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Old 07-22-2010, 06:27 PM   #1
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Switching to Cobra IRS!

Im gonna be switching to the 03-04 IRS rear suspention. one thing Im curious about it the brakes. My stock wheels are 15inchers. They have my snow tires on them. Will they still fit with the cobra rear rotors? Or would they be pushing it? Also one other thing, before I put this puppy in, should I change the rubber bushings to urithane?
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Old 07-22-2010, 07:00 PM   #2
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Re: Switching to Cobra IRS!

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Im gonna be switching to the 03-04 IRS rear suspention. one thing Im curious about it the brakes. My stock wheels are 15inchers. They have my snow tires on them. Will they still fit with the cobra rear rotors? Or would they be pushing it? Also one other thing, before I put this puppy in, should I change the rubber bushings to urithane?

You should do everything you can... And pray you don't break a half shaft in it, ever.
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Old 07-22-2010, 07:28 PM   #3
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Re: Switching to Cobra IRS!

mine is a V6, I dout Ill snap a half shaft
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Old 07-22-2010, 09:09 PM   #4
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Re: Switching to Cobra IRS!

15" wheels will not clear the rotors/calipers. 16" wheels will clear just fine however.
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Old 07-22-2010, 09:25 PM   #5
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Re: Switching to Cobra IRS!

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15" wheels will not clear the rotors/calipers. 16" wheels will clear just fine however.
So I might have to put my old rotors on the IRS.
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Old 07-22-2010, 10:03 PM   #6
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Re: Switching to Cobra IRS!

The rotors is not the issue. The mounting bracket for the calipers on the IRS pushes the calipers further out for the 11.5 rotors. You will have to cut and modify this bracket to make it fit.

I will also make sure you know the pads for a IRS car are different because the rear rotors are vented unlike a solid rear.
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Old 07-22-2010, 10:38 PM   #7
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Re: Switching to Cobra IRS!

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The rotors is not the issue. The mounting bracket for the calipers on the IRS pushes the calipers further out for the 11.5 rotors. You will have to cut and modify this bracket to make it fit.

I will also make sure you know the pads for a IRS car are different because the rear rotors are vented unlike a solid rear.
hmmm not sure if I want to be cutting parts from this new rearend. Also one other thing, my V6 still has the stock Y pipe exaust, if I get the addapter for the V8 exaust will that also allow the cobra exaust to work too?
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Old 07-23-2010, 12:28 AM   #8
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Re: Switching to Cobra IRS!

why? why would you do this swap? people with cobras switch to live axels for a reason. seems like alot of work for very little benifit. sure it will ride better, but it wont launch nice
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Old 07-23-2010, 12:41 AM   #9
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Re: Switching to Cobra IRS!

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people with cobras are running 9s and deep 10s on stock halfshafts for a reason. seems like alot of work for a much better ride.
there, fixed it for you.

He has a sixer. He isn't going to snap halfshafts or have problems launching the car. He will, however get to enjoy turning a bumpy corner at speed without feeling the assend kick around.
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Old 07-23-2010, 05:57 PM   #10
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Re: Switching to Cobra IRS!

Do.the fulltiltboogie delrin.bushings and a irs rear brace for sure (amazing difference).
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Old 07-23-2010, 07:22 PM   #11
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Re: Switching to Cobra IRS!

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Do.the fulltiltboogie delrin.bushings and a irs rear brace for sure (amazing difference).
your talking about the aftermarket bracket that fits over the diff cover?
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Old 07-23-2010, 09:39 PM   #12
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Re: Switching to Cobra IRS!

yes, I would highly suggest the IRS brace. One of the first mods that went on my 03 when I got it.
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Old 07-23-2010, 11:10 PM   #13
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Re: Switching to Cobra IRS!

