pinching off waste gate line on stock turbo
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Keep your drive pressures low so you do not create a restriction on the exhaust side causing unnecessary boost/restriction or blow your head gasket
As I understand it the drive pressure is the pressure that is between the exhaust manifold and the turbo. Those with wastegates closed off or running a turbo with a small non-wastegated housing can have a big restriction if they do not have a wastegate that allows the the extra air to bypass the turbine wheel reducing the pressure and helping to keep the turbo from overspeeding and creating excess boost leading to even higher drive pressure.
for instance the 71mm turbine wheel is called the LDP or low drive pressure wheel and because drive pressure is lower (and slightly more mass of the larger wheel) during normal driving the turbo does not spool as well, but at higher RPM and higher boost it allows the air to flow more freely out of the engine and manifold.
As I understand it the drive pressure is the pressure that is between the exhaust manifold and the turbo. Those with wastegates closed off or running a turbo with a small non-wastegated housing can have a big restriction if they do not have a wastegate that allows the the extra air to bypass the turbine wheel reducing the pressure and helping to keep the turbo from overspeeding and creating excess boost leading to even higher drive pressure.
for instance the 71mm turbine wheel is called the LDP or low drive pressure wheel and because drive pressure is lower (and slightly more mass of the larger wheel) during normal driving the turbo does not spool as well, but at higher RPM and higher boost it allows the air to flow more freely out of the engine and manifold.
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CumminsCoalRoller24/7
5.9 Liter CR Dodge Cummins 03-07
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04-21-2015 09:03 PM