boost guage and zener diode questions...

[tmb]

> Which vehicle are we referring to?

1989 audi 200TQA with a dual KS setup and the
MAC-14 ECU.

> Why do a Z/R mod when the chips are offered at
> reasonable price.

cuz it can't possibly be more reasonable than <$5
worth of resistors.  please insert correction
here if i'm wrong.

> The Z/R mod will definitely skew the digital
> boost readout and not reflect actual pressure. 

> Resistor will skew the
> readout to display less than actual.

that's alright.  with the new fancy schmancy
guage installed, i'll be staring at that instead
of the original unit.

> Zener will clamp the output of the PT so the
> readout will max out to a
> particular value regardless of peak.

i can deal with that assuming that the WG spring
is the right rate.  i friend of mine ran an
indicated 2.2BAR on his 5000TQ for 250Kkm with no
issues.  that kind of experience is enough to
convince me.

> Also  the digital readout is not necessarily
> accurate even in an un-modded
> setup.  Each .1 bar is about 3 PSI and the
> readout can lag as boost changes.
> It is for a ballpark measure only.

ah.  good to know.  

thanks to everyone so far for their info.

jason
tmb

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