Steve's Toyota Supra Turbo
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A Ball and Spring Manual Boost Controller

   
the components of the mbc                                         the completed MBC

To Construct

bulletThe instructions that I followed (I made some slight changes to the parts to better fit a Supra and listed them below)
bulletMcMaster-Carr is a good source for the parts
bullet48935K25 - brass pressure relief valve
bullet5346K42 - brass hose nipple for 1/4" hose (instead of 5346K51 for 3/16" hose)
bullet44555K116 - 1/4" to .170" brass reducing coupler (to couple to the Supra hoses)
bullet44555K142 - 90 deg elbow with .170" hose id
bulletOptional - Dawes Devices sells a dual stage solenoid which one could use to toggle between two controllers allowing two different boost levels (or could be used to toggle between the wastegate and mbc levels)

Results

bulletfantastically quick spool
bulletholds perfectly with very slight overshoot

last modified on Saturday, January 19, 2008

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