Just something interesting...thought I would share - Mazda3 Forums : The #1 Mazda 3 Forum
 
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post #1 of 10 (permalink) Old 05-14-2014, 03:22 PM Thread Starter
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Just something interesting...thought I would share

So I was watching this year's World Challenge races held at Barber Motorsports Park and I noticed that the Kia Optimas' set up looked a little odd.

Check out all that rear camber, stance nation!?!


It must have worked though considering a 1st and 2nd place finish in GTS class over 2 races. The only thing I can think is that Barber has huge elevation changes mixed with some very high speed corners and tons of curb riding. I guess that was the best way to keep the rear end planted. I've just never seen quite that much rear camber used on a fwd racecar before.

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post #2 of 10 (permalink) Old 05-14-2014, 03:29 PM
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Wowser, looks like -5+

Who knew. Tucked and hellaflushed really is faster! LOL
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post #3 of 10 (permalink) Old 05-14-2014, 04:36 PM
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May be in a class that requires OEM suspension arms, in which case lowering with an aggressive camber curve would cause that. I'm sure track testing has shown that's the fastest setup, otherwise it wouldn't be so.

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post #4 of 10 (permalink) Old 05-14-2014, 04:59 PM
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We need more entry oversteer though! I think that looks ridiculous, but I give credit to Kia actually participating in motorsport. I don't have much respect for car makers that don't race their cars.


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post #5 of 10 (permalink) Old 05-14-2014, 05:27 PM Thread Starter
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I didn't notice the rear camber in the other 2 races this year. But after looking through those event pics, the rear camber was pronounced. And, it seems to be progressing more and more negative with each event.

St. Petersburg:


Long Beach:


WC may have changed the regulations regarding OEM arms this year, but last year's setup had the tires much closer to 0 camber. 2013 pic:

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post #6 of 10 (permalink) Old 05-19-2014, 07:42 PM
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I thought I was the only one. Caught the first race on youtube and noticed it. Kinda like what I did on the Mini last year. Although with street tires I ran about -2.5 on the mini. I'm going to be tinkering with it again on the 3 after spring nationals. I'll have about 2 months to get the car dialed in and then comfortable with it.

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post #7 of 10 (permalink) Old 05-19-2014, 08:06 PM
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Quote:
Originally Posted by clemsonmz3 View Post

WC may have changed the regulations regarding OEM arms this year, but last year's setup had the tires much closer to 0 camber. 2013 pic:
That's a loaded suspension and not for comparison of static camber as the other are.

NOTE: Look how it's at nearly 0 camber at max turn angle... that's not by accident.
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post #8 of 10 (permalink) Old 05-20-2014, 09:33 AM Thread Starter
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Um ok, here's a fully loaded suspension from Long Beach 2014:

That rear tire is far from 0 camber this year. And that turn is slow and perfectly flat, there's no downhill off-camber weird stuff going on here.

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post #9 of 10 (permalink) Old 05-20-2014, 10:10 AM
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Yes, but is that the highest G corner/fastest corner at that track? Comparing corner to corner is great, but can only be done with the relative demands of that track taken into consideration.

I used to have a Mazda6 (1st gen) and the guys on those forums would mount a camera level on the sideline and tune alignments based on mid-corner passive camber measurements. Worked darn well for a few of them and would seem to maximize grip overall by requiring no more camber than needed for each track raced on.
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post #10 of 10 (permalink) Old 05-21-2014, 12:29 AM
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Excellent observation and excellent discussion in this thread!


Perhaps the KIA has a really crude rear suspension and the drastic negative camber is to make up for the terrible rear suspension camber curve.
This is common on cars with crude suspenions like my '89 5.0L Mustang.
Despite a bunch of aftermarket front suspension parts, the front suspension camber curve at the ride height is terrible.
To make up for it I run -2degrees negative camber on the front. This greatly improves handles but reduces braking effectiveness, tire life and straightline stability of the car.
It's all a compromise for street cars trying to go fast around corners!

Similarily on the that KIA, the extreme negative camber is reducing the braking effectiveness from the rear tires and straightline stability.

Could also be a different driver than last year that prefers the car set up differently than other drivers.

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