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Anybody know what the spring rates are on these 2 cars or were I could find them?
Spring rates as in lbs/in? Never seen that published. They use different springs and pretty sure the T/A is stiffer. The SRT uses the R/T Super Track Pack springs in the front. Rear springs different too. The SRT can use a softer spring then stiffen it back up with the adjustable shocks. What you wanting to do?

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I'm curious after reading this post. So, I decided to take a quick look and found the data. Granted, it's very old back in 2009.

The R/T Charger uses 204 lb/in front and and 514 lb/in rear with Nivomat rear shock.
The R/T Challenger uses 224 front 514 rear with Nivomat rear shock, 547 rear without nivomat.
The 300C SRT8 uses 227f, 622r.
The Charger and Magnum SRT8 use 284f, 778r.
The Challenger SRT8 uses 261f, 669r.

SRT8s sit 1/2" lower than the 5.7L and 3.5L rwd cars.
The cop car springs are 250f, 652 rear (with Nivomat), but sit even taller than base car due to how they are typically loaded down.

http://www.challengertalk.com/forums/f79/can-someone-explain-these-spring-rates-16693/
 

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Interesting numbers, rears are are way heavy. Imagine what Hellcat rates would be.

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Discussion Starter #5 (Edited)
Just found these from Speedlogix SRT and Hellcat

FRONT:
OE rate: 55 N/mm (314 lbs/in)
PRO-KIT progressive rate: 40 - 66 N/mm (228 - 377 lbs/in)
Bump-stop: OE
Damper: OE
Tubing: Yes
OE wheel center to fender: 397 mm (15.6 in)
PRO-KIT wheel center to fender: 369 mm (14.5 in)
PRO-KIT can be aligned to OE Specs: Yes

Front Alignment:
OE Camber = -1.1L, -1.4R deg (+/-0.6 deg)
OE Caster = -0.7 deg (+/-0.6 deg)
OE Toe = 0.20 deg (+/-0.10 deg)
PRO-KIT Camber = -1.6L, -1.9R deg (+/-0.6 deg)
PRO-KIT Caster = -0.9 deg
PRO-KIT Toe = 0.10 deg

REAR:
OE rate: 136 N/mm (777 lbs/in)
PRO-KIT progressive rate: 55 - 164 N/mm (314 - 937 lbs/in)
Damper: OE
Bump-stop: OE
Tubing: N/A
OE wheel center to fender: 416 mm (16.4 in)
PRO-KIT wheel center to fender: 387 mm (15.2 in)
PRO-KIT can be aligned to OE specs: Yes

Rear Alignment:
OE Camber = -0.8 (+/-0.6 deg)
OE Toe = 0.20 deg. (+0.15 deg)
PRO-KIT Camber = -1.1 deg
PRO-KIT Toe = 0.17 deg
Approximate installation time: 1 hr
 

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I'm curious after reading this post. So, I decided to take a quick look and found the data. Granted, it's very old back in 2009.

The R/T Charger uses 204 lb/in front and and 514 lb/in rear with Nivomat rear shock.
The R/T Challenger uses 224 front 514 rear with Nivomat rear shock, 547 rear without nivomat.
The 300C SRT8 uses 227f, 622r.
The Charger and Magnum SRT8 use 284f, 778r.
The Challenger SRT8 uses 261f, 669r.

SRT8s sit 1/2" lower than the 5.7L and 3.5L rwd cars.
The cop car springs are 250f, 652 rear (with Nivomat), but sit even taller than base car due to how they are typically loaded down.

http://www.challengertalk.com/forums/f79/can-someone-explain-these-spring-rates-16693/
Hellcat are 314 front and 777 rear
luke
 

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What is the spring rate of that sweet Jri set up if I might ask?
custom, based on each application and its intended purpose, in other words JJ Furillo from @ultperformancespeed would request additional information and then select the correct set up, springs rates, etc and would also set the coil overs based on the information, from there you have someone you can talk to to assist in adjustment based on driver inputs etc

in other words you would have someone that is one of the best suspension tuner in the country helping you with setups....we went from average to a top 5 competitor in USCA with his JRI Ultimate Performance coil overs and his expertise.....winning an invite on points to the invitational, finishing 3rd in points. Also finishing a career best of 4th overall in GT in Millville NJ

if you want to go fast and turn that's where it starts

 

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ps, currently Bigred is running 700 front and 650 rear, in Vegas we added a spring rubber in the rear to help out of the corners and reduce oversteer

Luke
 
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