Wider car setup

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Kai Hur
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Wider car setup

Postby Kai Hur » Sun Sep 17, 2017 7:41 am

With same size wheels and tires would a wider track in the front or back give better rotation? On a fwd.

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Robert Puertas
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Re: Wider car setup

Postby Robert Puertas » Sun Sep 17, 2017 9:29 am

Multiple factors, but the simple math is wider track = longer lever on the suspension geometry = softer "spring rate" = more grip.

So if you want it to rotate more, and the only adjustment you have is to widen one end, widen the front.

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Ed T
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Re: Wider car setup

Postby Ed T » Sun Sep 17, 2017 8:21 pm

Robert Puertas wrote:Multiple factors, but the simple math is wider track = longer lever on the suspension geometry = softer "spring rate" = more grip.


Does the wider track = softer "spring rate" principle hold for both double wishbones and macstruts?
ES #711 2003 Toyota MR2 Spyder

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Craig Naylor
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Re: Wider car setup

Postby Craig Naylor » Wed Sep 20, 2017 8:49 pm

Kai Hur wrote:With same size wheels and tires would a wider track in the front or back give better rotation? On a fwd.


Back when I was running the Integra in GS, I ran Kuhmo Victoracers in the front, and Falken Azenis - 215's (model not size) in the rear.
Similar intent, where your looking at track, I played with rubber compounds to increase grip in the front, decrease in the rear, for more rotation, since I couldn't play with spring rates in Stock.

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Kai Hur
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Re: Wider car setup

Postby Kai Hur » Sun Sep 24, 2017 8:02 pm

I did the same with my accord a decade ago.. 225 Hoosiers in front 205 v700 in the back..

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Jayson Woodruff
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Re: Wider car setup

Postby Jayson Woodruff » Mon Sep 25, 2017 11:16 am

Kai Hur wrote:I did the same with my accord a decade ago.. 225 Hoosiers in front 205 v700 in the back..

Trouble with mixing tires is they typically change differently with heat. This specific case I can see the hoosiers being super sticky cold, then fade as the V700s get good, i.e. your rotation characteristics change quite a bit as you drive.

Air pressure and staggered widths seem like a more consistent solution.

Jay W

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Kai Hur
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Re: Wider car setup

Postby Kai Hur » Mon Sep 25, 2017 11:47 am

Well my initial post was intended for my spacer placement.. same wheels and tires all around. As Robert recommends seems that placing the spacer in the front widening the track will yield better rotation

Eric Wong
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Re: Wider car setup

Postby Eric Wong » Mon Oct 23, 2017 3:21 pm

I'm a total newbie at this, but wouldn't making a car wider make slaloms and linked turns more difficult? I understand the CG would be lowered; and maybe that offsets the bigger steering inputs required.

Anyways I always feel like my car is too big whether it's autocrossing, driving on the street, or finding a parking spot; maybe I'll get a Smart car :)

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Craig Naylor
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Re: Wider car setup

Postby Craig Naylor » Tue Oct 24, 2017 9:03 pm

Eric Wong wrote:I'm a total newbie at this, but wouldn't making a car wider make slaloms and linked turns more difficult? I understand the CG would be lowered; and maybe that offsets the bigger steering inputs required.

Anyways I always feel like my car is too big whether it's autocrossing, driving on the street, or finding a parking spot; maybe I'll get a Smart car :)


With spacers, were talking 1/8", 1/4", or 1/2" per side.
- Personally I'm much more than that. OEM rims are 45mm offset, my aftermarket rims are 30mm (15mm difference = .6"). OEM's were 5", aftermarket are 7.5" (another ~1" wider?) I also run two (2) 1/4" spacers on each wheel. So I'm at ~ +1.1 - 2.1" in additional width.

IMHO,I get pretty close to cones...(I know my car's corners pretty well)... but not consistently close enough that even the 1/2" (or in my case even the 1-2") started making me hit cones left and right. If I was always 3-4" off of the important cone's... I'd be ecstatic! At best the change brought me closer to being within that range, at worst (if you could call it that), it's brought me even closer than that range.


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