so, then it'll settle back down to 128-132 and the MAP will drop back down. I have been playing with the AE x Diff MAP and a bit with the AE x Diff TPS%.
Car continues to run just fine. No additional spark counts show up. On flat road, its fine. I have been using inclines and declines to tune parts of the fuel map that won't necessarily show up in constant cruise.
Thanks for the answer Bruce. Now I can spend my evenings with the family instead of going out for midnight rides scanning the motor.
Yes. I have been hunting down a transient INT while tuning. In particular it happens when I am in OD (4+3 trans) and at 1600rpm or so. Seems like I have a "knee" at that point of the fuel curve. As the rpm transition between 1600 to 1700 rpm the MAP will increase from 1.8 to 2.4v or from 45kPa to 60kPa, and the INT will spike up to 145 or so, then it'll settle back down to 128-132 and the MAP will drop back down. I have been playing with the AE x Diff MAP and a bit with the AE x Diff TPS%.
Car continues to run just fine. No additional spark counts show up. On flat road, its fine. I have been using inclines and declines to tune parts of the fuel map that won't necessarily show up in constant cruise.
Thanks for the answer Bruce. Now I can spend my evenings with the family instead of going out for midnight rides scanning the motor.
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