I have completed the flow testing on the 2005 Lower Plenum that is changed and a part of the additional 13 horsepower for 2005 models.
There is still a big difference between the airflow at the front of the intake where it is squeezed down by the upper intake and the back of the intake.
The front flowed 226 CFM @ 28" H2O
The back flowed 247.5 CFM @ 28" H2O
I then removed all the rough casting from the bottom side of the upper plenum and the inside of the lower plenum. I sanded it down from 120 grit to 600 grit. I also did a little port work on the inlet and the front runners (where there is less flow).
The front now flows 248.5 CFM @ 28" H2O
The back now flows 269.5 CFM @ 28" H2O
I have a dyno scheduled for Monday to see how much horsepower I picked up and what happened to the torque.
This is the upper pleunum before polishing.
There is still a big difference between the airflow at the front of the intake where it is squeezed down by the upper intake and the back of the intake.
The front flowed 226 CFM @ 28" H2O
The back flowed 247.5 CFM @ 28" H2O
I then removed all the rough casting from the bottom side of the upper plenum and the inside of the lower plenum. I sanded it down from 120 grit to 600 grit. I also did a little port work on the inlet and the front runners (where there is less flow).
The front now flows 248.5 CFM @ 28" H2O
The back now flows 269.5 CFM @ 28" H2O
I have a dyno scheduled for Monday to see how much horsepower I picked up and what happened to the torque.
This is the upper pleunum before polishing.
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