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Author Topic:   Rating Coil springs?
Istock66
unregistered Total posts: 70
posted March 31, 2005 03:53 PM           send a private message to C2W   Edit/Delete Message   Reply w/QuoteBBBBBB
I took a bunch of my springs in to a local shop and rated them.

They rated them at 1", and 2" of compression.

I also made them pull some new supsension specialty springs and rate them. these are the ones guaranteed for replacement if they lose 5%.

Suffice to say, the new

1100 rated 1023/1070 (-30)
1350 " 1257/1313 (-37)

My used springs were all about 50#s off. Except one was closer heres mine at 1" and 2" some are different brands.

1098/1109 dont know brand
1100/1150 eibach
1130/1200 light blue
1240/1350 black rubber coated
1280/1350 purple
1230/1375 Afco yellow
Has anyone rated diff brands and had better luck??


marshalr
Dirt Maniac

Total posts: 148
posted March 31, 2005 04:00 PM  
I kinda think your results are pretty typical. Don't throw anything away though. I think you'll find those springs will have pretty much the same rates 10 years from now.
Now you know what you've got.
Now you know why the hot dogs have high dollar machines to rate springs and dynos for shocks.

Istock66
unregistered Total posts: 148
posted March 31, 2005 04:08 PM           send a private message to marshalr   Edit/Delete Message   Reply w/QuoteBBBBBB
Do I go by the 2nd inch of compression rating and forget the first inch rating??

look at the diff in the last 3.

the afco the top coil is collapsed a little so I think thats why it is so far off. but its supposed to be a 1500,lol.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 31, 2005 04:23 PM  
you should go by the 2nd inch of travel. I beleive that is the way most spring manufacturers rate them. (or should in my opinion) Most springs prob arent going to test 'right on'. The advantage is now you know exactly what they are and if you want to make a change to a stiffer spring you know what springs you have to work with.

WE have always ran Hypercoil or Afco. Personally I think Hypercoils are better but thats me.

2870
Dirt Roller

Total posts: 14
posted March 31, 2005 05:38 PM  
I am glad u posted this I66.
We just purchased a hydraulic rate checker & everything we checked was 10 - 15% low.
Yellow 1200# showed 1080, 1400# showed 1230,225# showed 205.
Called the manufacturer & they said within 10% is ok. We felt like after talking to them our results were typical.
They also said to preload the spring at 1/2 its rate then check the next inch.

Eljojo
Dirt Forum Champ
Total posts: 968
posted March 31, 2005 07:57 PM  
I have had about the same results with hydraulic spring raters-IMO all you are doing is getting an approximate rate.
I have bought used springs from MR Racing and they sell the spring based on what their spring rater says it is. I think those used springs from them are closer that the new ones (and more consistant).

Jeff, I am glad to see you are becoming concerned with your spring rates. After our phone conversation I felt that you weren't open to experimenting with different rates.
I'll send you a set up sheet on my Camaro after I get it dialed in. I won't however be able to give you much help on rear spring rates, as I have been forced to return to steel springs and have built the spring stacks myself.

Istock66
unregistered Total posts: 968
posted March 31, 2005 10:28 PM           send a private message to Eljojo   Edit/Delete Message   Reply w/QuoteBBBBBB
John, I was allways concerned I just started low and am working my way up in front springs.

I started at 900 and am to 1350 in the rf, and probably still going to go up.

sideways
Dirt Forum Champ
Total posts: 715
posted April 01, 2005 01:54 PM  
The way we rate them is compress til the needle just barly moves,to put on "preload"then down one inch,then down two inches.Subtract the 2 and this is it.As long as you got a starting point and everybody you may borrow springs from and yall use the same rater it will be good.I will also agree with Eljojo about MR springs.We took stock springs from a mini stock and cut them to the spring rate we wanted then added a spacer.I mean if 30 year old pinto springs havent already "settled and been through the ringer I'll never wear out a set. lol

driver27
Dirt Maniac

Total posts: 194
posted April 04, 2005 11:30 AM  
Dont be so quick to assume that the spring rate tester itself is accurate... Its alot like a torque wrench, they need to be calibrated every so often. If everything is consistently high or low, perhpas the tester is rating high or low. FWIW.

    

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