Spring rates for drag race

[contraption22]

Thinking about going with coil-overs for the front of my Horizon for better tire clearance.

Currently I have coil-overs in the rear with 450Lb springs. This pretty much eliminated rear-end squat. The front is stock 110k mile Horizon springs and KYB struts.

My question is regarding spring rates in the front. I currently have two ideas.

1. Keep the spring rate soft in the front, so that the front end has less of a tendency to rise.

2. Use stiff springs in the front. That way, with the spring at full extension, the strut will keep the front end from rising.

What do you think is the best idea and why?

Thanks in advance.

Mike.

[BadAssPerformance]

Good question.

I always thought the stiffer the better all around so that there is less body movement which is just wasted HP.

With that said tho, I have seen some crazy stuff, like a 5.0L mustang with a 4-banger mustang coil on the right rear only so that it squatted (crooked) and hooked on the street, LOL...

[contraption22]

Well I called Ground Control. Their tech guy said the ideal setup would be soft spring up front with a strut with stiff rebound. Opposite for the rear. This would minimize weight transfer to the rear. I guess that would explain why my current setup works decently with the occasional 1.6X 60 ft time.

[Speedeuphoria]

I know its hard to believe, but some good info w/ links posted on srtforums
http://www.srtforums.com/forums/showthread.php?t=333344

[BadFastGTC]

What did he mean by "soft"? I was going to recommend a 200 or 250# spring. I've tried a high rate on my front end and promptly took them off. I do adjust the rebound control a little stiffer up front and in back I adjust it a little stiffer on one side. I also find the car to work better with the rear on the soft side. Personally, I feel a stiff rear (moreso with a stck car), will cause the front to lift more and reduce traction.

Steve M.

Well I called Ground Control. Their tech guy said the ideal setup would be soft spring up front with a strut with stiff rebound. Opposite for the rear. This would minimize weight transfer to the rear. I guess that would explain why my current setup works decently with the occasional 1.6X 60 ft time.

[contraption22]

I would assume he meant soft as possible. I'm thinking of keeping it as close to the current spring rate that I have... maybe 160-180lbs or so. I don't want it to dive so hard under braking that I cut a on the sheetmetal.

What did he mean by "soft"? I was going to recommend a 200 or 250# spring. I've tried a high rate on my front end and promptly took them off. I do adjust the rebound control a little stiffer up front and in back I adjust it a little stiffer on one side. I also find the car to work better with the rear on the soft side. Personally, I feel a stiff rear (moreso with a stck car), will cause the front to lift more and reduce traction.

Steve M.

[turbo2point2]

Mike, I am using 250# on the front of the Shadow and 400# on the rear. I thought the same when choosing front coils, I didn't want to cut into the tires on decel/braking.