[BiturboS4] Todd from AWE
erhti at yahoo.com
Wed Apr 23 08:20:12 EDT 2003
Or simply do as I do.. 'gently' drive around the block a couple
of times.. with the hood up. :-D
--- Todd Sager <todd at awe-tuning.com> wrote:
> Yes, still here though not checking in as often as I wish to.
> The pump is triggered by a thermoswitch, which is a sealed
> unit. I
> suppose by doing some parts bin engineering, a lower temp
> switch could
> be substituted, or bypassed altogether with a manual or
> external switch.
> However, while an afterrun pump is certainly a good idea, it
> is not a
> substitute for proper cool down procedure. Running coolant
> through the
> turbo will help drop temps, but the real problem is letting
> the turbo
> stop spinning when still red hot.
> Allowing the turbo to cool while idling keeps the turbo
> spinning during
> this time (as exhaust gasses pass through the turbine), which
> an imbalance issue from occurring. If the turbine is red hot
> and is
> allowed to stop spinning, the shaft can distort from the
> weight of the
> turbine wheel.
> There is no conclusive evidence why the K03s fail as often as
> they do,
> nor is there evidence that the "updated" parts have cured
> The failures are as varied as compressor wheel damage, turbine
> failures, and seizing. These can all be caused by overheating
> operation, improper oiling, or improper cooldown.
> Our recommendation to customers is to either allow a 2-3
> minute cooldown
> at idle after high boost application, or a gentle no boost
> cruise for
> 1-2 miles before shutdown. No question that this becomes even
> critical when increasing the boost with a chip.
> "Marc A. Abernethy" wrote:
> > Todd are you still on this list. A couple of days ago we
> > discussing turbo timers and the Audi after-run pump. Are
> you guys at
> > AWE able to come up with a new thermostat for the S4s
> after-run pump?
> > So it will come on at lower temps. This seems like it might
> be simple,
> > then again I have no idea to to it.
> > Any thoughts?
> > Marc
> > _______________________________________________
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> > BiturboS4 at audifans.com
> > http://www.audifans.com/mailman/listinfo/biturbos4
> If you have any questions, please do not hesitate to contact
> Todd Sager
> A.W.E. Tuning
> Orderline 888-565-2257
> Be sure to check out our latest ad in the April issue of
> European Car
> BiturboS4 mailing list
> BiturboS4 at audifans.com
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