[Biturbos4] 2000 S4 Running Hot

[j y]

R,
 
I mentioned in my msg to you last night - ONLY THE EARLY S4s (like mine) had the risk of catastrophic turbo failure. It had NOTHING to do with the TYPE OF OIL USED - It had to do with a POOR turbo design (the oil inlets and ducts were too small thus restricting oil flow and its cooling ability) that was corrected in the MY 01.5 (2001.5) S4s. So, early S4s that experienced catastrophic turbo failure under, or just beyond the warranty period, were given UPGRADED (K03) replacements by AOA. 
 
YOU NEED TO FIND OUT WHEN YOUR S4 WAS BUILT. The build date should be on the side of the driver door. The build date on my S4 was 11/99. It was sold as a MY 2000 S4. I CLEARLY own an EARLY S4. There is no need for you to purchase K04s unless you plan to siginificantly modify the power, like I said in my msg to you. I hope this helps clear things up for you.


r harout <carrera3_2 at yahoo.com> wrote:
so let me ask a question (nervoulsy)

How likely is it that I was have catastrophic turbo
failure if the car has only run with regular oil--but
chnaged frequently?

Inevitable? What are the signs? I will use Mobil 1
moving forward, but the owners before me did not.

Maybe I should order the K04s now so I get them in
time for failure!

--- Grant wrote:

> Agreed. Cool is actually not good. The only
> regular failures I know 
> of are turbo-related failures in which the oil
> coked. Coking takes 
> place WAY above 200deg. If you find differently,
> please contact the 
> steel industry - they want your technology badly. 
> As to "how hot"? 
> the flash point for mobil1 is >400deg (F).
> 
> Admittedly, the hot underhood temperatures
> contribute to this, but I'm 
> nto sure how much it improves things to extract the
> heat to the 
> radiator, which then blows the heat through the
> engine bay, which .....
> 
> So who's had a turbo failure that ran synthetic,
> cooled down after hard 
> runs, and warmed up in the cold?
> 
> Anyone?
> 
> And who's had a ring job under ANY circumstances. 
> Anyone?
> 
> Grant
> On Aug 29, 2005, at 2:53 PM, costco wrote:
> 
> > A lot of research has been performed with regards
> to cylinder wear vs.
> > coolant temperature in the 70's and 80's amongst
> the automakers.
> >
> > 192 degrees F is actually optimal in most engines.
> More or less is
> > application specific. I would never put a 160
> degree thermostat into an
> > engine that prior had a 180 degree thermostat. In
> many EFI systems that
> > alone could cause the engine to run in open-loop
> "warm up" mode, 
> > running
> > excessively rich and ignoring the oxygen sensors
> for short and long 
> > term
> > fuel maps.
> >
> > I know the biturbos run 'hot' but IMO effort would
> be better spent 
> > finding
> > a way to get more hot air out of the engine bay
> than trying to get the
> > thermostat to open earlier. The biturbo RS4 has an
> extended bellypan 
> > that
> > covers some of the transmission-- this bellypan
> section is obtainable 
> > from
> > the dealer for around $120. It wouldn't take much
> to get it to bolt up
> > behind the stock bellypan, and I would definitely
> give it a try as I
> > wanted to before getting rid of my B5. I never got
> around to doing it.
> >
> > The low pressure area there will probably greatly
> help pull air through
> > behind the front tires.
> >
> > If you have a little more money to toss around I'd
> consider 
> > retrofitting
> > the RS4 oil cooler into the system.
> >
> > Next I'd eliminate the foglights, elongate the
> slits in the front
> > wheelwells to promote more air through the
> intercoolers, and replace 
> > some
> > of the front lower center grill area with
> something freer flowing yet
> > would still provide some protection from rocks
> hitting the a/c 
> > condenser.
> >
> > - Keman
> >
> > On Mon, 29 Aug 2005, Greg Amy wrote:
> >
> >> efficient. After all, we're not talking about
> mid-60's
> >> muscle cars here; these things run fine on 180F
> >> thermostats.
> >>
> >> GregA
> > _______________________________________________
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> > Biturbos4 at www.audifans.com
> > http://www.audifans.com/mailman/listinfo/biturbos4
> >
> 
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