7730 ARDC, AZTY, and other V6's

[TK]

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.
>
>--
>
>
>