What suspension w/ DSE Sub frame?

[dhutton]

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

Don

[jcal87]

Originally Posted by dhutton

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

Don

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

[dhutton]

Originally Posted by jcal87

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

No messages.

Don

[TheJDMan]

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.

[Matt@BOS]

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

[jcal87]

Originally Posted by Matt@BOS

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

[Matt@BOS]

Originally Posted by jcal87

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

That is a difficult question to answer. It all comes down to what you want to do with the car, and what kind of mindset you have. I'll do my best to explain the differences you're paying for between single and double, and hopefully you can better decide which route is best for you.

Most shocks have a bypass valve, or valves that control the amount of fluid diverted around the shim stack that fluid is forced through, which controls compression and/or rebound. If you close the valve down, more fluid is forced through the shim stack, which stiffens the shock up.

On a JRi, you're typically given several options. The first is a single adjustable shock which has an adjustable bypass valve that can be configured for either compression adjustment, or "bleed" adjustment, which can be thought of as is compression and rebound controlled by one adjustment.

Double adjustable shocks use that same adjustable bypass valve, and add the ability to change the preload on the actual shim stack itself, which gives you a WAY larger range of adjustment than simply using the "bleed" bypass valve.

In other words, a single adjustable JRi is going to work about the same as a single adjustable Ridetech or similar monotube shock, but a double adjustable JRi is going to give you control over the shim stack that you aren't going to get from pretty much any other shock on the market without taking it apart and re-valving it.

We typically spec non adjustable or single adjustable JRis for customers who want a shock with good all around performance, and might drive on track, but aren't worried about being a top competitor, and we normally order double adjustables for the guys who will use the additional range of adjustment dial in their car for the track, and then dial things back out for a more comfortable ride on the street.

If you're someone that likes to tinker and upgrade, and you've bought stuff twice in search of better performance, you might just want to get the doubles now.

Matt