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Author Topic:   Y heavy front springs??
wtbrlr3
Dirt Roller

Total posts: 6
posted July 29, 2005 03:25 AM  
I run impala stub with 600 lbs across the front. Three link with a 200 lr in front of the axel. 150 in the rr behind. 56% left 55 rear 50% cross. I run 200 lbs of bite. I have ride hights of 6"ish. I bottom out almost never. It has to get really really rough for me to bottom out. Why is almost everyone I talk to running 150 to 200 lbs more front spring then me? I talked to two guys I race against, both have the same stub they both have heavy springs. I tried them once It felt like the front never even moved a inch. What am I missing?

rpm20
Dirt Freak

Total posts: 338
posted July 29, 2005 04:04 AM  
give your car what it nedds for your driving style and let the others do what they will.
i run a dw8 with a chevelle stub and the dw recommended springs are 650-750
i only run 550 -650 and never bottom out either. thats what works for me.

chickenlittle
Dirt Full Roller

Total posts: 63
posted July 29, 2005 08:03 AM  
I run a chevelle front end too. I use a 550 and 500 and have no problem unless the track is real rough. Car handles great with this set up.

Kromulous
Dirt Forum Champ
Total posts: 796
posted July 29, 2005 08:06 AM  
The front and rear roll centers work together, i believe anyway. They way i understand it anyway maybe Wfoondirt can clarify this, he seems to have a good understanding of all this.

If the front is high, and the rear is to low, you'll need heavier springs and the opposite. One will compensate for the other, in other words. I believe you should desire a balance.

Go ask them guys what kind of panhard bar they run, and how its mounted etc. I bet you'll find the difference there.

madnik18
Dirt Full Roller

Total posts: 40
posted July 29, 2005 10:25 AM  
maybe i should not be responding to this since i just asked what is rake on a nother topic lol... but i just helped a friend set up the front roll center in his car... if your roll center is to the right of the centerline of the car then you would need softer spring to get the same roll efect...
depending on the track it needs to be to the left.. and like the other guy said it need to match the rear... my buddy went from the middle to the front after changing this...

chickenlittle
Dirt Full Roller

Total posts: 63
posted July 29, 2005 01:44 PM  
You pretty much want the wheel travel to be equal in the RF and RR. It is best to have the same amount of roll angle in the front and rear suspension systems. You control this by changing weight distribution and spring rates. You need to figure out what kind of dynamic loading you are getting during a race. A lot will have to do with the track conditions as G-force plays into how much weight will be transfered dynamically. One thing you can do is set your shock bumper rings before going out and check how much they compressed after the race. Bumps will come into play though.

madnik18
Dirt Full Roller

Total posts: 40
posted July 29, 2005 02:55 PM  
hey chickenlittle do you use a software program to find your roll angle? or is there a way to do it with out the costly software?
thanks

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