November 16, 2009

Before the 2009 Silver State ORR I wanted to update the intake for the
Vortech supercharger. I drew up a simple diagram for a new air box and
asked Tim Murphy if he could build one of these. Here is version 3 of the
drawing:



After he and Todd checked it out and brainstormed for a while, they agreed
to build one for me. In the mean time I tried to find an air filter that would
work. My original drawings had a round air filter, but it was too small and
didn't provide enough surface area. So I went with an oval filter with a
"open" top. I found one at Summit Racing that would fit. Here is a photo
of the finished air box and air filter on a sheet of insulation:



I then made a card board pattern for the filter shroud, here is the base:



Then added the walls:



And finally the whole system:



Next it was on to the aluminum version. I got some sheet metal, outlined
the template and cut it out. I then pop riveted the sides into position:



I then lined the back side with the insulation and mounted the air filter. I
also modified the air dam (top of the radiator) that came with Tim's supercharger
kit. Here's the finished product along with a new C&R radiator from 928 International:



Oh, and I did move the hose from on top of the radiator to the front edge to
allow better air flow.

Update 11/29/2011

It's been a year with the new airbox. I was still measuring some high temps in the airbox
because of the gap between the radiator and the intake scoop.



So I added a divider, this drop the intake air temps by 20 degrees!



Another issue I found was at the dyno I was only able to get 12.5 psi of boost with this set up. I put a
vacuum gauge on the airbox and saw 3.5-5" of vacuum.



(The sensor on the right is an air temp sensor.)

Anyway, I added a 2" intake to the box and a hose around the radiator with a K&N filter:



I hope this will be me back to 15 psi boost. I'll find out at the next dyno session.