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Old 03-09-2014, 10:53 PM   #1
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Suspension Upgrades/issue

So I recently put on my 19in AMR wheels (they look great), but noticed an issue with the rear axle. It seems to sway side to side going over bumps in corners. With the stock 17's it wasn't really and issue, but now that I have larger/heavier wheels its way more noticeable. My question is what upgrades would most effectively take care of this problem?

I plan to get an adjustable panhard bar and brace, LCA's, sway bar (or just the end links from BMR if they fit), and UCA. Since I have limited funds, what's the most effective upgrade to get first that will help fix the issue?

Thanks
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Old 03-09-2014, 11:03 PM   #2
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Suspension Upgrades/issue

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Originally Posted by paintmann111 View Post
So I recently put on my 19in AMR wheels (they look great), but noticed an issue with the rear axle. It seems to sway side to side going over bumps in corners. With the stock 17's it wasn't really and issue, but now that I have larger/heavier wheels its way more noticeable. My question is what upgrades would most effectively take care of this problem?



I plan to get an adjustable panhard bar and brace, LCA's, sway bar (or just the end links from BMR if they fit), and UCA. Since I have limited funds, what's the most effective upgrade to get first that will help fix the issue?



Thanks

The key word here is "noticeable".

The geometry of how the panhard bar works as the suspension rises and falls will move the rear end from side to side. (Think of a triangle... Missing the right side... As the suspension lowers, the axle is pushed to the left... As the suspension risers, the axle moves to the right. ). Your new wheel setup is probably wider (this more visible from looking in the side mirrors).

The only way to solve the lateral movement is with a different rear end setup... Like a watts link.
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Old 03-09-2014, 11:24 PM   #3
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I know the overall tire height is roughly the same (245.45R19 vs 215/65r17), but a 30mm width increase makes it that much more noticeable? I was hoping the better made panhard bar, brace, etc would help prevent any kind of flex. If not then I won't waste my money on that stuff. Thanks for the reply.
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Old 03-09-2014, 11:38 PM   #4
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I know the overall tire height is roughly the same (245.45R19 vs 215/65r17), but a 30mm width increase makes it that much more noticeable? I was hoping the better made panhard bar, brace, etc would help prevent any kind of flex. If not then I won't waste my money on that stuff. Thanks for the reply.

It isn't a "flex" issue. But rather how the stock solid rear axle/suspension moves.

Unless you replace it as I said with a fays/watts link.
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Old 03-10-2014, 10:38 AM   #5
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So the UCA, LCA and panhard bar upgrades help with straight line acceleration issues? I see. Guess I'll just live with it then. Lol
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Old 03-10-2014, 11:03 AM   #6
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Quote:
Originally Posted by paintmann111 View Post
So I recently put on my 19in AMR wheels (they look great), but noticed an issue with the rear axle. It seems to sway side to side going over bumps in corners. With the stock 17's it wasn't really and issue, but now that I have larger/heavier wheels its way more noticeable. My question is what upgrades would most effectively take care of this problem?

I plan to get an adjustable panhard bar and brace, LCA's, sway bar (or just the end links from BMR if they fit), and UCA. Since I have limited funds, what's the most effective upgrade to get first that will help fix the issue?

Thanks
paintmann111,

Is your Mustang lowered at all, or is the full suspension completely stock? You can improve the stiffening of the lateral movement with an aftermarket Panhard bar, but the improvement will be minimum. The Panhard bar is usually upgrade just to recent the rear axle under a car that has changed it's ride height.

Are you most concerned about the movement during hard acceleration around a turn, or while cruising and hitting a bump or pothole?

Shane
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Old 03-10-2014, 11:29 AM   #7
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My car is stock everything other than rims. Its my DD and when I go around a corner fast and hit a bump the rear end sways. I can live with it but coming from an IRS its a change. Its kind of sketchy doing 65 through Worcester MA on 290. Lots of bumps and curves and the lanes are pretty tight. Lol
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Old 03-10-2014, 11:42 AM   #8
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Suspension Upgrades/issue

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My car is stock everything other than rims. Its my DD and when I go around a corner fast and hit a bump the rear end sways. I can live with it but coming from an IRS its a change. Its kind of sketchy doing 65 through Worcester MA on 290. Lots of bumps and curves and the lanes are pretty tight. Lol

Ok. You are talking about something totally different than I thought you were. You are talking about the @$$ of the car sliding. Welcome to Rwd solid rear axle. All you need to do now is floor it to complete the power slide!!!!
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Old 03-10-2014, 02:44 PM   #9
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No, you were correct the first time. I'm talking about the axle moving left to right while going over bumps in a corner independent of the body. After reading about the watts system that seems like it would fix it, although at that price I'll live with it. Lol
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Old 03-10-2014, 02:48 PM   #10
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Ok. You are talking about something totally different than I thought you were. You are talking about the @$$ of the car sliding. Welcome to Rwd solid rear axle. All you need to do now is floor it to complete the power slide!!!!
That's one of the things that makes the mustang so darn awesome. Its SRA! Its a straight line power house, modern day muscle car that does handle well. Someone wants corning like a champ, go back to IRS sports car or get the 2015 mustang. Love that power slide out.
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Old 03-10-2014, 06:15 PM   #11
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I do plan on lowering it so I am going to get the panhard bar, brace, uca and lca's anyways.
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Old 03-11-2014, 11:58 AM   #12
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Quote:
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My car is stock everything other than rims. Its my DD and when I go around a corner fast and hit a bump the rear end sways. I can live with it but coming from an IRS its a change. Its kind of sketchy doing 65 through Worcester MA on 290. Lots of bumps and curves and the lanes are pretty tight. Lol
Okay gotcha. If that's your concern, there are ways to reduce the swaying and bouncing of the rear end. Upgrading the struts/shocks shortens the bounce time after hitting a pothole. Plus you'll feel the rear end much more planted to the ground. I'd suggest Koni STR.T dampeners for a solid performing and affordable option.

Hope this helps!

Shane
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