MTM chip

Mihnea Cotet c_mihnea at
Mon Oct 21 04:48:02 EDT 2002


I somehow agree with you on some points, but please
admit that chips can work very well with a stiffer WG
spring as well... In Germany and in Europe in general,
MTM are considered as one of the best I5 tuners and
it's not for nothing! I know nothing about APR or
Garrett but as only MTM/Abt/Hohenester/Lehmann are
available in Europe I talk about what I know. Then,
you always come up with the argument that the ECU
can't limit boost in case something goes wrong if you
use a stiffer WG spring, well, it can't take boost
back to 1.4 Bar as with the stock spring but the
springs that one of my friends is using only produce
1.6 Bar when the ECU shuts the WGFV, which is not very
dangerous IMHO... and my point on this is that if
you're not aware of the potential damage caused by
something going wrong in a 20vt engine and if you
don't have a boost gauge, then you simply don't need
any performance upgrades!
Next up, what do you know about the exact software
version MTM was using? Did you ever see the data
inside the chip to be sure it's a real MTM? Don't
forget the US cars have the coding plug that has more
than little to do with the US emmission norms and fuel
quality... It's possible that the version you're
talking about has never produced any kinds of problems
when used with the proper 98 RON gas and with the
coding plug removed (euro-setup)... Anyway, when
talking about socketed 3B chips, please let me tell
you that the 3B engines never ever got an ECU other
than the Bosch 0 261 200 451 and 453. I've opened
about 10 of them coming from different countries and
I've never seen any soldered chip in them, they all
have the sockets and the plastic retaining clip on
them. Now if you're talking about chips other than
EPROMS inside the ECU I agree that they are soldered
but they don't influence the engine tuning in any

And please don't tell me I'm pugnacious when I simply
tried to make you admit that there are some other
systems than those you are using and that they can
work as well as yours! If you want to talk about
actual ignition/injection parameters inside the chips,
I'm ready to answer your questions anyway!


--- Brett Dikeman <brett at> wrote:
> At 7:06 AM +0200 10/21/02, Mihnea Cotet wrote:
> >Huh? So you mean that MTM who sells and installs WG
> springs on their
> >customers' cars aren't doing their job properly
> now?
> Well, actually, yes.  Early versions of the 3B chips
> from MTM
> required springs because the code was faulty.  Later
> revisions don't
> require it.
> Ride in a car with the early code, and you'll notice
> distinct boost
> spikes/surges.  Namely, three.  Particularly
> noticeable at highway
> speeds.
> >>>. I have read nothing about this chip and thought
> that the chips
> >>>were soldered into the computer.
> >>
> >>They are.  Some vendors install sockets, however.
> Still, soldering
> >>is required.
> >
> >Nope they aren't !!!!! AT least on the 3B ECUs they
> have never been
> >soldered and never required unsoldering, and even
> some UrS4 ECUs
> >that I've seen (they had never been opened, one of
> them was brand
> >new from Bosch) had sockets in them. So one more
> time you're wrong
> >Brett!
> Take a look at:
> The S-car ecu in the second set of photos clearly
> has soldered ROMs.
> The 3B pictures show a plastic guard over the ROMs,
> which might be in
> place to secure the chip in a socket.  There could
> be multiple
> versions as well.
> Your observations of european 3B ecus could have no
> bearing on US
> ecus which, among other things, were produced a year
> later.
> >>>  The IA chip w/ the stiffer wastegate spring
> seems to be the
> >>>favorite of this and other groups
> >>
> >>IA does not sell stiffer wastegate springs for the
> 20vt.  They are
> >>100% unnecessary with a proper chip.
> >
> >That's not true! MTM sells 2.5 and 3 Bar chip
> upgrades for the 3B
> >AND install stiffer WG springs without their
> customers necessarily
> >knowing about that! A 15$ spring would be a too
> easy improvement if
> >everyone knew it, think a little! I've seen the
> real MTM "Fat 'n'
> >Low" UrS4 that had a stiffer WG spring from MTM in
> it, now what do
> >you say to that?
> Well, I'd say that MTM is not the final authority in
> Audi tuning,
> given that Ned's chip works flawlessly minus any
> sort of spring
> shenanigans.
>    Among other things, their chips in all the
> current Audi turbo
> models fall very flat of APR's work.  I don't
> believe I've ever heard
> of an A4 or S4tt owner with MTM chips- most everyone
> goes with either
> APR or Garret. APR has the dyno charts to prove
> their numbers, and
> their numbers are a whole lot better.  Garret has
> probably the
> strongest reputation around for custom chip
> development.
> You and I have had the why-20vs-don't-need-springs
> discussion and I'm
> not going to rehash it further...especially with
> your pugnacious
> attitude.
> Brett
> --
> ----
> "They that give up essential liberty to obtain
> temporary
> safety deserve neither liberty nor safety." - Ben
> Franklin

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