Re: FI questions

[EICHSTEV@aol.com]

Phil wrote:

>> Altitude compensation really isn't necessary unless you're running at the
>> limit of the turbo.

> 'Tain't what the book says.  A lot of the setup/measurement values are
_VERY_ 
> sensitive to altitude.

What I am refering to is dynamic FI control.  The motor doesn't care what
altitude you are at, all that altitude effects is atmosperic pressure. 

I will grant you that altitude (atmosperic pressure) is important with
respect to setup values, especially with non-O2 sensor (Lambda) equipped cars
as are the older euro models.  The Lambda control circuitry in US cars takes
care of tuning after initial warm-up, all altitude (atmosperic pressure)
affects is initial cold start conditions.  I guess our US spec cares are
better than the euros in motor control respects.

The altitude compensation circuit in the 3B is there only to prevent turbo
over-spin.  That's what the Audi service training manual says anyway...

Steve