Spring ratios

Technical questions relating to your wheels, brakes, suspension and steering
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Asroc66
Posts: 428
Joined: Tue Jun 18, 2013 5:09 am
Car(s): PR91 1967 GT, PR20 1966 1/2 with GT Goodies
Location: Sydney NSW

Spring ratios

Post by Asroc66 »

Hi All
Wondering what the ratio is for rear springs
By that I mean
If you lower rear springs by 1 inch does it lower the ride height by 2 inches?
Ie ratio 1:2
Thanks
J

To increase the fun, add a hair dryer
PR91
Posts: 2521
Joined: Tue Sep 16, 2008 11:54 am

Re: Spring ratios

Post by PR91 »

Measure it.
Pull it apart.
Pull out the upper and lower spring rubbers.
Put it back together.
Measure it again and measure the rubber thickness.
Divide the difference in ride height by the rubber thickness.....
Theres your ratio.

I've always worked out my installed height and spring rate needed and had them made to suit.
Is exactly what the race car has.

Read your sway bar question too and replied.
User avatar
Asroc66
Posts: 428
Joined: Tue Jun 18, 2013 5:09 am
Car(s): PR91 1967 GT, PR20 1966 1/2 with GT Goodies
Location: Sydney NSW

Re: Spring ratios

Post by Asroc66 »

Thanks PR91
on both accounts
Cheers
J

To increase the fun, add a hair dryer
User avatar
Asroc66
Posts: 428
Joined: Tue Jun 18, 2013 5:09 am
Car(s): PR91 1967 GT, PR20 1966 1/2 with GT Goodies
Location: Sydney NSW

Re: Spring ratios

Post by Asroc66 »

In case anyone interested
Lower rear springs by 25mm translates to about 35-40mn ride height
In old language
1 inch lower springs drops ride height by 1 1/4 - 1 1/2 inches
Cheers
J

To increase the fun, add a hair dryer
Gunna

Re: Spring ratios

Post by Gunna »

Always interested.

And thx again for sharing.

Dean
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