[Gmecm] Help me get my LT1 a new sticker

[Avery Nisbet]

Can you get us a list of the required output?  or what they expect to
see for a pass with the sniffer?

I don't think you will pass with out cats.  Besides if you get caught
driving with out one its a Federal crime not something to be taken
lightly.

Get some high flow cats. The nicer ones don't cause much back pressure
at all. You wont even notice they are there.


-Avery

On Tue, Sep 13, 2011 at 8:56 PM, Ron Gregory <ron at gregoryusa.net> wrote:
> 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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