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Old 05-31-2011, 01:55 PM   Thread Starter #1
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Default Straight Line Swaying

I recently installed 2 rear bars and a stillen strut tower bar and since then I noticed that at higher speeds my car is pretty unstable in a straight line. At around 100 it gets to the point where it just does not feel safe anymore because the car is waving back and forth like a drunk driver.

I know I cannot have the best of both worlds, it's either going to corner awesome, or be very stable in a straight line. What do I need to install now to get to an area in between, where I cornder decent but don't feel like I am going to die on a strip?

Also, lowered on Eibach Pro, I would imagine ride heigh comes into play. They have been on the car for 2 years so they are well settled in.
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Old 05-31-2011, 01:57 PM   #2
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Default Re: Straight Line Swaying

Your issue isn't suspension upgrades. Check your tire pressure and get an alignment.
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Old 05-31-2011, 02:06 PM   #3
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Default Re: Straight line swaying

Heres a crazy idea...dont go 100MPH!!
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Old 05-31-2011, 02:10 PM   Thread Starter #4
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Default Re: Straight line swaying

Well I know I can't align my rear tires without getting aftermarket parts. Last time I brought it in they had it adjusted as far as it would go. Last year I was looking into getting, I think, a 350Z lower control arm?

What do you run for pressure? I'm on Z rated Nittos, I remember not being able to inflate them to their recommended pressure without my flat tire light turning on. Annoying.
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Old 05-31-2011, 02:19 PM   Thread Starter #5
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Default Re: Straight line swaying

Originally Posted by 07maximan View Post
Heres a crazy idea...dont go 100MPH!!
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Old 05-31-2011, 02:30 PM   #6
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Default Re: Straight line swaying

Originally Posted by 07maximan View Post
Heres a crazy idea...dont go 100MPH!!
well said!
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Old 05-31-2011, 02:54 PM   Thread Starter #7
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Default Re: Straight line swaying

Why are we pretending that people don't get their cars up to 100 mph. I don't constantly drive 100MPH, actually I maybe hit it once a month and always make sure there isn't another car in sight. I'm not a moron. On the highway typically I wont even break 67mph since my car stands out so bad as it is.
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Old 05-31-2011, 03:07 PM   #8
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Default Re: Straight Line Swaying

Originally Posted by h4x1ma View Post
Well I know I can't align my rear tires without getting aftermarket parts. Last time I brought it in they had it adjusted as far as it would go. Last year I was looking into getting, I think, a 350Z lower control arm?

What do you run for pressure? I'm on Z rated Nittos, I remember not being able to inflate them to their recommended pressure without my flat tire light turning on. Annoying.
On my tires it says 51 PSI, but I only have the dealer put in 37 in nitrogen. That's with 30 series tires.

What's your max PSI on your tires? It should say it on the tire wall.
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Old 05-31-2011, 03:18 PM   #9
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Default Re: Straight line swaying

It cant be the kcmaxx bars or the front strut bar.. you either need an alignment or as rani said, air pressure. I dont think i've ever heard anyone have this issue after adding either of the suspension items.
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Old 05-31-2011, 05:04 PM   Thread Starter #10
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Default Re: Straight line swaying

Originally Posted by Deadbolt View Post
On my tires it says 51 PSI, but I only have the dealer put in 37 in nitrogen. That's with 30 series tires.

What's your max PSI on your tires? It should say it on the tire wall.
Tires say 50, I think I run around 35
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Old 05-31-2011, 05:07 PM   #11
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Default Re: Straight line swaying

Originally Posted by h4x1ma View Post
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LOL, Everytime I see something like this it cracks me up..
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Old 06-03-2011, 01:24 PM   Thread Starter #12
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Default Re: Straight Line Swaying

Well i put all my tires at 40 and this seemed to die down a lot. I can't believe that 1-2 PSI really makes that much of a difference
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Old 06-03-2011, 02:25 PM   #13
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Default Re: Straight Line Swaying

You shouldn't run your tires at the pressure marked on the sidewall. That is the MAX pressure the tire is rated for...NOT the recommended pressure.
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Old 06-03-2011, 10:53 PM   #14
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Default Re: Straight Line Swaying

Originally Posted by 1hawaii50 View Post
You shouldn't run your tires at the pressure marked on the sidewall. That is the MAX pressure the tire is rated for...NOT the recommended pressure.
I don't know how many times I hear people say they put what the tire says. It can not be said enough, that is the MAX.

255/35/20 and I run around 37psi.
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Old 06-03-2011, 11:38 PM   #15
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Default Re: Straight Line Swaying

Originally Posted by h4x1ma View Post
Well i put all my tires at 40 and this seemed to die down a lot. I can't believe that 1-2 PSI really makes that much of a difference
You would be surprised that it does...
You have to play around with diff pressures as compared to your tires and suspension set up. I run 47 psi nitrogen all around with Nitto Invo on a 275 in the rear and 245 in the front.. Lowered on eibachs, one KCMAXXX bar in the rear, raceline up front and progress rear sway... Doing 100+ there are no issues... It has to have something to do with your alignment or the quality of your tires.. All tires are not created equal...lol
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