Suspension Question...what causes "hop" or "jump" when you hit a bump at higher speed
Ok so Iam going around a corner at about 75 that is on a 2 lane highway. The corner is a onramp bridge connecting 1 highway with another. The bridge is one of those segmented bridges that has connections that don't fit or line up perfectly thus causing bumps between the 2 parts joining together. So is it just perfectly normal that even on a high performance car such as the C5 corvette that when your going this fast (the speed limit said 65 for going around this somewhat sharp turn) that your corvette would hop or bounce out and give you a bit of a scare for stepping out and hopping over to the right a bit. I know it wasn't long that the car was in the air but it felt it. When it touched down, cruise kicked off, active handing enabled, and etc etc. I just didn't expect the car to launch and jump the way it did as there was no physical bump that I saw in the road? My car has 78,000 miles on it. Could it possibly be that the shocks are going? I tried bouncing the rear up and down and I don't get any type of bouncing or anything. I don't see any fluid from the shocks either. Are our shocks good to 100,000 miles?
Thanks Jeff |
When I first bought my FRC, I had similar issues as you with my OEM Z51 shocks (they had 60K on them). When I pulled them off to install the Bilstein Sports, they seemed to have really good pressure still...That being said, the Bilstein Sport shocks did improve the hopping/sidestepping issue when hitting a bump while going through a curve...
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Originally Posted by Gideon's_Test
(Post 1570817155)
When I first bought my FRC, I had similar issues as you with my OEM Z51 shocks (they had 60K on them). When I pulled them off to install the Bilstein Sports, they seemed to have really good pressure still...That being said, the Bilstein Sport shocks did improve the hopping/sidestepping issue when hitting a bump while going through a curve...
Bilstein Sports huh...what did you pay for em? Did you notice any change as far as harshness of your ride? |
I paid $300 shipped...They are firmer than Z51 shocks...Once in awhile I think when I go over a particularly noticable bump that maybe they are a smidge too firm, then when I'm accelerating through a freeway entrance ramp I think "nah, it's great, wouldn't change a thing"...
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What tires are on the car? How old are they? Are you lowered? These things will also affect the ability of the car to handle mid-corner bumps.
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Originally Posted by TarHeelDan2001
(Post 1570817904)
What tires are on the car? How old are they? Are you lowered? These things will also affect the ability of the car to handle mid-corner bumps.
Old tire and car lowered too much will hurt performance quite a bit |
Originally Posted by XtremeVette
(Post 1570817385)
"sidestepping"...EXACTLY! I knew there was a term for it...just couldn't think of it...thanks man!:thumbs:
Bilstein Sports huh...what did you pay for em? Did you notice any change as far as harshness of your ride? |
Originally Posted by AU N EGL
(Post 1570817931)
These three are the biggest factors.
Old tire and car lowered too much will hurt performance quite a bit Car has not been altered at all from the stock suspension setup other then it has a C5-Z06 rear swaybar, the front sway was the same thickness bar as the C5Z (I looked up the code). It has not been lowered. |
Originally Posted by Jims79
(Post 1570818040)
:iagree: you could use new shocks. However don't be supprised if this happens again on the same section of road. I think the traction control may have kicked in when the tire hopped. Go around the same ramp and this time turn off the traction control.
Go around the same ramp and this time turn off the traction control. Wouldn't that be a bad idea? lol |
Originally Posted by XtremeVette
(Post 1570818222)
Yes traction control did kick in....
:eek::eek::eek::eek: Wouldn't that be a bad idea? lol |
Originally Posted by Jims79
(Post 1570818372)
Not at all. If you like to drive your vette hard and want more control over the car turn off the traction. Have you ever driven an older high performance car or sports car that didn't have traction control. That's whats driving is all about. :steering:
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Originally Posted by XtremeVette
(Post 1570818427)
Well yeh...but I like my car and in this case I think the traction control did what it was suppose to and kept control over the situation. Had it not been on...Iam guessing the sidestepping might have been complimented by possible oversteer to correct the problem when steering may not have been needed at all. As you have mentioned...these cars are not your older high performance cars (if you want to call them that). Either way...it was all good. Just trying to see if I can get it to better keep the tires to the payment.
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Run flats have VERY STIFF SIDEWALLS. yes that will contribute to wheel hop
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SHOCKS!!!! My 02 ZO6 did this BAD! I can scare the crap out of you! :eek:
I changed to C6 ZO6 shocks. Problem SOLVED! im 100% happy. Gene Culley has them new for $245 They fit like OEM and are a very good upgrade!! Check out this post for more info! http://forums.corvetteforum.com/c5-t...or-the-c5.html www.gmpartshouse.com Call Gene!!:flag: Bill |
rear tie rods going bad can cause this too. not sure how common the issue is on street-only cars, commmon problem with track cars and may cause similar behavior.
yeah 80k is a lot of mileage for shocks |
Originally Posted by Bill Curlee
(Post 1570819097)
SHOCKS!!!! My 02 ZO6 did this BAD! I can scare the crap out of you! :eek:
I changed to C6 ZO6 shocks. Problem SOLVED! im 100% happy. Gene Culley has them new for $245 They fit like OEM and are a very good upgrade!! Check out this post for more info! http://forums.corvetteforum.com/c5-t...or-the-c5.html www.gmpartshouse.com Call Gene!!:flag: Bill |
NO! There fine for me but of course,,,I own a ZO6 so my assseatOmeter is NOT that sensitive to a rougher ride. There a little more firm than the 02 Z shocks but nothing to complain about. I had F-45 shocks :ack: on my 98 so,,,I cant compare stock Coupe/vert shock to the Z shocks.
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Originally Posted by AU N EGL
(Post 1570818961)
Run flats have VERY STIFF SIDEWALLS. yes that will contribute to wheel hop
Had the same deal on the way to the former AFR facility....long sweeping on ramp / bridge that had a big expansion joint in it.....first time I hit that thing kinda purposely pushing my car in the turn a bit (and enjoying some lateral G's), it scared the crap out of me.....car hopped a few inches over and I was afraid I might lose it at that speed. It stayed in the line again but the pucker factor was big....LOL I took that same turn every day with the same results (truth be told going a little slower....LOL) until swapping out of the runcraps.....went to Nitto' RII's at the time and no step out whatsoever on the same road and the same approach speed I originally hit it at after creeping up experimenting. Just felt like a normal bump but it didnt upset the suspension at all. Ditch the tires and dont buy another runflat.....you will be glad you did and wished you had done it sooner! -Tony |
I agree the runflats are the biggest contributor to your handling problem!
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BTW, your car may not have actually caught air. When you go over a rise you and your car get lighter and that decreases the available traction. So if you were turning and right at the limit going up the rise, you will lose traction as you go over the peak and your rear will step out a bit.
But yeah, if you have runflats and bad shocks this will only exacerbate the problem. The runflats are a joke and are downright dangerous if you're trying to use your Vette they way it should be. |
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