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Author Topic:   Changeing coil springs
vosevichs
Dirt Forum Racer

Total posts: 78
posted February 16, 2005 09:42 AM  
How often do you guys change your coil springs. We don't have a spring checker. Ran ours 2 season and they are still 9 1/2 & 13 in. tall. I really need to find a spring checker to know for sure.

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Scott Vosevich
RDBoyz Racing

[This message has been edited by vosevichs (edited February 18, 2005).]

WPP
Dirt Freak

Total posts: 451
posted February 16, 2005 10:14 AM  
I have called afco on that and they told me if the spring is the same lenghth it has not changed but i have not check them was a spring checker

zeroracing
Dirt Forum Champ
Total posts: 1875
posted February 16, 2005 10:46 AM  
i check the hieghts on mine. as long as they stay within 2% of original hieght they are still supposed to be good.
but a friend claimed he could feel the difference in his late model, it all of a sudden started driving eratic, so he thought shock went bad so took them off and dropped a spring it hit the floor with a thud and did not have much of a bounce to it. he put a new spring in its place and changed nothing else and it fixed the car, this was a veteran driver that was rookie of the year and top 10 points in a large late model touring series, so knows alot about cars.
this brings me to the question, can a coil go bad?
i mean have the same rate but spring back differently, factors like heat, rough tracks, chips from rocks, partial bowing of the spring... i dont have the answer to this, but would like to hear some input, do you guys feel that a coil could go bad in such a way? would be a nice experiment to "rough in" a spring and see how it reacts compaired to a off the shelf one.

dluna
Dirt Freak

Total posts: 334
posted February 16, 2005 01:42 PM  
Two months ago, I took every spring that I owned (11 springs) to a guy's shop and tested them out. We have raced with all but one of these springs for 4 seasons now. Every spring I tested was within 5 lbs of what it was rated at. I was definitely surprised by this.

NJantz
Dirt Forum Champ
Total posts: 755
posted February 16, 2005 02:29 PM  
Thanks dluna, were those AFCOILS?

dluna
Dirt Freak

Total posts: 334
posted February 16, 2005 03:53 PM  
The 10 that have been raced for 4 seasons are AFCOILS. The 11th is a HYPER and has been raced for 2 seasons. 225# and I tested it 2 times and got exactly 225.

NOTE: I would say on average, the last 4 seasons we have ran around 16 or 17 races per year. So most likely a little less than some. If only our engines were as reliable as our spring rates

mod70
unregistered Total posts: 334
posted February 16, 2005 04:45 PM           send a private message to dluna   Edit/Delete Message   Reply w/QuoteBBBBBB
z - of course a coil can go bad. The metal will go through temp changes as it compresses and rebounds. Eventualy it will take the temper out of the spring and it will not react the same. How long this takes I can't say.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted February 17, 2005 10:22 AM  
http://www.bluecoilspring.com/rate2.htm


Read this. Esp. #3

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted February 17, 2005 05:50 PM  
Cool reading there. I know they deal with coil springs for a living but I tend to disagree. I can see how a spring would lose its rate. My LR spring last year messed up. The car started losing ride height and as I twisted the wedge bolts it was not reacting as it should. Meaning it seemed to compress the spring more than it was lifting the chassis. I replaced the spring and it increased forward bite and put my ride height back where it was supposed to be. These were Speedway Tru-coils.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted February 17, 2005 07:52 PM  
Thats probably why Flynlo... Get rid of those junk springs and run Afco or Hypercoils

sdracer12
Dirt Maniac

Total posts: 180
posted February 17, 2005 11:01 PM  
"I don't change my springs, because they don't really wear out". After long conversations with Afco and Mark Bush, I have to agree with them about this statement.

I measure the free height of all my springs, and check them against this measurement from time to time. I've got 15 Afco springs which I had checked, and they were all exactly, or very close to, their original rate. We just painted them up and put them back in the car. Some of these springs have over 120-150 shows on them. This doesn't mean I've never bought a new spring. I have replaced a couple of springs which rated out correctly, but I wanted to change them anyway, just because, lol.

I only use good quality springs, Afcoils or Hypercoils.

Afcoils are guranteed for LIFE to not lose more than 2% free height, or they will replace it for FREE. Anyone ever tried out the guarantee? (the certificate comes in every new spring box).


vosevichs
Dirt Forum Racer

Total posts: 78
posted February 18, 2005 06:22 AM  
If their close to their original rate then they are wearing out just a bit. Right? I find it hard to belive that a spring don't wear out. I believe it's the quality of the material and the manufacturing of the spring that determines how long they'll last. A buddy of mine springs were an 1 1/2" shorter in the rear and a 1" in the front after a couple of seasons. But we never checked the rate. I can't remember the manufacturer.

We're running AFCO springs and they're spot on their free height. 2 seasons on them. Still want to check their rate. Trying to find someone in the St. Louis Mo. area with a coil spring tester. Anybody?????

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Scott Vosevich
RDBoyz Racing

[This message has been edited by vosevichs (edited February 18, 2005).]

andykmod
Dirt Freak

Total posts: 351
posted February 18, 2005 07:39 AM  
How much is 2% of a 9 1/2 spring anyway ? Seems like quite abit height change to me.

vosevichs
Dirt Forum Racer

Total posts: 78
posted February 18, 2005 08:55 AM  
It's not much at all. A little les than 1/20th of an inch

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Scott Vosevich
RDBoyz Racing

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted February 18, 2005 03:50 PM  
Xtreme,
Have you had trouble with the speedway springs? Or has anyone had trouble with them? (Besides me!) Has anyone ever ran the SCP springs from stock car products? I know they are $49.95 for two. Seems awfully cheap........

sdracer12
Dirt Maniac

Total posts: 180
posted February 18, 2005 10:35 PM  
[QUOTE]Originally posted by vosevichs:
[B]If their close to their original rate then they are wearing out just a bit. Right?

No, actually not. I should have been more specific. The rates were within 1-4 lbs. of rate, which is probably more my own operator error when measuring, than the springs actually changing rate.

The new springs I have measured and then run, and then re-measured only changed around a 1/16th inch. New springs usually take a set after they have been run, and then they shouldn't change from there.

If your buddy's springs changed 1 to 1-1/2" in free height, I would be willing to bet they are junk.

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted February 18, 2005 10:48 PM  
Trust me, just spend the 50 a spring and get the Afcoil's. They have a garuntee with them not to lose a certain height someone posted it on this post im just too lazy to re read them

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted February 18, 2005 11:42 PM  
I was originally using Afcoils, and I changed to the Tru-coils. For no reason really. Guess I'll go back to Afcoils.

vosevichs
Dirt Forum Racer

Total posts: 78
posted February 22, 2005 08:33 AM  
Oh yes they were junk. And really cheap. sdracer you are right a spring will set. I talked to a couple of chassis builders around here and they recommend changing yearly. They say you'll notice a big difference in the car. I know a guy who sent his springs back to AFCO. He replaced his springs and there was such a difference in the car. He sent them back. They sent them back saying they were still good.

Any way we bought new springs. We'll see how it does on playday.

Thanks for your input guys.

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Scott Vosevich
RDBoyz Racing

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