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What Body Flexing???

kingman

Well-known member
Joined
Jan 1, 2003
Messages
1,533
Location
Georgia
Corvette
2002 Torch Red Coupe
Hi

Tonight l took my wife and dog for a ride with the top off, and l was listening for the body flexing.

I didn't hear a thing, is this something that happens over time?

Or, being that the top was never off it didn't have a chance to start flexing. Another thing is that one of the rear bolts that hold the top down wasn't tight and yet l still didn't hear a thing.

Yes the radio was off and my wife wasn't talking and my dog wasn't barking.

Tough group!!!!!!!!

Alan


p.s. The reason l took the top off was to put a static cling liner in the inside of my clear top to halt the sun's ray's.
 
Not sure what you mean by "listening" to body flex.

Want to "feel" it though? Then, with the top off find a rough road with maybe a double set of RR tracks. Now get her up to 55 or so. Rest your left elbow on the window ledge and rest the palm of your left hand on the top corner of the A pillar. You know, kinda like you're totally relaxed and cruisin' around. You got the picture. Now, feel your hand go in one direction and your elbow in the other. That is body flexing! No, that noise you hear is not the flex, it's just Corvette rattles and quakes. You just gotta love 'em though. :beer
 
Is body flexing anything to be concerned about, or just part of the C4 experience? I cruise with the top off quite a bit this time of year.
 
Your 96's many squeaks are corrected vs the earlier models. Its not going to squeak so much compared to mine.

But you can feel it if youre tuned in to the handling.
 
If you can't feel it you're not tuned into your car. I don't even like to take the roof out at all---to scary:o
 
Moonunit 451 said:
If you can't feel it you're not tuned into your car. I don't even like to take the roof out at all---to scary:o

That maybe true, btu after owning my vette for 10 years, driving with the top off most of the time, you get use to it.

I have even had many people comment on how solid my vette is with the top off and how little cowl shake I get
 
Mine is pathetic, maybe just cause they don't seem to be able to steal enough money from us here in the Republic of Oregon, there's no smooth raodways:( :beer
 
No Shakes Yet!!!!!!!!!!!!!

Hi

Being that l just picked up my 96 in Feb and just took the top off for the first time, l will have to check out the flexing a little further.

But again, l feel that the top only came off a couple of times since it came from the orig dealer, when it was first bought.

l'm sure in time it will flex, but it's too new to tell at this point.

Last night, l was at approx 75mph and pushing it on the off and on ramps and l didn't notice a thing. Now this isn't my first vette, and l drove the 64,67 and 76 so, compared to them this vette isn't flexing enough for me to notice.

Still no new rattles, but l expect to hear them soon.

Alan
 
When I have the top off my ol 92, I notice the body flex a lot. I don't care for it. Seems to me that the front of the car is moving one direction while the rear is going the other. Almost like there is a pivot joint in the middle of the car.

With the roof on, it's pretty solid.

I take the roof off for parades and such and put it back on when the parade is over.

Don't even think about autocrossing a C4 coupe without the solid roof on it.
 
If the flexing bothers you, but you still want the top off, pick up one of RD Racing 's CrossFrames. It's on my list for must-haves, esp. if you autocross. It's like the convertible's x-brace but much better. I'm planning on getting one next spring, after the current batch of performance stuff is done.

BTW - I've already got one of their CrossBar harness/camera bar kits, and love it. It also makes a small flex difference, but not a huge amount.

[RICHR]
 
kingman,

Tuna hit it right on the head with his description of the flex.

You equate body flex with "rattles" and you state "no NEW rattles". The flex propensity is not time related. It is a "built in" extra fun factor to make topless, not vert, vette owners feel At One with every variation in the roadway surface. Time does not create the flex, but time does bring on the rattles, although not as much as pre '95 Vettes. We can all thank well-hidden Velcro straps for that.

I'll bet you that if you travel over fairly uneven RR tracks at about a 20 degree angle and 20 mph or above, you will see what we are talking about. Also, try a sharp wash-board turn. If you do not feel the "whoa there :eek" flex then you have a one-of-a-kind C4.
 
