[s-cars] Sharp turn toward S-car info ahead! Warning!

Sun Apr 29 23:05:34 EDT 2007

Has anybody figured out how to fix the "reliability" problems some have been
seeing with the ball bearing turbos?  It would seem to me that Garrett would
not want these things to continue to drive people away from their product.
If I recall right I have heard of two people having problems with the 2871
or 3071.  Are there lots of others?  On the other hand, is there anybody who
can vouch for the BB turbos going over 50k?

This area of discussion is very important to me because it may ultimately be
this that decides whether I keep my UrS or not.  I want more power than the
K-24 offers but I don't want a higher boost threshold, not even by 300
rpm...only solution I know of are the BB turbos, specifically 2871 in this
case,  (or a 2.5L but that's not in the financial plan at this point).
However, if the BB turbos aren't reliable then I am probably going to have
to take the plunge and go with a B5 which would suck to give up all the
things that are better about this car......*sigh*

--Calvin

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Eric Phillips
Sent: Sunday, April 29, 2007 3:59 PM
To: Steve Eiche
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Sharp turn toward S-car info ahead! Warning!

Thanks, Steve.

I wanted to get the perspective of a few different software suppliers,
just for my own education, and so that I don't buy stuff that won't
work, or that will only work with a lot of tweaking.

One of the reasons I decided to step up to RS2 is because it seems
like that is about the stock limit of the AAN before you have to start
reworking the bottom end.  That, and the bolt-on nature of the stuff.
On top of all of that, it's a proven solution that very robust, like
you say, AND the software exists off-the-shelf to make it work
properly in a Motronic environment.

I am a fan of journal-bearing turbos, precisely because they are so
robust.  That's why I had merely considered the GT2871, and wasn't
really pining after it.  The idea of full boost by 2400 rpm is
interesting, but I'm a "drive around without boost" kind of guy - I
can drive all day long without ever exceeding 14.7psia MAP.  RS2 is
nice, because then, I can get around a little faster without getting
into boost, since the boost doesn't come on until about 3-3.2k RPM.

But then, if and when I want it, I can throw all kinds of HP around
for fun and profit.  :)

I appreciate your insights,

Eric

On 4/29/07, Steve Eiche <seiche at shadetreesoftware.com> wrote:
> Comments in text below.
>
> Eric Phillips wrote:
> >> Date: Sat, 28 Apr 2007 15:27:57 -0600
> > Steve - I don't know about that, but I do have a couple of S-car
> > software questions.
> >
> > I have, right now, MRC Stage 2.  I have, in my Rossatobin, a nice RS2
> > exhaust manifold, some good, used RS2 injectors, and have a line on a
> > good, used RS2 turbo.  I could also buy a GT2871.  (Minor
> > permutation).  I have heard several opinions on how to proceed from
> > here, but I was wondering if you give me a little more info on some
> > stuff.
> >
> > 1.)  I'm going to install a Bosch 005 fuel pump this summer, and plan
> > on using the stock fuel pressure regulator.  Will the software
> > (whichever software gets used) know that the fueling is good all the
> > way up to WOT?  I hear some software has WOT enrichment at WOT/high
> > RPM to make up for fuel delivery problems under those conditions.
>
> That all depends upon the condition fuel supply system of the car that
> the software was tuned for originally.  IMO, I don't think adding fuel
> to try to make up for a fuel delivery system that isn't up to snuff is a
> good idea.  Better to fix the fuel delivery issue or to limit output to
> a safe sustainable level. YP(philosophy)MV.
>
>  From my data, the commonly available software out there for the RS2
> configuration will run within 5hp and 5lbsft of torque.  Testing was
> done with an RS2'd S6 with FMIC and RS2 components in Denver on a
> Superflow dyno.  Also IME, if you change from the RS2 injectors (say
> RCs, Lucas Delphi, etc.) and try to run generic RS2 software on your AAN
> your results will vary more widely, but generally will not be as good.
> As of yet, I haven't seen an injector that has the same flow
> characteristics as the RS2 injectors.  Note that I do NOT have
> experience with any of the new Bosch plastic body injectors which very
> well may work well.  There may also be software out there designed for
> specific injectors other than RS2s, but I don't have experience with
> that either.
>
> Also IME, I would go with the RS2 turbo for durability's sake alone.
> You will give up a little performance to a Garrett perhaps, but it fits
> without any modifications and lasts forever.  The same cannot be said
> for Garrett turbos.  I know of several AAN that have used RS2 turbos for
> without any issues for over 100k miles.
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