Siamesed Runner TPI Questions...

[David & Cheryl Haggard]

   Just my opinion, but I wouldn't put TPI on a 400. In my opinion, even
siamesed TPI runners on a hi-flo base won't feed enough air to a 400 to make
serious power. But then, I haven't tried it, nor do I know anybody who has.
But TPI is generally a 305 system, and wheezy when bolted on a 350. I
wouldn't use it on a 400.

Dave Haggard


> -----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 11:46 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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