Hi

Trust me l do not have a one of a kind vette, and l wanted to buy one of those cross bar's from R&D, but l cannot find a shop that has done one before and l'm not going to let my vette be a test subject.

l will look for that flex tomorrow, now l'm sorry l inquired. But it will give me something to do until the rattles come back.

Alan
 
<now l'm sorry l inquired>

Alan,

Why did you say that? Did one of us offend you in some way?
 
Only kidding.

I was just making light of it, being that deep down l knew all of the C4's have a flexing problem and l have not experianced it yet
being that l just took the top off for the first time.

Hahahahahah.

Alan
 
Len (nyernga) drove the Tail of the Dragon with his top off and when he tried to put it back on for the return trip he had to express several choice words and use some muscle to convince the top to go back on. I think that was the first time 'body-flex' had caused a problem for him.
Len has a 1988.
Heidi
 
Flex is normal for the C-4, they say it's the way the car is built. With the top off the car is even less rigid so, you would notice it more. I can't imagine the car not flexing with the extremely tight suspension...it would be like driving a rock! I have had mine for ten years and it helps to go over all the screws in the interior once in a while, keeps squeaks down. A corvette shouldn't rattle or squeak...first thing I looked for when I bought it.
 
If you're happy and you know it....

Sounds like your suspension is in fairly good shape. My 94 did flex quite a bit but got better when I put in new ball joints, tie rods, hubs and went through the suspension in general.

You can really notice quite a lot of flex, and even lateral 'hop' on performance cornering, etc. with an out of tune suspension. But if your suspensions in good shape, then you should still have some weird little unexpected jerks, twists or other things that tend to spook a Vette owner until they get used to them.

If you listen to racers like Ron Fellows and others, they refer to it as driving an uncomfortable car. But they learn what the car will do and where to go ahead and push it anyway even though in a 'normal' car it would be a sign of something wrong. In the vette coupe, especially with the top off, you have to come to expect it.

I haven't tried one of those flex bars, but I'm thinking about it. However, I don't like the idea of them because you are putting a structure back over your head when you were trying to go open top in the first place! So you've got to decide what you want. Open top and breezing down PCH1 or thru the canyons....or total 'comfortable' performance inside your closed in cockpit?

I would like to see some sort of 'flex' eliminator that could be installed elsewhere, maybe like a roll cage along the lines of the cockpit before and after the driver. I.e., like a race setup. But obviously much more expensive and while you would be able to have a completely unobstructed top view, you would sacrifice to a more permanent modification in the cockpit.

Here is an interesting idea!

Last night I was watching the 'Monster Garage' show where they were making a 'bucking bronco' car out of an old Ford 'sedan' pickup (I don't remember what Ford's version of the El Camino was called). They installed a large X or cross members under the bottom of the car to prevent it from flexing too much while it was 'bucking'. Otherwise the car would have flex to the point were it became permanently 'twisted' or flexed.

Typically, I don't think we cause anywhere near this much potential flexing in our Vettes when performance driving.

But, it could be a reasonable costs and hidden alternative to fixing the flex problem and would probably add quite a bit of handling performance to boot. It would probably stiffen the ride some, but it's a trade off as with anything.

Besides, the best handling Vettes feel like you're riding on plywood anyway.

I just would like to get rid of the 'break loose' and wheel rumbling feeling that the flex causes when I take the top off.

What ya' thunk?

:_rock
 
Ford's small pickup was the Ranchero, I think. That cross brace you mentioned is the same as what RD Racing's CrossFrame is...
[RICHR]
 
Nice write up "Racer". Very true what you say about lateral hop. But I think the car has that with the top on also. I haven't driven many performance cars in my lifetime. I just figured that a smooth, shock absorbing, quiet and comfortable ride is what you get in today's cars.......or.......stiff, no dip, great steering response is what you get in a sports car. I don't believe you get both from a car, although the mercedes comes close. I have noticed the C-5 handling is very much the same. Bounces the way the C-4 does over a bump on a turn. Tight suspension vs Soft Ride!:w
 
As you know with the vert there is an "X" frame underneath to make up for the lack of overhead structure. Mine surprised my wrench when he had it on the hoist and I went to open the drivers door. No problem, but he says other vettes he has had in will bind at the door frame if they try to open one while it is up on the hoist. Maybe the X-frame OVERcompensates. Mine don't flex much...
 

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