I went from my old non adjustable 450lbs to 550 Jr I single and my car handles amazing with that setup. I’m still running the 250lb rear spring. My buddy has a set of non adjustable a laying around that he might sell you for the same subframe and Quadra link. If you want a great ride and handle well just go with the single adjustable 550 and 250 springs. If you want to race it more go with a slightly stiff spring and adjustable with remote canister. Call jri and dse. They are helpful.

Also where are you located?

Well it already has the 450 and 250 in the rear. I called DSE today and they recommended the single adjustable JRI’s that they are putting on there frames now. I am in located in McKinney


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the 450's they were sending with subframes was too soft out of the box. hence the reason you have a blown shock. 550 is plenty and will give a good ride, 250 in the rear is fine as well.

Curious what shop is recommending those high spring rates. They are pretty hard core.

Don

I run 650lbs/in front
And 425lb/in rear

It's a 68 Camaro with a 572BBC so it's nose heavy.
My second set of springs and now springs are perfect for spirited driving!
I autocross the car but don't get crazy
I lean on it pretty hard on the street

I thought I sent you a DM. Did it not go through?

No messages.

Don

I was originally running 550 front and 250 rear springs on Dust Off with my DSE sub and G-Link 4 link rear with AFCO double adjustable shocks all around. I had a problem with the car porpoising at speeds above 110 which the shocks could not control even with maxed out rebound settings. I thought the shocks were the problem but before I did anything I contacted Rod Prouty and after discussing the situation he recommended upping the spring rate to 800 front 300 rear. After installing the new springs I was able to tune out the porpoising without having to max out the current shock settings. I was concerned that street ride quality would suffer but I was pleasantly surprised to find that by using a softer shock setting on the street the ride was surprisingly smooth. Based on my experience I would not hesitate recommending higher rate springs with double adjustable shocks so you can tune for both street and high speed track.



https://scontent.fric1-1.fna.fbcdn.n...1f&oe=5DC05122

I've driven about 30k miles on the street, autocross and track with a full DSE setup and double adjustable JRi shocks under my car with an LS. It weighs about 3500lbs and I've always run between 600-750lb front and 400-500lb rear springs.

With a good set of double adjustable JRis valved by JJ, those spring rates are right in line with what most people with DSE suspension and JRis by JJ are using to autocross these days. 800lb/in is a little bit heavier than normal, but we're also talking about a car with an SBC, and if the shop that spec'd that rate has plenty of experience, I see no reason to go with anything other than their experience.

I can also tell you from my personal experience that the recommended spring and shock combo isn't overly harsh or un-compliant feeling. The front end should ride really, really nicely with the rebound backed out a bit.

Matt

Do you think it is worth to go with double versus single adjustable? its double the price so I have been ify about it