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Turbos help the fuel economy on diesels.
They do have a bypass for the exhaust, its called a waste gate.
The intake also has a bypass valve, called a blow off valve, its operated by intake vacuum, anything less than about 5''Hg and the blow off valve is open.
Diesels do not require blow off valves.
I intend to use a BOV on my diesel to allow air to by pass the compressor at low speed before the turbo lights off, I measured measured 1''Hg in the intake piping so far, driving it kind of easy.
Other wise turbos help diesels about 90% of the time. You wouldnt want to deactivate it.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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