[s-cars] RE: MTM ECU Problem (LAC)

[Mihnea Cotet]

Douglas,


You possibly have to or you don't.

My point about that is that the engineer whom I have
all my Motronic knowledge from always does the
software on basis of the stock chips, even though Mr.
Feico van der Laan says all AAN chips are
interchangeable. I know the chips are basically
interchangeable (except for the 551A ECU's chips) but
when it comes to fine tuning (like one could only do
with an EGT and a WB O2 sensor) there are small
differences that make a chip made for a different ECU
(and software version) won't give the expected
results.
This is also how I tune all cars that I tune,
furthermore, I always prefer to individually tune all
cars if it's possible (and it's even possible to do it
by email), that is to say to correct the tuned values
based on EGTs and O2 readings vs. boost and RPM. Not
all ECUs respond the same to tuning and there are also
tolerances in the pressure transducers which "generic"
chip tuning can't compensate for.

DISCLAIMER **** BUT this is only my opinion and the
way I work **** DISCLAIMER

I don't intend to kill Anderson's or MTM's business
over there in the US but some things they find fine
IMHO aren't, period.
If by chance the ECU you got from them corresponds to
the chips they've put in it, then it's fine, otherwise
there *might* be issues no one will be able to explain
but this is none of my business actually... but rather
Hoppen/Anderson's...


HTH,


Mihnea, tuning various 20VTs around the world :-)


--- "Fifield, Douglas" <Douglas.Fifield at TENNANTCO.com>
wrote:
> Mihnea wrote:
>
> "Mark/all,
>
> Software revisions don't have anything to do with
> VIN #s. On the same year
> S4, I've seen up to 3 different ECU #s and about 3
> or 4 different software
> revisions. As far as total software revisions (for
> S4/S6s, if I have to
> count S2/RS2, then there are even more out there),
> there are about 6 or 7
> of them, and I only have 5, though I could find the
> missing ones even if
> there's no actual point in that...
> The point about software revisions/ECU numbers is
> that software versions
> are made for a certain ECU number and even though
> one can use 551D chips in
> a 551AA ECU, the result won't be the same because
> the software version for
> the 551D chip isn't the same at all and the chips
> work differently in the
> firmware part, even though the "software" part
> (lookup tables) are about
> the some...
>
> The motors are identically the same, agreed on that
> one, but the ECUs
> aren't. There are a few different ECU numbers (551A,
> 551AA, 551B, 551C and
> 551D end numbers) for cars using the very same AAN
> motor.
>
>
>
> HTH,
>
> Mihnea"
>
> So, Mihnea, does that mean that if the entire ECU is
> swapped, you are OK on
> revisions?  All I know is that when I did my
> upgrade, Keith Anderson
> extracted my virgin ECU and stuck in a different one
> with the 3-bar sensor
> and two different EPROMS.  Do I need to worry about
> software revisions and
> incompatible chips?
>
> Douglas, puzzled in MN
> 95.5 //S6Avant - mine
> 98 Mercury Mountaineer - her work sled
> 98 Toyota RAV4 - for sale
> 73 BMW R60/5 - lonely in the garage
>
>


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