Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Part throttle fueling...........

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Old Jun 21, 2009 | 09:22 AM
  #1  
MichiganSkip's Avatar
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From: Three Oaks MI
Part throttle fueling...........

How do you guys attemp part throttle fueling?

LT1/TC, closed loop. Seems the only way would be to change the maf settings at part throttle. I wondered if anyone did it another way
Old Jun 21, 2009 | 11:03 AM
  #2  
Stl94LT1's Avatar
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From: O'Fallon, MO
If you want to change a specific rpm range, yes you can make adjustments to the MAF tables. To make global changes you can adjust up/down the injector constant.
Old Jun 21, 2009 | 02:35 PM
  #3  
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From: Engineerland
Only do it after you have driven the car around for a bit so it can learn. Then only make adjustments after several seconds of sustained throttle and airflow. Do not make adjustments based on deceleration or just loafing along with no throttle input. If you follow that advice it will come around much more quickly. All you do is move the airflow around to whatever the trims suggest.

First thing I would do though is put it in speed density and get the ve table worked out with ve master. It shouldnt be referenced in maf mode but sometimes it can make the blms a bit more stable. Besides if you maf ever craps out on you it'll still be tuned up.
Old Jun 23, 2009 | 03:24 PM
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MichiganSkip's Avatar
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Thanks, I 'studied" going that route with tweaking the maf tables about 5 years ago. I was told that I'd have to make the changes for a particular spot by spreading out the changes over a larger area. I even made an excel spreadsheet where I could plug in a number and it would calculate and change the settings over a 20 cell spread. Never got around to trying it though. I just wondered what you guys did to say, richen up the afr at cruise.
Thanks
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