What all can affect timing?

[DamnYankee]

But shouldn't the PCM learn the amount of air coming in?

[txarkitekt]

<div class='quotetop'>QUOTE(DamnYankee &#064; Apr 27 2007, 01&#58;48 PM) [snapback]91601[/snapback]</div>

But shouldn&#39;t the PCM learn the amount of air coming in?
[/b]

Well, I am not as smart as Red or anything, but isn&#39;t the PCM only able to handle up to certain parameters? I know what you are saying, but it takes a few days for it to learn that stuff. Did Allen do your current tune with the homemade ram air?

And what I can&#39;t figure out is why you can&#39;t advance the timing curve thru the HPT when it starts taking in air--like when it drops to 19....

[RedHeartbeat]

Once you start pressuring the intake you need a 2bar MAP sensor to calibrate just as if you had a turbo on the truck. Maybe?

[DamnYankee]

I&#39;m too tired to put any effort into not looking stupid, so - I don&#39;t know what a 2 bar MAP sensor is.

Maybe I&#39;ll pull the ram air crap completely off on my way home from work and see if that helps...?

[txarkitekt]

<div class='quotetop'>QUOTE(DamnYankee &#064; Apr 27 2007, 01&#58;53 PM) [snapback]91604[/snapback]</div>

I&#39;m too tired to put any effort into not looking stupid, so - I don&#39;t know what a 2 bar MAP sensor is.

Maybe I&#39;ll pull the ram air crap completely off on my way home from work and see if that helps...?
[/b]

I don&#39;t know if I&#39;d take it all off, just block it off or take it out of the bottom of the box and rest it inside the engine bay.... From what it looks like, a disconnect would be easy to do to see if that is what is causing the problem...IMO, I think it is the culprit.

[DamnYankee]

Virgil, whattaya think? You bringing your laptop tonight?

<div class='quotetop'>QUOTE(txarkitekt &#064; Apr 27 2007, 01&#58;53 PM) [snapback]91603[/snapback]</div>

Well, I am not as smart as Red or anything, but isn&#39;t the PCM only able to handle up to certain parameters? I know what you are saying, but it takes a few days for it to learn that stuff. Did Allen do your current tune with the homemade ram air?

And what I can&#39;t figure out is why you can&#39;t advance the timing curve thru the HPT when it starts taking in air--like when it drops to 19....
[/b]

Allen hasn&#39;t tuned it live with the ram air, no.

[txarkitekt]

<div class='quotetop'>QUOTE(DamnYankee &#064; Apr 27 2007, 02&#58;00 PM) [snapback]91607[/snapback]</div>

Allen hasn&#39;t tuned it live with the ram air, no.
[/b]

Hmmmmmmmm.....

[RedHeartbeat]

Just cover the bumper air inlets with duct tape and see what happens. If it does the same thing it&#39;s either the PCM or something else entirely.

[DamnYankee]

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Apr 27 2007, 02&#58;04 PM) [snapback]91608[/snapback]</div>

Just cover the bumper air inlets with duct tape and see what happens. If it does the same thing it&#39;s either the PCM or something else entirely.
[/b]

then it won&#39;t get any air - that&#39;s my only source at the moment

[txarkitekt]

<div class='quotetop'>QUOTE(DamnYankee &#064; Apr 27 2007, 02&#58;15 PM) [snapback]91614[/snapback]</div>

then it won&#39;t get any air - that&#39;s my only source at the moment
[/b]

Oh. Now that I think about it, can you un-duct tape the port to the fender so it pulls it from there--like back to stock?