Re: EPROM Programming

["David Posea" <dposea@mindspring.com>]

In light of Shannon's reply, I hope I'm not being a pest. I'm new to the GM
tuning scene, so please forgive me if I ask the tuning equivalent of "what
exhaust should I use". If I ask too many basic questions, someone please
correct me.

Thanks,

David Posea
-----Original Message-----
From: Shannen Durphey <shannen@grolen.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: Thursday, August 03, 2000 9:39 PM
Subject: Re: EPROM Programming


>WEG1192@aol.com wrote:
>>
>> Hello All,
>>
>> I am interested in modifying my GMECM EPROM. I have read Programming 101
and
>> the tuning tips. So is it as simple as getting an EPROM burner, getting
>> tuning software like Tunercat, getting their chip TDF file for the ECM
that I
>> have, making the changes, and then burning the chip?
>Yes, in the same way that building a good engine is as simple as
>buying tools and parts, then putting them all together.  The mechanics
>of actually "modifying the chip" are extremely simple.  The magic is
>in making a good chip, which will take time.
>
>>Will the .bin files on
>> the DIY-EFI site work without any changes?
>Yes, they will work exactly as designed in the same application they
>were designed for.  Anything else is just a guess.
>
>Or do I have to remove the VATS
>> and EGR functions?
>You need to disable or bypass VATS when the application calls for it.
>The same is not always true for EGR
>
>In reading the tuning tips by Dr. Bruce Plecan, it appears
>> that you make a change, drive the car, then make another change. Isn't
that
>> very time consuming since you have to reburn the chip every time, or is
he
>> using some real time program he didn't mention?
>
>Yes, it is very time consuming.  That is why the people that have
>burned so many chips have such a thorough understanding of what it
>takes to make a "good" chip.  That is also why some people here lose
>patience with list members that don't want to spend even a little time
>looking for info.
>
>>
>> Last, does anyone know if the fuel pressure on a TBI system changes with
>> engine vacuum like it does on a TPI system?
>For GM systems, generally no.
>
>You're asking about 14 years worth of systems.  To put your question
>into perspective, asking about disabling VATS is like someone asking
>if they have to remove the front driveshft in their Jeep, with no
>other info about the Jeep, or the use it will see, or the reason they
>want to remove the driveshaft.
>
>Have you got a swap in mind?  Are considering TBI or TPI?  Are you
>looking at any particular donor vehicles?  This type of info might net
>more better answers for ya. : )
>Shannen
>>
>> Thanks for the help.
>>
>> John Wilson
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