Spring rate help?

martin82 · 08-19-2014, 12:43 AM

And on hankook rs3

wstar · 08-19-2014, 11:16 AM

You'll see mentioned by some (I forget if it was mentioned in this thread) that in theory swaybars shouldn't be necessary on a perfect racecar. You'd just set the springs and dampers correctly to avoid the worst of the body roll, and you don't want the swaybar doing other possibly-negative unrelated things. The reason swaybars make so much sense on a production car in general is that springs which are hard enough to kill significant amounts of body roll are going to be way too hard for normal use, so the swaybar is making up for lack of spring in one particular area: body roll.

But then again, even on some dedicated racecar designs that aren't based on production cars, you see some version of a roll bar on one or both ends of the car. It does have its purpose in fine-tuning sometimes. It's usually not nearly as dramatic in spring rate as a production-car rollbar, though. But yes, on our car you apparently just can't ever adequately kill the roll in the front, so you need both stiff springs and a stiff bar up there to help bring it under control.

Zoren 370 · 08-19-2014, 03:36 PM

Thanks guys I wish I have all your technical knowledge is setting our Z.
But Im learning a lot from this tread.

Dwnshift · 08-19-2014, 07:38 PM

Here is another bit... If you dont have adjustable front arms... You will need BAR.

There isnt a lot of grip on the sidewall of any tire.
Just sayin.

Sent from my iPhone using Tapatalk

FL 4Motion · 08-19-2014, 07:56 PM

Quote:

Originally Posted by Dwnshift

Here is another bit... If you dont have adjustable front arms... You will need BAR.

There isnt a lot of grip on the sidewall of any tire.
Just sayin.

Sent from my iPhone using Tapatalk

The outside blocks on the drivers side front tire are toast after Roebling. Very outside edge is just worn completely.

wstar · 08-20-2014, 04:12 AM

Quote:

Originally Posted by FL 4Motion

The outside blocks on the drivers side front tire are toast after Roebling. Very outside edge is just worn completely.

Yeah I had that problem for a while too, I'd just destroy the outsides of the front tires while leaving the inner tread looking new. More front camber! (and caster if you can)

Shamu · 08-20-2014, 01:51 PM

Quote:

Originally Posted by Dwnshift

Here is another bit... If you dont have adjustable front arms... You will need BAR.

There isnt a lot of grip on the sidewall of any tire.
Just sayin.

Sent from my iPhone using Tapatalk

Thats the truth. Im loving my SPL front arms! No specific race slick setup tips for us (spring rates used, bar sizes, alignment settings?)

martin82 · 08-19-2014, 07:59 PM

worth downgrading to 18's just because of saving the $$ on tires alone, for example rs3's in 18's my hook up is under $900 but a set of 19's it's close to 1200. So after about 4 set of tires your savings is exactly 1 set of nt03 enkei 18x.5 wheels.

FL 4Motion · 08-19-2014, 08:34 PM

Quote:

Originally Posted by martin82

worth downgrading to 18's just because of saving the $$ on tires alone, for example rs3's in 18's my hook up is under $900 but a set of 19's it's close to 1200. So after about 4 set of tires your savings is exactly 1 set of nt03 enkei 18x.5 wheels.

I priced the square 18 set up compared to my current 19 setup and it's no cheaper really on tire rack. Going to 275/35/19 up front might change that but I don't have a "hook up" on tires so I'm paying retail.

At this point even though I know 18 are "better" for the track I'm not going that way yet.

martin82 · 08-19-2014, 08:40 PM

well shoot me a message, I dont pay ANYTHING retail LOL

GSS138 · 08-19-2014, 08:58 PM

Yeah I didn't even understand why martin liked the damn KW, and he didn't understand why I hated it, and then I told him it's the colors, and then he said "Lakers Bro". And then it made sense to me.

18's are the way to go for affordability in tires. The price is honestly 100's of dollars difference as martin pointed out and there are many more options with a 18" wheel. It also improves your acceleration as the drag strip guys know. I run 19" Foose "Bling Chrome" wheels on street 1 because they look nice, but 2 I would be at a disadvantage on track. If you want to see the real problem browse the GTR forums where they all have 20" wheels. There are no tire options for those guys besides the toyo R888. They have one friggin tire option in that size. (maybe soon they will have the NT01)

With an 18" wheels your tire options are 10 fold at least.

