Z1NONLY

iTrader: (2)

No.

The sway bar changes roll stiffness by trying to make both sides do the same thing. This is an over simplification, but let's say you turn to the right...

The weight of the car will shift to the left and the suspension components on that side will start to compress.

The sway bar will move up and transfer some portion of that same energy to the connection point on the other side of the car.

So if the inside part of the car wants to lift up, it will have to carry some portion of the unsprung weight to do it.

A super-stiff sway bar will force the inside "side" to take all of the unsprung weight, or at least a larg enough portion to unload or even lift the inside tire(s).

On the other hand, a really "loose" bar will let the body roll without taking to much of the unsprung weight with it and the wheel, brakes, and other suspension components will just "sag".

That "droop" will give the inside tire a better chance of getting some load and some traction.

warmmilk

iTrader: (5)

ahh, ok, that makes sense.

thanks

TractionCircle

everyone has said it already, but I'll echo it.....

Tirespin is very common on a race tire equipped Z cause you are unweighting the inside rear tire. The VLSD is not all that quick to go from open to locked, so you get wheelspin. Blown front shocks that make the front roll more will make it worse. I put the stranoparts bar on my car and it made a world of difference. No more wheelspin and it didn't add any understeer. Win win mod.

Opposite effect: At a local autox, the front endlink broke mid run, meaning NO front bar for the run.....rear wheel was off the ground for most of the run. Spotters said over a foot off the ground!

Just my $.02

JR

warmmilk

iTrader: (5)

their sway bar? or do they make some other kind of bar to?

warmmilk

iTrader: (5)

i have another autox coming up this weekend, i'll set the front sway bar one hole stiffer and see if there is a difference...

TractionCircle

He sells it, but it is made by Addco I think. It's the same bar that Carter ran, and the same one that Cavanaugh is now running. It's like $130, but non adjustable. In hindsight, adjustability would have been nice. Perhaps he can get the adjustable version, call Sam and ask him. One of the nicest guys goin...

warmmilk

iTrader: (5)

well i have hotchkis bars front and rear, and i can still go 2 holes stiffer on the front, so i think i'll try that before buying another sway bar.

hopefully this helps till i can get a real lsd...

terrasmak

iTrader: (8)

make sure you go full soft on the rear bar too. The middle setting is way to stiff out back for what your doing

warmmilk

iTrader: (5)

so second from stiffest in front and full soft in rear?

damn, not really looking forward to all the understeer, would i be ok leaving the front as is, and just going to full soft in the rear?

warmmilk

iTrader: (5)

is it more important to add roll stiffness to the front or remove roll stiffness from the rear?

betamotorsports

iTrader: (1)

It sounds like you need a big change to get the wheelspin under control. Go full stiff in front and full soft in back. Then adjust from there (stiffen rear first if needed). Bring tools to the next event and make adjustments between runs.

To reiterate, you will need to really change your driving style to make this work. Brake earlier because the absolute worst thing you can do is come into the corner even a smidgen too fast. And be careful about coming off the brakes too fast. Don't pop off the brake pedal, easy off it and then ease on the gas.

scotts300

iTrader: (46)

Our inside tire spins now. Nissan wont' warranty the LSD - it is failing.

Sounds like an LSD issue. Try this crude test:
-Jack the car up on one rear side
-Leave that side in the air with the other 3 tires on the ground.
-Put the car in gear
-Put a torque wrench on one lugnut and test the break away torque (i.e. the amount of tq it takes to make the wheel spin with the opposing wheel on the ground and the car in gear)
-Report back (I think breakaway tq is about 70#ft)

SOLO-350Z

iTrader: (26)

^^X2. It should only be doing this if the LSD is failing. A new LSD 350Z doesn't show this problem and you shouldn't need to modify any suspension parts.

warmmilk

iTrader: (5)

thanks

braking earlier shouldn't be to much of a problem, i think i brake to much as it is anyway cause i'm scared i'll spin out or i don't think the front will grip enough or lack of brass ***** (i'm still a noob)


so if its under 70#'s, that means my lsd is shot, correct?

scotts300

iTrader: (46)

It would be an indication that it is going bad. Mine turns at like 30#ft on the ZR.

BTW, BEST mod I ever made to my coupe was the NISMO LSD. The grip and power out of turns (in autox) was obvious and amazing.

warmmilk

iTrader: (5)

well i am planning on a better lsd (before i even considered mine was going bad), but i want the quaife lsd. but i wanna do some other upgrades (bbk and oil cooler) that i think will provide more benefit to me... the diff will have to wait till late this year or early next year...

dnguyent

iTrader: (5)

If you mostly or exclusively do autoX, I'd think the lsd would serve you better than the bbk and oil cooler (both of which are recommended for DE's).

scotts300

iTrader: (46)

1000x

warmmilk

iTrader: (5)

right now, i mostly do autox cause i don't have a bbk or an oil cooler, i'll start doing track days also once i get the those items

i did a couple of track days on the stock brakes (non brembo) with project mu b force pads and fresh motul fluid, and the fade was pretty bad. pedal got really soft and would hit the floor, and i can feel my stopping distance increase with each lap...

dnguyent

iTrader: (5)

In that case, yes, BBK would be a good priority. Those Project Mu B Force pads are not race pads, so it's not surprising that you had fade with them. I'm thinking they work as well as Hawk HPS, and those do not hold up at all to track work. I have an oil cooler, but since I never installed a thermostat, I don't know how much improvement there is. All I know is that power loss without the cooler was more noticeable...but, I still notice some power loss on 95F+ days and in the latter half of a 25min session.

As for lap times, the LSD really came into play in the slow, sharp corners (stock power). On the track, it may reduce my lap times by 1 second or so, but I imagine that the benefits on an autoX course would be more substantial.