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

taking out fuel

Old Dec 12, 2004 | 04:59 PM
  #1  
1FASASZ's Avatar
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From: reno, nv
taking out fuel

what tables in tuner cat do i use to take out fuel at wide open throttle? im going to the dyno tomarow with my friend and his 383 ta. any tips for dyno tunning would help
thanks
Old Dec 12, 2004 | 07:13 PM
  #2  
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From: near waco tx.
Re: taking out fuel

%change to fuel/air ratio vs coolant temp at wot

and

%change to fuel/air ratio vs rpm at wot


heres the formula

WOT AFR = 14.7 / (1 + %Change vs Cool/100 + %Change vs RPM/100)

more info from the tuner help file

This table is the percent change to Fuel/Air Ratio used at or near wide-open throttle (WOT) versus coolant temperature. The values from this table and the WOT % Change To Fuel/Air Ratio Vs. RPM are summed to arrive at the WOT Air Fuel ratio.

The resulting air / fuel ratio can be calculated as follows:

WOT AFR = 14.7 / (1 + %Change vs Cool/100 + %Change vs RPM/100)

For the selected RPM, suppose the percent change to Fuel/Air Ratio from the RPM table is = - 5.1 and the percent change to Fuel/Air Ratio from the COOLANT table at the selected coolant temperature is = 22.7, then the approximate WOT AFR would be:

14.7 / (1 -0.051+.227) = 12.5:1 AFR
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