IRS -- hop, hop, hop! Best fix? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 04-28-2002, 01:07 PM Thread Starter
 
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IRS -- hop, hop, hop! Best fix?

I've seen plenty of discussion on the IRS hop. So here's my question? Is there a conensus on the best fix?

My '99 won't see much strip duty, and when it does it'll be street tires most likely. Replacing with IRS with a live axle is not an option, I have really grown to like the way the IRS handles on the rough roads around here.

I've heard that the IRS only hops when you lose traction -- true? I just bought this car with 13k miles on it, and it still has the factory Comp T/A's on it. Yuck. I'm thinking new tires will help, but my '98 will happily roast the RE730's, so I'm guessing traction will still be a problem on the '99, especially when I get the 4.11's installed.

Suggestions please! I want to do this car right.

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post #2 of 3 Old 04-28-2002, 02:12 PM
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I'm interested in this one as well, so I'm subscribing. I've heard that good bushings go a long way on these cars. I'd be a little hesitant to try them in my current state, especially with the vibration the way it is. Harder bushings only increase the transmission of axle vibrations through the chassis that much better.


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post #3 of 3 Old 04-28-2002, 02:47 PM
 
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Well the best thing is to go live axle (thought I would say that before any one else )

But there are a few things you can do to help with the wheel hop.
1) Replace the bushings Steeda

2) Add a IRS Pinion Support Brace (second picture down)

3) Replace the springs. I have heard that replacing the springs with a higher tension rating will keep the tires from hopping as well. This is do to greater down force on the tires.


I myself have H&R super sport springs. I do not have them on yet but one of my friends here in KC (Angus) has the Bushings and the Sport brace along with Steeda springs he has 4.10 rearend and not all that much wheel hop. He is pushing out right at 300hp and 300lb of TQ at the wheels. The hop might increase with the more power you get to the ground. In this case you might want to look into the GKN Stage three shafts. The more wheel hop the more likely you are to break one..

Hope this helps
99Cobra
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