Soft left rear

[fuzzyfoamrace]

Can someone explain the theory of this? I'm brand new to bar cars and late models. We always had a much stiffer left rear on our sportsman , super stock stuff.

Any help is much appreciated and keep it simple. Thanks

[LRtireCHANGER]

A softer lr spring will store more energy than a heavier spring, allowing the softer spring to drive the lr suspension down further before the spring unload. http://jetracinginc.com/images/stories/SetupManual5914_3.pdf Go read this setup manual, it gives on of the best explanations of how a four bar car works that I have seen.

[LRtireCHANGER]

Some of the pages are corrupted, start at page 19.

[MasterSbilt_Racer]

A softer spring unloads more slowly with roll. It continues to push on the car after a stiff one would be unloaded.

[Krooser]

Wouldnt a heavy spring act like a softer spring if there's more weight on that corner?

[fastford]

yep , as long as it never leaves the spring seat.....

[fuzzyfoamrace]

Ok, still confused after the heavy spring never leaving the seat reply. I get what hes saying but that goes back to running a heavy lr like the super stock cars.

If when chain is at its limit for lr droop, does it make a difference if you run a 14 vs 16 spring if they both stay loaded on spring seats

[MasterSbilt_Racer]

Ok, still confused after the heavy spring never leaving the seat reply. I get what hes saying but that goes back to running a heavy lr like the super stock cars.

If when chain is at its limit for lr droop, does it make a difference if you run a 14 vs 16 spring if they both stay loaded on spring seats

Nope. A taller spring compresses more before coil bind. That is all.

[fast_crew]

It's pretty simple, a 200lb spring with 600lbs on it is compressed about 3". A 100lb spring with that same 600lb load is compressed 6"... If LR hikes up 4".... well you get the idea.

[fastford]

good example fast-crew , this is also what brought about the stacked left rear , you can achieve that soft rate and travel with out coil bind......

[Matt49]

A softer LR spring promotes more LR hike given the same lateral weight transfer. If you transfer 400 pounds off of a compressed 200 pound spring, it will extend 2 inches. If you transfer 400 pounds off of a compressed 100 pound spring, it will extend 4 inches, thereby giving you more hike for a given transfer amount. Obviously we limit travel but what happens and how fast it happens between the lowest point of the LR on corner entry and where it is limited are pretty important.