Go Back   MustangForums.com > Ford Mustang Tech > 4.6L (1996-2004 Modular) Mustang > 4.6L General Discussion
Sign in using an external account
Register Forgot Password?
Search


4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Advantages/ Disadvantages of IRS..

Reply
 
 
 
 
Thread Tools Search this Thread
Old 09-10-2011, 11:16 PM   #41
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

Quote:
Originally Posted by LilRoush View Post
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.
Maximum Motorsports torque arm is better than the 5 link all day IMO. IRS FTW though.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-11-2011, 08:21 AM   #42
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

Quote:
Originally Posted by sn95_331_GT_ yellow View Post
my car will be getting IRS for the simple reason that a proper ROAD RACE IRS will be a lot lighter than the equivalent SRA combo

my car will be going up against C6 vettes, and a bunch of Ferrari's, BMW's, and S2000's at the open track days i go to, and i need my car to be as light as possible, since im only working with ~300rwhp

one day ill have the front setup as Jazzer and ill be uber happy!!!!!!!!
I am sorry to say that your car will be HEAVIER with an IRS It will have less "sprung weight" but not less weight overall.

BTW... my car will handle every bit as well as a Corvette, and better in a lot of cases, depending on the spring/shock set-up, as there are LOTS of different models out there. Not picking on you, sn95_331_GT_ yellow, but the consensus seems to be that an IRS in the Mustang is automatically a better handling suspension. The fastest open track Mustangs on the planet have no issues running a stick-axle.

There are certainly advantages to running the IRS, and many have found at least one or two that work for him/her and is great. I am not here to bash the IRS, just help to ensure that the SRA not get thrown under the bus as some old school, antiquated and behind the times suspension that cannot compete on the AX or open-track

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 09-11-2011, 10:00 AM   #43
H0SS302
6th Gear Member
 
H0SS302's Avatar
 
Join Date: Oct 2006
Vehicle: '88 LX Hatch
Location: Texas
Posts: 10,539
Default

Quote:
Originally Posted by Jazzer The Cat View Post
You pepes can talk about ride quality and that is great (honestly!), but I will put my car with an SRA up against ANY IRS Mustang and will have no issues competing with it on an open-track environment. My ONLY downside at the moment is HP and have plans in the making currently.

Let's not get carried away here pepes

You have spent TONS of money on your SRA making it into a quality car... I have spent....ZERO.... making my car get to the point of a basic TA/PHB set up'ed SRA...Your car BETTER be able to whoop some *** on a track lol.

on a lighter note..

For the general enthusiast, you cant beat a swap for the rear end...if and only if you do some kind of trade. If your buying an IRS outright, there really is no cost savings there. An SRA with a TA and watts link or PHB will launch a hell of a lot better and...not break lol. The only downside is the ride.
H0SS302 is offline   Reply With Quote
Old 09-11-2011, 10:51 AM   #44
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

^ agreed
Jazzer The Cat is offline   Reply With Quote
Old 09-11-2011, 04:27 PM   #45
sn95_331_GT_ yellow
5th Gear Member
 
sn95_331_GT_ yellow's Avatar
 
Join Date: Mar 2008
Vehicle: 98 Bucket
Location: CT
Posts: 2,394
http://www.facebook.com/profile.php?id=124700115
Default

Quote:
Originally Posted by Jazzer The Cat View Post
I am sorry to say that your car will be HEAVIER with an IRS It will have less "sprung weight" but not less weight overall.

BTW... my car will handle every bit as well as a Corvette, and better in a lot of cases, depending on the spring/shock set-up, as there are LOTS of different models out there. Not picking on you, sn95_331_GT_ yellow, but the consensus seems to be that an IRS in the Mustang is automatically a better handling suspension. The fastest open track Mustangs on the planet have no issues running a stick-axle.

