How wide tires affect overall performance

Jordo!

Wouldn't an overly wide front increase oversteer?

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Chuck33079

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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wheee!

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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Chuck33079

You maintained the stock stagger. 245 to 275= 30mm, 275 to 305=30mm.

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DEpointfive0

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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FortuneLSX-TT

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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Chuck33079

Or set the rear sway to full stiff to at least help out some.

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Apoc370z

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.

DEpointfive0

My bad! Meant under steer! Lol

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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FortuneLSX-TT

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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DEpointfive0

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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FortuneLSX-TT

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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skidad62

Will 305s on Rays clear without camber if I'm running 25mm spacers?

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DEpointfive0

I's confuzed too...


That's why I took the crappy lazy way out, lol

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Zoren 370

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.