Why is my GMC Turbo downpipe clamp leaking?
GM’s first bulletin was to service as above. Later there was a redesign change downpipe and pipe joint. Yours is new enough to have the newer downpipe and clamp — but it could still be loose/misaligned. You might try loosening, realigning and reclamping before replacing the injector.
How many horsepower does a GM Duramax have?
GM was eager to develop and speed to market the 6.6-liter LB7 Duramax, which produced 235 horsepower. Later versions including the LLY, LBZ, LMM and LML would use more sophisticated turbos and engine controls, ultimately increasing both horsepower and torque by about 80 percent from 2001 to 2011.
How to tell if your Duramax Diesel Turbo is gone?
If you can’t find the appropriate fitting, check boost at one of the vacuum ports. With the gauge connected, open the throttle and check the peak boost. All models should check in at 20 psi of boost maximum, with the rpm at about 1,800 for 2003 to 2004 LB7 motors and 1,600 for all others.
How does a variable geometry turbo work on a Duramax?
Instead of a wastegate, variable-geometry turbos use variable-pitch vanes to modulate turbo boost. The vanes are close together at low rpm, increasing exhaust gas velocity and helping the turbo to spool up faster. An actuator pushes the vanes open at high rpm for maximum flow.
GM’s first bulletin was to service as above. Later there was a redesign change downpipe and pipe joint. Yours is new enough to have the newer downpipe and clamp — but it could still be loose/misaligned. You might try loosening, realigning and reclamping before replacing the injector.
GM was eager to develop and speed to market the 6.6-liter LB7 Duramax, which produced 235 horsepower. Later versions including the LLY, LBZ, LMM and LML would use more sophisticated turbos and engine controls, ultimately increasing both horsepower and torque by about 80 percent from 2001 to 2011.
If you can’t find the appropriate fitting, check boost at one of the vacuum ports. With the gauge connected, open the throttle and check the peak boost. All models should check in at 20 psi of boost maximum, with the rpm at about 1,800 for 2003 to 2004 LB7 motors and 1,600 for all others.
What kind of compression ratio does a Duramax have?
Thanks to a 17.5:1 compression ratio (the highest of any other engines in the Duramax lineage), extreme amounts of low-rpm cylinder pressure (i.e. torque) can be present when you’ve more than doubled the factory horsepower and torque rating.