Cobra IRS on a foxbody - Mustang Evolution

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Old 01-02-2014, 09:49 AM   #1
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Cobra IRS on a foxbody

Anyone know of anyone thats done this? If so can someone tell me the pros and cons of the conversion
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Old 01-02-2014, 11:12 AM   #2
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It has been done. I do not believe it is a straight conversion onto the foxbody.

But pros is better ride and better handling

Con is that if you drag race it will be weaker than the SRA
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Old 01-02-2014, 01:44 PM   #3
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It has been done. I do not believe it is a straight conversion onto the foxbody.

But pros is better ride and better handling

Con is that if you drag race it will be weaker than the SRA
Ill be doing autocross and road racing, is the rear end of the irs same size or bigger than the fox? Ill be trying to put one on my 85 this winter
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Old 01-02-2014, 01:46 PM   #4
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Quote:
Originally Posted by mach5894

Ill be doing autocross and road racing, is the rear end of the irs same size or bigger than the fox? Ill be trying to put one on my 85 this winter
It's a touch wider. I have a friend doing the same with an 86 at the moment. I know he has run into a few issues.
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Old 01-02-2014, 01:49 PM   #5
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My buddy did this on his 91 fox and loved the ride afterwards.
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Old 01-02-2014, 02:01 PM   #6
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Anyone know of anyone thats done this? If so can someone tell me the pros and cons of the conversion
The adjustability will be nice for road race and auto x. The ride is definitely smoother and the exhaust looks sexy. Down side is you're adding somewhere around 200 pounds to the car. Definitely do the FTBR bushing kit while it's out
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Old 01-02-2014, 04:20 PM   #7
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The adjustability will be nice for road race and auto x. The ride is definitely smoother and the exhaust looks sexy. Down side is you're adding somewhere around 200 pounds to the car. Definitely do the FTBR bushing kit while it's out
What does the bushing kit do?

---------- Post added at 04:20 PM ---------- Previous post was at 04:19 PM ----------

Quote:
Originally Posted by mach5894 View Post

Ill be doing autocross and road racing, is the rear end of the irs same size or bigger than the fox? Ill be trying to put one on my 85 this winter
Do you know what probs he ran into?
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Old 01-02-2014, 04:58 PM   #8
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The adjustability will be nice for road race and auto x. The ride is definitely smoother and the exhaust looks sexy. Down side is you're adding somewhere around 200 pounds to the car. Definitely do the FTBR bushing kit while it's out

Remember that foxbodies are also fairly light in the rear end. The extra weight in the rear will most likely help him out.
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Old 01-02-2014, 06:46 PM   #9
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What does the bushing kit do?[COLOR="Silver"]
It's a delrin bushing kit that helps reduce when hop as well as help tighten up thebrear end




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Remember that foxbodies are also fairly light in the rear end. The extra weight in the rear will most likely help him out.
That's true.
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Old 01-02-2014, 09:35 PM   #10
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It's a delrin bushing kit that helps reduce when hop as well as help tighten up thebrear end

That's true.
You know if I can still run 17x9?
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Old 01-02-2014, 09:58 PM   #11
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You should be just fine. I run a 17X10.5 on mine, but I know the New Edges have a wider wheel well to fit something like that
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Old 01-02-2014, 10:09 PM   #12
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You should be just fine. I run a 17X10.5 on mine, but I know the New Edges have a wider wheel well to fit something like that
Think I might have to roll mine out?
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Old 01-02-2014, 10:14 PM   #13
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Think I might have to roll mine out?
Might be a good idea
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Old 01-02-2014, 10:19 PM   #14
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Might be a good idea
What if I got got custom backspaced rims
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Old 01-02-2014, 10:41 PM   #15
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What if I got got custom backspaced rims
I honestly don't know much about wheel spacing on a Fox. What's the biggest you can fit on a normal 8.8 fox?
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Old 01-03-2014, 09:07 AM   #16
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The IRS and any 99-up rear is something like 3.5" wider than the fox rear. You will be limited to an 8" wide rim and a 245 without a mini tub.
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Old 01-03-2014, 09:22 AM   #17
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The IRS and any 99-up rear is something like 3.5" wider than the fox rear. You will be limited to an 8" wide rim and a 245 without a mini tub.
What if I roll it out?
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Old 01-03-2014, 09:29 AM   #18
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Then you can go wider, maybe a 9" rim with a 255 or something on it. You're going to need to mini tub to run a fat tire like you want.
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