hi,
ive got a problem with my genuine cosworth amal valve. its broken and have no boost control at the moment.
bought a focus rs mk1 3-way amal valve (pierburg) and connect the hoses correct, but have no boost control again.
when i fitted a older genuine cosworth amal valve, all works fine and boost control is perfect.

any ideas why the focus rs mk1 valve dont work or any ideas which aftermarket valve works with the cossi management?

thanks for help!