<BLOCKQUOTE>quote:</font><HR>Originally posted by DannySS:
There's a lot of info on this forum about 1/4 mile and acceleration and what to modify for a better start of the line..., but how about some info and mods to do (engine, suspension, brakes, etc) for top speed runs. Running at high speed on the highway is what I like. Blowing by a Porsche is a lot more fun than running from light to light.
Anybody have suggestions?
Anything on the Aerodynimics of the Impala at high speeds, best suspension set-up, best mods to the steering system?
1. Engine: gonna have to build the guts to withstand several minutes at WOT. That means forged crank, and $$ rods, pistons etc. Better oiling should be done, incl oil spray to the underside of the pistons to remove heat. I guess you could say that the motor needs to be built as if it were going to run a NASCAR event: WOT for a long time period.
2. Suspension. Remove the 12.7:1 fast ratio box and get one from a granny Buick. Fast ratio boxes are NOT what you want on a very high speed car. The car should be lowered to keep air from getting under the car. The tires need to be rated the same as the best Ferrari and Lamborghini. I think W is the one (168+ mph).
3. Aerodynamics. An undercar tray/trays of smooth sheetmetal should be added to smooth the air flow under the car. The car's body appears like a wing shape from the side and that means lift as speed increases. So the lift needs to be countered so that the car pushes at least a little on both front and rear as the speeds get very high. This is very serious stuff; a car that loses ground force and gets too much lift will become airborne and then the car will begin to fly, the roll, and then land on the roof. This has happened at LeMans in real racing cars, so don't think it can't happen to a very high speed Bcar. There is a lot to tweaking the body (top side and underside) to mitigate this, and I know enough to know that I'd need to learn more about it. The body appendages would also want to be shaved and smoothed (mirrors, door handles) and the front air dam would need to be VERY reinforced.
4. Brakes. The biggest that could be installed, and that probably means either Porsche type, or actual NASCAR rotors, with double calipers on the front brakes. Cold air ducts would need to be added to feed the hubs.
5. Roll cage, door reinforcements, real racing seat with real racing harness, and on board driver-fired extinguishing system.
There's a lot more that could be added, and basically if you look at what gets done to a 3400 lbs NASCAR vehicle for a high speed track like Daytona, you'd want to duplicate most of it.
The cost to do many of these mods goes directly as the increase in speed. - Ken