Seen this yet?

[fahrvegnugen at cox.net (David Utley)]

> 
> From: "Dan Bubb" <jdbubb@ix.netcom.com>
> Date: 2004/07/14 Wed PM 05:37:52 EDT
> To: <fahrvegnugen@cox.net>, 
> 	<scirocco-l@scirocco.org>
> Subject: Re: Seen this yet?
> 
> Fueling is determined by a load vs. RPM matrix.
> Load can be determined by a MAF (mass airflow meter), TPS (throttle position sensor) or MAP
> (manifold absolute pressure).
> Megasquirt generally uses a MAP sensor for load.
> So, at each of the 64 matrix locations in the standard 8 x 8 matrix you would enter an engine VE
> (volumetric efficiency) and that number would correspond to an injector open time. You can put in
> any value you want, good or bad.
> The AFR table lets you put in a target AFR for each of the 64 positions. The Megasquirt will then
> try to correct the VE value to obtain the AFR that you want irrespective of the correctness of the
> VE entry.
> If your VE entries are very close to actual requirement then the auto correction to the desired AFR
> will be minimal and the power/economy benefits will be minimal. If the VE entries are way off the
> unit will correct and you should see a benefit. I'm sure there is also a way to see what the
> corrections are and write them back to the VE table.
> HTH.
> Dan

Interesting.  SO, in short, it makes it easier to tune.  And now that you can use a wide band 02, you are assured all the power that you can get, right?

David

 
> ----- Original Message -----
> From: "David Utley" <fahrvegnugen@cox.net>
> To: "Dan Bubb" <jdbubb@ix.netcom.com>; <scirocco-l@scirocco.org>
> Sent: Wednesday, July 14, 2004 5:06 PM
> Subject: Re: Seen this yet?
> 
> 
> >
> > >
> > > From: "Dan Bubb" <jdbubb@ix.netcom.com>
> > > Date: 2004/07/14 Wed PM 01:12:37 EDT
> > > To: <scirocco-l@scirocco.org>
> > > Subject: Seen this yet?
> > >
> > >
> > > Not exactly new news, but this stuff justs keeps getting better.  12x12 table, ignition
> included,
> > > target AFR,
> > >
> > >
> > > http://www.megasquirt.info/ms2/
> > >
> > >
> > > Target AFR! Not too many aftermarket management systems have that!
> > > My 16V is crying out to me!
> > >
> > > Dan
> >
> > Target AFR, so you can target an air fuel ratio, and MS will go to that, regardless of any other
> input?  I am a little confused.  IF I am on the right track, can you adjust what AFR you want for a
> given RPM, and perhaps load (although I am sketchy on how it would discover the load)?
> >
> > I am interested, just fairly computer illiterate, esp. with MAF-type EFI...
> >
> > Cheers,
> >  David
> >
> >
> > ---Chrome don't get you home.---
> >
> 
> 
> 


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