165 MAF Computer

[romans, mark]

"How do you tell a race shop that's built a bazillion race engines that this
last one with
all the whizziest parts isn't flowing air ??"

When you measure it with a properly operating MAF what argument is there?

Mark

----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 30, 2001 9:55 AM
Subject: Re: 165 MAF Computer


> >>If your maf is reading properly and you are only reading 175 grams/sec
> then
> your system just isn't flowing much air.<<
>
> That's exactly what I tried to tell them, too !! That's the point at which
> the S10 just
> quits pulling...it'll gain a higher MAF value, but never pulls hard past
> 4500 RPM.
> They've built rigs with exactly the same bottom end with carburation and
> have never
> run into these problems...the cam in use now is a 110 lobe centre, 258/264
> and
> .480 and .487 exh. From the dyno software I use, this thing should have
> gained around
> 50 HP above 5K--instead it lost about 50 HP. Worst thing was I recommended
> this
> cam above the stock camshaft--since we didn't want to get into a lopey
idle.
> How do you tell a race shop that's built a bazillion race engines that
this
> last one with
> all the whizziest parts isn't flowing air ??
>
> Lyndon.
>
>
>
> ----- Original Message -----
> From: romans, mark <romans at starstream.net>
> To: <gmecm at diy-efi.org>
> Sent: Friday, June 29, 2001 9:52 PM
> Subject: Re: 165 MAF Computer
>
>
> > I've done a few hundred chips, mostly for my car and a few friends
> > cars.  All of these cars have modified maf sensors.  At minimum the
> > screens are removed, at most the heat sinks too.
> > The ecm software is limited to 255 grams/sec.  The maf sensor will
> > flow more air than that, but the software can't read it.
> > My stock 87 vet would read up to 208 grams/sec, it ran 14.2 at 101 best.
> > I now have a 355 with Superram, Hot LT4 cam, TPIS headers, ported heads
> > and I max out the maf at about 4700 rpms.  Above that, since the maf is
no
> > longer reading air flow the system becomes alpha n.
> > When a larger or more air flow system is used the maf pegs out earlier.
> > If your maf is reading properly and you are only reading 175 grams/sec
> then
> > your system just isn't flowing much air.
> >
> > My car makes a bit over 300 rwhp, my best now is a severely traction
> limited
> > 13.4 @ 107.7 mph.
> >
> > I don't know where the 175 grams/sec came from, but I can guarantee it's
> > horse
> > pucky!
> >
> > Mark
> >
> > ----- Original Message -----
> > From: "NickG" <nikog at mediaone.net>
> > To: <gmecm at diy-efi.org>
> > Cc: <nwester at eidnet.org>
> > Sent: Friday, June 29, 2001 8:14 PM
> > Subject: Re: 165 MAF Computer
> >
> >
> > > I've helped a friend reprogram his '87 Vette with a built up 406. His
> > stock
> > > ported MAF maxes out at 255g/s at around 4000rpm (as reported in
> Diacom).
> > > The only thing I can think of that might make a difference is that
he's
> > got
> > > the GM replacement ECM for the '165 (don't remember the number
off-hand)
> > and
> > > running ARAP code as a base.
> > >
> > > Nick
> > >
> > > > Hey guys...I'd like to know something, as I just withstood a
> > > > tongue lashing that kinda makes sense--yet I've heard otherwise
> > > > here.
> > > >
> > > > 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
?
> > > >
> > > > I've had a go-round with a customer for the past 6 months, we've
tried
> > to
> > > > get his rig up to snuff through the past 20 mailed out chips. Low
> speed
> > > > driveability is excellent--but his 1/4 mile sucks.
> > > > For the parts this S10 TPI thing has in it, it should just fly. I'd
> have
> > > to
> > > > say at this
> > > > point--forget the '165 if you're trying to make power, and put in a
> > '730.
> > > >
> > > > Lyndon.
> > >
> > >
> >
>
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