[Biturbos4] After-run thermoswitch modification

Al Adler adlere at sourcecodecorp.com
Fri Nov 16 11:00:43 PST 2007

I guess if you use your car daily it wouldn't be that much of issue. I
don't use the car daily or even weekly sometimes so I have examined the
situation in more detail. Its a pretty hefty pump and the radiator fan
also runs as well. Based on my back of the envelope calculations that I
did I'd estimate that the whole setup uses about 20-30 % of the 70 AH in
the stock battery before it turns off. If your battery isn't fully
charged to begin with(my car doesn't get a lot of use), you can run the
battery fairly far down that way which will shorten the life of an old
school battery like the stock battery. Plus then there is that much less
juice in the battery to support the parasitic loads of the alarm and
other hot circuits while the car sits so then they run the battery down
further than is good for long life. I replaced the stock battery with an
Odyssey AGM battery, they're designed for that sort of use. Not quite an
exact fit though...

As always,

j.koenig wrote:
> I'll add my thanks to Ti for the heads-up.
> Al, if I understand correctly, the mod just runs the pump at a lower temperature range. 
> That shouldn't have any influence on the battery's ability to hold a charge while sitting, 
> should it?  I think you had a bettery on its way out, and experienced a coincidence.
> John
> ----- Original Message ----- 
> From: "Al Adler" <adlere at sourcecodecorp.com>
> 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.
> Al 
> _______________________________________________
> Biturbos4 mailing list
> Biturbos4 at www.audifans.com
> http://www.audifans.com/mailman/listinfo/biturbos4

More information about the Biturbos4 mailing list