dcairns Posted March 31, 2003 Report Share Posted March 31, 2003 Anyone notice a bad bouncing on some cement freeways? There is a stretch out here that really is bad in my SS. My S-10 has an even firmer suspension, and it is not bad on the same freeway. It is like the warping around the expansion joints hits the wrong frequency for the SS. Link to comment Share on other sites More sharing options...
shopman1 Posted March 31, 2003 Report Share Posted March 31, 2003 dcairns, I noticed the exact same thing on a cement highway. I have ordered helper springs for the rear, I will see if they help this problem. I don't seem to have it on pavement. More to come on this. Link to comment Share on other sites More sharing options...
silverado3500 Posted March 31, 2003 Report Share Posted March 31, 2003 That sounds like it may be a shock issue. I have a chevrolet 1500 that did the same thing. I eventually changed the rear leaf springs ( for other reasons ) out for a set of gm 1 ton springs off a wrecker. Even with these springs the truck bounced. I recently lifted the rear with blocks, and at the same time changed the shocks. The bouncing effect was lessened greatly with the change of shocks. If you want a scary ride, drive a truck with the shocks removed. ( Don't try this at home ) Hope that helps. Link to comment Share on other sites More sharing options...
shawn_butler Posted March 31, 2003 Report Share Posted March 31, 2003 I noticed the same thing when I pickup my truck last week. I had to drive a hundred miles back home and here in MI we have cracks in the highways from the winter freeze. Link to comment Share on other sites More sharing options...
dcairns Posted March 31, 2003 Author Report Share Posted March 31, 2003 I wonder if some of those shocks you can adjust from the cab may be the ticket. Might let you tune it out. Link to comment Share on other sites More sharing options...
zippy Posted March 31, 2003 Report Share Posted March 31, 2003 if you chaged shocks i'd recomend QA1's or Edelbrock's. likely though, the problem is caused by the excessive unsprung weight of the 20 inch wheel combo. helper springs are a bad idea on a silverado as the E.P.V. works off of rear ride height. if you need more spring, you need more truck. Link to comment Share on other sites More sharing options...
shopman1 Posted March 31, 2003 Report Share Posted March 31, 2003 if you chaged shocks i'd recomend QA1's or Edelbrock's. likely though, the problem is caused by the excessive unsprung weight of the 20 inch wheel combo. helper springs are a bad idea on a silverado as the E.P.V. works off of rear ride height. if you need more spring, you need more truck. I called what I ordered helper springs, what they are is Roadmasters Active Suspension System. It is designed to reduce the risk of rollover, imporve road holding, eliminate axle warp and wheel hop. These go from the axel to the back of the leaf spring only with a spring in the middle. I hope this does not have a adverse effect on the EVP - 99% of the time I will not have a load. Link to comment Share on other sites More sharing options...
dcairns Posted March 31, 2003 Author Report Share Posted March 31, 2003 I called what I ordered helper springs, what they are is Roadmasters Active Suspension System. It is designed to reduce the risk of rollover, imporve road holding, eliminate axle warp and wheel hop. These go from the axel to the back of the leaf spring only with a spring in the middle. I hope this does not have a adverse effect on the EVP - 99% of the time I will not have a load. I went to their website to see what the heck you were talking about http://www.activesuspension.com As usual, a picture is worth a thousand words Looks kind of interesting for better load handling and cornering, although I don't know if it will help much with the "bounce" problem. I am thinking that Zippy is right about the higher unsprung weight being at the root of the problem. I am hoping the right shock might minimize it. Link to comment Share on other sites More sharing options...
shopman1 Posted March 31, 2003 Report Share Posted March 31, 2003 I called what I ordered helper springs, what they are is Roadmasters Active Suspension System. It is designed to reduce the risk of rollover, imporve road holding, eliminate axle warp and wheel hop. These go from the axel to the back of the leaf spring only with a spring in the middle. I hope this does not have a adverse effect on the EVP - 99% of the time I will not have a load. I went to their website to see what the heck you were talking about http://www.activesuspension.com As usual, a picture is worth a thousand words Looks kind of interesting for better load handling and cornering, although I don't know if it will help much with the "bounce" problem. I am thinking that Zippy is right about the higher unsprung weight being at the root of the problem. I am hoping the right shock might minimize it. Good job. The picture is the hot tip! I will let all know what happens with the modification. Also, if you or anyone else does somthing with the shocks - let us know. Link to comment Share on other sites More sharing options...
zippy Posted April 1, 2003 Report Share Posted April 1, 2003 for any of you unfamilier with the electronic perportioning valve. the 99 and up silverado/sierra trucks use a perportioning valve that determine's how much braking power to send to the rear brakes by the angle of the rear of the truck (they say it's by ride height which is incorrect). as the rear of the truck is loaded it changes the angle and applies more braking power as needed. unloaded and under certain other braking conditions, it helps to prevent lockup/abs engagement in the rear. adding spring rate to the rear takes away some of the braking power at the rear wearing out the front's faster and taking away some braking ability from the truck because the rear brakes aren't given as much power. Link to comment Share on other sites More sharing options...
shopman1 Posted April 1, 2003 Report Share Posted April 1, 2003 I asked Roadmaster Active Suspension if the product would detract from the breaking, this is the answer: Our product enhances the suspension of the vehicle and does not affect vehicle braking in any way. Best Regards, Bud Clark National Marketing Manager Roadmaster Active Suspension 330-D East Hebron Street Charlotte, NC 28273 (800) 398-5036 (704) 523-2646 (704) 523-0259 Fax www.activesuspension.com Link to comment Share on other sites More sharing options...
zippy Posted April 1, 2003 Report Share Posted April 1, 2003 i'm not trying to shoot down your suspension idea, but your asking the company that is selling you their product. if this were asked of a gm engineer i'd assume a different response would be had. Link to comment Share on other sites More sharing options...
dcairns Posted April 11, 2003 Author Report Share Posted April 11, 2003 So does anybody have any opinions about Rancho RS9000X adjustable shocks? They have a 9 position knob on the shock to set firmness. Is the soft position softer than the shock on the SS? If the firmest position going to be firmer than the stock SS shock? For that matter, is the shock on the SS the same sizing as the Silverado 1500 4WD? Link to comment Share on other sites More sharing options...
zippy Posted April 12, 2003 Report Share Posted April 12, 2003 the shock appears to be a big larger and carries a different part number, but i'm not sure what all was changed. the rancho's are a very nice shock although i think you'd be happier with the edelbrock shocks. i've installed them on a few vehicles where an adjustable would have worked great and they do just about everything the adjustable would do without adjustment. my buddy's 00' silverado has them (i installed them) with his 20's and it doesn't have the hop to it. Link to comment Share on other sites More sharing options...
dcairns Posted April 12, 2003 Author Report Share Posted April 12, 2003 I was thinking about the Edelbrocks, but was not sure if it would make the truck "floaty". My wifes Rodeo is that way (not sure what the stock shocks are). Kind of "floaty" in small movements and then it firms up in a hurry. Glad to hear they worked well on an 01 Silverado. Link to comment Share on other sites More sharing options...
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