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Coil Overs vs leafs

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Old Aug 21, 2011 | 01:34 PM
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Default Coil Overs vs leafs

For an HPDE driver, what are the advantages of going to a good set of coil overs as opposed to the transverse spring the Z06 comes equipped with?

Thanks
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Old Aug 21, 2011 | 02:00 PM
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other than reducing/eliminating wheel hop and a softer ride maybe I believe a spring is a spring is a spring so it won't help much more overall. I believe the coilovers add some weight also. Just from the research I have done on this forum, not real world experience so take this as a grain of salt. Im sure someone with coilovers/track experience will know more and chime in!
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Old Aug 21, 2011 | 03:04 PM
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Originally Posted by rmoudry
For an HPDE driver, what are the advantages of going to a good set of coil overs as opposed to the transverse spring the Z06 comes equipped with?

Thanks
The advantage is that you can adjust the spring rate by changing springs.
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Old Aug 21, 2011 | 03:13 PM
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Originally Posted by torquetube
The advantage is that you can adjust the spring rate by changing springs.
Ditto with transverse composite leaf springs.

For an HPDE type of person, I don't think they'll be changing springs for every track.
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Old Aug 21, 2011 | 04:25 PM
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Originally Posted by rmoudry
For an HPDE driver, what are the advantages of going to a good set of coil overs as opposed to the transverse spring the Z06 comes equipped with?

Thanks
Coilovers are more adjustable, spring pre-load and one to two adjustments on the shock.

Our stock suspension is also adjustable for corner weighting. If you don't like something about the stock suspension it is probably the shocks. I have Pfadt adjustable shocks and love them, super smooth.
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Old Aug 21, 2011 | 04:51 PM
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There really is no comparison. The coil overs are amazing. the car will ride better, handle better, and respond to the road / driver better. I love my LG coil overs. The ability to adjust the spring rate, ride height, etc is amazing as well.
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Old Aug 21, 2011 | 05:09 PM
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Originally Posted by glass slipper
Ditto with transverse composite leaf springs.
True, but they're harder to come by.
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Old Aug 21, 2011 | 05:18 PM
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Originally Posted by Tim05C6Z51
There really is no comparison. The coil overs are amazing. the car will ride better, handle better, and respond to the road / driver better. I love my LG coil overs. The ability to adjust the spring rate, ride height, etc is amazing as well.
That's all in the shocks, a spring is a spring.
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Old Aug 21, 2011 | 05:19 PM
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Originally Posted by Tim05C6Z51
There really is no comparison. The coil overs are amazing. the car will ride better, handle better, and respond to the road / driver better. I love my LG coil overs. The ability to adjust the spring rate, ride height, etc is amazing as well.
I have Pfadt, but my comments are the same. Plus they look really cool.

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Old Aug 21, 2011 | 05:21 PM
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Originally Posted by LTC Z06
That's all in the shocks, a spring is a spring.
So spring preload is not something that can matter?


Elmer
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Old Aug 21, 2011 | 09:03 PM
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Originally Posted by eboggs_jkvl
So spring preload is not something that can matter?


Elmer
Our stock springs are adjustable.
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Old Aug 21, 2011 | 10:07 PM
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Default Pfadt Aggressor

I changed from my C6 Z51 -05 suspension to Pfadt Aggressor and made 2 seconds on Palm Beach International Raceway which is my reference track. I changed both coil overs and sway bars so I would not know how much made from each. I think the car is easier to drive on the limit than before.

There are always stories to be told, with different driver material, tires etc. But I do have a friend in a Grand Sport. He was faster than me before I changed my suspension. Now, not any longer. His car rolls slightly on track, mine lays flat.

Just a vid from the first track day with the Pfadt suspension
http://www.youtube.com/watch?v=7XfrUYnPUfc

I would recommend this upgrade to anyone that takes his car to track. For street only use, nah..

PeO.
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Old Aug 21, 2011 | 10:30 PM
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Originally Posted by LTC Z06
Our stock springs are adjustable.

Excellent. Is that pre-loading or are you just raising the height? I have a feeling they are not pre-loading the spring by turning that bolt.

