Re: MAF BLM based tuning

["Bruce Plecan" <nacelp@bright.net>]

> Bruce,
>     That's what I thought about the MAF.  That it has a maximum amount of
> air it can measure and is physically limited.  But, below you stated "The
> MAF doesn't stop the engine from making any HP at a specific gm/sec, just
> your out of calibration when that happens, ie no more timing corrections
or
> fuel corrections can be made.  Given the right combo, you can get 500 HP
out
> of one, but that probably er could just as easily be 550" - Grumpy.  I've
> pretty much resolved the fact that I am going to have to convert to a '730
> MAP but the statement you made above gave me a second thought.  Could you
> fairly accurately rely on the 02 sensor and TPS (even if they are
> predetermined values) to give sensor feedback when the MAF is maxed?  Just
> curious.

The gm O2 sensor is a switching type devise, no more no less, tuning to get
a specific voltage is dumb.  Once the tune is optimized for you setup it can
**be**  **kinda**, guage for being **kinda** close.  If you read thru the
archives there are several postings about where guys have compared WB O2
reading to the gm oem type and the AFR are no where near reliable, no where.
Ya ya, there are some guys spittin numbers that so and so works ya for there
car maybe.
So only the mis / uninformed rely on the O2 as a true indicator of mixture.

A WB O2 and TPS are claimed to work by the Felpro guys.
But that gets way off topic
Grumpy
>
> Jim Brady
> '87 Monte SS 383 TPI 6 speed
>
> >
> > >     With that being the case why would I want to trash the MAF in
favor
> of
> > > MAP for my future forced induction application?
> >
> > ????
> > As I said you run out of calibration.   Exagerated, it's like trying to
> run
> > a 6K rpm with the timing set at initial advance.  You can do it but but
> > it'll be real hard to make the HP.
> >
> >  I know that upgrading from
> > > a '870 to a '165 would increase my serial data rate but what would I
> gain
> > > from a '730?
> >
> > Going 730 means going MAP. and the 749 and 730s are the only 2 bar
> > application redialy available ecms for a v-8.
> >
> >   Couldn't the MAF data be recalibrated with a prom to measure
> > > greater airflow than it was intended to measure stock?
> >
> > Not, by any mere mortals.
> >
> >  I'm hoping for
> > > 500-550hp and would like use the MAF computer in the short term.
> >
> > Best of luck, might read the archives, and form your own opinion, based
on
> > more opinions then just mine
> > Grumpy
> >
> > >
> > > Jim Brady
> > > '87 Monte SS 383 TPI 6 speed
> > >
> > > >
> > > > Er, hmm,
> > > > and where is it said that that maf is a 255er?.
> > > > The GN is, a 255er.
> > > > The MAF doesn't stop the engine from making any HP at a specific
> gm/sec,
> > > > just your out of calibration when that happens, ie no more timing
> > > > corrections or fuel corrections can be made.  Given the right combo,
> you
> > > can
> > > > get 500 HP out of one, but that probably er could just as easily be
> 550.
> > > > Grumpy
> > > >
> > > >
> > > > > The MAF just barely touches 231 as the automatic shifts, so NO its
> not
> > > > > maxxed.  Now the LV8 rides at 255 except for a brief drop off just
> > > before
> > > > > the shifts, in a WOT run.  All the talk about maxing out the MAF
and
> > my
> > > > > stroker motor ain't there yet, but the E.T. numbers show it's
> pushing
> > > 350
> > > > > HP.  If what is really meant is that the LV8 will max out, well I
> can
> > > see
> > > > > that.
> > > > >
> > > <snip
> > > > > > Dave,
> > > > > >     Are you outflowing the MAF yet?  How are you modifying your
> > > > ECM/PROM?
> > > > > > Do you think knocking you initial timing back could help your
> > > knocking?
> > > > > I'm
> > > > > > running 87 octane w/9.3:1 compression (aluminum heads) with no
> > knocks
> > > so
> > > > > > far.  What mods(if any more) do you have planned for the future?
> > > > > >
> > > > > > Jim Brady
> > > > > > '87 Monte SS 383 TPI 6 speed
> > > > >
>
>
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