The wastegate actuator operates at 4psi, so that takes care of the boost at low revs. There is an electronic control unit which at higher revs modulates a solenoid valve to bleed some of the pressure from the line feeding the wastegate actuator. At 6000rpm the line to the wastgate actuator has 3psi bled off to atmosphere, so the actuator itself still sees 4psi but the boost in the plenum chamber is now 7psi.

hmm this post is going nicely. the guy who started it was really going sumwhere lol. im about to start the same engine build up as him, metro motor and T25 turbo etc. so pleez keep ur progress posted, lots of pics and info
cheers

any updates? keen to hear about some progress and see some pikkies

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I'm interested in a project like this. I wouldn't do it to my cooper S motor but to another 1275 or my 1100S motor. What kind of head modifications are required (I read that with any decent amount of boost about 7psi would required the head to be machined for lower compression) and what would this cost, not including the cost of the engine and gearbox itself. Would it be easeri (and cheaper) to import a metro turbo engine and go from there or do it all yourself?

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

have a talk to andrew up at northern mini parts the web site is www.miniparts.com.au hes had a already recondition metro 1300cc sitting on the work shop floor for years it comes with all plates etc for the firewall modification i think hes asking something like $8700 personally id just buy another mini and get ur mate to drive next to ya down the freeway even if someone can go faster side by side they wont be lol ok stupid idea

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Enjoy Chris