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Old 07-03-2012, 01:44 PM   #1
Higgs Boson
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Spring Rates

I only did a quick search and found nothing so this thread is to list the spring rates for stock and aftermarket lowering springs. No coilovers since the rates are not the same (unless you want to include them, just know it's not apples to apples with a regular spring).

V8

Stock Fronts
Stock Rears

Pfadt Fronts 225
Pfadt Rears 425

BMR Front (1") 220
BMR Rear (1") 460

BMR Front (1.4)
BMR Rear (1.4)

Pedder Front
Pedder Rear


Convertible Specific

Hotchkis Front (1") 210
Hotchkis Rears (1") 440

Coilovers

KW Coilovers
FRONT 285
REAR Progressive

ST Coilovers
FRONT 285
REAR Progressive

etc.... of course I don't have any of the info, which is why I started this thread. If you are a vendor/manufacturer and have the info for your springs, please post up so I can create an informative condensed post.

Thanks.

Last edited by Higgs Boson; 07-13-2012 at 02:14 PM.
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Old 07-03-2012, 01:59 PM   #2
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BMR 1"
220
460
Here's a thread I started about the BMR springs.http://www.camaro5.com/forums/showth...R+spring+rates
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Old 07-03-2012, 02:16 PM   #3
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Pfadt Camaro lowering springs (fits both SS and V6 models)

Front: 225
Rear: 425


BEFORE Pfadt lowering springs:



AFTER Pfadt lowering springs:

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Old 07-03-2012, 02:36 PM   #4
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Thanks Chase! You beat me to it!
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Old 07-03-2012, 02:36 PM   #5
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Great thanks, let's keep it going, any springs, all springs, listed in the first post or not, if you have the specs, post them up!
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Old 07-03-2012, 02:54 PM   #6
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Thanks Chase! You beat me to it!


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Old 07-03-2012, 02:56 PM   #7
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Old 07-03-2012, 02:59 PM   #8
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Hochkis 1" drop for convertibles. Front 210lbs/in, Rear 440 lbs/in
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Old 07-05-2012, 11:09 AM   #9
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Let's keep it going, Eibachs, etc, there's a lot more out there than this!
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Old 07-13-2012, 01:39 PM   #10
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KW Coilovers are FRONT 285 REAR Progressive
ST Coilovers are FRONT 285 REAR Progressive

I have a phone call into ST for the rates on their lowering springs.
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Old 11-17-2012, 12:12 PM   #11
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Quote:
Originally Posted by Higgs Boson View Post
I only did a quick search and found nothing so this thread is to list the spring rates for stock and aftermarket lowering springs. No coilovers since the rates are not the same (unless you want to include them, just know it's not apples to apples with a regular spring).

V8

Stock Fronts
Stock Rears

Pfadt Fronts 225
Pfadt Rears 425

BMR Front (1") 220
BMR Rear (1") 460

BMR Front (1.4)
BMR Rear (1.4)

Pedder Front
Pedder Rear


Convertible Specific

Hotchkis Front (1") 210
Hotchkis Rears (1") 440

Coilovers

KW Coilovers
FRONT 285
REAR Progressive

ST Coilovers
FRONT 285
REAR Progressive

etc.... of course I don't have any of the info, which is why I started this thread. If you are a vendor/manufacturer and have the info for your springs, please post up so I can create an informative condensed post.

Thanks.
ST coilovers 285lb front. Are you sure. Those are a very soft application and that spring rate seems a bit too high.
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Old 11-18-2012, 02:24 PM   #12
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Pfadt lowering springs are now 210 front and 395 rear.
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Old 11-18-2012, 05:06 PM   #13
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Quote:
Originally Posted by TheSuspensionSource View Post
KW Coilovers are FRONT 285 REAR Progressive
ST Coilovers are FRONT 285 REAR Progressive

I have a phone call into ST for the rates on their lowering springs.

Do know what the spring rates are in Kg/mm?

The Pedders XAs are 8 kg/mm (front) and 10 kg/mm (rear).
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Old 11-18-2012, 10:30 PM   #14
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Quote:
Originally Posted by Higgs Boson View Post
Let's keep it going, Eibachs, etc, there's a lot more out there than this!
That's funny-I recently tried to make a spreadsheet to compare lowering springs:

https://docs.google.com/spreadsheet/...2JXQjZjNjEzRHc

Stock V8: 165 lbs/in front, 370 lbs/in rear
BMR (V6): 200 lbs/in front, 430 lbs/in rear
Eibach Pro-Kit (V8): 143-222 lbs/in front, 291-485 lbs/in rear

I didn't add any convertible fitments.
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Old 07-12-2014, 08:06 PM   #15
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So an article on the ZL1 in Super Chevy says they used a variable rate (70 N/mm to 45 N/mm )spring in the rear and 27 N/mm in the front (spring rate is the same as an SS).

An Australian physics web site says the conversion is 5.714 lb/in to one N/mm. That equals 400 - 257 lb/in rears and 154 lb/in fronts.

Does that sound right?
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Old 07-13-2014, 12:00 AM   #16
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2010, 2011, 2012, 2013 Camaro SS performance lowering springs 1" Front, 1" Rear #38144 by Eibach

FRONT(143-222 lbs/in)

REAR: (291-485 lbs/in)


I think? lol
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Old 07-14-2014, 08:01 AM   #17
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Ridetech's CoilOvers use a 275 lbs/in in the front and a 500 lbs/in in the rear. We use a linear rate spring.
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Old 07-14-2014, 08:18 AM   #18
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My methodology for checking coil rate is to check the initial rate at 25mm of compression and zero the scale. The the next data point is at 50mm, 25mm additional since the scale was zeroed, then in 25mm increments through 100 / 125mm. This provides me with an accurate measure across the usable range of the coil.

Using free spinning urethane bushings in the suspension takes rate out of setup. Bigger bars 'add' rate. Smaller bars decrease rate. How many coils are in the stack and how much travel is there before coil bind? This is a small sampling of factors in setup.

You need more data than a single static rate measurement to buy the right spring for your car.
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Old 07-14-2014, 12:11 PM   #19
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All of BMR's rear springs are a dual rate linear spring. The first portion of the spring is softer and is compressed by the weight of the car. This first section of spring gives a more consistent ride height and improves spring stability when the suspension is extended. The second section of the spring is the actual "working" portion that is used when driving. BMR front springs are all a true linear spring. Here's the spring rate data on the BMR Springs....

SP019 (1.0" V8 Springs)
Front - 220
Rear - 460
SP022 (1.4" V8 Springs)
Front - 220
Rear - 460
SP052 (1.2" V6 Springs)
Front - 200
Rear - 430
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Old 01-09-2015, 05:59 PM   #20
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Eibach Multi Pro R2 Coilovers (10-11) 225 front/450 Rear
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Old 03-12-2015, 01:17 PM   #21
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What about the 2010, 2011, 2012, 2013 Camaro V6? I always see people ask about these
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Old 07-15-2015, 06:46 PM   #22
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TTT for reference...
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Old 08-24-2015, 12:59 PM   #23
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If my information is correct the stock rates are:
165 front
370 rear
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Old 08-24-2015, 01:23 PM   #24
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Front 150
Rear 300
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Old 08-24-2015, 01:30 PM   #25
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Does anyone know what the spring rates are for the stock 1LE springs?

Why are there 2 reported spring rates for the PFADT springs?
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