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Old 06-07-2010, 05:59 PM   #16
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Originally Posted by DANE_TRAIN View Post
You would also be surprised how different the two springs are in the same pack. Koby next time your at McCollough's ask Doug or Shawn what they use to do with their 1/10th scale springs.....haha get ready for story time
Oh lord. I can't wait for this one. Hahaha.
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Old 06-07-2010, 10:25 PM   #17
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i've read on the Losi forum that Adam Drake changes his springs every 6 monthes, so i do the same
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Old 06-07-2010, 10:32 PM   #18
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yes you don't have to change them. i ran my last set for 18 months.(but they are much softer than my new ones). you can also help by not resting the car on its suspension if you are not going to use for a while. and just ont compress for long periods of time.
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Old 06-08-2010, 02:34 AM   #19
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Its two different ratings. Spring load is the amount of weight it
takes to compress the spring to a given height. Spring rate is
the amount of weight it takes to compress a spring a certain amount, for
1-1 springs this is measured in lbs-in. I have no idea about the ratings
that RC manufactures use since they seem to be all over the board.

In other words a spring will sag or take a set over time, but the
actual spring rate remains the same, its only the load rating that
has changed.


Of course some springs require so much preload to get the desired
ride height that its pretty much mandatory to replace them if they
sag. This may very well be what Drake is talking about.

So in other words the answer to the original question would be
yes and no. If the sag is causing ride height problems then yes
they would be considered worn out. No in the sense of them
becoming softer or losing there spring rate.

Last edited by JsK; 06-08-2010 at 02:35 AM. Reason: Spelling
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Old 06-08-2010, 05:00 AM   #20
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Originally Posted by JsK View Post
Its two different ratings. Spring load is the amount of weight it
takes to compress the spring to a given height. Spring rate is
the amount of weight it takes to compress a spring a certain amount, for
1-1 springs this is measured in lbs-in. I have no idea about the ratings
that RC manufactures use since they seem to be all over the board.

In other words a spring will sag or take a set over time, but the
actual spring rate remains the same, its only the load rating that
has changed.


Of course some springs require so much preload to get the desired
ride height that its pretty much mandatory to replace them if they
sag. This may very well be what Drake is talking about.

So in other words the answer to the original question would be
yes and no. If the sag is causing ride height problems then yes
they would be considered worn out. No in the sense of them
becoming softer or losing there spring rate.
interesting - one thing though, if the springs get shorter with time, the coils get closer to each other, in this case the rate *must* change, mustn't it?

Paul
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Old 06-08-2010, 05:45 AM   #21
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I change mine about every 3 months due to them looking ratty... Some of our tracks over here have stones ranging from BB size to golf ball so after a few months of getting stone blasted they look like crap with chips missing from the coating top to bottom.. I did notice that when I put a fresh set on my car seems to react a little bit faster ans seems to carry a tiny bit more speed around the track... Newp I have not checked lap times new vs old.. Could be a mental thing having new springs, raises moral? I dunno. New springs just have that feel of better.
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Old 06-08-2010, 03:19 PM   #22
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Verry intresting read, Had my 2.0 for over a year now and never changed the springs. I don't need to adjust the pre load to keep the ride height the same. I try to put a couple of hours of track time on her a weeek. Reading this makes me want to change them out to compare.
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Old 06-08-2010, 06:44 PM   #23
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Lonestar here is a quick calculation you can do for spring rate that
may help.

G x d x d x d x d / 8 x N x D x D x D = spring rate

G = Torsional modules for steel or 11,250,000 or 11.25
X 10 to the 6th power.

d = Wire diameter in inches.

N = Number of ACTIVE coils.

D = Mean coil diameter in inches.

8 = A constant for all coils.

As you can see nothing in the rate calculation is going to
be changed by the coils moving closer together. BUT...
if a spring colapsed so far that a coil became inactive then
yes the spring rate would change. It would actually increase
though.

The spring rate is determined by the material and dimensions.So
unless the dimensions changed in way that directly affects the
formula then the spring rate remains the same.

Chad I think what your feeling may have more to do with corner
weighting than an actual rate increase from new springs. Its very
possible that even at the same ride height you may end up with
very different corner weights. It would be interesting to set the
car up with the exact same corner weights and ride height for
both sets of springs and do a comparision then.

Last edited by JsK; 06-08-2010 at 06:48 PM. Reason: Spelling
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