Chip Changes during Dyno Tuning
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Joined: Sep 2003
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From: On a dragstrip Thrashin' hell out of it...
Originally Posted by DOCTOR J
A narrative recently prepared for a fellow new to tuning is located here
(with even more references):
http://forums.corvetteforum.com/show....php?t=1069644
I'd modestly suggest reviewing the parts about 'getting the low-speed
fuel tables in good working order FIRST, before doing the WOT tables'.
In my experience, it's generally true that if the foundations are correct,
the high-speed fuel will sort itself out with little further anguish.
The reasons for this are several, but I'll burden you with only one now:
In most GM programs, PE and AE are ADDERS to the base fuel term.
(The equation for fuel load was given in a previous reference.)
That is, in the PE vs. CT and PE vs. PRM tables, GM typically adds ~ 25%
EXCESS fuel to the BASE engine load (or some number like that). Thus
if the base fuel calculation is reasonably correct (VE tables) - there is
scant danger of the engine running lean. Hence there will be less need
to fret over where the 'BLMs are locking' - since the BLMs will already
be ipso facto in the proper range.
Good luck with your project.
(with even more references):
http://forums.corvetteforum.com/show....php?t=1069644
I'd modestly suggest reviewing the parts about 'getting the low-speed
fuel tables in good working order FIRST, before doing the WOT tables'.
In my experience, it's generally true that if the foundations are correct,
the high-speed fuel will sort itself out with little further anguish.
The reasons for this are several, but I'll burden you with only one now:
In most GM programs, PE and AE are ADDERS to the base fuel term.
(The equation for fuel load was given in a previous reference.)
That is, in the PE vs. CT and PE vs. PRM tables, GM typically adds ~ 25%
EXCESS fuel to the BASE engine load (or some number like that). Thus
if the base fuel calculation is reasonably correct (VE tables) - there is
scant danger of the engine running lean. Hence there will be less need
to fret over where the 'BLMs are locking' - since the BLMs will already
be ipso facto in the proper range.
Good luck with your project.
