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

Thu Apr 19 01:24:54 UTC 2007

I've got some more comparing to do tonight.  I uploaded the lightly-tweaked
AXXC when I got home from work, and it almost instantly turned on the
CEL/SES/whachamacallit light, so I couldn't get an idea of how it would even
idle.  Swapping in the untouched AXXC did the same thing, but it cleaned
right up when I reloaded the bin I was driving with last weekend.  I
couldn't even get the ALDL to synch up until the last bin was loaded.

Once I get a bit more sorted out, I'll need to pick your brain on the finer
points of tuning with a large volume short runner intake.  That's
essentially what I have on my 340, one of the Mopar Performance M1 series.
I've also got a large direct-linkage 4V throttle body that I'm going to have
to work with, too.  PE and SA ought to clean those up, though.  And good
point on the TPI intake, I forget how well it worked.  The early Chrysler
long-ram and short-ram engines would generate over 100% VE even back in the
day, but I don't think they were as much of a treat off idle.  I'll keep
that in mind.

Clair

----- Original Message ----- 
From: "Mike Wilson" <mwilson at bwarch.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, April 18, 2007 10:26 AM
Subject: RE: [Gmecm] More '730/$8D tuning questions...

> 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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