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Should C8 have springs instead of leafs?

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Old 12-14-2017, 04:24 PM   #41
RedLS6
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The transverse leafs are, no doubt, a very elegant solution. Most who think otherwise don't understand the subleties which make this design so effective. I think too many folks are getting hung up over a G number or over a lap time though, as the only criteria by which a suspension architecture is judged. The decision between coil-overs and transverse leafs will likely be due to a number of factors, including but not limited to packaging, performance (on track and off), space, adjustability, and cost.

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Old 12-14-2017, 04:45 PM   #42
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I wonder if the C8 does move to coilovers if it has something to do with the potential for active aero, as I do recall in the patent that GM made it included adjusting the suspension to maximize the benefit of the aero
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Old 12-14-2017, 05:32 PM   #43
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Quote:
Originally Posted by NewYuriCity View Post
I wonder if the C8 does move to coilovers if it has something to do with the potential for active aero, as I do recall in the patent that GM made it included adjusting the suspension to maximize the benefit of the aero
I would think that is a significant consideration. We did see that GM was submitting patent for active aero earlier this year. And you don't really see anyone developing technology for leafsprings.
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Old 12-14-2017, 05:54 PM   #44
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In any case, here is the C8 suspension and the leafs are bye bye. Say hello to the coil spring!






Last edited by SBC_and_a_stick; 12-14-2017 at 05:57 PM.
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Old 12-14-2017, 06:01 PM   #45
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Or as they say, “asked and answered.” Thanks SBC_and_a_stick!

And for those who want more info:

http://www.roadandtrack.com/new-cars...-cad-drawings/

https://jalopnik.com/heres-some-leak...ett-1821288251
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Old 12-16-2017, 11:06 AM   #46
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Quote:
Originally Posted by SBC_and_a_stick View Post
In any case, here is the C8 suspension and the leafs are bye bye. Say hello to the coil spring!





Well, I know one thing. There's NO WAY I'm buying a mid-engine Corvette if it's going to have MAUVE coil springs....
Tadge is such a jerk. Who put's MAUVE coils on a Corvette? Now, yellow coils with "Jake" symbols on them..I'm in.

Last edited by jimmyb; 12-16-2017 at 11:08 AM.
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Old 12-16-2017, 12:10 PM   #47
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Sure hope the poster is either kidding and knows that color assignment on a CAD drawing is done by a backroom engineer.

I got a call from Tadge three minutes ago that because of the above post, all ME’s with now come standard with Velocity Yellow coils and a Jake emblem — and for the ME’s, we now get to specify, at a $295 color upcharge, every color of every part on our suspension, with a $495 color upcharge, specifying color choice for every part of our motors.
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Old 12-16-2017, 12:25 PM   #48
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Quote:
Originally Posted by SBC_and_a_stick View Post
In any case, here is the C8 suspension and the leafs are bye bye. Say hello to the coil spring!





Does this mean that the ME Vette will corner like the 1990 Sedan Deville that I had decades ago?

And here on this forum I was led to believe that the Vette's leaf springs were the pinnacle of suspension engineering.
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Old 12-16-2017, 01:21 PM   #49
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Quote:
Originally Posted by JoesC5 View Post
Does this mean that the ME Vette will corner like the 1990 Sedan Deville that I had decades ago?
Well, exactly the same correlation=causation argument was made in this very thread regarding the Camaro ZL1. So if you believe that the shape of the spring is what matters, then that is the conclusion you should come to.

(The shape of the spring isn't what matters).
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Old 12-16-2017, 01:55 PM   #50
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Quote:
Originally Posted by elegant View Post
Sure hope the poster is either kidding and knows that color assignment on a CAD drawing is done by a backroom engineer.

I got a call from Tadge three minutes ago that because of the above post, all MEs with now come standard with Velocity Yellow coils and a Jake emblem and for the MEs, we now get to specify, at a $295 color upcharge, every color of every part on our suspension, with a $495 color upcharge, specifying color choice for every part of our motors.
Hence the
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Old 12-16-2017, 05:34 PM   #51
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Quote:
Originally Posted by JoesC5 View Post
Does this mean that the ME Vette will corner like the 1990 Sedan Deville that I had decades ago?

And here on this forum I was led to believe that the Vette's leaf springs were the pinnacle of suspension engineering.
This is 2017. Those aren't run of the mill coil springs. They are helical compression leaf springs! The best of both worlds!

