Cobra IRS?

mustang_gtr_99 · March 20th, 2009, 01:33 AM

I found a guy with an 04 cobra who want to swap me his IRS for my solid axel set up. I am thinking it is worth it because I am all about cornering performance but it is a lot of work. What do you all think?

Diabeetus · March 20th, 2009, 01:41 AM

You can out handle an IRS car with a good setup from Maximum or Steeda, but the IRS does make for a nice ride. Stock for stock Id consider the IRS and upgrade for you so if its a straight trade I say do it. Be aware that if you take his cobra rear brakes you have to run at least a 16 inch rim. Also you're gonna have to take his shocks as well. Disconnect your ABS sensors underneath the rear seat and just take his and plug them in. Its a straight swap, pretty straight forward. PM me if you need anything else.

mustang_gtr_99 · March 20th, 2009, 01:47 AM

I have 18" rims so no problem there. I also was about to get the steeda 5 link...hmmmmm The IRS would come at no cost but I am going to need the best cornering equipment out there for what I am doing.

njstang · March 20th, 2009, 01:47 AM

im not a fan of IRS but im more of a straight line kinda guy rather then getting in the twisties, but cobra IRS in a gt will give you some nasty rep points

mustang_gtr_99 · March 20th, 2009, 01:49 AM

Its kinda hard to call my car a gt anymore with the engine swap and mods, lol

Lefty · March 20th, 2009, 12:45 PM

Are you wanting to do twisties or hit the drag strip?

foursixblurrrr03 · March 20th, 2009, 02:09 PM

he already said he wants to hit the twisties. i'd say go for it, it's better than our solid axel and it would be really cool to see done

Lefty · March 20th, 2009, 02:50 PM

If you love the drag strip then stick w/ the solid but if not then yes do it. It's better ride quality and great for road twisties

mustang_gtr_99 · March 20th, 2009, 07:50 PM

Yah, I am not a 1/4 guy, I like the circuit racing. So add one more thing to my list, lol. Now I have to look into IRS upgrades.

Diabeetus · March 20th, 2009, 09:41 PM

IRS upgrades are expensive! They are also labor intensive. Just about any modification requires takin the whole friggen thing apart. If you want to do competitive road racing then Id go with the 5 link from Steeda. Its also lighter then the IRS. I swapped my IRS for a solid cause Im a drag racer.

99mustanggtman · March 20th, 2009, 11:22 PM

I don't know why the IRS gets such a bad rap at the track, throw on a brace and some sticky tires and they cut 1.5/1.6 60fts all day. The reason you rear about people snapping axles on the IRS is because of the shock from wheel hop, run a sticky enough tire and its no problem. There's plenty of low 10 second guys and even high 9 second Terminator guys running with just a brace a sticky tire.

The only real disadvantage I can see with the IRS is the extra weight over the SRA. Roughly 80lbs more.

mustang_gtr_99 · March 21st, 2009, 12:34 AM

ouch, I dont think I want that then. I just took abut 80lbs off the fron end

spdfrek · March 21st, 2009, 11:58 AM

It's 80lbs heavier, but less unsuspended weight too. I have one in my project car. I plan on doing a full upgrade of all the bushings. From the reading I've done getting rid of all the rubber in the IRS will get rid of 99% of the wheel hop thats there, and improve handling by a large margin.

If your still not wanting the extra 80lbs (which does help give you a better weight balance) then I'd also recommend looking at the maximum motor sports rear suspension setup over the steeda.

Interesting enough if you call maximum motor sports, they are pretty excited about setting up IRS stuff, and say they can make it work as good or better then a solid axle. If you call grigg's, they will tell you not to bother with the IRS and to keep a solid axle.

I chose the IRS because I wanted to be a bit different, and because the roads around here are not the best, so an IRS will give a better ride. I've been told on rough drag strips the IRS will also hook up better then a solid axle because it can conform to the surface better.

mustang_gtr_99 · March 21st, 2009, 01:43 PM

Thanks for the info. I think I will keep my solid rear and go with steeda like I have always planed. New edge mustangs weigh enough as is without adding more.

