Results 1 to 5 of 5

Thread: Confused about MAF air flow----need help

  1. #1
    Advanced Tuner coachcrow56's Avatar
    Join Date
    Dec 2004
    Location
    Longview, Texas
    Posts
    305

    Confused about MAF air flow----need help

    Air flow confuses me, (might be my cancer treatment) so could someone set me straight.

    I have a 2000 GTP that at 6000 rpm shows a MAF flow of 57.84 lb/min at 10644 Hz. I am pretty sure I am not maxed out.

    I have a Northstar TB and the MAF that comes with it, and as best I can remember I just tuned it with my stock MAF table, which reads a max of 11500 Hz and 4063 lb/h.

    I got ZZP to upload the LQ4 MAF table to my tune, and it reads a max of 11500 Hz and 3114 lb/h. I have not written this file to my car, or modified (tuned) it.

    How can I tell if these tables are the same? In the bottom right corner of the Editor both files (mine and the ZZP file) show 0 to 4063 lb/h.

    Sorry for the confusion on my part, but I think chemo has affected my thought processes. LOL!
    2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors

  2. #2
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    The difference in the lb/hr is the relationship between airflow and fuel. Looks like they removed approximately 23% fuel, up top anyway.

    That table is literally how much fuel to deliver at a specific hz.
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  3. #3
    Advanced Tuner coachcrow56's Avatar
    Join Date
    Dec 2004
    Location
    Longview, Texas
    Posts
    305
    So if the lb/hr is less at 11,500 Hz in the table that ZZP sent me, then it is leaner, right? I am assuming that you can take a stock MAF table and tune it, and it will flow the same as an LQ4 table? Please correct me if I am wrong.
    2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors

  4. #4
    Senior Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Slidell, La.
    Posts
    1,015
    Maf is defined by the sensor itself, and the tube size, shape, and how close it is to bends. You "tune" the maf curve to accommodate these changes

    so yes, if the same cell commands a lower fuel flow, then yes it will be leaner. There are way more things going on here than just its an lq4 sensor so an lq4 table will work
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    20yr Master Tech.
    Advanced Level Specialist
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  5. #5
    Advanced Tuner coachcrow56's Avatar
    Join Date
    Dec 2004
    Location
    Longview, Texas
    Posts
    305
    My current tune is pretty good, I think. I have no KR with a 2.8 pulley, but like everyone, I look for more power. Should I add the LQ4 MAF to my tune,and tune it, or just keep what I have? I am attaching a scan and my tune. Please feel free to comment on my tune.
    Attached Files Attached Files
    2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors