Your thoughts on IRS

[2morrow]

I can tell the difference every time I drive it. Especially when i push it to the limits.

Without the addition of IRS it wouldn't have enjoyed the success it has been experiencing especially in the global market.

 

[vanquishvzla]

I can tell the difference every time I drive it. Especially when i push it to the limits.

Without the addition of IRS it wouldn't have enjoyed the success it has been experiencing especially in the global market.

best mustang color... hands down...

 

[Sivi70980]

One man's aggressive, is another man's trip to the grocery store

GPS aka Time to Beat

 

[Mikthehun1]

GPS aka Time to Beat

Glad I'm not the only one

 

[hlh1]

Per my signature I've had several solid rear axles that were ok, but the first time I drove a S550 I was amazed. The IRS made the Mustang a GT car, instead of a drag car. I can get on the gas in a hard turn with the IRS and keep traction (I know, traction control helps here) and not go out of control sideways like would happen with my 95 Cobra with a Vortech. I always had to be very careful with the throttle on the solid rear cars. Sure, it's fun stepping out with the solid axle but I can hook up and go with my 19GT.

 

[8GTOKLR]

OP:

Stock Sloppy Solid vs IRS...The Solid is better

2000 Trans Am Owned
2003 Cobra Owned
2002 M5 Owned

 

[Mikthehun1]

OP:

Stock Sloppy Solid vs IRS...The Solid is better

2000 Trans Am Owned
2003 Cobra Owned

At what exactly?

 

[Dr. Norts]

At what exactly?

Handling like a bag of hammers.

 

[Mikthehun1]

Handling like a bag of hammers.

Sir, that's an insult to well balanced hammers everywhere

 

[8GTOKLR]

At what exactly?

The solid has less moving slush than the IRS. Mounting points, pivot points etc...

Count it out when you watch any video of the S550 by an aftermarket company showing the IRS deflection

Subframe mounting (4)
Upper and lower crtl arms both sides(8)
diff mounts (4)
Verical links (2)

Thats 18 areas of slop. oops dont forget toe links thats 20

 

[Norm Peterson]

Per my signature I've had several solid rear axles that were ok, but the first time I drove a S550 I was amazed. The IRS made the Mustang a GT car, instead of a drag car. I can get on the gas in a hard turn with the IRS and keep traction (I know, traction control helps here) and not go out of control sideways like would happen with my 95 Cobra with a Vortech. I always had to be very careful with the throttle on the solid rear cars. Sure, it's fun stepping out with the solid axle but I can hook up and go with my 19GT.

The S197 Mustang's stick-axle suspension underwent major handling improvement over the triangulated 4-link suspensions used on the Fox/SN95/New Edge Mustangs that preceded it. Those earlier Mustangs were known for snap-oversteer.

The S197 probably represented as much improvement over the Fox (Fairmont)-based 4-link as people are saying the S550's IRS has over the S197. Maybe even more improvement.


Norm

 

[Mikthehun1]

The solid has less moving slush than the IRS. Mounting points, pivot points etc...

Count it out when you watch any video of the S550 by an aftermarket company showing the IRS deflection

Subframe mounting (4)
Upper and lower crtl arms both sides(8)
diff mounts (4)
Verical links (2)

Thats 18 areas of slop. oops dont forget toe links thats 20

 

[edco]

Interesting thread. I rural road surf and safari. Handling/suspension is more important than power to me. Bought the '17 V6 just to experience the IRS. No comparison in stock trim, the S550 is better. However, the '07 GT is handling modified over a four year quest. It is very good and IMO better than the ‘17 IRS pony in stock trim.

2007 GT
After-market mods: Caster camber plates, KYB GR2 shocks and struts, 1.2" lower springs, Steeda upper 3rd link, rear control arm relocation brackets, adjustable rear control arms, Detroit true track helical diff, Center Force dual friction clutch, Fays2 Watts link, Steeda G-Track front brace, Eibach sway bars, Ford racing strut tower brace, GT 500 front control arms, Baer Front brakes, Coast 4" dia. one piece aluminum drive shaft, Ford Racing 3.73 rear gears, Steeda X-Brace. HR 1" Track Spacers, P275/40R18 all four corners.

It took time to get the roll center, alignment, camber angle, pinion angle, and Watts link tuned. It was worth it. With Tremec 3650 trans on extreme climb/dive/turn E. MO hills the GT corners and runs with the best German cars and a Maserati.

2017 V6
On the S550, I spent no where near as much to tune the handling. The S550 is just a better chassis over S197. S550 Mods: Steeda: IRS Sub-Frame Braces, Extreme K-Member G-Trac Brace, Adjustable rear toe-links, Billet vertical Links, Caster camber plates, Billet rear shock mount. Then, H&R 24 mm wheel spacers. Eichbach sway bars. Bilstein shocks and struts. Under $3K mods total. I run the stock wheels and tire size. If you can afford the mods, buy them. Steeda engineering works! After mods the car feels like a different car. The tires sound different. Everything is more precise and tight, with great feedback and response. Best handling car I own.

 

[Sivi70980]

OP:

Stock Sloppy Solid vs IRS...The Solid is better

2000 Trans Am Owned
2003 Cobra Owned
2002 M5 Owned

Pretty sure lap times at tracks around the world disagree with this.

 

[obgod3]

I dont know how someone cant tell the difference but I am sure it an happen also. My 19 vs my buddy’s 13 Boss 302….my 19 all day long. The boss is amazing and super fun to drive but Ill take the IRS all day long. I had a 83 GT and a 89 LX 5.0 and frankly I would never compare those to the new mustangs at all.