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How wide tires affect overall performance

Originally Posted by osbornsm Generally Speaking OP: TOO wide front tire = More Understeer TOO wide rear = no such thing *Note: There is such thing as having a tire

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Old 09-25-2013, 03:26 PM   #16 (permalink)
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Originally Posted by osbornsm View Post
Generally Speaking OP:

TOO wide front tire = More Understeer
TOO wide rear = no such thing

*Note: There is such thing as having a tire too wide for the wheel also
Wouldn't an overly wide front increase oversteer?
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Old 09-25-2013, 03:28 PM   #17 (permalink)
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Wouldn't an overly wide front increase oversteer?
Yes, too wide on either end will make the other end grip less respectively. Too wide in back, understeer. Too wide in front, oversteer.
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Old 09-25-2013, 03:57 PM   #18 (permalink)
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Interesting... my 305 rear and front 275's seem to be perfect balance right now. My camber in the front is -1.6 and the rear is -1.2.... on the track it seems to be extremely nimble but no loss of 'balance'. I noticed neither understeer or oversteer throughout the roadcourse.
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Old 09-25-2013, 04:29 PM   #19 (permalink)
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Originally Posted by wheee! View Post
Interesting... my 305 rear and front 275's seem to be perfect balance right now. My camber in the front is -1.6 and the rear is -1.2.... on the track it seems to be extremely nimble but no loss of 'balance'. I noticed neither understeer or oversteer throughout the roadcourse.
You maintained the stock stagger. 245 to 275= 30mm, 275 to 305=30mm.
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Old 09-25-2013, 04:39 PM   #20 (permalink)
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You maintained the stock stagger. 245 to 275= 30mm, 275 to 305=30mm.
I'm gonna not go stock stagger and get 245 and 305. I'll take the risk of understeer

245's are on clearance, and 305's are on clearance as well... Lol
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Last edited by DEpointfive0; 09-25-2013 at 05:19 PM. Reason: I meant understeer!
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Old 09-25-2013, 04:46 PM   #21 (permalink)
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I'm gonna not go stock stagger and get 245 and 305. I'll take the risk of oversteer

245's are on clearance, and 305's are on clearance as well... Lol
A 60mm stagger...ouch. You won't be oversteering, you'll have serious understeer.

Your fronts will have a lot less grip compared to the rear. Meaning if you go into a corner hot, your rears will handle it and not step out. Your fronts won't have enough traction to change direction and instead of turning, they will go straighter than you'd like. With a RWD, you can always give it a bit of power to reduce the traction to the rear and try and get some power induced oversteer though.
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Old 09-25-2013, 04:59 PM   #22 (permalink)
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Originally Posted by FortuneLSX-TT View Post
A 60mm stagger...ouch. You won't be oversteering, you'll have serious understeer.

Your fronts will have a lot less grip compared to the rear. Meaning if you go into a corner hot, your rears will handle it and not step out. Your fronts won't have enough traction to change direction and instead of turning, they will go straighter than you'd like. With a RWD, you can always give it a bit of power to reduce the traction to the rear and try and get some power induced oversteer though.
Or set the rear sway to full stiff to at least help out some.
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Old 09-25-2013, 05:09 PM   #23 (permalink)
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Thanks a lot for all the input, i do not wanna quote and reply to individual posts with my phone so i will do that when i am at home.
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Old 09-25-2013, 05:20 PM   #24 (permalink)
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Originally Posted by FortuneLSX-TT View Post
A 60mm stagger...ouch. You won't be oversteering, you'll have serious understeer.

Your fronts will have a lot less grip compared to the rear. Meaning if you go into a corner hot, your rears will handle it and not step out. Your fronts won't have enough traction to change direction and instead of turning, they will go straighter than you'd like. With a RWD, you can always give it a bit of power to reduce the traction to the rear and try and get some power induced oversteer though.
My bad! Meant under steer! Lol

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Or set the rear sway to full stiff to at least help out some.
My current bars aren't adjustable, but if I find it to be too much, I'll spring for an adjustable or stiffer rear bar
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Old 09-25-2013, 05:34 PM   #25 (permalink)
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Or set the rear sway to full stiff to at least help out some.
I'm new to sway bar settings myself. So could you explain how stiffening the rear sway bar will help with too much grip in the rear already? I was under the impression that stiffer = kept the tires planted more = more grip.

Secondly, wouldn't he want to work on increasing the front grip instead of reducing the rear grip? Which would negate any benefit the 305's would of given him and simply reduce overall traction?
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Old 09-25-2013, 05:54 PM   #26 (permalink)
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I'm new to sway bar settings myself. So could you explain how stiffening the rear sway bar will help with too much grip in the rear already? I was under the impression that stiffer = kept the tires planted more = more grip.

Secondly, wouldn't he want to work on increasing the front grip instead of reducing the rear grip? Which would negate any benefit the 305's would of given him and simply reduce overall traction?
You get different data/input from different sources.


The GENERAL rule is:
Increase front bar stiffness, increase understeer.
Increase rear bar stiffness, increase oversteer.
I think the thinking is weight transfer/balance in turns?

The track guys, IIRC, say that you need more front bar for better traction/oversteer though.


All I know is that it's a balancing act and too much/too little of either bar plays different roles depending on what kind of driving you're going to be doing.



My input, for me, 99.9% of my driving is very aggressive street driving, so I got the Nismo S-Tune bars, because I assume they know what they're doing a bit, and they are making a stiffness setting for the masses, which I fall into.
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Old 09-25-2013, 06:06 PM   #27 (permalink)
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Originally Posted by DEpointfive0 View Post
You get different data/input from different sources.


The GENERAL rule is:
Increase front bar stiffness, increase understeer.
Increase rear bar stiffness, increase oversteer.
I think the thinking is weight transfer/balance in turns?

The track guys, IIRC, say that you need more front bar for better traction/oversteer though.


All I know is that it's a balancing act and too much/too little of either bar plays different roles depending on what kind of driving you're going to be doing.



My input, for me, 99.9% of my driving is very aggressive street driving, so I got the Nismo S-Tune bars, because I assume they know what they're doing a bit, and they are making a stiffness setting for the masses, which I fall into.
I tried looking online, and you're right I'm getting a lot of conflicting information. The bottom line was "it depends" and its all about balance. Increased stiffness may increase grip, but then again going too far reduces it. The best I understand it now is thus: (if someone understands it better please correct me if I'm wrong)

The front is looser than the rear under that scenario. Which means the front rolls a bit more, and since the rear doesn't roll it has to slide. So it's all about the balance of the two.

I'd still think that softening the front relative to the rear would be the way to increase overall traction. I.e. upgrade both front and rear, but put rear on stiffer and the front on softer. So both bars are stiffer than stock, but the rear increases stiffness more than the front.

Suspension is confusing...
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Old 09-25-2013, 06:14 PM   #28 (permalink)
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Will 305s on Rays clear without camber if I'm running 25mm spacers?
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Old 09-25-2013, 06:14 PM   #29 (permalink)
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Suspension is confusing...
I's confuzed too...


That's why I took the crappy lazy way out, lol
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Old 09-25-2013, 06:16 PM   #30 (permalink)
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This is the reason I like this forum so many smarty pants! Very informative! Thank you much!
Guys Op said he doesn't track the car so what the fuss...as long you enjoy your Z and like how it looks it doesn't matter! We still love you because your nuts about the Z.
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