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View Full Version : rear springs 13 vs 16


dazed and confused
07-17-2012, 08:50 PM
i run 250lb 13 inch lr with a lot of spacers to get my numbers so i put a 16 200 and saw really no diff
what the diff from a shorter spring stacked up or really tall with preload from the wght of the car
cheaterleaddog
07-17-2012, 11:49 PM
If you set it back to ride height it really should weigh the same.
dazed and confused
07-18-2012, 08:03 PM
yeh i wanted to raise the ride hgt reason for the taller spring bur it only went up a little so i was wondering on length affects on springs
cheaterleaddog
07-18-2012, 11:15 PM
yeh i wanted to raise the ride hgt reason for the taller spring bur it only went up a little so i was wondering on length affects on springs

I bet you have a 1300 # right front
dazed and confused
07-19-2012, 09:08 AM
I bet you have a 1300 # right front

???????????? lf 900 rf 850
MasterSbilt_Racer
07-19-2012, 05:50 PM
Different lengths mean no difference but weight of the spring unless one is too short that it coil binds during operation.
ToddSmith16
07-19-2012, 06:11 PM
13 should work just fine if you run 9.5 in fronts.
cheaterleaddog
07-19-2012, 07:03 PM
???????????? lf 900 rf 850

Now im dazed and confused.
tck
07-20-2012, 06:24 PM
Do you mean you saw no difference on the scales or the track
brad hibbard
07-20-2012, 09:29 PM
I am no longer in the chassis business but can possibly shed some light on this subject

a longer spring has more stored energy

here is an exagerated example of a LR situation

400# 12 inch spring compressed 2 inches has 800#'s of pressure
100# spring compressed 8 inches has 800#'s of pressure

figuring both of these to be at the same exact ride height (and they should be)

when the car rolls rolls up 1 inch the short 400# spring only has 400#'s of force But the long 100# spring in the same amount of roll would still have 700#s of "stored energy"

jmo

Brad
www.race-1.com
dirt fox
08-09-2012, 11:46 PM
So which is better?
3dinter
08-10-2012, 10:27 AM
13 should work just fine if you run 9.5 in fronts.

Are you serious....9.5 up front, when i had a 9.5 in the front on a metric we was dragging the ground on all the bumps....we went to 11" and wont go back.
3dinter
08-13-2012, 09:42 AM
9.5s with wt jacks, lol..

I figure 9.5 would be good for concrete or asphalt ?