Is there an easy way to calculate unsprung weight for thirdgens or is there a typical ratio or number already out there that is close? I would like to know the unsprung weight for the front end. I just got the front and rear weighed but that still is too bias for helping choose the right springs based on load rate.

Can anyone help?

thanks.

 

I started weighing items. This is how far I got so far... Perhaps Ed can weigh in on the brake ites and give stock weights as well.

Hopefull we can get the total before I tale the car apart again to change springs.

Number Weight Total Notes
Tires 2 25 50 Toyo Proxas RA1
Wheels 2 25 50 Vintage Wheel 17x9.5
A Arms 2 12.5 25 Stock with ball joints + bump stops
Spindle ? ? 0 Modified for Willwood (ask Ed Miller)
Strut Bolts ?
Struts 2 10.5 21 Koni Yello
Brakes w/ Pad ? Willwood (ask Ed Miller)
Rotors ? Corvette C4 13 X1.10
Lug Nuts ?
Springs ?
Tie Rods 1/2 weight

 

Stock front brakes- 10.5" rotors and 1pot Iron DelcoMoraine calipers, spindles, backingplates, & lines. These are worn- (turned down many times and are also drilled so they started out lighter slightly), pads are worn thin also and they weigh in at 39.3lbs. New solid rotors and new pads would be aprox 40-41lbs


SDIF, You also need to factor the weight of the swaybar links and swaybar arm leverage weight on the links.

 

Ok thanks for the info guys, that should give a pretty good estimate if I add in the weight of my wheels.

Being quite new to this stuff though, am I understanding it right that subtracting the front unsprung weight from the front end scale weight will give the weight that the springs are supporting? And that number would be what you compare to the "load rate at installed height" of the new springs?

For example, the car weighed 1780 up front. Say the unsprung weight turns out to be around 220lbs, then 1560 would be the front end weight on the springs. Moog has a spring with a 1530 load rate (at installed height) so that would pretty much give the intended ride height. But going with the Moog spring with a 1405 load rate would lower the ride height a little bit. Do I have that correct???