IAC steps Vs. effective area table in HP tuners pro.
09-20-2008, 01:27 PM
#1
IAC steps Vs. effective area table in HP tuners pro. I ask these questions according to what i read in
the LS1_Tuning_Info_1.40r.doc <========if any one knows about this LS1 tuning document and how good it is i want to know? .
I’m near of beginning tuning the idle of my car (2000 LS1 M6 camaro) and I have some questions :
a- for adjusting IAC steps Vs. effective area :
1- are you sure that when the idle desired airflow is smaller than dynamic airflow you adjust the IAC steps Vs. effective area table to right?
OR
I adjust the table to the right when the dynamic airflow is smaller than idle desired airflow?
2- Can you state the reason why when one is smaller than the other I adjust the table to right?
3- how to adjust running airflow after I adjust the IAC steps Vs. effective area table to the right?
b- for tunning the IAC steps Vs. effective area and airflow :
1- when the idle desired airflow is more than the dynamic airflow I will increase the IAC steps by certain value according to the variance between IDAF (idle desired airflow) and DAF (dynamic airflow) and when DAF is more than IDAF I lower the IAC steps, is that correct?
2- how to increase/decrease the IAC steps? What table I have to go to to increase/decrease IAC steps? Maybe it would be the IAC steps Vs. effective area table? But how do I know where I have to adjust IAC steps?
Sorry if the message is long but I have to ask these questions to make sure I tune my car’s PCM right.
Thanks.
the LS1_Tuning_Info_1.40r.doc <========if any one knows about this LS1 tuning document and how good it is i want to know? .
I’m near of beginning tuning the idle of my car (2000 LS1 M6 camaro) and I have some questions :
a- for adjusting IAC steps Vs. effective area :
1- are you sure that when the idle desired airflow is smaller than dynamic airflow you adjust the IAC steps Vs. effective area table to right?
OR
I adjust the table to the right when the dynamic airflow is smaller than idle desired airflow?
2- Can you state the reason why when one is smaller than the other I adjust the table to right?
3- how to adjust running airflow after I adjust the IAC steps Vs. effective area table to the right?
b- for tunning the IAC steps Vs. effective area and airflow :
1- when the idle desired airflow is more than the dynamic airflow I will increase the IAC steps by certain value according to the variance between IDAF (idle desired airflow) and DAF (dynamic airflow) and when DAF is more than IDAF I lower the IAC steps, is that correct?
2- how to increase/decrease the IAC steps? What table I have to go to to increase/decrease IAC steps? Maybe it would be the IAC steps Vs. effective area table? But how do I know where I have to adjust IAC steps?
Sorry if the message is long but I have to ask these questions to make sure I tune my car’s PCM right.
Thanks.
Last edited by Abdullah; 09-20-2008 at 01:33 PM.
09-20-2008, 02:15 PM
#2
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The IAC steps vs effective area table, is for modeling the -real-
IAC airflow based on the physical dimensions of the IAC port in
the throttle body. The only reason to change it, is when you
modify the TB. For example I found after porting and eopxying
my stocker, I did not get as much air at higher step-counts
because the hole I drilled in the epoxy was much smaller than
the original channel. The right answer in this case was to get
out a bigger drill bit.
In no case should you need to mess with the low end of the
table, which is dominated by the action of the IAC plunger.
You want to work on it from the demand / command side,
not mess around with the model sorts of data unless you
are sure this (mismatch of hardware to model) is in the mix.
Like if you have no hole in the throttle plate where there was
one before, you would need to represent that (or, better in
my opinion, drill an exactly equal sized one in the new piece).
You should use the base running airflow table to adjust the
air targets for normal warmed-up operation, then move on
to dealing with the cold and startup.
IAC airflow based on the physical dimensions of the IAC port in
the throttle body. The only reason to change it, is when you
modify the TB. For example I found after porting and eopxying
my stocker, I did not get as much air at higher step-counts
because the hole I drilled in the epoxy was much smaller than
the original channel. The right answer in this case was to get
out a bigger drill bit.
In no case should you need to mess with the low end of the
table, which is dominated by the action of the IAC plunger.
You want to work on it from the demand / command side,
not mess around with the model sorts of data unless you
are sure this (mismatch of hardware to model) is in the mix.
Like if you have no hole in the throttle plate where there was
one before, you would need to represent that (or, better in
my opinion, drill an exactly equal sized one in the new piece).
You should use the base running airflow table to adjust the
air targets for normal warmed-up operation, then move on
to dealing with the cold and startup.
