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speed density tuning

This is a discussion on speed density tuning within the Computer & Tuning forums, part of the LSx Technical Help Section category; anyone going MAF-less? i think i saw sarge say he is. since i have relatively no idea what the overall ...

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    no more 4th gen secondgearscratch's Avatar
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    speed density tuning

    anyone going MAF-less? i think i saw sarge say he is.

    since i have relatively no idea what the overall benefits of this are, i was hoping some one could fill me in. i read alittle article in gmhtp about a t/a that had efi live and a speed density tune but it sort of flew over my head.

    anybody???

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    Junior Member JunkyardTurbos's Avatar
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    I'd keep the MAF unless you are maxing it out (boosted). The MAF helps in transitional states while in closed-loop. Of course, there is much debate about his topic and I'm sure that future posts in this thread will prove that.

    A MAF tune also acts as a failsafe, directing timing to the low-octane table in the event of a problem.

    If you dial in your VE and MAF tables while keeping the flow within the MAF's 512g/sec. range, I don't see a reason to go to a speed density tune.

    Speed density tunes will vary performance depending on weather. A barometric pressure change will throw your tune off because the tables are referenced given input from sensors such as MAP, RPM and IAT, rather than having input from a meter that reads actual flow.

    On the flip-side, boosted applications that exceed the MAF's limitations should move to a 2 or 3 bar speed density tune.

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by JunkyardTurbos View Post
    I'd keep the MAF unless you are maxing it out (boosted). The MAF helps in transitional states while in closed-loop. Of course, there is much debate about his topic and I'm sure that future posts in this thread will prove that.

    A MAF tune also acts as a failsafe, directing timing to the low-octane table in the event of a problem.

    If you dial in your VE and MAF tables while keeping the flow within the MAF's 512g/sec. range, I don't see a reason to go to a speed density tune.

    Speed density tunes will vary performance depending on weather. A barometric pressure change will throw your tune off because the tables are referenced given input from sensors such as MAP, RPM and IAT, rather than having input from a meter that reads actual flow.

    On the flip-side, boosted applications that exceed the MAF's limitations should move to a 2 or 3 bar speed density tune.
    thanks alot man. good info!

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