Diabeetus · March 22nd, 2009, 04:42 AM

Originally Posted by mustang_gtr_99

Thanks for the info. I think I will keep my solid rear and go with steeda like I have always planed. New edge mustangs weigh enough as is without adding more.

Good plan.

Lefty · March 22nd, 2009, 07:10 PM

Originally Posted by 99mustanggtman

I don't know why the IRS gets such a bad rap at the track, throw on a brace and some sticky tires and they cut 1.5/1.6 60fts all day. The reason you rear about people snapping axles on the IRS is because of the shock from wheel hop, run a sticky enough tire and its no problem. There's plenty of low 10 second guys and even high 9 second Terminator guys running with just a brace a sticky tire.

The only real disadvantage I can see with the IRS is the extra weight over the SRA. Roughly 80lbs more.

+1. The IRS can, and it has been proven, to be built very, very well. It's just not cheap

NeverEnuff · March 23rd, 2009, 11:16 AM

Originally Posted by 99mustanggtman

I don't know why the IRS gets such a bad rap at the track, throw on a brace and some sticky tires and they cut 1.5/1.6 60fts all day. The reason you rear about people snapping axles on the IRS is because of the shock from wheel hop, run a sticky enough tire and its no problem. There's plenty of low 10 second guys and even high 9 second Terminator guys running with just a brace a sticky tire.

The only real disadvantage I can see with the IRS is the extra weight over the SRA. Roughly 80lbs more.

Don't defend the IRS here...you will get into trouble....

NeverEnuff · March 23rd, 2009, 11:22 AM

Originally Posted by Lefty

+1. The IRS can, and it has been proven, to be built very, very well. It's just not cheap

Its not much more than a solid. Figure it up. For a solid to hit some good 1.5-1.6 60fts...you need.

-Upper/lower control arms 300-400
-31 spline posi 200-300
-31 axles 250-300
-Springs 200
-Gears -wash
-Stickey tires
-total without wash prices-950-1200

01/03/04 IRS.
-Brace 160
-Gears -wash
-Sticky tires -wash
-total without wash- 160

99 IRS
-Brace -160
-Gears -wash
-31 posi 200-300
-01/03/04 axles 700-800
total without wash 1060-1260

The prices don't favor the SRA unless you have a 99 IRS. Other than that...why would not want ride quality and hook on the street for a price cheaper than building the solid....???

I have a total of 700 bucks in my 03/04 IRS right now. All new bushings, MM tie rods, MM spindle bushings, the works. Stock axles, and posi with 3.55 gears.

WHen I traded my axle for this setup, I traded it with about 800-1000 bucks worth of goodies already in it. Eaton posi, gears, axles, HPM upper and lowers with springs.

Lefty · March 23rd, 2009, 11:23 AM

Ok well all I can say is.............

I wuv my IRS

NeverEnuff · March 23rd, 2009, 11:24 AM

Originally Posted by Lefty

Ok well all I can say is.............

I wuv my IRS

My too. ha!

March 20th, 2009, 01:33 AM	#1
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	Cobra IRS? I found a guy with an 04 cobra who want to swap me his IRS for my solid axel set up. I am thinking it is worth it because I am all about cornering performance but it is a lot of work. What do you all think? __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 20th, 2009, 01:41 AM	#2
Diabeetus Regular Black 2001 Cobra Join Date: Jul 2008 Location: Las Vegas Posts: 343 iTrader: 2 reviews	You can out handle an IRS car with a good setup from Maximum or Steeda, but the IRS does make for a nice ride. Stock for stock Id consider the IRS and upgrade for you so if its a straight trade I say do it. Be aware that if you take his cobra rear brakes you have to run at least a 16 inch rim. Also you're gonna have to take his shocks as well. Disconnect your ABS sensors underneath the rear seat and just take his and plug them in. Its a straight swap, pretty straight forward. PM me if you need anything else. __________________ Black 2001 SVT Cobra Solid axle "Good judgment comes from experience, experience comes from bad jugment" MM Cobra Club Member #1

