Changes to Stock Rules in SOLO

Tubro · 10-21-2011, 06:34 PM

Either front or rear sway bar can be changed now in Stock class. What are the implications for the 370? Improved turn-in? Think it makes the car more competitive?

SEB 9/28/11:

ITEM 10) Change 13.7 to read as follows: “13.7 ANTI-ROLL (SWAY) BARS
A. Substitution, addition, or removal of a single anti-roll bar and supporting hardware (brackets, end links, bushings, etc.) is permitted.
B. Substitution, addition, or removal of an anti-roll bar may serve no other purpose than that of an anti-roll bar. C. The use of any bushing material is permitted. A bushing may be implemented as a bearing. D. No modification to the body, frame, or other components to accommodate anti-roll bar addition or substitution
is allowed except for the drilling of holes for mounting bolts. Non-standard lateral members which connect
between the brackets for the bar are not permitted.

http://www.scca.com:8080/assets/11-f...k-nov-solo.pdf

cossie1600 · 10-21-2011, 07:33 PM

Rear sway isn't going to help the car much. If anything, the inner wheel lift is going to be much worse

Tubro · 10-21-2011, 07:50 PM

What if you put an adjustable sway in the rear that was less stiff that stock, would it help keep the inside tire planted while not inducing understeer?

cossie1600 · 10-21-2011, 07:59 PM

I am not an expert on sway bars, but I believe you would add so much suspension roll that it probably won't help.

Skeeterbop · 10-21-2011, 08:09 PM

Theoretically If you put a softer bar in the rear or firmer bar in front you are going to get more understeer. Firmer rear or softer front would give you the opposite effect. What that means for the Z i have no clue since i have yet to take it out for autocross.

spearfish25 · 10-22-2011, 01:42 PM

Sway bars make much less of a difference in autocross than the rule book would suggest. Franky, your driving is going to make a much bigger time difference than your sway bar stiffness or settings. Unless you're extremely skilled and competitive, don't worry about it and just focus on improving your lines, braking and momentum.

takjak2 · 10-23-2011, 04:55 PM

I don't see sway bars doing much for the Z34 in stock, but what I wonder about is the new ASP.

cossie1600 · 10-23-2011, 06:58 PM

It helps to put power to the ground, especially when you have giant slicks

ihatepotholes · 10-23-2011, 09:34 PM

generally speaking thicker and stiffer sway in the rear will help the under steering. however, oversteering is much harder to correct.

Tubro · 10-23-2011, 10:26 PM

In Stock class with a square set up (which is what is sounds like people run) does the Z35 really understeer? Is it something that requires correction with a (rear) sway?

ihatepotholes · 10-23-2011, 10:34 PM

Quote:

Originally Posted by Tubro

In Stock class with a square set up (which is what is sounds like people run) does the Z35 really understeer? Is it something that requires correction with a (rear) sway?

z34? i find it understeers just a tad. i do not think it requires correction with a rear sway. but that's just my preference, i prefer a tad understeer, it's more predictable that way.

cossie1600 · 10-23-2011, 11:48 PM

Quote:

Originally Posted by Tubro

In Stock class with a square set up (which is what is sounds like people run) does the Z35 really understeer? Is it something that requires correction with a (rear) sway?

Front bar is still more useful than the rear on the Z

Red__Zed · 10-23-2011, 11:52 PM

rear bar is huge for making the car more neutral. wish this had been in place before.

Shamu · 10-24-2011, 12:33 AM

Quote:

Originally Posted by cossie1600

Front bar is still more useful than the rear on the Z

Absolutely. I had huge improvement with car when I went to 35 mm front bar. My car doesn't understeer but it puts power down much better.

Tubro · 10-24-2011, 09:10 AM

Sorry definitely meant Z34.

When you guys talk about how much the front sway helps, are you talking about specifically with R comps? Is there a tradeoff wherein the front sway induces noticable understeer during 'spirited' driving on normal tires while not at the track/autocross?

