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 Post subject: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 3:17 pm 
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Joined: Tue Jun 10, 2008 1:27 pm
Posts: 213
Location: Letellier MB Canada
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 ?

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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 4:44 pm 
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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.


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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 4:47 pm 
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Joined: Wed Apr 19, 2006 4:11 pm
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Location: Shepherdsville, KY
You will need to know how much weight it's going to have on the front or at least a pretty close guess.

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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 5:25 pm 
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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! ;-)


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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 5:45 pm 
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Joined: Tue Jun 10, 2008 1:27 pm
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Location: Letellier MB Canada
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 =;

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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 5:46 pm 
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Joined: Wed Apr 19, 2006 8:20 pm
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Location: N.J.
..............300............

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running E85
Best ET 8.07
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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 9:10 pm 
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Beretta wrote:
..............300............


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


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 Post subject: Re: Strut spring rate ?
 Post Posted: Tue Oct 16, 2012 10:00 pm 
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Location: Letellier MB Canada
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.

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 Post subject: Re: Strut spring rate ?
 Post Posted: Wed Oct 17, 2012 5:56 am 
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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.

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 Post subject: Re: Strut spring rate ?
 Post Posted: Wed Oct 17, 2012 7:12 pm 
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Joined: Tue Jun 10, 2008 1:27 pm
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Location: Letellier MB Canada
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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