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Discussion Starter · #1 ·
Well after forking out £35 for a new APC valve, I decided to examine the old one...

It has 1 moving part, a steel disk, 2 coils and is mirrored from end to end (hence the boost and inlet being top and bottom with wastegate in the middle.

The coils can be individually energised and will pull the steel disk to cover the hole through the centre of the coil, which will then allow the other coils hole to be vented to the centre barrels slots (and the to the wastegate pipe).

Clever design.








Andrew

PS, the black gunge and blocked holes indicate the the coil had got hot and melted it varnish on the copper coils....
 
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