165 MAF Computer

[Programmer]

>>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.
> >
> >
>
> --------------------------------------------------------------------------
> --
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo at lists.diy-efi.org
> >
> >
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org