165 MAF computer

[Programmer]

It'd be good to find the quirk. Customer's swapover from an '89 Camaro.
I'm using the 'vette binary ABTZ. They've tried the MAF thing, etc...it's
been
a yearlong battle that I got involved with about 6 months ago.

Lyndon.
----- Original Message -----
From: Shannen Durphey <shannen at grolen.com>
To: <gmecm at diy-efi.org>
Sent: Friday, June 29, 2001 4:23 PM
Subject: Re: 165 MAF computer


> How old is the 165? Early version, or later one?  What's the memcal/code
based
> on?  Y or F car?  Anybody ever test the MAF? (No, don't throw a new one
on,
> measure voltage!)  How about simulating a MAF signal for the ecm?
>
> The limit for the GPS is due to the gps value being stored as an 8 bit
number,
> which can be a maximum value of FF hex, which is generally equivalent to
255.
> It's not a number to be found in the code, it's in the method.
>
> Shannen
>
>
>
> Programmer wrote:
> >
> > S10 has been to 6K-- never made more than 180 grams per sec--thats
> > what the guys at Harrison Performance Engineering said...torque falls
> > after 4500 RPM.
> > He gets great fuel economy, though <g>... says it's actually kinda
scary.
> > >From the list of parts of what I remember:
> >
> > 305 TPI with 22 lb injectors
> > CS808 SpeedPro Cam (one notch above stock)
> > Full length mandrel bent headers
> > Dart 2 heads (ported and flowed).
> > Accel SuperRam induction
> > 9.3 CR and 1.6 ratio roller rockers.
> > My programming...
> >
> > Best ET has been 89 MPH at sealevel in the quarter.
> > Sorry--don't have the actual time on that one.
> >
> > Lyndon.
> > ----- Original Message -----
> > From: Gabe <gellett at earthlink.net>
> > To: <gmecm at diy-efi.org>
> > Sent: Friday, June 29, 2001 2:48 PM
> > Subject: Re: 165 MAF computer
> >
> > > After going over some of my data logging, the highest readings I've
see
> > out of
> > > my setup are 179gm/s @ 4550 RPM....
> > >
> > > I just figgered it was cause my little old stock 305 couldn't breathe
more
> > > deeply than that...
> > >
> > > Gabe
> > >
> > > Programmer wrote:
> > >
> > > > AHA !!!!!! I'm kinda thinking we're the only two that have been
> > > > there, now...and you know what ? It won't matter how you tune
> > > > it--the MAF is somehow software/hardware limited to 175 grams
> > > > per sec.
> > > >
> > > > Lyndon.
> > > > ----- Original Message -----
> > > > From: Marteney, Steven J. <smarteney at xlvision.com>
> > > > To: <gmecm at diy-efi.org>
> > > > Sent: Friday, June 29, 2001 2:20 PM
> > > > Subject: RE: 165 MAF computer
> > > >
> > > > > I'd like to believe horsepucky too but here's what recently
happened
> > to
> > > > me.
> > > > > I did a full-throttle run, no track just empty run, and a bud
watched
> > > > > Diacom.  The reading never went above 175gps.  I'm in the same
boat
> > this
> > > > S10
> > > > > guy is in.  Lots of mods "the thing should just fly" but my
> > performance
> > > > > sucks.  Granted I also suck at tuning which is slowly being
corrected.
> > > > I've
> > > > > used the HomeDyno/StreetDyno programs and it says I'm making
266lb-ft
> > of
> > > > > torque peak.  I then ran those curves into a drag simulator (that
I'm
> > > > > writing myself) and it predicted mid-15 second times.  I work at
place
> > on
> > > > a
> > > > > back-road that just happens to have two stripes 1/4 mile apart.
Had a
> > > > > friend time me with a stopwatch (in the car and he weighs 300+lbs)
and
> > the
> > > > > car did 16.2 at about 85+ on the speedo.  Pretty crappy for an 89
TPI
> > > > > Formula ZZ3 cam, SLP 1 3/4" headers, RandomTech cat, fully
balanced,
> > > > > flat-top pistons, flowmatched injectors, K&N filter.  Never seeing
the
> > MAF
> > > > > reading go above 175gps makes me suspicious.
> > > > >
> > > > > Steve
> > > > >
> > > > > -----Original Message-----
> > > > > From: Scot Sealander [mailto:Sealand at clarityconnect.com]
> > > > > Sent: Friday, June 29, 2001 3:43 PM
> > > > > To: gmecm at diy-efi.org
> > > > > Subject: Re: 165 MAF computer
> > > > >
> > > > >
> > > > > Programmer wrote:
> > > > >
> > > > > > The '165 MAF only computer is limited to sensing 175 grams per
> > second,
> > > > > > maximum power is around 200 HP and that's it. This is the word
from
> > one
> > > > > > of the original guys that made ACCEL's DFI system.True or
horsepucky
> > ?
> > > > >
> > > > > Horsepucky.  The MAF code dies at 255 gps, or about 325 HP.  The
MAF
> > is
> > > > > about the same.  The TPI's maxed at about 245 HP from GM as I
recall.
> > > > >
> > > > > Scot Sealander
> > > >
> >
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> > > >
> > >
> >
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