FrankBarba
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Does anyone know the exact spring rate for the ACR. Both front & rear? also the height of the spring & the inside diameter..both front & rear....info appreciated.
SPRING RATES ACR
- Thread starter FrankBarba
- Start date
Mike H
Enthusiast
I think I remember , 550 front, 1100 rear.....
kverges
Enthusiast
I think the earlier ACR that uses the KONI 2812 damper has 400 front, 700 rear, 2.25" ID racing springs. The later Racing Dunamic Dampers are higher, and the 550/1100 combo may be right. I think the spring ID will be the same, it is a standard.
SAM Team
Enthusiast
Does anyone want to purchase the tools to adjust the ride height on the shocks for a 99 ACR. I have them(both) make me an offer.
Frank Parise
VCA Venom Member
Frank, the inside diameter will depend on your shocks. On our team, we use the 2.5" I.D. with Penske and JRZ shocks. The spring length is 8". We use helper springs to keep them engaged with the shock collars during full droop.
The optimal spring rates will vary with many things such as driver preference, chassis set-up, and your shock valving just to name a few. When you have your shocks valved, they will want to know your spring rates to do a proper job.
If you are coming from a stock set up, you might like 400 front and 700 rear as a starting point. Many of the advanced drivers in the VRL are using much stiffer spring rates. Alot will have to do with how hard you drive your car, how much aerodynamic downforce you have, how much your car weighs, how much body roll you are willing to tolerate, the type of tires you use, etc etc.
It's not a bad idea to keep a spring inventory in the range of where you think you will start and end up, say in 50 pound increments. I've actually changed springs as much as three different times at one track event to find the ultimate set up for me.
I think the more you get comfortable with your car, the stiffer you will go until you can't feel the car losing grip before it's too late. Some guys are at over 1000 pounds in both front and rear. Personally, I like to go as soft as possible without having uncomfortable body roll during cornering.
The optimal spring rates will vary with many things such as driver preference, chassis set-up, and your shock valving just to name a few. When you have your shocks valved, they will want to know your spring rates to do a proper job.
If you are coming from a stock set up, you might like 400 front and 700 rear as a starting point. Many of the advanced drivers in the VRL are using much stiffer spring rates. Alot will have to do with how hard you drive your car, how much aerodynamic downforce you have, how much your car weighs, how much body roll you are willing to tolerate, the type of tires you use, etc etc.
It's not a bad idea to keep a spring inventory in the range of where you think you will start and end up, say in 50 pound increments. I've actually changed springs as much as three different times at one track event to find the ultimate set up for me.
I think the more you get comfortable with your car, the stiffer you will go until you can't feel the car losing grip before it's too late. Some guys are at over 1000 pounds in both front and rear. Personally, I like to go as soft as possible without having uncomfortable body roll during cornering.
OP
OP
FrankBarba
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The problem is Stock Shocks...No $$$ to do an upgrade at this time. The rears are 13 1/2" length & 2 1/2 ID. The fronts are
14 3/4" length & 2 1/2 ID. I am again in uncharted territory. Only 1 company that i know of has done what i am trying to accomplish. i could go with adjustable spring perches. (pain in the butt, in my opinion). Or i could have the spring companies make special order spring rates (expensive). I talked with Autoform, Archers shop in MN. The only game in town at the present momment is Eibach Pro Kit. No big difference from stock set up. Will lower the car a hare. I might go to a local spring maker in my town and see what they can do. Ultimatley i will bite the bullet and do an upgrade after the summer.
14 3/4" length & 2 1/2 ID. I am again in uncharted territory. Only 1 company that i know of has done what i am trying to accomplish. i could go with adjustable spring perches. (pain in the butt, in my opinion). Or i could have the spring companies make special order spring rates (expensive). I talked with Autoform, Archers shop in MN. The only game in town at the present momment is Eibach Pro Kit. No big difference from stock set up. Will lower the car a hare. I might go to a local spring maker in my town and see what they can do. Ultimatley i will bite the bullet and do an upgrade after the summer.
Frank Parise
VCA Venom Member
I don't think your stock shocks will work well with stiff springs. The rebound control may not be strong enough to deal with the force of a much stiffer spring.
You will want adjustable spring perches. That's how you adjust the ride heights on the car.
You will want adjustable spring perches. That's how you adjust the ride heights on the car.
