Rear Spring weight? What to go for?

[Boozshey]

So I just purchased the QA1 Dual Adjustable 175lb Coil-Overs fronts and QA1 Dual Adjustable Rear shocks.

I am currently running the Cobra Jet Springs in the rear. I can't find the exact spring rate, but I'm guessing they are somewhere in the 145-150 range.

I was reading over on yellowbullet and some of those guys are running 300-400lbs springs in the rear.

Should I be going for a stiffer spring? Why are they running such a stiffer spring?

Here is the weight of the car with me in it...

Also, it's an Aluminum Block GT500 drivetrain...

 

[jeostang]

2010+ Cobra Jet rears springs. I'm running them with strange double adjustable rears and coil overs in the front.

 

[Darkness]

After you subtract the unsprung weight you end up at about 1300 lbs. on the rear. Afco recommends 140 lbs. springs.

 

[Bobby]

Subd

 

[Boozshey]

Thanks for the info. Where did you find it?

 

[Darkness]

Afco 2011 catalog. Page 27. The chart is for coil-over springs and they say it's a baseline and you may need to fine tune it.

 

[Darkness]

I'm running Steeda Tokico coil-overs with a 10" 175#. My best 60' is a 1.53. I'm going put in 140# springs in the next few weeks and I'll let you know how they work.

 

[Boozshey]

Yeah please do