There are certainly advantages to running the IRS, and many have found at least one or two that work for him/her and is great. I am not here to bash the IRS, just help to ensure that the SRA not get thrown under the bus as some old school, antiquated and behind the times suspension that cannot compete on the AX or open-track

Jazzer
not saying itll be the end all setup, but it will be nice than the stock one i have now, and i just like the idea of being a little bit different honestly

i know an SRA can rock but its just not my cup of tea right now
__________________
1996 GTS 5spd 3060lbs
PI heads, COMP 270's, LT's, OR X, Bassani, 9.5lb aluminum flywheel, SPEC stg4 clutch, 4.10's, MGW, FRPP DS, 30#, 255lph, BBK 78mm TB, K&N, Weld fat n' skinnies, BFG DR's, power nothing, cage, 5 pts, Corbeau's, and some other stuff

sn95_331_GT_ yellow is offline   Reply With Quote
Old 09-11-2011, 05:21 PM   #46
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

i wonder what the actual weight difference between a fully build SRA with torque arm and watts link and a built IRS actually is.
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-11-2011, 05:40 PM   #47
zinsavage123
1st Gear Member
 
zinsavage123's Avatar
 
Join Date: May 2009
Vehicle: 2001 mustang gt
Location: maryland
Posts: 140
Send a message via Yahoo to zinsavage123
Default

is the 31spline/cobra rear conversion in our gt's considered IRS??
__________________
2001 Mustang GT - weekend warrior, mods in garage
2001 Focus ZX3 - bolt-on dd
zinsavage123 is offline   Reply With Quote
Old 09-11-2011, 05:51 PM   #48
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

^ Good question....

The SRA will pick up some weight for sure, as the UCA's are the only thing removed and certainly don't weigh nearly as much as a PHB or WL with TA.

The one big thing of which I don't know, in regards to the IRS, would be the RC. My guess is it would be the center of the pumpkin, as it is stationary. Interesting thread, to be sure

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 09-11-2011, 05:52 PM   #49
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

Quote:
Originally Posted by zinsavage123 View Post
is the 31spline/cobra rear conversion in our gt's considered IRS??

If you put a '99~'04 Cobra rear-end in your car, it is most certainly IRS
Jazzer The Cat is offline   Reply With Quote
Old 09-11-2011, 06:18 PM   #50
stangalator
4th Gear Member
 
stangalator's Avatar
 
Join Date: Apr 2008
Vehicle: 1997 Mustang GT
Location: New York
Posts: 1,306
Send a message via AIM to stangalator
Default

Quote:
Originally Posted by Jazzer The Cat View Post
^ Good question....

The SRA will pick up some weight for sure, as the UCA's are the only thing removed and certainly don't weigh nearly as much as a PHB or WL with TA.

The one big thing of which I don't know, in regards to the IRS, would be the RC. My guess is it would be the center of the pumpkin, as it is stationary. Interesting thread, to be sure

Jazzer

edit:
looks quite low from this
post #14 for lower 1"IRS (.98")
post #23 for stock height IRS (2.39")
http://forums.corral.net/forums/road...live-axle.html
__________________
Race car driving is alot like sex, every guy thinks hes good at it.

http://www.newyorkmustangs.com/forum...95-t22305.html
^INSTALLED: FULL TILT BOOGIE IRS ^
306.x/298.x
13.41@104.76 (pre-cams and tune)

Last edited by stangalator; 09-11-2011 at 06:35 PM.
stangalator is offline   Reply With Quote
Old 09-11-2011, 07:05 PM   #51
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

Quote:
Originally Posted by Jazzer The Cat View Post
^ Good question....

The SRA will pick up some weight for sure, as the UCA's are the only thing removed and certainly don't weigh nearly as much as a PHB or WL with TA.

The one big thing of which I don't know, in regards to the IRS, would be the RC. My guess is it would be the center of the pumpkin, as it is stationary. Interesting thread, to be sure

Jazzer
if someone weighed it that would rock. you wont pick up any weight upgrading the IRS except for the weight of the brace but the SRA would pick up quite a bit of weight.
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-11-2011, 07:24 PM   #52
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

The difference in weight is 75lbs, as measured by a guy in the link posted by stangalator. This is consistant with what I have heard over the years. BUT.... much of that weight is no longer sprung, so the springs/shocks don't have to work soo hard to control it. This is a big advantage and should not be under estimated.

