[Biturbos4] After-run thermoswitch modification

[Al Adler]

Fyi all,
    Its a good mod for the engine- I did it a couple of years ago.
However, it does come with a downside. The stock battery that I
installed a few months before the mod died suddenly  recently, about a
year or 2 short of its normal life. I replaced it with an Odyssey that
should be able to take the load much better. Also it reduces the time
you can leave the car sitting without charging the battery to about a
week or so.

YMMV,
Al


Brandon Rogers wrote:
> Very Cool - Thanks Ti-
> I agree with your rational - I'll check this out.
>
> Thanks again-
>
> Brandon
>
> -----Original Message-----
> From: biturbos4-bounces at diablo.audifans.com
> [mailto:biturbos4-bounces at diablo.audifans.com] On Behalf Of Ti Kan
> Sent: Friday, November 16, 2007 12:20 AM
> To: biturbos4 at audifans.com
> Subject: [Biturbos4] After-run thermoswitch modification
>
>
> Hi all,
>
> I replaced my S4's after-run system thermoswitch today with a lower temp
> unit as described in this Audiworld article:
>     http://www.audiworld.com/tech/eng59.shtml
>
> The original switch (357 919 369F) operates at 112 deg.C whereas the
> replacement (021 919 369) closes at 93 deg.C and opens at 88 deg.C.
> Installation is basically as described in the article, except that the
> electrical connector retaining wire does not need to be removed.  You
> just squeeze it inward and the connector should pull right out.  The old
> switch was stubborn to come out, and the tight confines around it makes
> it difficult to get a good grip with pliers.  But I used a vice grip and
> it worked like a charm.
>
> After a long drive back from a dinner appointment, I pulled
> in the garage and shut off the engine.  Lo and behold, the after-run
> system activated.  The auxiliary radiator fan and the reverse coolant
> pump were whirring, which I had never heard before in the 8 years that
> I'd owned this car.  It ran for approximately the full 10 minutes before
> shutting off.
>
> I think this is a worthy modification, and should help extend the
> longevity of the turbos.  Not only does it circulate coolant through the
> system (including the turbos), the fan also forces some airflow through
> the engine bay to reduce heat-soak.
>
> Just thought I'd share.
>
> -Ti
>
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