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Discussion Starter #1
I've got a decect amount invested in the handling of my mustang, but I still don't like the way it handles especially high speed. My biggest complaint is it feels to busy on the highway. Small changes in pavement grab the tires, maybe it would be called too much feedback. When my car was bone stock (so long ago) I remember it being fast and stable at high speeds. I could take my hand off the wheel at 90 and still track straight and true. It felt safe and secure at high speeds. Now if I remove my hand for a second it feels like it could pull in any direction. Maybe my alignment settings?? I don't know please help. Here are my modifications, any questions please just ask.

285/35/18(rear) 265/35/18(front) Falken Z-rated
Eibach Pro-kit springs
KYB AGX shocks (softest settings)
Steeda X2 balljoints
Steeda Bumpsteer kit
FRPP Caster camber plates
Alignment settings:Caster +6, Camber -1, Toe 1/16" in
 

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I'd be wary of worn A-arm bushings, ball joints and tie rod ends too.
 

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The alignment settings you posted should not cause or contribute to this problem. In fact, the additional caster you have added should help.

Did you actually adjust bump steer on the car, or just throw the parts on? (No insult intended; you didn't say, so it had to be asked.)

Try swapping front tires with someone who doesn't have this issue. If you still have the problem, bushings jump to the top of the list IMO.
 

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Discussion Starter #6
We measured the toe with the car static and when it was compressed (strapped down the fron end). The difference would be the bump steer, correct? I changed the spacers until it had a very slight toe in on compression. I tried to get no change at all, but it was impossible. I left it with the closest change but still towing in.

I know what bumpsteer feels like because I had it before, this feels different.
 

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fastgreen94 said:
We measured the toe with the car static and when it was compressed (strapped down the fron end). The difference would be the bump steer, correct?
Well, it would be in compression. :) What about in extension?

If you're convinced it's not bump steer, take a hard look at and try swapping tires.

My car runs 1/4" toe out for auto-cross. It's much more twitchy at highway speeds on R compounds than when on my Firestone SZ50 street tires. Tread pattern and wear can also affect this.
 

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Here's the cure. The Lady Luck suicide steering wheel knob.
 

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Discussion Starter #9
rfloz said:
Well, it would be in compression. :) What about in extension?

If you're convinced it's not bump steer, take a hard look at and try swapping tires.

My car runs 1/4" toe out for auto-cross. It's much more twitchy at highway speeds on R compounds than when on my Firestone SZ50 street tires. Tread pattern and wear can also affect this.
I mean lets be realistic. Every car is going to have some bumpsteer. The key is to get the arc of the control arm and the arc of the tie rod as close as possible. I belive I have done that. I will swap to another set of tires and see if that makes a difference. Also for Ha-Has I think I will return to factory Align specs to see if that makes a difference. Also, how do I tell If my A-arm bushings are bad, should I replace them with poly?

Thanks.
 

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To be serious the components and settings you have should be working for you. If the tires have any sawtooth or irreguler wear nothing will stop it from dancing around.

If an a-frame bushing is bad enough to be causing excessive play it will usually have visible damage. Get under the car and look at them and see if they look like they are off center from the bolts or if they have hunks of rubber hanging loose around the edges. You can also try prying with a pry bar to see if you can move the a-frame in or out.

It is most likely in the tires if nothing is worn. Look at the tires and see if they have a dished look in the middle or if they look rounded. Some of the wet tread directional tires seem to develop a dished look in the center and that can wreak havoc on the steering. You can also run your hand over the tread to see if it feels like it has sawtooth wear. In one direction you will feel edges and not in the other direction.

You could try a little less caster to see if it makes a difference. That doesn't cost anything to try and is easy to return to where you have it.
 

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Where did you have it aligned?
How good was the alignment machine?
It sounds toe is a little out, 1/16 in is good if that is what the machine really set it at. Or adjusted nut may have come loose or bad tie rods.

Good luck, until then both hands on the wheel :)
Jay
 

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Discussion Starter #12
Thanks for the input. The tires are pratically new, I run the Falken GRB Fk-451. I don't think they are the problem. I will check the arm bushings (they have over 100k). And I will return to factory align just to see if there is a difference. I was there when we did the align so I know the specs are accurate. Maybe I knocked something loose, its worth it to check.

Thanks for the help
 
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