March 20th, 2009, 01:47 AM	#3
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	I have 18" rims so no problem there. I also was about to get the steeda 5 link...hmmmmm The IRS would come at no cost but I am going to need the best cornering equipment out there for what I am doing. __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 20th, 2009, 01:49 AM	#5
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	Its kinda hard to call my car a gt anymore with the engine swap and mods, lol __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 20th, 2009, 12:45 PM	#6
Lefty Resident DJ '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 28,699 iTrader: 12 reviews	Are you wanting to do twisties or hit the drag strip? __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

March 20th, 2009, 02:50 PM	#8
Lefty Resident DJ '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 28,699 iTrader: 12 reviews	If you love the drag strip then stick w/ the solid but if not then yes do it. It's better ride quality and great for road twisties __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

March 20th, 2009, 07:50 PM	#9
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	Yah, I am not a 1/4 guy, I like the circuit racing. So add one more thing to my list, lol. Now I have to look into IRS upgrades. __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 20th, 2009, 09:41 PM	#10
Diabeetus Regular Black 2001 Cobra Join Date: Jul 2008 Location: Las Vegas Posts: 343 iTrader: 2 reviews	IRS upgrades are expensive! They are also labor intensive. Just about any modification requires takin the whole friggen thing apart. If you want to do competitive road racing then Id go with the 5 link from Steeda. Its also lighter then the IRS. I swapped my IRS for a solid cause Im a drag racer. __________________ Black 2001 SVT Cobra Solid axle "Good judgment comes from experience, experience comes from bad jugment" MM Cobra Club Member #1

March 20th, 2009, 11:22 PM	#11
99mustanggtman Hardcore Enthusiast 1999 GT Join Date: Feb 2007 Location: Germantown, MD/ OSU Posts: 1,835 iTrader: 7 reviews	I don't know why the IRS gets such a bad rap at the track, throw on a brace and some sticky tires and they cut 1.5/1.6 60fts all day. The reason you rear about people snapping axles on the IRS is because of the shock from wheel hop, run a sticky enough tire and its no problem. There's plenty of low 10 second guys and even high 9 second Terminator guys running with just a brace a sticky tire. The only real disadvantage I can see with the IRS is the extra weight over the SRA. Roughly 80lbs more. __________________ Single 67mm turbo, ported pi heads, edelbrock vic jr. manifold w/HPP plenum, terminator shortblock, return fuel system... Goal 600+ rwhp.

March 21st, 2009, 12:34 AM	#12
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	ouch, I dont think I want that then. I just took abut 80lbs off the fron end __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 21st, 2009, 11:58 AM	#13
spdfrek Regular Join Date: Nov 2007 Posts: 111 iTrader: 2 reviews	It's 80lbs heavier, but less unsuspended weight too. I have one in my project car. I plan on doing a full upgrade of all the bushings. From the reading I've done getting rid of all the rubber in the IRS will get rid of 99% of the wheel hop thats there, and improve handling by a large margin. If your still not wanting the extra 80lbs (which does help give you a better weight balance) then I'd also recommend looking at the maximum motor sports rear suspension setup over the steeda. Interesting enough if you call maximum motor sports, they are pretty excited about setting up IRS stuff, and say they can make it work as good or better then a solid axle. If you call grigg's, they will tell you not to bother with the IRS and to keep a solid axle. I chose the IRS because I wanted to be a bit different, and because the roads around here are not the best, so an IRS will give a better ride. I've been told on rough drag strips the IRS will also hook up better then a solid axle because it can conform to the surface better.

March 21st, 2009, 01:43 PM	#14
mustang_gtr_99 Hardcore Enthusiast 1999 3V GT/2007 GT D/D corner carver Join Date: Feb 2009 Location: Eugene, Oregon Posts: 2,730 iTrader: 2 reviews	Thanks for the info. I think I will keep my solid rear and go with steeda like I have always planed. New edge mustangs weigh enough as is without adding more. __________________ OS2 (SW) USN REAR SEAT DELETE FABRICATOR "RSD pics in garage" 99 3V GT/2007 GT DD

March 23rd, 2009, 11:23 AM	#19
Lefty Resident DJ '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 28,699 iTrader: 12 reviews	Ok well all I can say is............. I wuv my IRS __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

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