7730 ARDC, AZTY, and other V6's

[Mike Pilkenton]

This is true.  I have heard from amny experts that when you disable the EGR
you must then increase the A/F mixture some to reduce pinging/detonation.
Not sure if this is normal for the ECM to do when the EGR function is off
anyway or if some additional programming of the tables is required??

Mike Pilkenton
-----Original Message-----
From: TK <terryk at foothill.net>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Monday, July 05, 1999 11:29 AM
Subject: Re: 7730 ARDC, AZTY, and other V6's


>EGR reduces ping too. Noticeable at cruise at light to moderate loads. The
>V6 2.8/3.1L really demonstrate this.
>
>Terry
>-----Original Message-----
>From: rr <RRauscher at nni.com>
>To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
>Date: Monday, July 05, 1999 11:19 AM
>Subject: Re: 7730 ARDC, AZTY, and other V6's
>
>
>>Doug wrote:
>>
>><snipped good info>
>>>easier it becomes like a puzzle.   I did find the min. temp for the EGR.
>I
>>>will set this to $FF.  That is the best way to disable it, because it
>>>causes the calculations to work correctly.  Right now I just blocked the
>>>EGR tube  and the computer was happy (no light).  The address in mine was
>>>$8E8B = 66c = 154F,  if I am right.....  I am surprised that not many
>>>people realize what a performance and gas milage killer the EGR is.
There
>>>is no benefit of it that I can tell.
>>
>>Well, the benefit is lower NOX emissions. But, I was surprised at the
>>performance increase. Was totally unexpected, and started myself
>>thinking, which can be dangerous in it's own right. The egr ducks-out
>>with the smallest amount of acceleration, so why the performance
>>difference?
>>
>>Maybe it has to do with lowering the heat input to the engine. The
>>intake
>>tract will run cooler, so you should be able to get a cooler charge. The
>>other will be how dirty the throttle body gets, or lack thereof. These
>>things get filthy, causing all kinds of problems. The only thing adding
>>grime is the egr, and wow, does it! (ever clean a TB, it's looks like
>>the
>>inside of a sewer pipe {don't ask})
>>
>>Maybe timing lag, as the SA is lag filtered with the egr?
>>
>>>     OK I just looked at the AZTY.  Look at address $4494 and following
>>>(which is actually $C494).  It looks like the coolant is address $4D (in
>>>mine its $4B) and that is compared to $8EEF.  That should be the min EGR
>>
>>Dead on Doug <g>, I changed the $8EEF to 0xff, and the egr doesn't come
>>on. Also disconnected the wires to it, and checked for trouble codes,
>>none. Looking good...
>>
>>>temp.  Also AZTY is the same on the EGR bit which is $2B,#10.  I think
>that
>>>is the EGR on/off.  Look at this and see if I am right.  All or some of
>>>this could be wrong.  hehehe...............Anyway all of my notes are
hand
>>>written on the printout.  maybe I could copy them later on and then scan
>or
>>>mail them to you all somehow....if I can be of help let me
>>>know................doug
>>
>>
>>BobR.
>>
>>--
>>
>>
>>
>