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It's just a solenoid that pulses to set the boost at the wastegate. MS has a flaw in the programming and you can't set it as PSI but as a percentage of open/close time. It works fantastic.
More info here: http://www.e30tech.com/forum/showthread.php?t=78727E30 with naturally aspirated but highly modified M20 engine does 0-240km/h on the Haapsalu...
He lists some of the mods..
Short list of engine mods:
2826cc, cr: 10.8:1
Crank: 84mm (M52B28), piston: 84,5mm orig. last oversize
216hp and 280 nm @ wheels
Tatech EMS (no AFM, coilback ignition, WB lambda control, etc)
305cc injectors
535i throttle body
Camshaft: dbilas-dynamic 312° lift 12,5mm + dbilas valve spring kit
PPF rocker arms (good up to 9000rpm)
Adjustable cam gear
Exhaust: free flow 2,5 inch (one tube)
Modified intake manifold and throttle body
Lightened flywheel
Sachs Racing clutch
It's "only" 216 whp, but he goes 0-60 in 5 seconds. Isn't that quick enough for most people? Wish he listed how heavy the car is
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