Just a note about throttle body choice. Even with a progressive linkage, the throttle is VERY touchy (especially on a well-tuned car). I can't imagine even trying to drive a car without a progressive throttle body. Probably okay for racing, but trying to delicately pull away from a stoplight could be a major chore. -Bob C.
I've heard of this concern before. But the thing I don't understand is that if it's going to be so touchy how can a ford 460in^3 V8 use it in production format and not have a problem?
No problem what so ever with the progressiveness of my q-jet throttle body. The map sensor automaticly compensates for the extra air. It doesent matter how hard or soft I "matt" it. The secondaries are not opening unitll about 85-90 kpa, so I just richen that part of the fuel map to compensate at a particular rpm, at the touch of a button. I also have a Ford 5.8l twin throttle body, but after looking at it enough, and looking at a TPI throttle body, I decided to keep my car as much "GM" as possible. Even though the Regal DOES have a 9" rearend, LOL Supernova455
Oh, ok, the dual TPI throttle body...I know what you're talking about now. I was talking about the ford one. But I still don't see what makes it different from a big block ford to a big block buick as to why the factory puts this TB on the ford and why it would be a drivability problem on a buick using a speed density/MAP EFI setup. I have dual throttle body from a LT1(5.7L V8) on my 3.4L V6 in my camaro and it doesn't cause a drivability problem. Although that may just be because this tiny engine doesn't dump power to the wheels when the throttle is opened like a BBB would... :3gears:
Maybe it will work. But those big trucks can weigh about a ton more than our buicks, which can take a lot of the "lurch" out of the thottle response. But I can say for sure that the first small amount of air really increases the output of the engine, which can make it difficult to drive "gently". I have been trying to find some sort of continually-progressive linkages (i.e. a non-concentric / cam-shaped throttle linkage), so the first part of the pedal movement makes the throttle blades open very slowly, and the lower part of the pedal movement would snap all of the throttle blades wide-open. So far, no luck. -Bob C.
