Re: Its all good; now I need to ask for some assistance
Please remember that the boose is short lived and that it has benefit ONLY IN AUTOCROSSING. No where else do you have full boost,get fully off the throttle and immediatly FULL throttle again and again and again in rapid succession. It was an assist but the wow factor to the track lizards was priceless.
Ill open up a bit more data here since you seemed interested. The engine idled on bypass air thru 3 pcv check valves( fuel injected engines are air contolled, more air =higher speed as the computer tries to keep the fuel/air mix reasonable). Air was drawn in at idle in and they were shut under boost. I added a brass swing gate check valve between the turbo outlet and the throttle body inlet. When the throttle was closed NO air went into the engine through the throtle body (it was reworked to shut fully but not bind). This allowed the boost to be trapped in the tank that was connected between the closed throttle and the check valve. The blow off valve and turbo of course were before the check valve so the turbo loved it. Less to blow off. The black thing in the trunk is a check valve 1 1/2" [sump pump part] with very little loading/tension on the valve so the motor could suck thru it when the pressure in the tank was used up and the turbo had not achieved full spool up [boost]. I called it a GULP valve cause it sounded like that and it added more air to the engine prior to boost onset.
Anyway it worked a bit but the crossfire was the result of trying to plow a 4 cyclinder ( supposed to be at least 330 hp super 60 series motor) thru turns with a standard getrag gear box and some turbo lag. I got whooped almost every run for a year and decided to draw a better sword to do battle with. If I can locate the photos Ill show the intake and mods for your amusement.
Again in defense of the photos for the purity / sanity police; this was a test bed that I played with and it was track only. Yes the bungey cord holds the dip stick in as at 7500 rpm I had enough blowby and windage to poof the dip stick up and drip oil - a no no. Could not afford the time to shift, so I used 1st gear and revs to make the straight sections of the course exciting. Was a $600 car purchase that kept me passivated for a year or so; Engineers!
Enjoy every day, they are special.........that is why today is called "the present".
Woody
Last edited by waldig; Apr 15, 2008 at 11:48 AM.