Suspension and Chassis Questions about your suspension? Need chassis advice?

Are stock springs progressive or linear?

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Old Oct 22, 2003 | 11:57 PM
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From: Glen Allen, VA
Are stock springs progressive or linear?

Just as the title says, which are they?
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Old Oct 23, 2003 | 12:10 AM
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From: Salem, NH
Car: 1999 Z28
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Axle/Gears: 3.23 10 Bolt
linear
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Old Oct 23, 2003 | 12:13 AM
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From: Glen Allen, VA
Both the front and rear?
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Old Oct 23, 2003 | 12:14 AM
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From: Salem, NH
Car: 1999 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23 10 Bolt
believe so, could be wrong.
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Old Oct 23, 2003 | 02:26 AM
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From: Changing Tires
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yup both front and rear are linear. IMHO progressive rate springs are a gimmik.
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Old Oct 23, 2003 | 02:31 AM
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From: Glen Allen, VA
Originally posted by CrazyHawaiian
yup both front and rear are linear. IMHO progressive rate springs are a gimmik.
I dunno about a gimmic. They most likely do provide a smoother ride while cruising, but I agree they suck for all out handling. Too unpredictable for me. I will probably will be going with a good set of linear springs like hotchkis. Any other recommendations?
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Old Oct 23, 2003 | 02:32 AM
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From: Salem, NH
Car: 1999 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23 10 Bolt
i dunno, i have the eibach sportlines in my car, their progressive, they are a very nice performing spring. the ride will fool you, it rides VERY nice, it seems as if the springs are much more tame then stock but, then u hit a corner and the handling power is phenomenal. i love em glad i bought them. put in a set and never look back!
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Old Oct 23, 2003 | 10:50 AM
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From: Changing Tires
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I used to run Sportlines in my 91Z. I've also used the Pro-kit on my former 92 B4C. The sloppy spring rate while driving straight on the freeway would cause my front to bottom out if I hit a bump that was too big. It wasnt as bad with the Pro-Kit because the ride height was a little higher allowing me more suspension travel. But I still had issues (with the stock 16's even). Now I run linear rate springs and I feel a huge difference. The ride is stiffer, but the car is a lot more agile. The sloppy feeling of the progressive rate is gone. No more body roll and the car never bottoms out, even over the biggest bump. Comparing my linear setup to the old progressive setup I have to say the progressive setup gets the thumbs down. For someone who wants all out handling capabilities I dont think they are a good choice. I call it a gimmik because the sales pitch leads you to believe they are the best, but in reality they are sloppy when compared to a stiffer linear rate spring.

But I tell you what, if you could actually choose what spring rates to use in the progressive rate spring then I would not be bashing them at all. I think the rates they chose are too soft for our car.
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Old Oct 23, 2003 | 11:54 AM
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I have to agree with the last post. The Pro-Kit is a bit soft and sloppy. It's OK around the street, but there's a bit too much movement at times. It is a step up over the stock springs, IMHO, but a higher rate linear spring would be better.
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Old Oct 23, 2003 | 12:15 PM
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From: Surrey, BC
Originally posted by CrazyHawaiian
I call it a gimmik because the sales pitch leads you to believe they are the best, but in reality they are sloppy when compared to a stiffer linear rate spring.
Yeah progressive springs usually do what they're supposed to but it's the hype from the companies that kind of let you down.
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Old Oct 23, 2003 | 12:25 PM
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From: Springfield, MO
Car: 92 T/A VERT
Engine: LB9
Transmission: AUTO
Axle/Gears: 7.5 / 3.42's
So hotchkis springs are linear front and rear? Who else makes a stiff linear set with a slight drop?
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Old Oct 23, 2003 | 01:32 PM
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CH hit the nail on the head! i agree totally.
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Old Oct 23, 2003 | 02:05 PM
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From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
def. CH summed up most of our views.

another note . . . progressive coils are a little less 'predictable' which is the ultimate goal of really going fast, you need the car to react exactly the same, on every corner. otherwise you won't be able to learn how to push your car to the limit.
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Old Oct 23, 2003 | 09:37 PM
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From: Mostly in water off So. Cal
Car: '87 Chev
Engine: 60*V6
Transmission: DY T700
All I'll say is- I run progressive rear springs, but linear fronts. Gives the *** end a better feel for me and gives better squat in the corner until it locks down to the stiffer rate to prevent bottoming out. They are fine as long as you control them with high rebound damper.
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Old Oct 24, 2003 | 03:29 AM
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Car: 1985 Camaro Z-28
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Hawaiian,
what kind of springrates you have at rear,and how much drop?

Jari
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