I would agree that much of the weight gained with building an IRS would be the brace. I doubt that upgrading axles, going CO's and improved bushings would make much difference either way.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 09-11-2011, 07:39 PM   #53
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

Quote:
Originally Posted by Jazzer The Cat View Post
The difference in weight is 75lbs, as measured by a guy in the link posted by stangalator. This is consistant with what I have heard over the years. BUT.... much of that weight is no longer sprung, so the springs/shocks don't have to work soo hard to control it. This is a big advantage and should not be under estimated.

I would agree that much of the weight gained with building an IRS would be the brace. I doubt that upgrading axles, going CO's and improved bushings would make much difference either way.

Jazzer
is that weight difference with the dogbone removed from the SRA?
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-12-2011, 06:01 AM   #54
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

I don't know where the extra weight is concentrated, but the IRS has a set of twin-"A" arms (not sure of their specific names) and is probably most of it. The dogbone is probably only a couple pounds, never weighed one.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 09-12-2011, 09:20 AM   #55
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

another thing about the IRS is you can adjust camber and toe in if you wanted to
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-12-2011, 09:34 AM   #56
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

This is a plus for a hardcore road/track dood/doodette

Griggs racing adds neg. camber to their SRA's, via some custom welding work on the ends of the axle. I had actually debated doing this myself, but have more rear grip that I could have ever imagined.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 09-12-2011, 04:40 PM   #57
stangalator
4th Gear Member
 
stangalator's Avatar
 
Join Date: Apr 2008
Vehicle: 1997 Mustang GT
Location: New York
Posts: 1,306
Send a message via AIM to stangalator
Default

Quote:
Originally Posted by Jazzer The Cat View Post
Griggs racing adds neg. camber to their SRA's, via some custom welding work on the ends of the axle.
Jazzer
How can you add camber to a SRA via welding the end of the axle housing? seems like the differential would have to be custom to aim the axles upward a little to get that to work right?
__________________
Race car driving is alot like sex, every guy thinks hes good at it.

http://www.newyorkmustangs.com/forum...95-t22305.html
^INSTALLED: FULL TILT BOOGIE IRS ^
306.x/298.x
13.41@104.76 (pre-cams and tune)
stangalator is offline   Reply With Quote
Old 09-12-2011, 04:44 PM   #58
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

Quote:
Originally Posted by stangalator View Post
How can you add camber to a SRA via welding the end of the axle housing? seems like the differential would have to be custom to aim the axles upward a little to get that to work right?
it can be done, just costs more than you could buy an IRS for.
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-12-2011, 05:01 PM   #59
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

Quote:
Originally Posted by stangalator View Post
How can you add camber to a SRA via welding the end of the axle housing? seems like the differential would have to be custom to aim the axles upward a little to get that to work right?
They cut-off the ends of the axle tubes and move it upward like 3/4" or so. Just enough to avoid the axle itself from hitting the top/inside of the tubes. Weld up the openings on the top/bottom of the tubes and vwallah.... er, walla.... viola I can't spell voilą, dammit! You've now got like 1* of neg camber out back

Jązzer
Jazzer The Cat is offline   Reply With Quote
Old 09-12-2011, 05:19 PM   #60
turbo232
4th Gear Member
 
turbo232's Avatar
 
Join Date: Mar 2010
Vehicle: 2004 Mustang
Location: GA
Posts: 1,187
Default

Quote:
Originally Posted by Jazzer The Cat View Post
They cut-off the ends of the axle tubes and move it upward like 3/4" or so. Just enough to avoid the axle itself from hitting the top/inside of the tubes. Weld up the openings on the top/bottom of the tubes and vwallah.... er, walla.... viola I can't spell voilą, dammit! You've now got like 1* of neg camber out back

Jązzer
wouldnt that make it weaker though?
__________________
former 02 Turbo V6 Mustang 276 rwhp and 299 lb-ft torque. SOLD....then TOTALED.
current 04 GT Vert too slow.
242 rwhp and 253 lb-ft torque with new intake manifold
10 guns owned = 0 shooting sprees.
2011 Subaru Impreza replaced the GT.

turbo232 is offline   Reply With Quote
Old 09-12-2011, 05:19 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
01, 2003, 31, advantages, cobra, difference, disadvantages, downsides, gt, identify, irs, mustang, official, spline, sra, weight, wheelie, winter

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 08:03 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup