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Re: MAF BLM based tuning



Bruce,
    Yeah, looks like I am going to have to bite the bullet and start my
preliminary planning for the installation of a '730.  Which factory EPROM
would be a good starting point?  How would I go about recalibrating a new
one?

Jim Brady
'87 Monte SS 383 TPI 6 speed

>
> Bruce ,
>     With that being the case why would I want to trash the MAF in favor of
> MAP for my future forced induction application?
>
> For ease of execution and resolution of calibration, yes.
> You *might* get by using a late 3.5 MAF, but it would be alot of work.
> MAFs, Hate Oil, so it would have to be upstream of the S/C. I haven't seen
> any hacs for the new stuff floating around, so it would mean adapting the
> MAF.  No ones tried just resetting the maf frequency numbers in a 165 and
> tried that, so that is one possible answer, but:
>
> Or just runs Johns 2bar 730 patched code, run a vacuum line to the MAP,
and
> be done with it.  AND there is that full time baro option.
>
> Plan B sure sounds easier to me.
> Grumpy
>
>
>
>
>  I know that upgrading from a '870 to a '165 would increase my serial data
> rate but what would I
> gain from a '730?
>
> Drive ablity, tuning is easier..i found droped me over .5 sec in ¼
compared
> to stock maf
>
> Couldn't the MAF data be recalibrated with a prom to measure greater
airflow
> than it was intended to measure stock?
>
> Then you loose resolution and hencedriveablity
>
> I'm hoping for 500-550hp and would like use the MAF computer in the short
> term.
>
> Been through all this when I was a newbie too.....the 730 seems to
> be a newer ecm.. got more tables and options to play with, like lean
cruise
> mode, better tcc control(not that it matters to you)
> Easy to patch stuff from other 730 apps, close relative to 749.. I
> think, so is possible to controll boost,ect ect..
> Trust me.. much easier to tune....better throttle response, and mpg
> in town and in hills... higway was same as 165.,
>
> > 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
> > >
> > > <Snip>
>
>
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