[Gmecm] Help me get my LT1 a new sticker

[David Allen]

See if this goes through!
David
  ----- Original Message ----- 
  From: pmkls1 at yahoo.com
  To: David Allen
  Sent: Thursday, September 15, 2011 9:44 AM
  Subject: Fw: [Gmecm] Help me get my LT1 a new sticker


  David,
  I have sent this reply to the gm ecm mailing list twice but for some 
reason it will not go through. Could you pass it on for me please ? And in 
case this does go through, E85 produces significantly less CO, NOx, and 
hydrocarbons. The reduction of these should be significant enough to negate 
the need for a catalyst to pass the test.

  Connected by DROID on Verizon Wireless


  -----Original message-----

    From: "pmkls1 at yahoo.com" <pmkls1 at yahoo.com>
    To: Ron Gregory <ron at gregoryusa.net>, gmecm at diy-efi.org
    Sent: Thu, Sep 15, 2011 01:31:40 GMT+00:00
    Subject: Re: [Gmecm] Help me get my LT1 a new sticker


    If you have access to E85 then not only will you get it to pass 
emissions testing but you will also not want to run gas in it ever again. I 
suggest that you run the car as low as possible on gas at home and fill up a 
five gallon container with E85 and then put it in the car once you have it 
as close to empty as possible. For a starter tune, take your normal tune for 
the car and increase the injector constant 30%. You will also want add a few 
degrees of timing advance across the entire table. That will get the car up 
and running and probably pretty well too. Before you begin to alter the fuel 
maps any you will need to run at least a tank of E85 through the car to 
ensure the alcohol content is as close to what is at the pump ( it is 
probably 85% there right now but it does range from 70-85% ). From there 
just watch your fuel trim values and alter the fuel map to suit. If you end 
up wanting to play with the E85 ( which I think you will ) I will give you a 
few pointers. First, you will  need to richen up the AE and PE tables a 
little to avoid hesitation. Second, you will need to mess around with the 
ignition timing, but keep in mind that E85 likes more advance however you 
can easily hurt power by adding too much advance and not know because in 
that engine you will not experience detonation with E85 no matter how much 
advance you add. Also, you will have to add more fuel to your cold starting 
tables avoid extended cranking and bad hesitation in cooler weather ( if it 
gets into the 40's or below). With that info in hand you now know more than 
enough make the car pass emissions and make more power. Please pardon my 
grammar as I sent this from my phone.

    Phil

    Connected by DROID on Verizon Wireless


    -----Original message-----

      From: Ron Gregory <ron at gregoryusa.net>
      To: gmecm at diy-efi.org
      Sent: Wed, Sep 14, 2011 17:32:52 GMT+00:00
      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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