165 MAF Computer

[Programmer]

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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