VATS Bypass

[Mike Pilkenton]

Actually this is not the problem Bruce.  The ECM doesn't care if the EGR is
there or not , it's the fuel/air ratio of mofdern day engines (I believe
about 14 to 1 vs 12 to 1 with older non EGR engines) that poses the problem.
With this leaner mixture, the engines can run much hotter and rely on the
EGR system to reduce this heat.  Without going into the chemistry, the
exhaust gas recirculated into the intake not only reduces emissions but
reduces cumbustion temperatures as well.

    So without the EGR, I must richen up the mixture (theoritically) to keep
from burning up pistons.  I'm not an expert but this is what I've been told
by several professional mechanics.

Mike
-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, December 20, 1998 10:14 PM
Subject: Re: VATS Bypass


>
>-----Original Message-----
>From: Mike Pilkenton <mpilkent at ptw.com>
>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>Subject: Re: VATS Bypass
>
>
>>That was me!  I have a 92 3.1L v6 Camaro motor that I want to eliminate
the
>>VATS as well as the EGR system due to a custom exhaust I have to
fabricate.
>>I was told that I must richen up the A/F mixture if I run without the EGR
>or
>>I will burn up the pistons/rings eventually.  Anyone heard of this?
>
>If there is no way to keep the egr intact, then you'll have to turn off
>it's diagnostics, or trick the ecm into thinking it's there.  Might need to
>use like a 4066 running off the egr apply solenoid signal to trigger
>a voltage divider on the MAP signal.  Assuming this is a MAP system.
>Bruce
>>
>>Mike Pilkenton
>>
>>-----Original Message-----
>>From: Bruce Plecan <nacelp at bright.net>
>>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>>Date: Sunday, December 20, 1998 3:00 PM
>>Subject: VATS Bypass
>>
>>
>>>Someone needed a 55 circuit for a VATS bypass, please e-mail
>>>me,
>>>Bruce     nacelp at bright.net