10-21-2011, 06:34 PM	#1 (permalink)
Tubro Base Member Join Date: Jul 2011 Location: Denver Posts: 67 Drives: 2012 Z34 base+sport Rep Power: 14	Changes to Stock Rules in SOLO Either front or rear sway bar can be changed now in Stock class. What are the implications for the 370? Improved turn-in? Think it makes the car more competitive? SEB 9/28/11: ITEM 10) Change 13.7 to read as follows: “13.7 ANTI-ROLL (SWAY) BARS A. Substitution, addition, or removal of a single anti-roll bar and supporting hardware (brackets, end links, bushings, etc.) is permitted. B. Substitution, addition, or removal of an anti-roll bar may serve no other purpose than that of an anti-roll bar. C. The use of any bushing material is permitted. A bushing may be implemented as a bearing. D. No modification to the body, frame, or other components to accommodate anti-roll bar addition or substitution is allowed except for the drilling of holes for mounting bolts. Non-standard lateral members which connect between the brackets for the bar are not permitted. http://www.scca.com:8080/assets/11-f...k-nov-solo.pdf

10-21-2011, 08:09 PM	#5 (permalink)
Skeeterbop A True Z Fanatic Join Date: Jan 2011 Location: Fort Bliss, TX Age: 40 Posts: 1,440 Drives: 2011 GM 370 base SP Rep Power: 16	Theoretically If you put a softer bar in the rear or firmer bar in front you are going to get more understeer. Firmer rear or softer front would give you the opposite effect. What that means for the Z i have no clue since i have yet to take it out for autocross. __________________ Srenity: "Yeah no rest needed to spread the love when your 20 that's for sure...."

10-22-2011, 01:42 PM	#6 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Sway bars make much less of a difference in autocross than the rule book would suggest. Franky, your driving is going to make a much bigger time difference than your sway bar stiffness or settings. Unless you're extremely skilled and competitive, don't worry about it and just focus on improving your lines, braking and momentum. __________________ 2013 Cadillac V-Wagon, RIP Z

10-23-2011, 04:55 PM	#7 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	I don't see sway bars doing much for the Z34 in stock, but what I wonder about is the new ASP. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

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10-21-2011, 07:33 PM	#2 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	Rear sway isn't going to help the car much. If anything, the inner wheel lift is going to be much worse

10-21-2011, 07:50 PM	#3 (permalink)
Tubro Base Member Join Date: Jul 2011 Location: Denver Posts: 67 Drives: 2012 Z34 base+sport Rep Power: 14	What if you put an adjustable sway in the rear that was less stiff that stock, would it help keep the inside tire planted while not inducing understeer?

10-21-2011, 07:59 PM	#4 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	I am not an expert on sway bars, but I believe you would add so much suspension roll that it probably won't help.

10-23-2011, 06:58 PM	#8 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	It helps to put power to the ground, especially when you have giant slicks

10-23-2011, 09:34 PM	#9 (permalink)
ihatepotholes Base Member Join Date: Jan 2010 Location: nj Posts: 129 Drives: 2012 Boss 302 Rep Power: 15	generally speaking thicker and stiffer sway in the rear will help the under steering. however, oversteering is much harder to correct.

10-23-2011, 10:26 PM	#10 (permalink)
Tubro Base Member Join Date: Jul 2011 Location: Denver Posts: 67 Drives: 2012 Z34 base+sport Rep Power: 14	In Stock class with a square set up (which is what is sounds like people run) does the Z35 really understeer? Is it something that requires correction with a (rear) sway?

10-23-2011, 11:52 PM	#13 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	rear bar is huge for making the car more neutral. wish this had been in place before.

10-24-2011, 09:10 AM	#15 (permalink)
Tubro Base Member Join Date: Jul 2011 Location: Denver Posts: 67 Drives: 2012 Z34 base+sport Rep Power: 14	Sorry definitely meant Z34. When you guys talk about how much the front sway helps, are you talking about specifically with R comps? Is there a tradeoff wherein the front sway induces noticable understeer during 'spirited' driving on normal tires while not at the track/autocross?