tj@steeda

Hi everyone,

We've been extremely busy with product development over here at Steeda - our main focus has been a turn-key wheel hop/IRS subframe solution for the S550 and we hit the nail on the head with our IRS Subframe Bushing Support System!

Made from CNC machined, 6061 aluminum, our bushing support system gives the rear end a much more solid feel with no increase in NVH at all. The Steeda IRS subframe bushings eliminate rear subframe movement notorious in the 2015 Mustang GT, EcoBoost, and V6. A stiffened subframe allows the car to increase traction to the rear wheels and helps eliminate wheel hop.

Our Steeda IRS Subframe Bushing Support System (Part #: 555-4437) is very easy to install with basic hand tools and does not require any permanent modifications to the car.

Steeda Kit Pros:
- Helps reduce wheel hop by eliminating subframe movement, therefore giving you much better rear suspension compliance
- No permanent modifications are necessary
- Easy, 30 minute installation, can be done on jack stands in the garage
- Our kit doesn’t increase NVH at all
- Can be removed or installed in less than 30 minutes
- Completely eliminates over ½” of travel in the factory IRS subframe
- Doesn’t require a rear end alignment
- Lifetime warranty
- Track-tested at the drag strip and the road course - we are not just straight line people

Competitors' Kit Cons:
- They make you replace the factory bushings completely with urethane or solid aluminum
- A complete removal of the IRS subframe is required; this not only takes several hours, but it’s not the easiest job for a 'do it yourselfer'
- Other kits will increase NVH if using solid aluminum bushings or very hard urethane
- Takes hours for installation
- Although other kits may reduce wheel hop, an increase in NVH is not desirable
- You will need to re-align your car if you replace the bushings that locate the rear subframe
- No bushings carry a lifetime warranty, they will fail eventually

I've attached some product photos for reference! Also, this kit is readily available! Steeda's IRS Subframe Bushing Support system greatly reduces wheel hop while virtually eliminating all IRS subframe movement. When these pieces are used in conjunction with our other Steeda rear suspension components, wheel hop and subframe movement is eliminated - stay tuned as these additional rear suspension pieces will be available in the next couple of weeks.

Again, this is not a permanent modification! It can be put back to stock in under an hour as it's very easy to install.

Before and After Comparison:


Installation:


Why IRS subframe movement must be eliminated...

As you can see in the video, when completely stock, the entire rear IRS subframe assembly moves around under acceleration, braking and even more so when bangin’ gears. This is a major problem because every single rear suspension piece is connected to this subframe. So as it’s moving and vibrating, so is the rear sway bar, toe links, integral links, camber arm and lower control arm.

They are all moving around violently as well so it makes it very hard for your suspension to 'work' and keep the tires planted on the pavement for traction. The assembly is basically fighting the car and not allowing for the suspension to work the way it was designed.

This causes unwanted changes in camber and toe which will lead to unpredictable traction and control, resulting in handling issues. Steeda’s simple kit eliminates this. PERIOD.













Best Regards,

TJ

houtex

Very nice!

I'm wondering why Ford bushinged the subframe in the first place, except to get rid of NVH. It makes no sense to me. That's what the bushings in the control arms and such are for!

And it's extra bushings to wear out that simply aren't needed, IMO.

Goofy.

But well done on an elegant solution!

Garbone

TJ, does this raise the ride height, albeit a very small amount?

tj@steeda

Hello Garbone,

No, it does not raise the car at all.

Best Regards,


TJ

houtex

As a followup to that, the spacers are simply shims, replacing 'air' that surrounded the bushings, and was between the subframe and the chassis, as well as the subframe and the bolt. There is no addition to the overall height due to that design by adding the six spacer/shims to this, and it virtually 'locks' the subframe to the chassis instead of it being allowed to float up and down on those bushings.

The overall design and ease of install is what impressed me about it, and that it did the job so effectively too. Aka "it's just *that* simple!"

Of course, the only downside I believe this will produce is added NVH, much like using Urethane bushings in the LCAs potentially do for the S197s. There's a reason Ford did this bushing'd subframe, but it's not to improve handling, it's to isolate the noises.

But a good performing Mustang is not about being a candy-*** and plushy ride. You're doing this for performance, so if it's a little more noisy? Turn up the radio and have a good time!

LQQK

houtex

re: NVH...

We'll see, won't we? I bet there are some reports, but mostly, in comparison to the hoppin'... who the heck will *even* care, right? Right.

SpectreH

Or put louder exhaust on it.