BD Race Springs - Rear Rate

[mln385]

Originally Posted by Grey 65

I can confirm the stock rates are 215lbs front and 450lbs rear. I had mine tested at Vorshlag Motorsports in Plano, Texas...

I am putting 450lb fronts and 650lb rears on my car.

Kevin.....

That is quite an increase no. How do you think it will re act with those rates?

[Grey 65]

Originally Posted by mln385

That is quite an increase no. How do you think it will re act with those rates?

It will be fine. The 450lbs in the front is what the math says you should run for racing. The rear should be right at 900lbs-950lbs. But I wanted a little softer so I went with 650lbs since I drive on the street in addition to autocrossing.

There are no real struts for this setup. The closest is the BDR TD front struts which I bought and a pair of Bilstein rears which I also bought... Otherwise you have to have a special set of one offs made.

Kevin.....

[cbreez]

Please explain your "math" that you used for determining racing spring rates. We all would love to know...

[Grey 65]

Originally Posted by cbreez

Please explain your "math" that you used for determining racing spring rates. We all would love to know...

The lead engineer at Vorshlag Motorsports took the dim's and weights off of my car and figured it out. It is kind of his full time job....

If you took the time to read what I wrote you would see that I said "Vorshlag Motorsports".

Kevin.....

[cbreez]

I did read the post...you still haven't explained anything to all.

I think that what you portray is wrong regarding a recommended spring rate so explain it to us how that was determined other than that somebody told you something, I would like to learn...

There are many variables in determining spring rates for racing, street, autocrossing, etc.

BTW, before you convince everyone that rock hard springs are the answer to handling, which they are not, most racing folk adjust with sway bars first...

[Grey 65]

Originally Posted by cbreez

I did read the post...you still haven't explained anything to all.

I think that what you portray is wrong regarding a recommended spring rate so explain it to us how that was determined other than that somebody told you something, I would like to learn...

If you would like to learn you can get a job at Vorshlag sweeping the floors, then they will eventually let you work on the cars and at that point the lead engineer will give you the time of day and explain things to you. Or you can go get an engineering degree or you can just do like most of us and go pay a race engineer to figure it out for you. I don’t ask the doctor why he gives me such and such medicine to take, nor do I ask the engineer why the numbers are what they are. I give him the car and I tell him how I want to use it. He then determines what the best spring rates are for what I want to do.

Originally Posted by cbreez

There are many variables in determining spring rates for racing, street, autocrossing, etc.

You should spend more time on reading comprehension. The original OP was looking for stiffer rates for AUTOCROSSING. I said in my posts that I AUTOCROSS. I would deduct that the proper rates quoted to me by Vorshlag Motorsports were for AUTOCROSSING and not waterskiing.

Originally Posted by cbreez

BTW, before you convince everyone that rock hard springs are the answer to handling, which they are not, most racing folk adjust with sway bars first...

FYI: You tune for the particular track or conditions with swaybar changes or swaybar adjustments. That is once you have the proper spring rates for the type of racing you participate in and you fine tune with air pressure adjustments.

Kevin.....

[cbreez]

Originally Posted by Grey 65

If you would like to learn you can get a job at Vorshlag sweeping the floors, then they will eventually let you work on the cars and at that point the lead engineer will give you the time of day and explain things to you. Or you can go get an engineering degree or you can just do like most of us and go pay a race engineer to figure it out for you.




.

I see, you are here on this forum preaching but you really don't know how it works...Most folk here would like to learn how things work. BTW, I was just playing with you...I know how things works regarding springs, shocks, etc. it's just funny to see you profess your "knowledge".

Good that you have your guru!

[Steve Gallegos]

I have a set of front performance spring for my BD, they are 250lbs. stock are 215lbs. I want to go back to the stock springs. These are about 9 months old. Anyone want to trade. It would have to be a newer car and I need the mounting cups with them. Mine come with the mounting cups.