Driving Solenoid Valve (Re: Electronic Boost Control)

[Fred Miranda]

Well, the one I built runs at 60hz no problem.

At 02:09 AM 4/14/97 -0700, you wrote:

>Way too fast.  I'd say less than 10 Hz would be right.  I've wired an LED in
>parallel with the wastegate frequency valve on my Audi 5000 turbo quattro
>and I'd say the frequency is less than 10 Hz, probably closer to 5Hz.
>This too is PWM, switching the output between manifold pressure (ie boost)
>and just before the turbo (slight vacuum).  If you get too high in frequency,
>the valve is going to float somewhere between closed and open due to its
>inertia.
>
>BTW: it may not like 100% duty cycle either; the Audi computer uses a
>max of E6 out of FF on.
>
>Orin.
>
>
>