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Senior Tuner
Stall saver strategy??
just looking for some insights on to what this table does...
what values to put in...and what higher or lower values do...
wanting to know exactly what stall saver strategy is in as much detail as possible
please give me an example of why to use this tables as well and what it is best used for
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HP Tuners Owner
Stall saver invokes the derivative airflow at the maximum level if the RPM drops below the threshold set. It also disengages the AC clutch if the AC is on.
This gives an instant boost to the IAC to try and prevent a stall.
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Senior Tuner
so a smart way to populate the table is to tell it an RPM value less than the table value???
meaning idles at 1000....
set 800 to 600
set 600 to 400
set 400 to 300
something like that??
telling the pcm if Idle drops below 600 to get it back up to 800??
and hopefully that will be enoug for it to recover gracefully??
am I looking at this te right way??
thinking of it as a safety catch??
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HP Tuners Owner
yes, although generally the derivative and proportional airflow would have already kicked in if the RPM dropped quickly below the desired idle RPM. A lot of cals don't use the stall saver.
Chris..
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Advanced Tuner
An alternative is to jack up your cracker flow in the 400RPM column to something around 1.0g/sec from 6kph. Note that idle adaptive control will not enable unless travelling less than 3kph (default) so if you have a tendency to stall when coming to a stop, stall saver isnt going to help you.
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Tuner
So I had this same question and did some searching. I found a handful of threads like this one -- people asking what it's for, others speculating about how it's maybe supposed to be used, and the final answer being "don't use it, you want to do X instead."
So, what is it for? If I shouldn't use it, why is it in the software?
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Advanced Tuner
Keep it active, dont use it for a bandaid. I had a truck come in from a big name shop with the ac not working. A full retune from scratch fixed all idle issues and i was blowing the cold ac while retuning it.
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Tuner
Okay, but what is it for? And what do the values mean? If I put 400 in the 600 column, under what circumstances does that value get used, and how?