Subject: Re: Suggest me some rear shocks for drag racing. by dan0617 on 2010/2/6 16:11:03
Quote:
BillH wrote: Quote:
dan0617 wrote:
I have never had adjustable, or even good quality, shocks on anything I've ever had. I appreciate any knowledge you care to share!
Dan, a very short primer from a drag racing point of view on the rear shocks:
Bump is when the suspension (A arm) moves up (when the rear squats on launch. Rebound is when the A arms move down ( when the car start moving forward and the rear starts to move up.
So: with an adjustable, you can taylor the rate that the rear squats on launch. Dialing in more bump forcewill make the rear squat slower. Once the rear squats, you want to keep it there, IMO, so the more rebound force you dial in the slower the rear will rise up. As the rear rises, you're taking more weight off the rear so, making it rise up slower with more rebound dialed in will keep weight on the rear for a longer period of time.
Note; most of the above is not applicable for a road course.
I think I see what you are saying now. Once the initial weight starts coming off the rear of the car, if there isn't much rebound force dialed into the shock it will try to lift the rear tires up as the rear of the car lifts up.
So, I'd want little bump dialed in, so the weight of the car would go back quickly (transfer), then lots of rebound so the shocks kept the weight of the car pressing down on the rear tires. Is that right, or would I want lots of bump too??
I see there are single adjustable shocks and dual adjustable shocks. I'm assuming the single adjustable means as you adjust the bump up, the rebound force is lowered, and vice versa?
I also hear people saying they set the front shocks to 90/10 for drag racing, I'm guessing the bump is 90, where you push the front of the car up during launch, and the 10 is rebound. Is that right? Then I have friends that say just go with the softest setting possible on front shocks for drag, the weight of the car does the rest.
