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Hi
Paul & John (and anybody else that cares :-);
Attached is a drawing of my wastegate control. The idea is
that when switch is open, the solenoid remains closed and the actuator sees all
of the boost pressure, limiting the boost to ~6psi. This is more than adequate
at low elevations, but at high elevation I'll want more to provide normalizing.
Closing this switch will open the solenoid, allowing boost pressure to reach the
bleed valve in the cockpit. Bleeding off the boost pressure here will allow me
to reach higher levels of boost. This bleed valve is just a cheap panel mounted
needle valve. Due to the length of the plumbing to the cockpit, in order for
this to work properly a restrictor orifice was necessary. For the orifice, I
merely used a simple 1/4"brass tube tee and packed one leg of it with Devcon
weld (same as JB weld). After it cured I drilled a .050 hole through it.
The solenoid and check valve were just taken from all the pollution
control crap that was on my junkyard engine.
Rusty's most excellent description, pretty much sums
up the rest of it. 2 books that are worth reading on the subject are;
- Turbochargers by Hugh McGinnes. This is a good
book and is considered by many to be "the book", however I found that much of
the information in it was somewhat dated. Still worth
reading.
- Maximum Boost by Corky Bell. I
found this book to be much more comprehensive and as it is a recent
publication, much more up to date with modern developments. It also has a
section in the back that lists all know turbocharger manufactures and dealers
for parts and accessories.
Hope
this helps
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