WildScotsRacing
WildScotsRacing Dork
10/15/17 6:48 p.m.

Millennium Escort is driving again, sans 90 lbs off the front end that isn't going back on. It is enough weight that the front ride height is a solid 1/4 inch to 5/16 inch higher. It seems to me, that usually removing weight from a spring results in a higher effective spring rate, yielding a harsher ride. So, why is the front ride slightly smoother now?

Streetwiseguy
Streetwiseguy UltimaDork
10/15/17 7:07 p.m.

More suspension travel?  We're you hitting bumpstops before?

mad_machine
mad_machine MegaDork
10/15/17 7:20 p.m.

less hobby horsing from weight on the ends?

Ian F
Ian F MegaDork
10/15/17 7:34 p.m.

Suspension can absorb the bumps more than supporting weight.

WildScotsRacing
WildScotsRacing Dork
10/15/17 8:31 p.m.
Ian F said:

Suspension can absorb the bumps more than supporting weight.

That was my assumption. Guessing that the shock damping curves must be working a little better because of it. I feel like there's suspension tuning lesson in there somewhere.

mad_machine
mad_machine MegaDork
10/15/17 9:56 p.m.

just out of curiosity, how worn are the struts?

nutherjrfan
nutherjrfan Dork
10/15/17 10:21 p.m.

How scary at speed? smiley

Trackmouse
Trackmouse SuperDork
10/15/17 10:32 p.m.

How much frontal lift under hard acceleration?

WildScotsRacing
WildScotsRacing Dork
10/15/17 11:30 p.m.

In reply to mad_machine :

Only 3500 miles, no leaks, still has gas pressure.

WildScotsRacing
WildScotsRacing Dork
10/15/17 11:47 p.m.
nutherjrfan said:

How scary at speed? smiley

Rock steady at 120mph (will not divulge details due discovery not being made at sanctioned event wink)

WildScotsRacing
WildScotsRacing Dork
10/15/17 11:48 p.m.
Trackmouse said:

How much frontal lift under hard acceleration?

Not enough to matter, OEM anti-lift geometry still in effect. 

wvumtnbkr
wvumtnbkr UltraDork
10/16/17 4:04 a.m.

Spring rate doesn't change based on weight on the spring.

 

I think I know what you are referring to.  Sort of like how an hd truck rides better with some weight in it.

 

WildScotsRacing
WildScotsRacing Dork
10/16/17 5:49 a.m.
wvumtnbkr said:

Spring rate doesn't change based on weight on the spring.

 

I think I know what you are referring to.  Sort of like how an hd truck rides better with some weight in it.

 

Exactly. I should have put the word "effective" in quotes.

GameboyRMH
GameboyRMH MegaDork
10/16/17 8:20 a.m.

Sounds like the car was either undersprung or underdamped. Lightening the car has a similar effect to raising spring rates in terms of suspension travel, and if your shocks were too soft before, you just gave them less work to do, so they're now better able to control body motion. An underdamped car will feel very light and bouncy, not exactly in a good way.

Appleseed
Appleseed MegaDork
10/16/17 9:33 a.m.

Harmonics? Maybe the natural resonance has changed?

WildScotsRacing
WildScotsRacing Dork
10/16/17 3:36 p.m.
GameboyRMH said:

Sounds like the car was either undersprung or underdamped. Lightening the car has a similar effect to raising spring rates in terms of suspension travel, and if your shocks were too soft before, you just gave them less work to do, so they're now better able to control body motion. An underdamped car will feel very light and bouncy, not exactly in a good way.

I'm going to go with under-damped. Spring rate is around 300 F/R.

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