Reply to "Turbo Owners"

Blaine, the progress throttle is very easy to make. It can be done in one of two ways. The first way is how I did it. You use a right angle linkage. The cable pulls a near flat lever. The cable side pulls just like a carb, across center. The other side of the lever has a solid rod to the throttle body. But it does not connect at the correct angle. It starts almost flat instead of the typical 45 degrees. Then as you press the throttle it progresses up to about 100 degrees. This way as you press the throttle it actuates the carb very little and when it is opened up it moves faster. Makes off idle much easier. The other way is to use a loose cable and wrap a milled ecentric attatched to the throttle body. This is the way it was done on the GM Tuned port cars. You can change the rate of the ecentric to change your progression rate. It is easy to do by just drilling a hole in a pulley off center and mount it to the throttle body.

Your cam sounds pretty big for the street. Is it a turbo cam or a standard grind? This might be part of your problem with the sudden boost. I smaller cam with less duration might help. It also shows a longer exhaust than intake which is a blower cam. Turbo cams have a longer intake and close the exhaust quickly. This prevents the turbo back pressure from blowing back in the intake valve when it opens. This also makes for earlier boost. My cam only has about 15 degrees of overlap. I suspect you have about 80 deg. If you want a custom grind roller cam, I have one I had made by crower I am not using. I am not sure where the cam card is but it is like 246 intake and 238 exhaust at 050 and only 268 or so at 005. Overlap is like 30 deg. It has a very agressive lift and lifts to over .600. It was custom speced by Danny Crower simiar to one of their salt flat cars. When I ran it it worked very well, but I didnt like the idea of changing the brass dizzie gear. For you this is not a problem. You are welcome to try it if you like.

Dont spend your money on Sequential injection. It does very little for a performance car. The semi-sequential is just fine. Sequential is used for low throttle emissions not WOT power. Trust me on this one. When you get up to 6000 rpm, the injectors are open about 90% of the time anyway so you are injecting on the intake, compression, power and exhaust stroke.