165 MAF Computer

[Programmer]

I recommended the XR258H cam--not the
CS808. Figured I'd better make that clear.

----- Original Message -----
From: Programmer <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 30, 2001 1:17 PM
Subject: Re: 165 MAF Computer


> Perf Trends software extrapolated numbers were:
>
> Peak TQ 4250 RPM 303 ft/lbs
> Peak HP 5250 RPM 269 HP (CS808 SpeedPro Cam)
>
> Peak TQ 4500 RPM 312 ft/lbs
> Peak HP 5750 RPM 313 HP (XR258H-10 Comp Cam)
>
> The basic power curve followed the CS808 almost spot for spot all the way
> through
> the TQ and HP curve till it got past 4500. That was the only change--and
an
> equal power fall off...anyways--it's all my fault. Like I said, I'd have
> loved to
> have this rig here...
>
> Lyndon.
>
> ----- Original Message -----
> From: Bruce <nacelp at bright.net>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, June 30, 2001 12:53 PM
> Subject: Re: 165 MAF Computer
>
>
> >
> > If you want a glass smooth idle and performance then you're going to
need
> > NOX, or Supercharging.
> > Looking at that cam, I can't see where you expect to make any serious
HP.
> >
> > You might be having so much reversion that the MAF is just all confused
> > about what's going on.   You may have such a weird combo., that it just
> > won't breath thru a throttle body as opposed to a 4 barrel.
> >
> > I'd check things really close, leak down, compression, and then cam
> timing,
> > and have another cam standing by for reassembly <g>..
> > Bruce
> >
> >
> >
> >
> > From: "Programmer" <nwester at eidnet.org>
> > 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.
> >
> >
>
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