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Old 09-06-2011, 09:38 PM   #1
Management
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Default Getting the rear of the car to stick...

Ok guys, I've been running (As well as Terry) my new tire setup with pretty good results. I'd say the C71's are really giving the car justice. Terry and blakes driving of my car while I've been gone have also been pretty impressive. However, the rear of the car is pretty loose with the current setup. With as big as my car is, its impressive that I have OVERSTEER issues and not understeer.

Currently I am running 275/40/17 Hankook Z214 C71 compound up front and the 245/40/17 in the rear. With the weight over the rear wheels being less then 1,000 lbs I'm starting to think that the rear tires are not getting enough heat. I havn't had a pyrometer on them, but you can tell just by touching them. For swaybars I have a 19.5mm Swaybar up front (The smallest possible) and a 26mm in the rear. I'm thinking about backing the rear down to a 24mm, and backing down the rear camber from -2.0* to -1.75* or -1.5*.

For springs, I run 430 Rear and 500 Front, I won't be changing these because I am happy with this setup, and not to mention its on the edge of what the Koni's in my car can handle. So, any other thoughts? What else can I do to improve rear end grip?

The car is certainly manageable as is, but I'd like a little more confidence while driving it. Any thoughts?

-Sam
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Old 09-07-2011, 06:03 AM   #2
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Drop spring rate , drop rear tire pressures( or raise it depending on how low you are now ) , drop rear sway bar rate , adjust rear shocks . Any combination of the 4 . Are your struts adjustable ? What pressures do you run front and rear ?
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Old 09-07-2011, 08:48 AM   #3
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also increasing front bar will help, less camber will make the rear looser.
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Old 09-07-2011, 12:57 PM   #4
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Sounds like not enough front roll stiffness relative to rear...

How much does the car weigh?

Also, what Feeney said. Less rear camber will not help the problem.
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Old 09-07-2011, 05:49 PM   #5
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^ My first thought , but he said he didnt want to increase springs because they were already at the limit that his struts would control , pretty much just leaves softening the rear , unless maybe more front rebound can be cranked in , that could bandaid the problem .
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Old 09-07-2011, 07:59 PM   #6
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It seems with more rear Negative camber, the car is a bit more squirmy, but it could be just in my head. The car runs a simple Ground Control/Koni Yellow kit. So the adjust-ability is limited. I run the smallest front bar possible on my car. Its current weight is 2840 W/O driver and 3,000 W/Driver. For rear tire pressure, I generally keep it at 32 Cold, It seems to go up to about 35 or with a few runs in.

I think what I will do is keep the alignment specs as they are and try going from a 26 rear bar, to a 24 and see how that helps. I wish I had the means to trailer the car, I'd love to get more weight off the front of it!

-Sam
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Old 09-08-2011, 09:43 AM   #7
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Throw a couple of dead hookers in the trunk. That'll weight the rear end down a little.....
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Old 09-08-2011, 11:20 AM   #8
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Actually more weight in the rear will make it looser.

Have you checked your alignment? Even a slight amount of REAR toe out can bring on a loose condition. This can be almost impossible to dial out using your regular adjustments on the other suspension adjustments you normally use.

Hope that helps,

Alan
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Old 09-08-2011, 06:35 PM   #9
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Quote:
Originally Posted by DrSideways View Post
Actually more weight in the rear will make it looser.

Have you checked your alignment? Even a slight amount of REAR toe out can bring on a loose condition. This can be almost impossible to dial out using your regular adjustments on the other suspension adjustments you normally use.

Hope that helps,

Alan
Yea, I run 0 Toe in the rear.

-Sam
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Old 09-09-2011, 01:33 AM   #10
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Quote:
Originally Posted by SHOspazz92 View Post
I run the smallest front bar possible on my car.
Try a bigger front bar. Or try disconnecting the rear bar.
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