Fw: [Gmecm] Fw: TPI on a 412sbc

[Rick McLeod]

Actually, 3 different states of build, one factory stock al head in 'vette, one iron headed built out w/ cam, headers, jectors, and other various goodies & aggressively tuned cal in an IROC, and a third iron headed basically stock except high-flow header/exhaust and minor tune lumped into a Jag.
Of the 3, the stock box seems to rev the best, the stocker iron 2nd best, and the major modified rev's the poorest. Am I dissapointed in the highly modified? just a little, but the low end torque is phenominal, it more than makes up for the reduced virtual redline, and since it's a driver, stoplight to stoplight performance is exceptional, seat of the pants experience is ........... well, scary to the uninitiated. It matches what I built the engine to do, but if I'd have wanted a 6k engine, I'd definately have chosen a different intake, something like a ramjet with much shorter runners with larger flows at higher rpm. I've seen many attempts to modify VE and it simply doesn't produce, yes it improves it some (and the IROC is modified). Even Lingenfelter admits (he's (was) one of the most experineced and authoratative at squeezing SBC's to the limit) that the TPI in stock form dies at RPM, siameesed runners helps when adapted to ported plenums and intakes, beyond that he
 designed a modified plenum/runner/intake to replace the TPI that rocks! I simply can't justify the $$$ for it when I got what I want w/ the torque mongrel I built.

----- Original Message ----
From: Programmer <lwester at lincsat.com>
To: Rick McLeod <dunvegan at sbcglobal.net>; gmecm at diy-efi.org
Sent: Wednesday, May 31, 2006 4:06:45 PM
Subject: Re: [Gmecm] Fw: TPI on a 412sbc


Running 3 of 'em in different states ? Is that US states or different states 
of repair ?

Look carefully at the VE tables on those...that reveals a lot of what goes 
on at higher RPM.

Lyndon.

----- Original Message ----- 
From: "Rick McLeod" <dunvegan at sbcglobal.net>
To: <gmecm at diy-efi.org>
Sent: Wednesday, May 31, 2006 12:29 PM
Subject: Re: [Gmecm] Fw: TPI on a 412sbc


> In my opinion, you're going to be very dissapointed unless u use an 
> aftermarket TPI intake/plenum/runners, as the factory becomes very 
> restrictive above 4500RPM and about 400HP/Ft# limits. I know, I'm running 
> 3 of them in different states, and have done quite a bit of research. Read 
> Lingenfelters SBC book before your attempt this to know the limits and 
> what you need to do to circumvent the limits before you sink $$ down this 
> hole. TPI works great on 5L, which is what it was originally designed for, 
> and was retrofitted to 5.7L but low RPM setups and prompted the GM venture 
> into the LT/LS development to achieve higher RPM powers
>
> ----- Original Message ----
> From: Travis Eighinger <teighinger at zoominternet.net>
> To: gmecm at diy-efi.org
> Sent: Wednesday, May 31, 2006 12:48:13 PM
> Subject: Re: [Gmecm] Fw: TPI on a 412sbc
>
>
> Th400 transmission and 1227165 ecm
>
>
> ----- Original Message ----- 
> From: "Mark Romans" <romans at starstream.net>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, May 31, 2006 1:41 PM
> Subject: Re: [Gmecm] Fw: TPI on a 412sbc
>
>
>> What year ecm?  What trans?
>> Mark
>>
>> ----- Original Message ----- 
>> From: "Travis Eighinger" <teighinger at zoominternet.net>
>> To: <gmecm at diy-efi.org>
>> Sent: Wednesday, May 31, 2006 10:30 AM
>> Subject: [Gmecm] Fw: TPI on a 412sbc
>>
>>
>>
>> ----- Original Message ----- 
>> From: Travis Eighinger
>> To: diy_efi at diy-efi.org
>> Sent: Wednesday, May 31, 2006 1:25 PM
>> Subject: TPI on a 412sbc
>>
>>
>> I want to put TPI on a 412 I built. It has ~450hp and 530ft.-lb. The
> engine
>> will never see more than 6000 rpms. I wanted to know if anybody has a
>> starting point for ecu program or any suggestions. Thanks
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>
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