do whiteline springs cause oversteer?

[grip_racer]

ive noticed that these springs (rears) progress to a higher rate than the fronts when pushed.

does this correct the 240's understeer or does it just make the car oversteer a bunch?

someone who has them tell me what they handle like please.

and post a pic of your car if you could.

[aither]

I've been in a car that auto-x'd with them a few times. Definitely no signs of oversteer. I wouldn't worry about it, and if it does come up, you can always correct for it..

[MYK]

mine is pretty neutral. I'm running whitelines with AGX's. How I set the shocks really changes the car though. At the last autox I played with the settings a bit to see what the car would do. On my first run, with my Falkens at 44psi front and rear I had the AGX's all the way up front and back. 4 on front, 8 in the back. the rear end was all over the place! I could barely keep it from coming around on every little turn. Next and remaining runs I turned the shocks down a couple turns in the rear and I could get the rear end to come around but it was controllable. On the street I'm running the shocks at like 2 and 2 or 3 in the back. Car sticks, and if anything will push a bit unless you're really on the throttle in a turn. Nice and safe on the street. here's a couple pics of my car on the whitelines. AGX adjustables and wheels are Kosei K1's, 16x7.5 et22, falken azenis 205/55-16's.



myk

[Nismo_Freak]

They are made to provide neutral handling under light and heavy load on the suspension. Since the sways are tuned from the factory to provide the understeer at the limit the additional rear rate in the whiteline spring when compressed (read: high load) helps to neutralize this effect.

[Q45tech]

In theory, the spring rate ratio as measured at the wheels [wheel rate ratio] should be equal to the weight distribution ratio.

Nissan tends to make the front springs 15-20% stiffer than the rear even though theory says 5% would be idea......thus part of built in understeer.

A progressive stiffening of front sway bar as bushings compress adds to understeer bias.

The exact spring ratio depends on wheelbase length and tuning speed for highway.......distance at speed [time] between road seams or the undulations caused by the asphalt laying machine.

When you stiffen springs the tuning speed goes up so what was a body weight match at 60 mph goes to 70-80-90-150 mph roughly based on % of increased stiffness.

Why you get pitching and pogoing at highway speed after a spring change........shocks tend to partial mask this effect till they wear.

Obviously things change as the interior/exterior weight changes [full vs empty fuel, trunk passenger loads, drivers weight vs ideal.

The lighter the cars weight the more noticable weight changes are and spring changes have serious effects on light cars.

Progressive rear springs are the worst for nonpredictibilty as they may be softer than oem in the first inch and twice as stiff in the 3-4" compresion ranges.

You must control progressives with a very stiff rear sway bar to avoid the ultra stiff point or suffer the sudden snap oversteer.......tricky to get everything just right.

I know since I have been running Eibach progressive rears for 8 years.

If you have a choice avoid them for a linear setup, life will be so much easier to tune.