[BiturboS4] altitude and boost (was ice racing)

Matt twentyV matt_20v at yahoo.com
Mon Feb 3 17:04:44 EST 2003

> Keep in mind, though, that not all Californians are
> limited to sunshine and
> dry pavement. Many of us here in San Francisco drive
> 3 hours away to Lake
> Tahoe in the Sierra Nevadas for some
> skiing/snowboarding on the weekends - so
> we get a bit of snow driving :).

Some fun for sure the last couple weeks of December.
But since then, nada.

> 6,500 feet, the idling vacuum is different....and
> the boost is summoned much
> sooner!  Anyone else live at altitude?  How does
> this affect chipped turbos?
> More wear?

There should be an altitude sensor that causes the
ECU to reduce boost to prevent turbo over-spin.
I suspect the earlier boost you see is not controlled
directly, but rather is because the throttle input
requested can't be met without pressurizing the thin

Matt Rooke
San Jose, CA
'91cq- 20Vt; retired to coastal driving & track days
'00S4- 30Vtt; Tahoe ski car

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