Tuning in Open Loop for Newby
WEG1192 at aol.com
WEG1192 at aol.com
Wed Aug 23 18:39:59 GMT 2000
After reviewing a bunch of EPROM bins, I have a question about tuning. My
understanding is that the tuning is for closed loop operation. But to tune,
you set the closed loop enable temp way high to keep the ECM from entering
closed loop. So now, are you tuning in open loop or closed loop? If open loop
is nothing more than the closed loop tables without O2 feedback, what are all
the open loop AFR correction vs. MAP and AFR correction vs. coolant temp
tables for? Seems to me that these tables would interfere with proper tuning
for closed loop operation. If you tune with those corrections applied, and
then you drive in closed loop, seems that your tuning would be inaccurate?
Also, it was mentioned a while back that setting ignition timing advance to
just before knock occurs at all RPMs is not always the best setting. If
that's the case, what criteria is used as your tuning goal? Best acceleration
under WOT? Best mileage? Etc.
Thanks
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