IAT and ECT tables
04-06-2008, 06:03 PM
#1
IAT and ECT tables I would like to understand these tables and how and why they do what they do and how they interact between them.
How important are these tables?, I have noticed some have these zereoed out and not just for tuning but on there final tune.
The IAT and ECT seem to overlap to a degree at say the 0.60 g/cyl the IAT is subtracting 2* and I know there is a multiplier involved based on rpm and at the same 0.60 g/cyl the ECT is adding 2*,...and then there is the area in the IAT table where at 0.48 g/cyl at 131* it is -4.1* and the next column down at 0.52 g/cyl at 131* again but it is -2*
I would just like to understand these tables better that they pull and add timing based on temp.
I have searched but found little to explain this, can someone please help explain these.
How important are these tables?, I have noticed some have these zereoed out and not just for tuning but on there final tune.
The IAT and ECT seem to overlap to a degree at say the 0.60 g/cyl the IAT is subtracting 2* and I know there is a multiplier involved based on rpm and at the same 0.60 g/cyl the ECT is adding 2*,...and then there is the area in the IAT table where at 0.48 g/cyl at 131* it is -4.1* and the next column down at 0.52 g/cyl at 131* again but it is -2*
I would just like to understand these tables better that they pull and add timing based on temp.
I have searched but found little to explain this, can someone please help explain these.
04-06-2008, 07:54 PM
#2
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Mostly I see the multiplier used as a "gate" or logical AND to
select where the adder is applied and not. If the multiplier is
all either 1.000 or 0.000 this is the evident plan.
Where it becomes useful (for spark) is for things like, you tune
it real tight in early Spring and find you now have highway ping
when passing in the summer. You don't want to mess up the
main tune, use the temp adders to pull out spark where you
need to for the environment (which one is out from when you
tuned originally? Use that one). Good reason to take some
notes while tuning, about conditions - so you don't step on
the original "zone of perfection" but paint around it with the
adders.
select where the adder is applied and not. If the multiplier is
all either 1.000 or 0.000 this is the evident plan.
Where it becomes useful (for spark) is for things like, you tune
it real tight in early Spring and find you now have highway ping
when passing in the summer. You don't want to mess up the
main tune, use the temp adders to pull out spark where you
need to for the environment (which one is out from when you
tuned originally? Use that one). Good reason to take some
notes while tuning, about conditions - so you don't step on
the original "zone of perfection" but paint around it with the
adders.
04-09-2008, 07:30 PM
#3
Thanks Jimmyblue, I have been thinking about this and do you say you should "tune" or "tweek" these tables yourself?
You live in central florida, like me and I would think that we would be getting IAT's of over 100* in town and at idle most of the year and the stock IAT table is pulling timing at 100*, so I am confused and not sure what to do, do I tune my spark with the IAT and ECT tables stock, of turn them off till no KR and then put back to stock...which doesn't make a whole lot of sence to me...just trying to figure these out logically so I can apply this to my spark tuning.
If you could help, it will be much appreciated.
You live in central florida, like me and I would think that we would be getting IAT's of over 100* in town and at idle most of the year and the stock IAT table is pulling timing at 100*, so I am confused and not sure what to do, do I tune my spark with the IAT and ECT tables stock, of turn them off till no KR and then put back to stock...which doesn't make a whole lot of sence to me...just trying to figure these out logically so I can apply this to my spark tuning.
If you could help, it will be much appreciated.