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Old 12-17-2017, 01:26 AM   #52
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Quote:
Originally Posted by firstvettesoon View Post
This is 2017. Those aren't run of the mill coil springs. They are helical compression leaf springs! The best of both worlds!


I'm a huge composite monoleaf fan, but that right there is funny.
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Old 12-17-2017, 10:34 PM   #53
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Quote:
Originally Posted by JerriVette View Post
Leaf springs are lighter and less expensive.
Leaf springs are more expensive than coils. That is even true if you compare the leaf springs under a Chevy pickup vs the coils Dodge uses in their coil spring live axle. The leaf spring in a pickup saves money because you don't have to buy all the other parts (additional trailing links, lateral link, etc). In the case of the Corvette's fiberglass spring they are definitely more expensive than coils. When GM did the C4 they were probably just emammored with the tech. When the C5 came around GM was trying to figure out how to package the suspension (even considered pushrods + bellcranks) they decided the low profile of the leaf spring made the most sense.


Quote:
Originally Posted by range96 View Post
A few grams lighter, too. I'm not so sure if it is as linear, though.
Linear can be a property of the spring alone but when you are talking automotive suspension it's a combination of the spring and suspension kinematics.

General comment, a few people have credited David Hill with the dual mount leaf spring setup. That was an idea GM copied from Fiat but GM combined it with their fiberglass spring technology. The C4 was the first car to used the combination.

Quote:
Originally Posted by torquetube View Post
The commentariat gets hung up on comparatively unimportant stuff that's easy to see and ignores the subtle things that actually matter. Tire compound, geometry, rate, etc. make a car fast. Not the shape of the spring or the color of the shocks.

The transverse leafs are an elegant solution. I'd like to see them stay. But any number of mundane design or production details could tip the balance one way or the other, details that have nothing to do with scoring the ultimate 'ring time.

It's a passenger car and consumer product. Everything is a trade-off. If for example GM wants adjustable ride height on the C8 so it doesn't scrape on speed bumps, they will choose coil springs only because they're easier to integrate with a height adjuster. Big deal.
This post really gets it.
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Old 12-17-2017, 11:00 PM   #54
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Thanks wish I had 1-2 ..I never knew the Chevy pickup trucks had plastic leaf springs like corvettes..

I could care less what springs GM chooses for the rear mid engine corvette as long as it's an awesome performance vehicle...

Happy holidays
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Old 12-18-2017, 01:52 PM   #55
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Quote:
Originally Posted by JerriVette View Post
Thanks wish I had 1-2 ..I never knew the Chevy pickup trucks had plastic leaf springs like corvettes..

I could care less what springs GM chooses for the rear mid engine corvette as long as it's an awesome performance vehicle...

Happy holidays
Sorry, didn't mean to confuse, I don't think GM has ever used fiberglass leaf springs in their full size pickups. They did use them from the factory in some versions of the Astro van and they are an option for heavy trucks
https://liteflex.com/

Anyway, to the best of my knowledge all recent full size pickups have used conventional steel leaf springs with the exception of the Chrysler coil spring + live axle setup on the recent Dodge trucks. The important point was that the leaf springs (even steel ones) are more expensive than coil springs by a significant margin. The savings is in the other parts and assembly steps that aren't needed with a leaf spring design. That's one of the things people overlook when assuming the Corvette leaf spring is a cost saving measure. Well in the truck it only saves money because you don't buy all those suspension arms. The Corvette still has all those suspension arms. The other point is why would GM use this cost savings technology only on the most expensive car they sell, but not the many cheaper models?
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Old 12-21-2017, 12:36 PM   #56
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And the latest leaked CAD image (originally from ZERV) of the front area here in this thread:
https://www.corvetteforum.com/forums...e-zerv-10.html

Last edited by FrankLP; 12-21-2017 at 12:38 PM.
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Old 12-22-2017, 04:30 AM   #57
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Either can be made to work well. Whatever GM deems best for the application once considering weight/ packaging/ cost/ performance/ etc.. is fine with me. I'm sure it will be great.
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Old 12-22-2017, 12:21 PM   #58
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Neither coil spring nor transverse leaf matters much when your alignment drifts all over the map at the track or under spirited driving because your eccentrics slipped. I wish they would give us a lockable system similar to the camber kits on the market. Not that these kits are expensive, they're not.

Last edited by RedLS6; 12-22-2017 at 12:23 PM.
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