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Go Back   SR20 Forum > Main Forums > Chassis & Suspension



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Old 12-05-2007, 07:12 PM   #21 (permalink)
Blair
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No, if you raise the perch then you lose compression and gain rebound.

Why don't you just come up with an invention for it?
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Old 12-05-2007, 07:26 PM   #22 (permalink)
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Originally Posted by SmilyFace View Post
^^^Thanks for making educated clarification. I sort off knew that something was oversimplified in my formula.


So if I rise spring perches I will increase compression travel of dampers and suspension travel...
Sort of. The available travel of the dampers isn't really changing. But the car will be higher, so the overall travel of the suspension system will increase. This only works up to a certain point though. If you raise the spring perches too much, the springs will coil bind before they hit the bump stops, and you will start to lose travel in compression.

If you wanted to increase the total damper travel, you would need to change them with longer stroke dampers. This usually means using longer dampers and, in your case, relocating the suspension mounts. I don't really know of anyone who has gone to that extreme and I'm not sure if this is really worth it for what little off-roading you're going to be doing either.
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Old 12-05-2007, 07:31 PM   #23 (permalink)
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No, if you raise the perch then you lose compression and gain rebound.

Why don't you just come up with an invention for it?
Huh?
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Old 12-06-2007, 07:08 AM   #24 (permalink)
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Sort of. The available travel of the dampers isn't really changing. But the car will be higher, so the overall travel of the suspension system will increase. This only works up to a certain point though. If you raise the spring perches too much, the springs will coil bind before they hit the bump stops, and you will start to lose travel in compression.

If you wanted to increase the total damper travel, you would need to change them with longer stroke dampers. This usually means using longer dampers and, in your case, relocating the suspension mounts. I don't really know of anyone who has gone to that extreme and I'm not sure if this is really worth it for what little off-roading you're going to be doing either.
I see your point. But in reality I'm rising perches by 0.5 inches so that should not make coils to collide. I measured the diameter of the wire and multiplied it by the # of loops and found that the length of compressed spring is less than the length of damper+bumper by about 1+ inch. I know that bumpers also can compress but I highly doubt that they will ever compress by more than 0.5 in.

So that extra 0.5 in is really unused suspension travel that I can take advantage of by moving my perches up by that distance. To be mechanically correct, suspension travel will stay the same, but compression travel form equilibrium position will increase and excursion form the equilibrium position will decrease by the same amout- which is pretty much what i need.

Now I need to make some sort of metal spacers to bring the spring 0.5 in up.
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Old 12-06-2007, 07:51 AM   #25 (permalink)
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Huh?
Nevermind, I'm thinking backwards again.


The "inventions" thread: http://www.sr20forum.com/members-rid...ml#post2197945
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