Ported my first LFX intake manifold today (but not my first time around the block porting), and I am extremely happy with the flow gains... There wasn't a lot to work with being as the LFX manifold is made of a composite material, and doesn't have too many problem areas (that we can see, since it doesn't come apart (yet))...
The bottom of the lower intake portion was gasket matched to the intake gasket, the top of the lower intake portion was matched to the bottom of the intake. I also blended out a decent sized ridge in the bottom of the upper intake manifold...
Not much of a gain was had from the work above, but none the less, a gain is a gain (~2%)
The biggest gain was had with the "reservoir" behind the throttle body was filled and blended into the intake. This is by far the LFX intake manifolds biggest fault, not only is the "reservoir" about 3" deep which most likely causes a swirling effect right behind the throttle body, in which there seems to be a piece built in to redirect air and straighten it back out...
The "reservoir" area was roughed up, filled with a polyurethane plastic, and secured using bolts so it should not come as the plastic is formed around the bolt threads. I then went to work smoothing and blending the filled void into the intake runners, and removed half of the "air straightener" piece at the top of the throttle body opening... I could have removed the whole thing, but my thinking is that you can easily loose as much as you just gained by going too far, and after all this work, the end result was about a 9.5% gain in airflow as shown on our in house Super Flow flow bench...
I have dyno time scheduled for Aug 3rd, so this ported intake will be added to the list of things to try along with: The LFX Intake Extendolator (Intake spacer/isloator), The Adaptolator (w/ an LLT intake manifold on the LFX engine), The stock LFX intake with no spacers, and finally the ported LFX intake...
The bottom of the lower intake portion was gasket matched to the intake gasket, the top of the lower intake portion was matched to the bottom of the intake. I also blended out a decent sized ridge in the bottom of the upper intake manifold...
Not much of a gain was had from the work above, but none the less, a gain is a gain (~2%)
The biggest gain was had with the "reservoir" behind the throttle body was filled and blended into the intake. This is by far the LFX intake manifolds biggest fault, not only is the "reservoir" about 3" deep which most likely causes a swirling effect right behind the throttle body, in which there seems to be a piece built in to redirect air and straighten it back out...
The "reservoir" area was roughed up, filled with a polyurethane plastic, and secured using bolts so it should not come as the plastic is formed around the bolt threads. I then went to work smoothing and blending the filled void into the intake runners, and removed half of the "air straightener" piece at the top of the throttle body opening... I could have removed the whole thing, but my thinking is that you can easily loose as much as you just gained by going too far, and after all this work, the end result was about a 9.5% gain in airflow as shown on our in house Super Flow flow bench...
I have dyno time scheduled for Aug 3rd, so this ported intake will be added to the list of things to try along with: The LFX Intake Extendolator (Intake spacer/isloator), The Adaptolator (w/ an LLT intake manifold on the LFX engine), The stock LFX intake with no spacers, and finally the ported LFX intake...