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yes, I would highly suggest the IRS brace. One of the first mods that went on my 03 when I got it.
hows this? BILLETFLOW COBRA & 8.8" IRS BRACE POWDERCOATED RED FIRE: eBay Motors (item 390146734891 end time Aug-20-10 08:45:25 PDT)
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Old 07-24-2010, 04:01 AM   #14
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Re: Switching to Cobra IRS!

Thats THE one to run
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Old 07-25-2010, 01:05 PM   #15
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Re: Switching to Cobra IRS!

they look like they are all pretty much the same. guess its color preference?
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Old 07-25-2010, 02:30 PM   #16
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Re: Switching to Cobra IRS!

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there, fixed it for you.

He has a sixer. He isn't going to snap halfshafts or have problems launching the car. He will, however get to enjoy turning a bumpy corner at speed without feeling the assend kick around.
You have about as many people who can constantly run 9s and 10s on STOCK half shafts as you do sprayed fbodies who can do it on the stock 7.5

Anyway but your right, hes not going to break it with his power, or lack of.
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Old 07-25-2010, 09:40 PM   #17
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Re: Switching to Cobra IRS!

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You have about as many people who can constantly run 9s and 10s on STOCK half shafts as you do sprayed fbodies who can do it on the stock 7.5

Anyway but your right, hes not going to break it with his power, or lack of.
heck even a 4.2L wont be enough to break the half shafts either.
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Old 07-25-2010, 10:04 PM   #18
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Re: Switching to Cobra IRS!

I've made dozens of passes on drag radials on my stock halfshafts with no issues.

Diff brace and springs are the two things that will help you the most. The reason people break halfshafts with lower power levels is they will bind with soft springs on the rear causing them to twist.

With stiff springs or stiffer than stock you shouldn't have any issues. I still won't leave wide open on my car for fear of snapping one, but a 1.7/1.8 60' is no issue. When you do feel it hopping simply let off the gas and problem avoided.
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Old 07-25-2010, 10:58 PM   #19
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Re: Switching to Cobra IRS!

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I've made dozens of passes on drag radials on my stock halfshafts with no issues.

Diff brace and springs are the two things that will help you the most. The reason people break halfshafts with lower power levels is they will bind with soft springs on the rear causing them to twist.

With stiff springs or stiffer than stock you shouldn't have any issues. I still won't leave wide open on my car for fear of snapping one, but a 1.7/1.8 60' is no issue. When you do feel it hopping simply let off the gas and problem avoided.

Wheel hop > halfshafts , But I've seen a car dead hook and tear them apart too. If I had an 03/04 I would go SRA, because F paying for the LV5s
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Old 07-25-2010, 11:07 PM   #20
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Re: Switching to Cobra IRS!

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I've made dozens of passes on drag radials on my stock halfshafts with no issues.

Diff brace and springs are the two things that will help you the most. The reason people break halfshafts with lower power levels is they will bind with soft springs on the rear causing them to twist.

With stiff springs or stiffer than stock you shouldn't have any issues. I still won't leave wide open on my car for fear of snapping one, but a 1.7/1.8 60' is no issue. When you do feel it hopping simply let off the gas and problem avoided.
my best 60' time on my V6 with my old 4.10's was 2.06 seems thats pretty darn good. But Im more into road corses and corning. So drag racing isnt gonna be an issue for me.
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Old 07-25-2010, 11:13 PM   #21
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Re: Switching to Cobra IRS!

Im looking at also getting a Magnaflow cat back for a Cobra, I found this on Ebay for 606.00 buy now or best offer. What kind of offer do you think I would be safe to make?

MagnaFlow Dual Exhaust 00 Ford Mustang Cobra 4.6L IRS: eBay Motors (item 260629067860 end time Jul-31-10 17:52:45 PDT)
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Old 07-26-2010, 10:21 AM   #22
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Re: Switching to Cobra IRS!

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Do.the fulltiltboogie delrin.bushings and a irs rear brace for sure (amazing difference).

