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Strut spring rate ?
http://motorsportsvillage.com/forum/viewtopic.php?f=8&t=9659
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Author:  jmech [ Tue Oct 16, 2012 3:17 pm ]
Post subject:  Strut spring rate ?

I'm building a 2x3 strut chassis for my 69 Chevelle with Strange struts. It has a glass front end with steel shell and aluminum interior. Aluminum head tall deck big block and glide. What front spring rate would i need ?

Author:  Ken0069 [ Tue Oct 16, 2012 4:44 pm ]
Post subject:  Re: Strut spring rate ?

I'll bet if you called Strange and asked them they would be more than happy to tell you what you need. Not saying that someone here couldn't do that mind you, just that getting it from someone that does it every day might be a better.

Author:  gearhead1011 [ Tue Oct 16, 2012 4:47 pm ]
Post subject:  Re: Strut spring rate ?

You will need to know how much weight it's going to have on the front or at least a pretty close guess.

Author:  Ken0069 [ Tue Oct 16, 2012 5:25 pm ]
Post subject:  Re: Strut spring rate ?

I was thinking that they're going to have to make a "best guess" at that spring rate and if I'm not mistaken, they will swap springs with him if what they recommend doesn't work. That way he only has to buy one pair.

But to be honest, I'm wondering why he's horking with a car that he's winning with??? O:)

Oh yeah, but I forgot. If it ain't broke, then he can still probably fix it! ;-)

Author:  jmech [ Tue Oct 16, 2012 5:45 pm ]
Post subject:  Re: Strut spring rate ?

I'll call Strange and see what they say. I'm running a Hilborn stack injection next year and i want the motor farther back so the stacks are at the windshield. I figured i'm cutting stuff up anyway to move the motor back i might as well do the whole front chassis. I'd like to be mid 8's with the car next year. With the 2 or 300 lbs i'm taking off and about 100 more hp it should be there. Best this year was 9.17 at 148mph. Its a long winter here in the north =;

Author:  Beretta [ Tue Oct 16, 2012 5:46 pm ]
Post subject:  Re: Strut spring rate ?

..............300............

Author:  Ken0069 [ Tue Oct 16, 2012 9:10 pm ]
Post subject:  Re: Strut spring rate ?

Beretta wrote:
..............300............


Yeah Barry, I was thinking that too. :-k

Author:  jmech [ Tue Oct 16, 2012 10:00 pm ]
Post subject:  Re: Strut spring rate ?

Thanks guys. I'm ordering struts soon so i just need a starting point. Its no big deal if i need to exchange the springs later. 300lbs sounds good to me too.

Author:  Beretta [ Wed Oct 17, 2012 5:56 am ]
Post subject:  Re: Strut spring rate ?

JFYI, Struts are not going to like those big wheel stands O:)
Also something else to consider is if your car needs to be "up on the back tire" You may have to put a lighter
spring so you can store energy in them by compressing them so you can get some lift. Just be careful that
you don't get coil bind when compressed...

I have a few sets of hyper coil springs laying around so let me know if you want to try something different as you may
not know till you run the car down the track..

Also like Chuck said if you can scale the car before you get into it that will give you a better idea of what you may need and if it were me I would go one lighter that what it works out to be as both the Vega and my Beretta I had to go one lighter on the spring...Also IMO that the Strange struts always seem to be to stiff even on the softest setting and I think Chuck will agree.

Author:  jmech [ Wed Oct 17, 2012 7:12 pm ]
Post subject:  Re: Strut spring rate ?

Ya i know i can't do wheelies anymore =P~ . I had the front tied down all season for the pro tree so the wheelie day's are over anyway. I ordered the struts today from AutoFab, very nice to deal with and the best price i could find. PSS120 with HD brakes 1749.00 and only 36.00 fraight. They suggested 325lb springs so thats what i'll try. Thanks for the offer to try some different spring rates. It'll be 8 months till racing starts again, i doubt i'll remember, but thanks anyway.

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