And yes, if you were potentially in need of tires, then talking to the owner of a car that one of hankook's sponsored drivers on this forum owns is mutually a good idea.

Zoren 370 · 08-20-2014, 03:02 PM

Quote:

Originally Posted by GSS138

And yes, if you were potentially in need of tires, then talking to the owner of a car that one of hankook's sponsored drivers on this forum owns is mutually a good idea.

Who should I be talking too i need to get 2 front 255/35 19's soon?

GSS138 · 08-20-2014, 08:32 PM

Quote:

Originally Posted by Zoren 370

Who should I be talking too i need to get 2 front 255/35 19's soon?

If someone needed that I would talk to Martin82 :P

martin82 · 08-20-2014, 01:23 AM

Ps I do not run kw v3 lol

martin82 · 08-20-2014, 01:52 PM

we could just do custom front sway bar but it wont be cheap....

08-19-2014, 11:16 AM	#2 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	You'll see mentioned by some (I forget if it was mentioned in this thread) that in theory swaybars shouldn't be necessary on a perfect racecar. You'd just set the springs and dampers correctly to avoid the worst of the body roll, and you don't want the swaybar doing other possibly-negative unrelated things. The reason swaybars make so much sense on a production car in general is that springs which are hard enough to kill significant amounts of body roll are going to be way too hard for normal use, so the swaybar is making up for lack of spring in one particular area: body roll. But then again, even on some dedicated racecar designs that aren't based on production cars, you see some version of a roll bar on one or both ends of the car. It does have its purpose in fine-tuning sometimes. It's usually not nearly as dramatic in spring rate as a production-car rollbar, though. But yes, on our car you apparently just can't ever adequately kill the roll in the front, so you need both stiff springs and a stiff bar up there to help bring it under control. Zoren 370 and GSS138 like this. __________________ 7AT Track Car! Journal thread / Car setup details

08-19-2014, 07:38 PM	#4 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 16	Here is another bit... If you dont have adjustable front arms... You will need BAR. There isnt a lot of grip on the sidewall of any tire. Just sayin. Sent from my iPhone using Tapatalk FL 4Motion and GSS138 like this.

08-19-2014, 08:40 PM	#10 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 21	well shoot me a message, I dont pay ANYTHING retail LOL FL 4Motion likes this.

08-19-2014, 08:58 PM	#11 (permalink)
GSS138 Track Member Join Date: Mar 2013 Location: Mission Viejo, CA Posts: 769 Drives: '12 370Z 6M Sport Rep Power: 15	Yeah I didn't even understand why martin liked the damn KW, and he didn't understand why I hated it, and then I told him it's the colors, and then he said "Lakers Bro". And then it made sense to me. 18's are the way to go for affordability in tires. The price is honestly 100's of dollars difference as martin pointed out and there are many more options with a 18" wheel. It also improves your acceleration as the drag strip guys know. I run 19" Foose "Bling Chrome" wheels on street 1 because they look nice, but 2 I would be at a disadvantage on track. If you want to see the real problem browse the GTR forums where they all have 20" wheels. There are no tire options for those guys besides the toyo R888. They have one friggin tire option in that size. (maybe soon they will have the NT01) With an 18" wheels your tire options are 10 fold at least. And yes, if you were potentially in need of tires, then talking to the owner of a car that one of hankook's sponsored drivers on this forum owns is mutually a good idea. __________________ Current Mods: Vorpal Weapon +5.

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08-19-2014, 12:43 AM	#1 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 21	And on hankook rs3

08-19-2014, 03:36 PM	#3 (permalink)
Zoren 370 A True Z Fanatic Join Date: Mar 2012 Location: FL Posts: 11,018 Drives: 11 Nissan 370 M6 Rep Power: 1913655	Thanks guys I wish I have all your technical knowledge is setting our Z. But Im learning a lot from this tread.

08-19-2014, 07:59 PM	#8 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 21	worth downgrading to 18's just because of saving the $$ on tires alone, for example rs3's in 18's my hook up is under $900 but a set of 19's it's close to 1200. So after about 4 set of tires your savings is exactly 1 set of nt03 enkei 18x.5 wheels.

08-20-2014, 01:23 AM	#14 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 21	Ps I do not run kw v3 lol

08-20-2014, 01:52 PM	#15 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 21	we could just do custom front sway bar but it wont be cheap....

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