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Old 11-17-2010, 03:04 AM   #1
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Hi guys,can anyone tell me what 50% rebound means when it comes to shocks. I run a TC5 and the setup sheet sais rebound should be set at 50%. Not sure exactly what they mean. Also how do you measure it?
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Old 11-17-2010, 03:22 AM   #2
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Hi guys,can anyone tell me what 50% rebound means when it comes to shocks. I run a TC5 and the setup sheet sais rebound should be set at 50%. Not sure exactly what they mean. Also how do you measure it?
Anthony.
I think it means when you compress that shaft of a built shock (without spring attached), the shaft returns 50% of the full stroke when released.

So 0%/no rebound : shaft doesnt spring back when compressed
100%: shaft comes all the way out when compressed and released.
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Old 11-17-2010, 03:41 AM   #3
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Rebound is the result you get when you fully compress the piston, creating pressure. This pressure forces the piston back down. And that is what is known as rebound. It has more to do with car setup, than anything else.

50% seems a lot, even for a low traction surface. I would imagine that having the shock rod fully extended would be 100%. And you would measure that from the bottom of the shock body to the base of the ball cup. So half of that would be 50%.
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Old 11-17-2010, 04:41 AM   #4
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How much does shock rebound effect a cars handling?? I am kind of new to touring cars and always wondered..
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Old 11-17-2010, 05:16 AM   #5
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Thumbs up Rebound

Thanks RC Square, and FoxRocket, that has helped.
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Old 11-17-2010, 05:32 AM   #6
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The new school on building shocks usually involves drilling holes in the shock caps resulting in zero rebound. It's easier to tune the car without trying to build shocks with equal rebound. Really unless your surface is really low traction you don't need rebound anyway. Now of your racing on sealed asphalt you may wanna piss with the rebound thing, but I would try without first, save yourself a lot of headaches, especially with associated shocks
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Old 11-17-2010, 09:31 AM   #7
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I've learnd that having no redound is a good thing.
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Old 11-17-2010, 09:35 AM   #8
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I've always ran with 50% rebound. I need to rebuild my shocks. I'll try taking it all out.
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Old 11-17-2010, 07:43 PM   #9
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I have been running my shocks without rebound for few years but its pain constantly rebuilding your shocks due to having less oil inside the cylinder to get 0% rebound and any shocks will have small lick no matter what you are using overtime and the effect is you will end up with negative rebound. which will greatly affect the handling of th car. So now I have my shocks with 100% rebound I just play with the oil and piston to get the right dampening.
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Old 11-17-2010, 08:19 PM   #10
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I have been running my shocks without rebound for few years but its pain constantly rebuilding your shocks due to having less oil inside the cylinder to get 0% rebound and any shocks will have small lick no matter what you are using overtime and the effect is you will end up with negative rebound. which will greatly affect the handling of th car. So now I have my shocks with 100% rebound I just play with the oil and piston to get the right dampening.
Yep...100% or damn close
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Old 11-17-2010, 09:32 PM   #11
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But as you guys say, you're going to have some sort of leak no matter what. Even if you are filling the shock with more fluid, giving you more rebound, you are going to loose some fluid making you're rebound become less as time goes on.

In the past, I have used the amount of rebound I have as a gauge of when to rebuild me shocks. It has been as few as 3 runs. Regardless of the amount of rebound, I keep all four shocks as equal as possible. The amount of rebound has never affected how long I can go between shock rebuilds.

Shock building is tiresome, but with the amount of a difference it makes in terms of handling, it is a necessary evil that I enjoy.
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Old 11-17-2010, 09:41 PM   #12
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But as you guys say, you're going to have some sort of leak no matter what. Even if you are filling the shock with more fluid, giving you more rebound, you are going to loose some fluid making you're rebound become less as time goes on.

In the past, I have used the amount of rebound I have as a gauge of when to rebuild me shocks. It has been as few as 3 runs. Regardless of the amount of rebound, I keep all four shocks as equal as possible. The amount of rebound has never affected how long I can go between shock rebuilds.

Shock building is tiresome, but with the amount of a difference it makes in terms of handling, it is a necessary evil that I enjoy.
It is tiresome & a necessary evil but owning and building Schumacher shocks for a few years, I've really grown to embrace shock building tediousness
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