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Old 09-02-2011, 06:57 PM   #1
Soldier GT
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Default Advantages/ Disadvantages of IRS..

Hey all.. Got alot of plans/hopes/dreams this winter for the stang and one of them is maybe installing a IRS. I was just wondering what you guys thought about it. Is it worth the money? Any input would be much appreciated!
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Old 09-02-2011, 09:19 PM   #2
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Awesome if you want to carve corners... You will have to do some upgrading to not tear **** up with your power if you put a sticky tire on it and launch hard.

Money shouldn't be to bad as you can usually find a trade for a Cobra guy wanting a SRA for drag racing. Take your time and find the right deal.
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Old 09-02-2011, 10:26 PM   #3
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Soldier one of my goals in life is to buy this car from you. Adding an IRS would decrease my offer price 98%.

Cmon my man!!!!!!
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Old 09-03-2011, 12:13 AM   #4
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Do the switch! The sra only advantage of the sra is its better to launch with. So unless you go to the track all the time why not switch? It rides much better and with a good set of springs and shocks/struts it'll handle like its on rails too.
No reason not to switch in my opinion.
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Old 09-03-2011, 09:17 AM   #5
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http://www.svtperformance.com/forums/member.php?u=9457

03 Cobra - Sonic Blue
KB 2.8H, 6spd, IRS "stock halfshafts"
9.82@139
1.47 60ft
6.32@111.26 1/8th

This is a member's signature over on SVTP. IRS's launch just fine and when setup correctly they have a much reduced chance of breakage.

Anyways, as we've talked about before, the swap is definitely worth it! Handling and ride STOCK are worlds better, and any modification to it the better the ride and handling gets(save for lowering springs, they make it handle better but harsher ride...COILOVERS FTW!). As with any suspension style, they can be upgraded. Bushings and springs(if you get an 03 cobra IRS with stock bilsteins) goes a LONG way. If youre ever up in PA or northern MD, give me a shout. I'll take you for a spin in my car. You'll see why I made the swap real quick.

I definitely would not say that I got 5th place at the MW auto-x on driver skill. Especially since it was the first time I ever did it.
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Saying there is a 1whp difference between the X and H and trying to justify it as a performance difference, is like walking 100 feet to your car and eating a cheeseburger while saying its fine because you just did "cardio".
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Old 09-03-2011, 10:06 AM   #6
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soldier, when you do this swap, go ahead and get all the little things bracing wise. like i have the mm flsfc, lower torque box braces, rear irs braces, diff brace, and the irs already had poly bushings and 373s withe h&r race springs. i have had zero wheel hop running 315 nt05 and a i/c vortech. i really like mine but i havent been able to drive the car much. like teej said, the ride and handling is much better plus polished tail pipes with the irs look awsome! good luck with which ever route you take!
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Old 09-03-2011, 11:45 AM   #7
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Quote:
Originally Posted by teej281 View Post
http://www.svtperformance.com/forums/member.php?u=9457

03 Cobra - Sonic Blue
KB 2.8H, 6spd, IRS "stock halfshafts"
9.82@139
1.47 60ft
6.32@111.26 1/8th

This is a member's signature over on SVTP. IRS's launch just fine and when setup correctly they have a much reduced chance of breakage.
. The sad thing is he is pulling the irs out this winter and going sra. The only disadvantage to an irs is it is expensive to completely build it.
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Old 09-03-2011, 11:48 AM   #8
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Yea, buying a brace or an actual supportive cover for the diff is a good idea as well. The cover is better as the brace in my mind is just a band-aid. Get some real support there and you'll be good.

And +1947475893490378458 to the polished tailpipes...sexy sexy!

Evan, yea. It sucks that he is swapping out the IRS for the SRA. I mean when there is nothing else you can do to your setup short of adding more power to go faster than go to an SRA, than I guess thats what you have to do! His car is going to go faster, but when you're deep into the 9's, anything faster is really an accomplishment.
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Saying there is a 1whp difference between the X and H and trying to justify it as a performance difference, is like walking 100 feet to your car and eating a cheeseburger while saying its fine because you just did "cardio".

Last edited by teej281; 09-03-2011 at 12:04 PM.
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Old 09-03-2011, 12:44 PM   #9
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Depends on what you want out of it. Stock SRA vs stock IRS, the IRS will ride nicer for you. Ford's IRS isn't the best design for one. If you are thinking of performance handling, I'd go with a properly built 5 link from Steeda instead. After looking into it for myself, the 5 link will out perform the IRS swap.
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Old 09-03-2011, 01:06 PM   #10
teej281
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Tell that to the cobra r guys

Spirited street car, you cant beat an IRS. Modify the IRS with bushings and the ride and handling gets worlds better, as well as launching and being able to put the power down.
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Saying there is a 1whp difference between the X and H and trying to justify it as a performance difference, is like walking 100 feet to your car and eating a cheeseburger while saying its fine because you just did "cardio".
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Old 09-03-2011, 01:06 PM
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