Elmer
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Old Aug 22, 2011 | 03:32 AM
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Originally Posted by torquetube
True, but they're harder to come by.
http://www.vansteel.com/index.cfm?fu...&SubGroup=1951
http://www.vbandp.com/C6-Corvettes/S...s/Springs.html

Just two places you can find springs at so they're readily available and you can order custom spring rates if desired. If you mean harder to come by as in more expensive, that is certainly true.
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Old Aug 22, 2011 | 03:35 AM
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Originally Posted by eboggs_jkvl
Excellent. Is that pre-loading or are you just raising the height? I have a feeling they are not pre-loading the spring by turning that bolt.

Elmer
What do you think is happening when you turn the collar on the coilover? You're not "pre-loading" anything, you're adjusting the height!
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Old Aug 22, 2011 | 03:46 AM
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Originally Posted by Tim05C6Z51
There really is no comparison. The coil overs are amazing. the car will ride better, handle better, and respond to the road / driver better. I love my LG coil overs. The ability to adjust the spring rate, ride height, etc is amazing as well.
The spring rate is not adjustable, just ride height. You'll have to change the spring if you want a different spring rate. Also, when going from transverse composite leaf springs to coilovers, a better ride AND better handling are mutually exclusive characteristics.
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Old Aug 22, 2011 | 04:13 AM
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Originally Posted by PeOR
I changed from my C6 Z51 -05 suspension to Pfadt Aggressor and made 2 seconds on Palm Beach International Raceway which is my reference track. I changed both coil overs and sway bars so I would not know how much made from each. I think the car is easier to drive on the limit than before.

I would recommend this upgrade to anyone that takes his car to track. For street only use, nah..

PeO.
The alignment was also changed which would affect how the car responds at the limit. Did you also put new tires on after the mod? As you said, too many changes were made to attribute any gains to any one change. It would have been interesting to see the difference stabilizer bars alone made, then alignment, then tires, then the same shocks as coilovers but without the coil springs, then the full coilovers. Even more interesting would be to put the T1 leaf springs in using the same shocks for a true back-to-back comparison...I think people would be very surprised at the results.

Interesting that you said "nah" for street use. Could you give more details as to why you'd say that? Is the ride too stiff for the street?
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Old Aug 22, 2011 | 09:59 AM
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Originally Posted by eboggs_jkvl
Excellent. Is that pre-loading or are you just raising the height? I have a feeling they are not pre-loading the spring by turning that bolt.

Elmer
Shortening or lengthening the spring's range of movement also changes ride height.
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Old Aug 22, 2011 | 01:54 PM
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Originally Posted by LTC Z06
Shortening or lengthening the spring's range of movement also changes ride height.

Well, there are two adjustments on my coil overs. One is for ride height and the other is for pre-load. I'm leaning to believe that since there are 2 adjustments, that just maybe they might be something adjusted separately.

I can set the preload, then set the height and won't affect the ride height.


But, I'm old and I could be mistaken...


Elmer


Oops, edit! 3 adjustments. I can adjust the shock absorber for firm to soft ride. My bad, I missed that one.

Last edited by eboggs_jkvl; Aug 22, 2011 at 02:10 PM.
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Old Aug 22, 2011 | 01:55 PM
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Originally Posted by rmoudry
For an HPDE driver, what are the advantages of going to a good set of coil overs as opposed to the transverse spring the Z06 comes equipped with?

Thanks
There are a number of advantages that you can go with when doing coil overs.

Some of the big ones are:
  • Ability to change ride height more than stock
  • Ability to spec spring rates
  • ability to tune suspension more than stock
  • removes weight
  • more car control by having a shock and a spring at each corner

Take our G2 Bilstein units for example. These will remove 16.8 lbs total off of the car and also remove unsprung weight as the shock bodies are supported by the frame of the car, not the control arm (also known as an inverted shock).

All of our coil overs, both GT2 and G2 coil overs use a mono ball pivot point for zero binding in the suspension. As you know the shocks travel through an arc movement as the control arms move so the shock needs to pivot. In factory form they have to bend through a rubber mount. This actually effects wheel rate as well. By going to a bearing pivot, this allows the shock to travel freely.

Also you have the ability to custom tune shock valving rates as well as spring rates to more custom tune the car into what you are using the car for, not for the masses that GM did.


Along with sway bars, adjustable end links...coil overs are a great way to improve both the ride and handling of your Corvette.
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