Turbo Bypass Valve Issues

Jobe Tichy bimmer_dude at hotmail.com
Wed Apr 17 23:27:54 EDT 2002

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Ever since I have owned my 20v, I have noticed a "sputtering"-like sound when
I would shift through the lower gears--kind of cool sounding.  But, I have
also had this corresponding 1.6 max boost issue.  I have read up a bit about
the turbo bypass valve being the cause of this sputtering sound because it could
the diaphram inside rattling.  I have heard there is also a corresponding
"groaning" sound with bypass valve problems but I do not have this.  Is this
normal?  Would this be a cause of a leak to where max boost was unable to be
attained if the diaphram was rattling?  I guess MTM makes a bypass valve that
is a bit stronger, probably to be used with their high boost chips.  Has
anyone had any experience with the MTM valve?  Thanks in advance....


'91 200tq 20v

'84 BMW 318i (modified)

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