Siamesed Runner TPI Questions...

[Eric Exton]

I have been researching this and as far as I can tell from looking at dyno
charts, the curves look the same but the peaks are shifted up a couple
hundred rpm. So, I would think you would still be gasping for air by 5000
rpm.

-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
Of Doug Dayson
Sent: Tuesday, May 29, 2001 9:46 AM
To: gmecm at diy-efi.org
Subject: Siamesed Runner TPI Questions...




Hi All...

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?

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?

Would a Big Manifold Base/TB Siamesed Runner TPI set-up be able to support a
406ci through 5600 rpm?

TIA...

Doug

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