Originally Posted by bill dedman
I have no dog in any of these hunts, and won't, but I have some experience as regards supercharging and its effect on performance that might be of some interest.
I ran my car, a daily-driver, sometimes hobby-class drag strip, bracket car ('72 Valiant/360) with a very mild, normally-aspirated combination (475rpm idle) and ran 13.35 @ 102 mph with a 750cfm carb.
I decided that wasn't very exciting, so I made a change...
All I did to improve performance was to replace the 340 exhaust manifolds with headers, install an air gap-style intake manifold and a Vortech V-1, S-Trim (entry level, the smallest blower Vortech makes, I think).
The first time out for this new forced induction combination (yesterday,) the car ran 1,000-foot times of 9.74 @ 106 mph. That, according to the online computers I use, equates to a high 11-second quarter-mile e.t. (should be better, but it was very cold and there was no traction; 1.81-sec. 60-foots) with a quarter-mile speed extrapolated from the 106@ 1,000-feet, to 120, for the quarter-mile.
I am not claiming that these figures are etched in stone, but they were the most accurate 1,000-foot to quarter-mile conversions I could find.
This was with a measly 10 pounds of boost, and no intercooler.
So, basically, my car picked up virtually a second-and-a-half and 18 mph with this smallish blower, added by a shadetree, backyard mechanic (me) with no diagnostic equipment and truthfully, I haven't even set the timing with a light... just listened to it and adjusted the initial timing "by ear."
What I'm saying is, add a blower to an engine and you have access to a whole new world of power...
That's all.
The rules need to address this.
|