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Author Topic:   Metric Front Suspension / Springs
Dirt Forum Racer

Total posts: 82
posted July 31, 2005 03:13 PM  
Ran 100 lap enduro Friday night and kept the car in one piece - finished 10th. The comment from the pit crew was that the car looks like it's nose diving like crazy on the right front - as the track went from tacky to dry and got a little rough I could feel the front end bottom out every now and then - you can see on the right exhaust manifold that the upper control arm has touched it a few times that night. Here is the setup I ran: Springs: LF 1000, RF 1150, Rears are stock (I think about 160lb/in each). Corner Weights on the car were: LF 1005, RF 904, LR 770, RR 766 for a grand total of 3445 with 51.5% left side, 44.5% rear, and 48.6% cross. I did not have a sway bar on it front or rear. The front shocks were some aftermarket factory mount style ones and the rears were stock. The car seemed to handle really good - on occasion it would get lose, but I could always steer out of it. I didn't have any stagger in the front wheels - a little stagger in the back. The track is 1/2 mile around the inside, 5/8 around the outside - clay, with pretty good banking in the corners. I had -2.5 degree of LF camber and -3.5 degree of RF camber. It seems like the simple plan would be to run a heavier right front spring - is this the logical approach or am I missing something? My front setup seemed to be a decent baseline from what I read on the web, but I wonder if my corner entry speeds are a lot higher due to the track being so much bigger and this is throwing things off? Any help you could give would be appreciated. Thanks, Jim

sc1 racing
Dirt Freak

Total posts: 419
posted July 31, 2005 07:53 PM  
id go up to a 1200 on right front, but would also get new springs for the rear, or at least pull them out to check what they are.

Dirt Forum Racer

Total posts: 82
posted July 31, 2005 09:14 PM  
I had the rears out, but don't have a compression checker so I don't have a very scientific method of testing. My method of determining 160 lbs/in was to stand on one and it compressed 1.25 in - I weigh 200lbs so that was how I got the 160lb/in rate. I was thinking 250 and 225 across the rear?

Dirt Forum Champ
Total posts: 5390
posted July 31, 2005 11:01 PM  
thats sounds good for the rears up front i agree with sc1 1200 or even 1300 rf would help alot on a realy rough track good shocks might help as well. i'm going to run enduro's next year and i'm going to go up on my fronts from 1150/925 to 1200/1000 but my car will only weight about 2800

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