[Gmecm] Help me get my LT1 a new sticker

[Thomas Martin]

Is your PCV system up to snuff?  That will make a difference too.

I have a filter off a 2.9L Ford V6 in mine that fits into the valve cover
and you cut back the PCV air vent line to connect to it.  Keeps the oil out
of the throttle body almost 100%.  Oil in the intake/TB doesn't help at all.

How is the spark plug gap?  Set it to stock, use stock heat range plugs.  If
you can, get a set of NGK TR4IX Iridiums gapped at stock gap.  They are the
OEM plug for the supercharged 3800's (2000 Park Ave Ultra for reference), AC
Delco PN 41-101, you can sometimes get them on sale.  The narrow tip helps
ease the spark gap.  It helps emissions.  They are a good solid plug.  Fresh
plugs are always a good idea, Iridium or not.



On Wed, Sep 14, 2011 at 1:42 PM, Eck, Joel <Joel.Eck at hp.com> wrote:

> Yeah, they're being really cool with it. Shop over by my house (Houston
> area) wouldn't let me leave it running while waiting. They wanted at least
> 15 minutes of cool-down time before running it on the dyno.
>
> Got any numbers to share? That might help with the suggestions... good to
> know if we're looking to reduce NOx, HC, CO, etc.
>
>
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
> Behalf Of Ron Gregory
> Sent: Tuesday, September 13, 2011 10:56 PM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] Help me get my LT1 a new sticker
>
> My son has a '95 Firebird that needs to pass the Texas IM240 dyno testing.
> The vehicle is run on a dyno at 15 mph and 25 mph while sniffing the
> tailpipe.  The car has long-tube headers, no EGR, no air pump, 160-degree
> thermostat, and an empty cat-con.
>
> Last August, I played with the tune a bit, but couldn't get the car to pass
> without installing a new cat-con *and* a special tune. This year, I'd like
> to try [with your help] to pass with an empty cat-con.
>
> The TunerCAT .bin and .txt dump files of the tune that finally worked last
> year are here:
>
>    http://oldpizza.net/formula/2010_08_25_austin_firebird_emissions_5.bin
>    http://oldpizza.net/formula/2010_08_25_austin_firebird_emissions_5.txt
>
> I had to mess with the timing, injector constant, and finally the shift
> tables, so it would stay in 1st gear for the 15 mph reading and 2nd for the
> 25 mph reading.
>
> The shop is really cool about it. They will actually let us install another
> PCM before we put it on the dyno, so we won't have to actually drive
> highway
> speeds with this tune.
>
> Any ideas on how to cut emissions down enough to pass "the test"?
> Do I have a snowball's chance in August of passing without a cat-con?
>
> I know where I can get some E85.  Would that help?
>
> Ron
>
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