[Gmecm] More '730/$8D tuning questions...

[Mike Wilson]

Clair, it sounds like you are on the right track with what you are thinking.
A fairly stock program for a TPI F-body is probably a good starting point
for a lot of older muscle cars to use as a base program. The Vette programs
are too aggressive and fine tuned for their application to make them easy to
retrofit into another application.

The TPI intakes have a lot to do with the high VE numbers. The velocity they
generate gives amazing amounts of low end torque. They run out of steam
really fast but low end is fantastic. This is great for a street car but not
for racing. Most TPI powered cars end up highly modified if the owner gets
into drag racing, like mine. I eventually ended up running a Victor Jr.
intake that I converted to fuel injection. My big valve 409 inch small block
was just too much even for the best of the aftermarket TPI intake parts that
I tried.

Good luck with the tuning,
Mike

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Clair Davis
Sent: Tuesday, April 17, 2007 7:28 PM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] More '730/$8D tuning questions...

Thanks for that suggestion, Mike, that's an interesting looking bin.  The VE
curves have a very similar character to what mine could/should be on the WOT
end, but it still floors me that VE can be so high in the idle range - over
60 at 800rpm!  My lean-best-idle appeared to be in the low-mid 40's, but
that may make sense with my low 8.5:1 CR.

I'm tempted to just tweak the injector & cylinder specs, tone down the spark
advance table, and give it a spin.  If I'm thinking about this right, having
the VE's too high just means I'll tend rich with the INT/BLM's again.  If it
runs like crap, at least I have some confidence that it hasn't been monkeyed
with too much before I got it.

Clair


----- Original Message ----- 
From: "Mike Wilson" <mwilson at bwarch.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, April 17, 2007 11:29 AM
Subject: RE: [Gmecm] More '730/$8D tuning questions...


> Clair, with a manual transmission & iron heads the best way for you to get
> started is to use the 1992 5.0 liter 5-speed Camaro bin AXXC and copy the
> VE, PE, AE & cold start up info from the 350 auto AUJP bin into the 305
bin
> plus change the cylinder volume & injector flow rate and disable VATS.
>
> You may want to pull more timing out because of your data logging on your
> specific engine but this should get you a lot closer to a drivable engine
to
> start with. With a good manual transmission iron head base program you can
> then tune for your cam and headers and modify the rest of the program to
fit
> your application.
>
> I did this when I put a T-56 into my 91 5.7 TPI Z/28 and it worked very
well
> but my engine was otherwise stock so I only had to deal with the manual
> transmission issue.
>
> Hope this helps,
> Mike
>
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf
> Of Clair Davis
> Sent: Monday, April 16, 2007 8:38 PM
> To: For discussion of GM EFI hardware and software
> Subject: [Gmecm] More '730/$8D tuning questions...
>
> ... 3) Is there a benefit to using a different base cal, such as ANHT vs.
> AUJP or whatever, as long as they're for essentially the same family of
> engines?
>
> Thanks in advance as usual, and I really am glad to be able to drive this
> old girl again, as frustrating as it is at the moment.
>
> Clair
> 69 Plymouth Valiant, 340+730
> Fort Worth, TX
>
>
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