6.4 High Boost / Low Power Issue

[mr8675]

I have a 2008 F-550 That we just installed a new engine. We installed a DPF delete package, EGR block off and SCT Live Wire tuner at the time of engine replacement. When you start up the road at 1/2 throttle, it will make up to 59 psi of boost (regardless of tune). It seems that once the truck gets to 55 mph the boost drops and the truck runs OK. At that point, full throttle we are getting about 41 psi of boost. If you stop and cycle the ignition key, it will go back to high boost. Only item I noticed is the EGR block off plate is installed on the top exhaust flange. I think it should be installed at the cooler on the left side (drivers) of the engine. We have blew (3) CAC hoses.

[greasltn]

Make sure the actuator for the turbo is moving freely, if it binds the boost will do funny things.

[08pwrstrokr6.4]

might wanna put on a waste gate

[mr8675]

I think the EBP sensor is located right before the 1st EGR manifold. If so, the way we installed our block off plates the EBP would sense 0psi. Could this cause the problem?

[08pwrstrokr6.4]

bump bump bump

[greasltn]

I missed that in the first post, yes the plate should be by the cooler. The EP sensor is not reading anything and spooling up the turbo hard. I'm not really a fan of the block off plates, I prefer the EGR delete with wastegate, it helps relieve the drive pressure.

[mr8675]

Relocated the block off plate and that took care of the issue.

thanks

[greasltn]

good to see you up and running.

[reinaldo]

Wow that's good news. I also don't know that the block off plate is the problem in that case. I thought you have to fix the exhaust pipe flanges.