Spector, you still run a IRS? I would like to but I don't want the added weight, seems I'll lose a good .5 or 1.0 if I did this, I run consisent 8.2x's in the 1/8 (no 1/4 tracks close to me) but I'm sure I'm in the 12's in the 1/4, what's your thoughts on this, U2 PureVenom.
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Old 07-26-2010, 10:23 AM   #23
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Re: Switching to Cobra IRS!

The IRS is only about 100-150 pounds heavier. That should equate to around .1-.2 decrease in the quarter.

If you're worried about 1/4 times, stick with the solid.
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Old 07-26-2010, 10:28 AM   #24
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Re: Switching to Cobra IRS!

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The IRS is only about 100-150 pounds heavier. That should equate to around .1-.2 decrease in the quarter.

If you're worried about 1/4 times, stick with the solid.
thanks for the heads up on that, I thought (for some reason) it was much more, does the IRS really ride that much better?

is it a real significant difference in the ride and is it worth doing the swap?
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Old 07-26-2010, 10:32 AM   #25
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Re: Switching to Cobra IRS!

Some say yes, some say it's no different. The best way to find out is to ride in one...not just on smooth straight roads, but some bumpy roads and bumpy corners.

I believe there is a night and day different in ride quality. I had a 2000 GT, 2002 GT, and now a 93 fox. Compared to the GT's, the ride in the cobra is much better. No more *** end kicking out on bumps. Everything seems to stay planted.
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Old 07-26-2010, 03:17 PM   #26
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Re: Switching to Cobra IRS!

i have no desire at all what so ever to go to a live axle, I dont plan to ever take my car to the drag strip~ and thats the only reason I would ever even consider a SRA (if I was really into drag racing)
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Old 07-27-2010, 03:39 PM   #27
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Re: Switching to Cobra IRS!

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Some say yes, some say it's no different. The best way to find out is to ride in one...not just on smooth straight roads, but some bumpy roads and bumpy corners.

I believe there is a night and day different in ride quality. I had a 2000 GT, 2002 GT, and now a 93 fox. Compared to the GT's, the ride in the cobra is much better. No more *** end kicking out on bumps. Everything seems to stay planted.
unfortunatly I do know a few people with the IRS cobra's but they refuse to give me a ride. So Im gonna find out for myself.
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Old 07-27-2010, 05:34 PM   #28
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Re: Switching to Cobra IRS!

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unfortunatly I do know a few people with the IRS cobra's but they refuse to give me a ride.
geeeesh, either your an asshat or they are. that sounds so stupid
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Old 07-27-2010, 09:00 PM   #29
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Re: Switching to Cobra IRS!

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geeeesh, either your an asshat or they are. that sounds so stupid
Im as nice as I can be. I have never been for a ride in a V8 Mustang letalone a cobra. But then I also dont like to ask because i dont want to impose.
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Old 07-27-2010, 09:18 PM   #30
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Re: Switching to Cobra IRS!

Where do you live? I'm pretty sure we can at least get you a ride unless you're in the middle of nowhere.
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Old 07-28-2010, 08:44 PM   #31
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Re: Switching to Cobra IRS!

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Where do you live? I'm pretty sure we can at least get you a ride unless you're in the middle of nowhere.
Im in Cleveland Ohio
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Old 07-29-2010, 11:15 AM   #32
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Re: Switching to Cobra IRS!

ask with a $100 dollar bill
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Old 07-29-2010, 11:39 AM   #33
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Re: Switching to Cobra IRS!

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ask with a $100 dollar bill
DAAAAANNMM, is that what you charge Spec??
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Old 07-29-2010, 03:18 PM   #34
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Re: Switching to Cobra IRS!

most people ask me with spit
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Old 07-29-2010, 05:21 PM   #35
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Re: Switching to Cobra IRS!

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most people ask me with spit
that sucks. Btw the IRS came and the guy who used to own the cobra had installed the brace already! So thats less money I have to spend!
There is a slight snag though, the ABS sensors were not on this IRS. Can i simply reuse my originals? Or do I have to buy the cobra ones?
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