Rear Sway Bar For G35 Coupe?

[Takumi]

Does anyone know where I can find a rear sway bar for a G35 coupe? I'd prefer NISMO, I'm pretty sure that they make one for the CPV35, but I'd really appreicate any information.

[PalmerWMD]

Takumi:Welcome to NICO!

For performance parts try some of our sponsors with the banners on the left.

Grubbs has a large performance section and so does Pinnacle.

But all of them are worth your time to check out.

Fred....

[jtesensky]

Try us here:Everything G35.com

We also carry the Stillen sways:

Stillen Sways

-Joe

[rydwhite]

Has anyone here installed any sway bars yet on their G? I am curious as to your opinions on whether or not it really makes that big of a difference.

[elwesso]

IMO the bar would have to be really big in order to make much differece.. AT LEAST 20mm with urethene bushings. The G seems very stable...

[elwesso]

The stillen bar is about 22ish mm (7/8, looked at my ruler and took a guess), and that may make a little difference.

What kind of bar does the G have stock?

[Q45tech]

22ish is roughly 80 lb/inch at the wheel [obviously width, arm length and convolutions can vary this by +-25%].

Since the rear spring stiffness effective at the wheel is roughly 100 inch pounds...........getting near the prudent design limit.

Remember on street cars sway bars are not really used to reduce sway much, just used to tune the roll couple stiffness ratio to more neutral in dry conditions.

[Gsedan35]

Since the rear spring stiffness effective at the wheel is roughly 100 inch pounds...........getting near the prudent design limit.

To be exact it's 123lbs

100lbs would equal a .2923976 motion rate

Front is 248lbs

[Gsedan35]

Sway bars should only be used to fix handling balance issue's, to fine tune the car to your style so that you can extract the most performance that you are capible of getting out of said car. A rear bar only is not the way to go to improve these car's in a meaningfull manner. If you just have to do it, get the EVO350 rear bar as it can be set to very mild stiffness increases. As a example:

The OEM rear bars torsional deflection rate is 380 lbs/in

The 350EVO rear bar in each of it's 3 possible settingsSoft 370 lbs/inmiddle 475 lbs/instiff 580lbs/inORsoft -8% softermiddle +11% stifferstiff +33% stiffer

Best thing to do is to get a adjustable front and rear set of sway bars, Hotchkis ($250) Eibach ($319) or 350EVO ($360) install them mildly set. Then do the testing described below and adjust them as needed.http://forums.freshalloy.com/u...=5&o=

Adjustable bars are NOT just to do with racing or autocrossing and everything to do with allowing you to take full advantage of why you choose to add sway bars in the first place. Even if you install them and never adjust them more then once, they allow you to set the car up better the first time around and to make changes when you need to.

I do not support rear bar only moding on these cars.

One could dig a lot deeper on the topic in general, but that would be pointless overkill.

[Q45tech]

You gave the bar [stand alone stiffness] but not the as mounted and coupled to the suspension rate.The motion factor appears to be [divide by 4?].......Do you have real measured wheel rates for bar and springs? Are you saying the springs alone front couple roll stiffness is : 123 +248= 371............248/371=66.85% seems high considering the front bar.

Normally for pitch control Nissan uses spring WHEEL rates more closely approximating the front to rear weight ratio then trims with bars to avoid neutral in wet power on

[canton_g35]

I installed my nismo sways myself.

they definatly improve the handle of the G. while the body roll was minimal before, my G stays even flatter through the turns.

and when I push it to induce oversteer it comes on nice and smooth. before it felt kind of violent.

oh and if you're in the GA area I work for parts.

[Q45tech]

Sway bars are really not designed to reduce sway [a significant amount].... That's the spring's job!You get too much oscillation in aburpt manuevers when the bars get much above half the spring stiffness because the shocks are not stiffened to control the bar.

After measuring the bars couple point distance [ratio of where bar attaches to arm full length to hub] it appears the 4:1 ratio was optimistic it is more like 5:1: SO

""The 350EVO rear bar in each of it's 3 possible settingsSoft 370 lbs/in ........../5= 74 lb/in at the wheel hubmiddle 475 lbs/in......./5= 95 lb/instiff 580lbs/in............/5= 116 lb/inORsoft -8% softermiddle +11% stifferstiff +33% stiffer"""""""""

So it appear that the oem bar [corrected for coupling to the hub] is ~~~ 84 lb/in or ~~1/3 less stiff than the springs [after the springs are corrected for their offset and motion ratio].

The stock rear bar is pretty aggressive for a factory design! The 350EVO middle or 11% stiffer point would be a good place to start.

No need to change front bar with such a small increase as the bar plus the spring [95 +120] means a total stiffness increase of 5%.......Wheras the stiff setting of the bar would yield a 15-16% total rear stiffness increase and might warrant a wider and softer rear tire.

Unfortunately the bars manufacturers do most of their design work on computers and guess at appropriate values [from experience].........[-8%, +11%, & +33%] what happened to +22%?