Spring rate questions.

What length and spring rate should I use on my BBF Futura? Mainly a strip car. What would I need for a street/strip SBF Fox body Mustang?

John i have 14 inch 150# on mine.

We use a 14"175 spring on most our bb stuff and we use a 12"150 on the small block stuff

John I got some I think in 150 and 175 I will make you a deal on I will try and remember to check them tomorrow don't remember if they are 12" or 14"

Thanks for the replies. Let me know what you have and how much use they have. I need to see what I have between my two sets. My buddy has the small block and has some 130 springs but those may be too soft for the street.

The 175 are new just not heavy enough they came with the strang coil over kit I bought I had to get to get a set of 250s for mine

Jeff - what spring is on the back of your Futura?

I base rear spring rate on four things:
1) First gear ration
2) rear weight/total weight
3) tire used
4) what shock is on the rear

My stuff is all super light compared to most recommendations but I'm also going to put you in a badass shock. Spring just holds the car up sitting still and after that it's in the way.

We use anything from #80-#110 on rear

I was under the impression he was looking for front rates.... We also use a 110 rate in the rear depending on weight and gear selection.

I need suggestions for the rear too. Thanks

Justin - What do you guys typically run on the front?

I got a set of 175 14" used and a set of 130 12" used they are QA1. I have a set of 200 14" new but can't find them maybe I will run across them when I clean my shop up.

For bb's we typically stay in the 14-175 range.

rear will be most likely 100-110.  length is stroke dependent.  We like to run the longest shock we can fit.  


As an example we just did a car with 12-150 fronts and 14-80's rear.  1.48 first gear light sb blower car. with an extremely low ride height.

whatbumper wrote:
As an example we just did a car with 12-150 fronts and 14-80's rear.  1.48 first gear light sb blower car.  with an extremely low ride height.

Talk about knocking a head off

John i have afco doubles on the rear with 12-130 springs.

Thanks guys. Much appreciated

I have a chassis Mustang with a BBF that runs 5.20s in the 1/8. it is burying the right rear slick into the ground, twisting the chassis, and pulling the left front tire about a foot or so off the ground. Wish I could post the video on here.

I just purchased a anti-roll for the car.

Anyway, the shocks are Koni and old. Looking at new shocks, any suggestions?

Moodyblues wrote:I have a chassis Mustang with a BBF that runs 5.20s in the 1/8.   it is burying the right rear slick into the ground, twisting the chassis, and pulling the left front tire about a foot or so off the ground.   Wish I could post the video on here.

I just purchased a anti-roll for the car.

Anyway, the shocks are Koni and old.  Looking at new shocks, any suggestions?

I can put a pretty trick valving into an Afco shock. We love the Afco design for most cars. I do like the Santhuffs for some rides but the Afco's fit a broader range with their valving designs.