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so, been thinking and looks like im going to remove the plates and weld up the hole . looked at some 86-91 n/a thb's and they seem to work a bit different . once the thermovalve lets the vac go, the plates stay full open all the time.seems that the 3rd gen is set up the same way . just the turbo IIs seem to have this combination of valve keeping plates closed until warm up on USA models. not sure what their purpose is on jdm motors. driveability maybe? if they are for warm up then I understand but how they help for smooth driveability I have no idea if n/a and 3rd gen stay open once fully warm . I have a stand alone ecu so I can play with the accel enrichment and decay . hmmm
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