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Thread: how much max, NA, WOT air flow (g/s) does your log show?

  1. #1
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    Default how much max, NA, WOT air flow (g/s) does your log show?

    How much logged airflow @ WOT do you see? What intake, TB, valve lift, overlap, RPM, MAP? I'm getting 298 g/s & would like to know if this is about right? Thanks. Here's a log for reference.

    The (spark) knock retard has been changed.
    Attached Files Attached Files

  2. #2
    Joe (Moderator) joecar's Avatar
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    What year/model car and what engine size/mods do you have...?

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    5.7L LS6 block, AFR 205 heads, Weiand intake, 85mm TB, .552/.556 valve lift, that log was to 6,000 RPM; can go to 6400. Although, air flow begins to drop @ 6K. 99 LS6 powered Miata.

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    Joe (Moderator) joecar's Avatar
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    300 g/s sounds about right, maybe on the low side of ok... what altitude are you at...?

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    950ft above sea level. Just a note: W/ gaskets & head clean up SCR is 10.76:1, DCR is 8.4:1 if I remember correctly. If the g/s is a bit low, then it may be the 1.8 roller rockers that were installed over the Winter. BTW, the valve lift is .556"/.563"; went the wrong way in the earlier reply (.309"/.313" cam 1.8 rockers). My set up has no reference for the stock 1.7's, as I didn't have tuning software to check air flow then. Heads/ block have only about 3-4K since heads were reconditioned & assembled bock was new.

    Would exhaust scavaging reduce the measured MAF airflow readings? Am thinking that maybe exhaust scavaging is providing some of the air volume. There isn't much, but, perhaps that is the difference?

    Thanks for your comments & I look forward to your further thoughts.

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    my g/s hits 310 and i am 6000ft above sealevel

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    Quote Originally Posted by ls698ta View Post
    my g/s hits 310 and i am 6000ft above sealevel


    Thanks for the reply. We had determind that the car could not properly vent through the PCV valve & my MAF calibration was off a bit. Haven't gone WOT since correcting these issues. Will be well over 300 g/s once it's tested. Are your MAF settings stock or have they been adjusted according to MAF, air box,....etc., mods.? What are your engine spec's./mods.?

    Am currently learning more about tuning & correcting the areas related to short term & long term fueling. Once that's done, will check WOT airflow again.

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