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Author Topic:   front spring change and rearend question
Scoot
Dirt Forum Champ
Total posts: 517
posted May 23, 2004 08:59 PM  
I just swapped my front springs around, and curious to hear what I should expect out of it now. I went from a 1000 lf and 1200 rf to a 1100 lf and 1000 rf. I'm real tight in, pretty good off with what I had. Just trying to shake things up and find a good combo. BTW I run a 225 lr 200 rr. Also I had my left rear axle come out on me friday night. I was told I should spot weld to help keep it in, I'm assuming I should spot weld the race that but*ts up to the bearing?

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Scoot
Smith Racing Team
870-365-5989

racer038
Dirt Maniac

Total posts: 111
posted May 24, 2004 02:45 AM  
We used to spot weld the retainer to the axle. But whenever we broke an axle, it would break right at the retainer. We think that the heat from spot welds were weakening the axle. Local parts house ordered us extra retainers and after we'd press on the bearing / 1st retainer, we press on a 2nd retainer. We think it helped with the axles breaking after a shot. If you do decide to weld the retainer, keep the heat/duration to a minimum so not to make the axle brittle. My 2 cents.

sledgehammer
Dirt Forum Racer

Total posts: 94
posted May 24, 2004 06:36 PM  
Just went from a rf1250 and lf1050 to 1000 on both. I was tight getting in and good off before the change. After the change the car was perfect getting in. Really loosened up nicely on entry.

crew42tx
Dirt Full Roller

Total posts: 53
posted May 25, 2004 01:58 PM  
What did it do to your corner exit? I heard that when you run your springs like that you can run alot more cross weight, like 54%, is that correct?

THANKS for any info

zeroracing
Dirt Forum Champ
Total posts: 1875
posted May 25, 2004 02:38 PM  
by swapping the front spring and going stiffer on the lf then the rf it will tighten entry. we do it on our mod sometimes, and sometimes it will get were the car will not even turn.

Scoot
Dirt Forum Champ
Total posts: 517
posted May 25, 2004 04:12 PM  
I was under the impression it would loosen entry if the lf was stiffer. The more cross you have the tighter it will be right? So by putting a weaker spring on the right front it would reduce crossweight?

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Scoot
Smith Racing Team
870-365-5989

zeroracing
Dirt Forum Champ
Total posts: 1875
posted May 25, 2004 10:10 PM  
quote:
Originally posted by Scoot:
I was under the impression it would loosen entry if the lf was stiffer. The more cross you have the tighter it will be right? So by putting a weaker spring on the right front it would reduce crossweight?


well actually the more cross, or wedge if you will a car has the looser the entry and tighter the exit.
cross is mainly felt at the rear tires, that is why many mods and latemodels go off of lr bite not cross% your feeling the lr bite in the drivers seat.
since it is mainly felt at the rear wheels, when you have a high wedge car, lots of lr bite. then the lr will be loaded more than the rr. so on entry as you get on the brakes, if the lr is out stopping the rr how will the car react? a good example is to use a box on the floor. push your box across the floor now begin to add brake(pull back on one side) to the lr of the box. it will turn left, hince the loose entry with high wedge(cross). now on exit you pick up the gas and the lr is loaded more so now take your box and push it only on the lr corner, the box will turn to the right some as it goes forward. so wedge makes you tighter on exit.
so overall crossweight, wedge, lrbite, whatever you call it makes the car react the same, the more you have the more the lr is loaded so the looser the entry on the brakes and the tighter the exit on the gas.
good luck
jason


[This message has been edited by zeroracing (edited May 25, 2004).]

[This message has been edited by zeroracing (edited May 25, 2004).]

maniac motors
Dirt Maniac

Total posts: 128
posted May 31, 2004 01:00 PM  
scoot,
try going back to the 1000lf and 1200rf.leave rear springs where they are. also list camber and caster settings and tire stagger frt and rear and we'll see if we cant get you on track or should i say around it

Scoot
Dirt Forum Champ
Total posts: 517
posted May 31, 2004 09:50 PM  
I just swapped springs again, the 1000 on the right front was way to soft. I also changed shocks, I noticed they were rubbing against my springs somehow. I had Bilsteins on there and had to put on stock shocks. I hope that wont screw me up to bad. I'm running right at 1/4" inch toe, 4 1/4 - camber and 5 1/2" + caster right front. 3/4 - camber and 1 1/2" + caster on the left front. I went to a 1200 lf and 1100 rf, gonna see how that reacts. I did by the way get my best finish of the year. I won my heat and finished second in the feature with the 1100lf and 1000rf.

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Scoot
Smith Racing Team
870-365-5989

racer038
Dirt Maniac

Total posts: 111
posted June 01, 2004 06:29 AM  
Let me understand. You got your best finish of the year and now have changed the setup to stock shocks and stiffer springs? Were your lap times faster than usual? If so, why do you want to move away from what worked? You might be binding some suspension components with the lighter RF spring. When you bottom out or bind, that's why you didn't like the handling. If it were me I would try to fix the suspension problem, while keeping the spring and shock combo that gave you your best finish. My 2 cents.

Scoot
Dirt Forum Champ
Total posts: 517
posted June 01, 2004 10:59 AM  
The reason I'm changing springs and shocks is the right front was way to soft. When I would go into the corner it caused my right side exhaust to hit and eventually broke it off. Also it was causing the tie rod to rub on the frame. When I was changing the springs I noticed that the shocks had a new rubbed spot on each one, so I'm putting on the stock shocks that have a smaller shaft. I'm just going to see how it reacts with them. I would much rather run the Bilsteins though.

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Scoot
Smith Racing Team
870-365-5989

36 Race Team
Dirt Full Roller

Total posts: 45
posted June 01, 2004 02:30 PM  
have you ever looked at your right front wear or better yet heat tne tire has after the race. that seems like alot on -camber to be running. we started out with -3 but after checking the heat of the tires found that the inside was alot hotter than the outside so we went to -2.5 helped our car. not sure about banking of your track but something to consider.

Scoot
Dirt Forum Champ
Total posts: 517
posted June 01, 2004 08:17 PM  
I dont know what degree of banking it has, I'll check the right front tire heat this friday and see what its like, Thanks for the input guys.

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Scoot
Smith Racing Team
870-365-5989

    

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