trying to update MAF tables for 85mm but freq limit is 67
05-21-2015, 06:24 AM
#1
trying to update MAF tables for 85mm but freq limit is 67 1998 fbody. Hz only goes up to 11,250 (newer cars go higher).
Airflow in the table doesn't let me enter anything higher than 67.7.
how do you get around that?
seems like the tables to update to are way higher:
http://www.ls1howto.com/index.php?article=25
thanks.
Airflow in the table doesn't let me enter anything higher than 67.7.
how do you get around that?
seems like the tables to update to are way higher:
http://www.ls1howto.com/index.php?article=25
thanks.
09-14-2015, 08:43 AM
#4
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The table is in Lb/Min. I just cant enter values above 67.725 in the 10,500hz and up fields.
09-14-2015, 10:53 AM
#5
Go back and reread my post. I am aware you're in lb/min, thats why you can't copy the table from ls1howto. You need to go into your settings and change it so the table is in grams/sec. As a separate comment, 67.7 lb/min of airflow is the hardcoded limit in the PCM for 98's.
09-14-2015, 12:20 PM
#6
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Go back and reread my post. I am aware you're in lb/min, thats why you can't copy the table from ls1howto. You need to go into your settings and change it so the table is in grams/sec. As a separate comment, 67.7 lb/min of airflow is the hardcoded limit in the PCM for 98's.
I dont see how I can change the table to grams/sec. How do I do that?
My car is a '99 and it is looking to me like the 67.7lb/min is hardcoded limit for me too...
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09-14-2015, 09:03 PM
#8
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My 600HP+ LS3 stroker uses a card-style MAF inside a 4" intake system.
Recently, near peak torque, running an airmass of 1.05g/sec/cycliner, I only hit 9000 hz corresponding to 50 lb/min or 390 g/sec.
So I am only at 75% of the capacity of a 411 PCM.
Looking at an old 2011 log file with my 500HP LS2 with stock MAF, I see a max of 9900HZ and 47.4 lb/min.
Therefore I think that 67 lb/min should be good for 700+ HP.
After that you can "scale" various tables in the tune to get an even high fuel rate.
How much power are you expecting to make?
Recently, near peak torque, running an airmass of 1.05g/sec/cycliner, I only hit 9000 hz corresponding to 50 lb/min or 390 g/sec.
So I am only at 75% of the capacity of a 411 PCM.
Looking at an old 2011 log file with my 500HP LS2 with stock MAF, I see a max of 9900HZ and 47.4 lb/min.
Therefore I think that 67 lb/min should be good for 700+ HP.
After that you can "scale" various tables in the tune to get an even high fuel rate.
How much power are you expecting to make?
09-15-2015, 06:42 AM
#9
My 600HP+ LS3 stroker uses a card-style MAF inside a 4" intake system.
Recently, near peak torque, running an airmass of 1.05g/sec/cycliner, I only hit 9000 hz corresponding to 50 lb/min or 390 g/sec.
So I am only at 75% of the capacity of a 411 PCM.
Looking at an old 2011 log file with my 500HP LS2 with stock MAF, I see a max of 9900HZ and 47.4 lb/min.
Therefore I think that 67 lb/min should be good for 700+ HP.
After that you can "scale" various tables in the tune to get an even high fuel rate.
How much power are you expecting to make?
Recently, near peak torque, running an airmass of 1.05g/sec/cycliner, I only hit 9000 hz corresponding to 50 lb/min or 390 g/sec.
So I am only at 75% of the capacity of a 411 PCM.
Looking at an old 2011 log file with my 500HP LS2 with stock MAF, I see a max of 9900HZ and 47.4 lb/min.
Therefore I think that 67 lb/min should be good for 700+ HP.
After that you can "scale" various tables in the tune to get an even high fuel rate.
How much power are you expecting to make?
09-21-2015, 09:14 PM
#10
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Ddnspider is right. You are using the wrong units. You need grams/sec
Just right click in the table and at the bottom I think it says units or options or so. Click on it and close to the bottom you will see grams/sec
Just right click in the table and at the bottom I think it says units or options or so. Click on it and close to the bottom you will see grams/sec
