Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

how to lean out a/f ratio( tunercat MAF tables)

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Old Aug 29, 2003 | 08:28 PM
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Fbody1's Avatar
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From: fl,jax
Question how to lean out a/f ratio( tunercat MAF tables)

in tunercat if I want to lean the a/f ratio out some, do you add # to the maf tables ,or subtract them, car is a little rich ( 910mv to 950mv )@ 5000 to 6200 , and is this the only table to change?
Old Aug 29, 2003 | 11:29 PM
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From: Lockport, Illinois 60441
I would like to know this as well. I start my 95 T/A up and it idles really rich. Dan K. where are ya??? Help us out!!
Old Aug 29, 2003 | 11:38 PM
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Lower the numbers to take fuel out (you're telling it less air is flowing so it puts in less fuel).
Old Aug 30, 2003 | 06:40 PM
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From: fl,jax
lower the # by how much?does 20 gmps make a big differnce, or does 50 or 75 , wich one ? o2 mv @910 to 940 , would like to get them down to 830 to 850 @ peak hp
Old Aug 30, 2003 | 08:50 PM
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If you're talking WOT tuning only, use the "% Change AFR at WOT" or something similar, both vs. RPM and vs. Coolant temp.

Lower the RPM table a good 15-20%, or use the table help to calculate an AFR of around 12.6-13.2:1.
Old Aug 31, 2003 | 02:06 AM
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From: so close I can taste it...
Fbody1...if you're asking about wot fueling than what Solomon told you is dead nuts on. It's all in the "pe" tables or the % change afr vs coolant and vs rpm tables.

EvilZ28...I'm going to check the bin file and datalog you sent me shortly. I will get back to you.
Old Aug 31, 2003 | 02:10 AM
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Thanks alot bud
Old Aug 31, 2003 | 07:51 AM
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thanks alot I will try it out and see if works how do I get the tables to help me get the a/f ratio?
Old Aug 31, 2003 | 11:08 AM
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From: so close I can taste it...
Originally posted by Fbody1
thanks alot I will try it out and see if works how do I get the tables to help me get the a/f ratio?
Which tables? The tables that affect wot a/f ratio?
Old Aug 31, 2003 | 12:22 PM
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on the maf tables in TC there are 4 tables. are they all the same because its such a big table and its just broke down, or does one tables do one thing and another do something else, because they are just labled 1 2 3 4. so like to correct for a ported MAF what would you do to the tables and would you do it to all them.
Old Aug 31, 2003 | 12:41 PM
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From: so close I can taste it...
Originally posted by 97Z-M6
on the maf tables in TC there are 4 tables. are they all the same because its such a big table and its just broke down, or does one tables do one thing and another do something else, because they are just labled 1 2 3 4. so like to correct for a ported MAF what would you do to the tables and would you do it to all them.
There are 4 tables so that you aren't looking at 1 huge table. All are different, just broken apart from the full table.
To correct for the ported maf you are supposed to multiply the full table by a certain percentage. I don't know what it is, maybe 20%, because I'd rather not deal with a ported maf.
Old Aug 31, 2003 | 07:20 PM
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was talking about how to find the a/f ratio@wot , thanks
Old Aug 31, 2003 | 07:26 PM
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From: so close I can taste it...
Not sure what you're asking, but the % change air/fuel ratio tables is where your wot fueling comes from. That what you're asking?
Or are you asking how they work in conjunction with any other tables in order to arrive at a desired injector pulsewidth?
Old Sep 1, 2003 | 09:20 AM
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From: fl,jax
yea that too,
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