Well tonight I decided to port the fast. Here's what I did. First I took the fast apart so that the 2 base pieces were still bolted together. I bolted the 2 lower pieces to the cylinder heads and after they were in place I started porting. First I smoothed about 1/2" up and matched the runner to the opening of the cylinder head. Once all 8 runners were matched up on all sides, I used a sanding roll to blend the "port matched" portion up into the runner 2-3 inches. It was starting to get thin in parts but I don't think that they are too thin. What else should I do? Should I bolt the top piece on and smooth everything together? It looks alot better now.
Phil

 

I would just re-assemble it and smooth everything together. That's probably as good as you are going to get without being an expert on flow charecteristics and what not.

 

When I ported mine, the upper portion of the manifold didn't require much of any matching. I did the exact same thing you did. I finished mine off with a fine grit sand paper for a smoother finish. Just make sure everything blends together nicely. On the portions of the runners were you can get your finger behind were you are porting, feel for heat. When it starts to get warm, you want to stop.

 

Lets see some pics of the master piece

 

Were you just using sand paper for the first part?

 

No, carbide burr.
Phil

 

TEA port matched mine for $80. They also smoothed out the lip in the TB hole. Car feels alot stronger now with the 90/90. I hope to get all down in the 10s real soon.

 

Cartek porte mathed mine for $250

 

WOW I hear you can get your FAST 90mm "mamofied" for $500.

 

A carbide bit is a little overkill for that material. I used a sandpaper roll and removed the ridge from each port and smoothed up all of the transitions where the seperate intake pieces come together. Spent about 1.5 hours to finish.

 

I think if you are very careful and run low RPMs the carbide cuts the grinding time, then you can finish off with a sanding rolls. You using a single of double cut carbide?

 

When you bolt the intake down and use a very soft touch with the carbide burr you can match the ports quick and easy. Once the lip is where you need to be take sanding rolls to transition them. Can anyone take a pic down the intake runner of a FAST 90 with good lighting? I can take a pic of one that I ported.
Phil