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Old 10-18-2009, 11:59 PM   #1
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Default Shocks, rebound and progressive springs.

Hi.

Do any of you use the rebound (overpressure in the shocks) as a setup factor?

When I drove rc buggies and on-road cars +16 years ago, we used progressive springs. What is the reason why, we don’t use it any more in buggies and truggies?

Eg. on the local track, we have a nasty “Wash Board”. If your front oil is too thin the front bumber hits the first humpback(?) and the rear end fly of in the air.

In this example it would be a benefit to have harder shocks when the shocks is close to complete compressed.

Can this be done with rebound or progressive springs?
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Old 10-19-2009, 11:32 AM   #2
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I've used progressive springs on my old jammin. Didn't notice a huge difference except on shallow bumpy sections. As for the front end bottoming out, I would try smaller piston holes in the front shocks. Just my .02.
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Old 10-19-2009, 11:36 AM   #3
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i havnt tried out progressive springs on my buggy but i have tested full rebond and half i cant tell a diffence maybe its because im not a pro
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Old 10-19-2009, 01:32 PM   #4
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Thanks for your replies.

To prevent my sons Hyper 7 RTR to go to bottom in front, I have the shocks in the inside holes on the arms and the outer lower holes in the tower. Now the shock boots makes the shocks harder when compressed, and the car fly over the wash board, and still runs smooth over the rest of the bumpy track.
It's not political correct, but it works great for bashing...
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Old 10-19-2009, 04:42 PM   #5
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http://www.carolinasrc.com/Webstore/...idproduct=1311

Used these with my X5, ran them in winter on ice, really liked them!
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Old 10-19-2009, 04:45 PM   #6
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how come they dont make them for a losi eight
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Old 10-19-2009, 04:54 PM   #7
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I set my shocks to 25% rebound in the front per Xrays instructions. They don't nessasarily pop out that far after being compressed.

Adding rebound to my cars front made it numb feeling. I don't like it. In the rear it didn't seem to add anything at all.

So without any real gains I keep my rebound set real low to prevent blowouts.


My shock shafts should push there way out a little after being compressed and Not pull them selfs back in after being pulled out all the way.



Where's the shocks with neodymium magnet pistons??????????
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Old 10-19-2009, 08:38 PM   #8
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Thanks again.

Zero:
Cool. Nice to hear that everything is as it has always been. Like you, I'll keep approx. 25% rebound, to be sure that there is no air in the oil.

Cheers
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Old 10-20-2009, 01:33 AM   #9
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Hehe.

Here is a reply from Adam Drake on the Losi forum to a Losi truggy driver:

I usually never run more than 50% rebound on the rear of the truck. You can get about 75%, but anymore than that and the shock wont bottom out.
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Old 10-20-2009, 08:18 AM   #10
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The problem with progressive rate spring is that they have to be spec. to the weight of your car perfectly.

If they aren't then you have to use preload to get the right ride ht. If you compress the spring too much with preload then the soft part of the spring will allready be compressed and you'll be on the stiffer section. It should still get stiffer as its compressed. But the whole point of progressive springs is the extreme soft first 3/8" of compression.


I'm skeptical.
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Old 10-23-2009, 02:28 PM   #11
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Hi Zero.

Sorry for the late reply.

Yep, your thoughts makes sence.

Thanks
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