[DeTomaso] some rough numbers re need formula for springs needed-- was shocks for ORR

[pantdino at aol.com]

 Thought I'd run some numbers to see how much one would have to increase spring force if my velocity squared theory is correct:

Since for some reason my equation didn't show properly before, I'll try to show this one differently:

Since kinetic energy increases as the square of the velocity, it seems to me that if you know that a set of springs is adequate at a certain velocity, you can calculate how stiff they would have to be to still be OK at a higher velocity.

(V2 squared / V1 squared) ? x??? spring force which is adequate at V1 =? spring force which is adequate at V2

using this formula, if 700 lbs is adequate at 150mph, then you would have to have 796 lb springs at 160.

At 170 you'd need 899lb springs.

Back solving for what speed 750lb springs are good for yields 155mph.

The multipliers are actually simple:

to go from 150mph to 160, multiply the spring strength by 1.1377
to go from 150mph to 170, multiply the spring strength by 1.284

So if a 750 spring is needed at 150 you'd need 963 lbs at 170.? Anyone know what NASCAR cars run?

Dennis, what exactly are you trying to prevent, the bodywork from hitting the ground or the suspension from hitting the bump stops?

Jim
?




 

-----Original Message-----
From: Mark McWhinney <msm at portata.com>
To: 'Jason Eaton' <jason.eaton at gmail.com>
Cc: 'Mad Dog Antenucci' <teampantera at yahoo.com>; detomaso at realbig.com; JJD1010 at aol.com
Sent: Thu, 11 Oct 2007 9:30 pm
Subject: Re: [DeTomaso] need formula for springs needed-- was shocks for ORR










I am running 750 lbs springs and doing so without seats.  I have driven to
LV.  No problem.

You're all slackers.

Unsubscribe me.

:)


-----Original Message-----
From: Jason Eaton [mailto:jason.eaton at gmail.com] 
Sent: Thursday, October 11, 2007 9:13 PM
To: Mark McWhinney
Cc: Mad Dog Antenucci; JJD1010 at aol.com; detomaso at realbig.com
Subject: Re: [DeTomaso] need formula for springs needed-- was shocks for ORR

I would say that the ride is too rough for the street. Grandma lost
her false teeth and dad hurt his back riding in my car :)

Maybe i'm just getting old.

On 10/11/07, Mark McWhinney <msm at portata.com> wrote:
> A 750 lbs load will compress a 750 lbs spring 1.00 inch.
> A 750 lbs load will compress a 700 lbs spring 1.07 inch.
>
> How good is your butt-o-meter?
>
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
On
> Behalf Of Mad Dog Antenucci
> Sent: Thursday, October 11, 2007 1:10 PM
> To: JJD1010 at aol.com
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] need formula for springs needed-- was shocks for
ORR
>
> Jeff,
>  I'm not a racer and its not a race car! ;-]>
>  Seriously, excellent idea....no one has mentioned that before. Anyone
> noticed a discernable handling change on the street (positive or negative)
> going from 700 to 750 rear springs?
>
>  Dawg
>
> JJD1010 at aol.com wrote:
>  Racers have different equipment and settings depending on the track. Why
> not
> get a second set of springs and shocks to use at Silver state? All you'd
> have to do is align it.
>
> Jeff
> 6559
>
>
>
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