MTM chip

[Claus Vegener]

I was running IA stage IV or V with a Garrett T04/50
turbo, RS2 injectors and MAF and IA exh manifold.
The 2.7 Bar abs is the max close to 4.000 rpm with a
programmed falling slope to 2.2 at 7.000.
But I had problems with over-boost.
You can see the dyno testruns at
http://home7.inet.tele.dk/vegener/page3.html
http://home7.inet.tele.dk/vegener/page23.html

After running the kkk24 springloadet to 2.3Bar abs
I changed over-night to the Garrett after it returned from service.
w.o other change the measured boost fall to 2.1 Bar and the performance
measured with the G-Tech Pro changed from 0-60 Mph
5.54 sec to 4.96 sec due to the fact, that the loss is smaller at the bigger
turbo giving cold air.
Later I raised the boost to 2.6-2.7 bar but quite often the overboost fuel shutoff
gave me problems.

I think, there is a problem with the ceramic thrust ball bearings in the compressor house.
They are very sensible, but that's another story
Claus
----- Original Message -----
From: "Mihnea Cotet" <mik at info.fundp.ac.be>
To: "Claus Vegener" <vegener at post7.tele.dk>; "Richard Tanimura" <Richard at Tanimuras.com>; <t44tq at mindspring.com>; <200q20v at audifans.com>
Sent: Monday, October 21, 2002 10:50 PM
Subject: Re: MTM chip


> Claus,
>
>
> Was that 2.7 Bar overboost or continuous pressure? If so, what turbo were
> you running?
>
>
> Thanks,
>
>
> Mihnea
>
> At 18:47 21/10/2002 +0200, Claus Vegener wrote:
> >Unfortunally (very) I agree.
> >Last time I was on the roller tester with my 3B and 2.7 Bar abs
> >we noticed some ripple and very short down-spikes at the power-curves.
> >Typical ignitionproblems my speed-shop said.
> >A week later I blow my engine running nitrous probably due to a backfire -
> >or not firing at the right time.
> >I go for a EngineManagementSystem with 5 coils, userprogrammable for my
> >next power-engine.
> >This could be based upon a 3B - but not with a rotor distributor  and
> >single coil.
> >Just my experience -
> >Claus
> >----- Original Message -----
> >From: "Richard Tanimura" <Richard at Tanimuras.com>
> >To: <t44tq at mindspring.com>; "'Mihnea Cotet'" <mik at info.fundp.ac.be>;
> ><200q20v at audifans.com>
> >Sent: Monday, October 21, 2002 5:20 PM
> >Subject: RE: MTM chip
> >
> >
> > > Taka,
> > >
> > > Can you expand on that. Why is the ignition system the limiting factor?
> > >
> > > Curiouser and curiouser :-)
> > >
> > > Rich
> > >
> > > -----Original Message-----
> > > From: 200q20v-admin at audifans.com [mailto:200q20v-admin at audifans.com]On
> > > Behalf Of t44tq at mindspring.com
> > > Sent: den 21 oktober 2002 16:09
> > > To: 'Mihnea Cotet'; 200q20v at audifans.com
> > > Subject: RE: MTM chip
> > >
> > >
> > > Mihnea-
> > > The 3B does not support 3 bar pressure transducers- the ignition
> > > system is the limiting factor and limits the max amount of boost
> > > one can attain safely with the 3B. That is the reason why if I ever
> > > commit to serious power output, I'm going to direct ignition and
> > > AAN ECU.
> > >
> > > I prefer the Lehmann chipset- very smooth power output.
> > >
> > > Taka
> > >
> > > ---
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