Siamesed Runner TPI Questions...

[Dave Zug]

This thread over here too?

Its not for everyone... but it is possible to extend the range of the TPI
more to popular liking...

Think of how the siamesed runners shift the curve. Now say "what if" the
runners were siamesed all the way down?  more shift. Now... hmmm.. what if
the siamesing was extended all the way INTO the base?  no need for large
runners or a ported upper intake now... cause you're drawing from 2 runers
simultaneously!  reversion is a concers, especially with #5 stealing fuel
from #7 in the cycle of things but cam overlap management can help here.

Here is Mike's URL with dynos of some different TPI intakes.. including the
siamesed-base.
http://www.eecis.udel.edu/~davis/z28/winter01/dyno/

again.. not for everyone... just another idea for the mix.. complete with
dyno data.

Oh.. the siamesed-base dyno will be re-done soon. A problem was found with
the motor setup and is now repaired.. the dyno comparisons illustrate the
mod well enough (a zero dollar mod I might note) .. but the next set should
show more of an appropriate comparison. stay tuned! ;-)

-Dave Z

89 Iroc - '730 - 383 large tube MAP TPI, ZZ3 cam ,dry NOS 50 shot.
12.79 @106 / 12.08 @ 112.   www.delanet.com/~tgp
92 25th annev convertible  305 / T56.  268 mph in a perfect vacuum.
----- Original Message -----
From: Bruce <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, May 29, 2001 5:15 PM
Subject: Re: Siamesed Runner TPI Questions...


>
>
> > Researching EFI updates for 71 Vette with 406/400. 218 @ .050 110 LSA
flat
> hyd
> > cam with TFS Twisted Wedge heads and headers etc, currently a
well-dialed
> Q-Jet
> > and Performer dual-plane (hood clearence). Power peak is at 5200 rpm and
> the
> > torque peak is about 4000 rpm.
> > So, since TPI stuff is cheap I was wondering how siamesed runners would
> effect
> > the power curve?
>
> Just the oem stuff.
>
> > A stock or big tube TPI (with big manifold base) will kill power over
4500
> rpm
> > with a 406ci, but I'd think that the siamesed runners would behave more
> like
> > the shorter runners of the Lingenfelter/Accel Super Ram as they're
> partially
> > open etc. What do Ya'll think?
>
> Still no plenum volume.
> If you happy with what you have how about, a TBI?.
> Maybe a  Weiand 7527, or 7546 manifold, then up grade one of them to TPI
if
> you want to progress further.
>
> > Would a Big Manifold Base/TB Siamesed Runner TPI set-up be able to
support
> a
> > 406ci through 5600 rpm?
>
> Would be a real push to even try
> Bruce
> > TIA...
> > Doug
>
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