165 MAF computer

[Shannen Durphey]

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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