[s-cars] IA vs MTM

[linust at mindspring.com]

One more thing to consider...

The stock chips in our cars are of higher grade than your off-the shelf
consumer-electronics, or even industrial-grade semiconductor.  Stock chips
were spec'd to cover the conditions found in automotive use--more extreme than
you'd think.

When Ned reprogrammed my 200q20v, he tried to reuse the original chips...One
of them reprogrammed fine, the other one wouldn't go to zero, so couldn't be
reused.  Ned used another chip instead, though not the same manufacture as OE.
 Although he'd had success using this chip in the past, in my car, the ECU
apparently runs hotter than in others...result:  once hot (appx 45+minutes run
time), the chip didn't deliver its code properly, and my car wouldn't run
properly.

As for socketing/soldering to the board, I don't know what Ned does with the
S4.  My understanding is the early S4s had sockets--IIRC, my 200q20v did too,
but no matter--Ned removed them and put his own "socket" in place, a
timing/scrambling device of some kind, so putting stock chips back in would do
no good anyway.  Those in the know could probably get around it, otherwise
keeps the rest of us from pirating his chip.

--Linus
'91 200q20v


On Sat, 22 Jun 2002 14:13:49 -0400 Robert Pastore <rpastore at animalfeeds.com>
wrote:

There is no flash tecnology in these the UR-s motronic (as there is in the
new cars.)   The chips physically need to be desoldered, erased &
reprogrammed -- or just swapped out for others, and then resoldered to the
board.  Most tuners solder a socket to the ECU board, then the eprom just
pressed into the socket. This makes subsequent chip swaps are quick and
easy, and also keeps the soldering heat off of the chips.   Ned solders the
chips right back into the board (saving the $2x2 = $4) in sockets, and at
least *USED TO* use some kind of epoxy or silicone caulk to glue the chip to
the board.  This is a huge PITA if you ever want to remove your chips and
makes it very easy to damage your ECU if you try without the right tools.
One of the two eproms used is rather rare and out of production, so I think
Ned is smart to save them instead of giving them back where they will
clutter your house,  eventually to be thrown away by your wife when she
clean the junk drawer.


Bob



-----Original Message-----
From: chris chambers [mailto:fastscirocco_2000 at yahoo.com]
Sent: Wednesday, June 19, 2002 11:26 AM
To: Dave Forgie; s-car-list at audifans.com
Subject: Re: [s-cars] IA vs MTM


I do not know if Ned reprograms the chips on the
board, or what. But I did ask him if our OEM chips
could be returned to us with the ECU and he said no.
He re-uses them to help keep costs down.

Chris


--- Dave Forgie <forgied at direct.ca> wrote:
> S-gruppees:  One other consideration for the IA vs
> MTM vs Lehmann
> debate:  I believe Ned reprograms the original chips
> on the ECU (i.e. he
> does not add sockets and new chips).  I believe the
> others to supply
> actual chips and add sockets.  As a result, IF you
> wanted to go back to
> OEM chips after running the new software (why you
> would do this, I don't
> know), you could with the MTM or Lehmann.  IA - I
> don't know how that
> could be done.
>
> Dave (chipless on the sidelines) Forgie
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list


=====
93 Audi S4
91 Mitsubishi Eclipse GSX
85 VW Scirocco 2.0 not stock :-)
73 Porsche 914 2.0 (67,000 original miles)


It's not how much you make, but how much you don't spend!

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