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In this post last week I tested a modification to the air injection line for the Downing/Atlanta kit which increased boost using a simple check valve. I received my parts kit from R-Speed today and just installed it tonight.
The install is a 5 or 10 minute affair. Disconnect the air injection hose from the intake bellows side. The bellows is what runs between the HFM and the throttle body. If you want you can disconnect the hose at the fuel injector side and remove it entirely from the car to make this mod but it isn't needed. On the fuel injector side BE CAREFULL with the plastic tree leading to each injector. It breaks very easily... trust me on this.
Postion the check valve as shown below in relation to the intake side
of the 3/4" hose.
You then need to cut the hose basically at both ends of the check valves body so you can insert the valve in the middle. Make sure you install the valve so air flows toward the fuel injectors. Try blowing through the valve if you do not know which way to install it.
Be sure to use the hose clamps at both sides of the check valve to prevent any leaks.
Now just re-install the hose hose back in the car. I positioned the valve and clamps as shown below to avoid any wire chaffing problems down the line.
The valve ends up being mounted very close to the bellows and is down out of the way.
Since you will be pushing a little more boost after this mod (I saw about 3/4 PSI increase) make sure you are running the highest octane gas you can find. I just got back from a test run with Ultra 94 and NOS Street Formula Octane boost and this car is getting scary fast!
Shawn
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