|
|||||||
|
|
|
|||||
|
|
|||||||
|
|||||||
|
|
|
|||||
|
|
|||||||
Porting on the 3.3
The 3.3's intake is very restrictive. After a larger TB, a cone filter, you'd want to do more at some point.
The first solution is to remove and port out the lower intake manifold. This is quick and easy. After porting the lower manifold, you'd need to port the upper manifold and possibly the cylinder heads to get them to match the larger diameter airpaths in the lower intake manifold. Doing this will also require you to modify the gaskets for these parts so it all goes back together right.
In porting the upper intake manifold, you have a few options. You can cone out the bottom of the runners so that the runenrs slowly open up to the larger airpaths of the lower intake manifold, or, if you want to be more extreme, you can open the manifold up (band saw) and JB Weld it back together. Some metal is lost by the cutting blade, but if you use the JB Weld right, it would be more then thick enough to fill in these cut away spots.
With the 3.3 cut open, you can smoothen out the internals, make the entire runners larger- it's all up to you. Reguardless, it would take a while to do this- so I'd get a second manifold so you can do it on your spare and still be able to use your car while you wait to finish up.
Gains would be mostly in the mid rpm range and a tad in the upper rpm's.
Porting the TB neck is a MUST if you're running the 58mm TB. When I did this with my 2000 intake manifold (waiting to go on), I basically used some grinding bits in my electric drill to open up the TB neck. I found that basically the neck OEM had 3 large bumps that went around the neck, which restrict airflow and cut down that 52mm bore to more like 40mm, it took several days to open it up and get it mirror smooth but I basically got it to the point where everything was 58mm and smooth (no ridges, bumps, etc).
Here is a picture of my manifold, ported to 58mm at the TB neck:
