RE: programmable engine management

["Neal Tovsen" <sixteen.volt@verizon.net>]

So it **only** runs off of the throttle position? I'm not an EFI expert, but
that doesn't sound much different than a carburator!

How does it know if it is running rich or lean? How does it accomodate
altitude, temp, or humidity changes? Only through the O2 sensor? That's
*after* the combustion. Shouldn't it be able to predict and adapt the fuel
settings, rather than wait for an 02 sensor reading?

Neal

> -----Original Message-----
> From: owner-scirocco-l@scirocco.org
> [mailto:owner-scirocco-l@scirocco.org]On Behalf Of Lauri Pettai
> Sent: Sunday, September 16, 2001 2:03 PM
> To: Neal Tovsen; Scott F. Williams; Cheapass Ron; Scirocco-L
> Subject: Re: programmable engine management
>
>
> > > > So where does the airflow meter
> > > > go????   Where am I stupid here?  What is my wrong assumption???
> > >
> > > Yo, Cheapass! Your amusing incorrect assumption is that the
> state of the
> > > fuel injection art is still stuck in an eighties timewarp! :^) We
> > > don't need
> > > no steenking airflow meters anymore! Consider that the load on the
> engine
> > > must be measured somehow. There are two ways of doing this: either
> measure
> > > the amount of the air flowing in (our scenario), or measure
> the manifold
> > > pressure plus other related functions.
> >
> > I don't think Ron's stuck in the 80's, though he /is/ an old chap! I was
> > wondering the same thing too. And I'm not looking for a floating
> mechanical
> > plate, either!
> >
> > I think we were both just wondering if there was a place to
> mount a MAP or
> > MAF sensor. On any car I've known, the MAP or MAF is mounted to
> the intake
> > before the individual cylinder runners split, but on a separate
> TB system,
> > there is no such place. I suppose it could be only mounted on
> one TB with
> > calculations to account for four cylinders, but at a glance, it doesn't
> even
> > look like there's room for any such sensor below the air horns.
> Where does
> > it go?
>
> Hmm... Scott is probably stuck in nineties. :) We do not even need a MAP
> sensor
> for TB conversion. The engine load is only measured by TB sensor.
> TB sensor
> is
> usually used for acceleration enrichment, but when doing a TB
> conversion it
> has
> to be used for both. As you said that there's no place to connect a MAP
> sensor
> and even if you run a separate vacuum wire from each runner then you get a
> MAP
> pressure that is so jumpy that you can't map nothing with it so TB sensing
> is the
> only way to do it right. At least my system is set up like that and it
> works.
>
> Lauri!
> '84 2.0 16v Scirocco GTX Kamei X1 Bodykit (VIN025736)
> http://www.eabc.edu.ee/~laurts/scirocco
> I finally added something new to my site!
>
>
>
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