Adding some compliance & softness back in

[BMR Tech]

I feel with the diff bushes removed and having PS4S the ride quality is now spot on, car does have much better compliance and ride comfort.

Diff bushings / inserts definitely aren't for everyone, I am not surprised to see you type that.

That said, I do not mind mine. The poly insert / lockout kits on the market do provide many benefits for those with increased power levels and those who abuse their S550s regularly.

They minimize parts breakage and premature failure of driveline and supporting components by massively reducing driveline movement under load.

In many cases, they help with driveline vibrations by reducing pinion rise and providing better working angles within the driveline.

They help prevent premature diff bushing failure by reducing the loads on the rubber bushings....which is becoming more and more common. I am getting many people contact me about split/cracked OE diff bushings.

And of course the performance benefit as we all know.

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[Gibbo205]

Diff bushings / inserts definitely aren't for everyone, I am not surprised to see you type that.

That said, I do not mind mine. The poly insert / lockout kits on the market do provide many benefits for those with increased power levels and those who abuse their S550s regularly.

They minimize parts breakage and premature failure of driveline and supporting components by massively reducing driveline movement under load.

In many cases, they help with driveline vibrations by reducing pinion rise and providing better working angles within the driveline.

They help prevent premature diff bushing failure by reducing the loads on the rubber bushings....which is becoming more and more common. I am getting many people contact me about split/cracked OE diff bushings.

And of course the performance benefit as we all know.

Kelly

Completely get your points 100%

Therefore would it not make sense for a vendor to make a softer polyurethane bush, essentially a version that just helps to prolong the life of stock bushes and is designed to limit movement but is like a comfort edition, so something softer than the current say Steeda red inserts.

Of course softer you go the less effective it will be for performance but even a really soft variant would still help limit movement as it after all filling the voids in the stock bushes.

I've done similar on my E46 M3 but used powerflex polyurethane bushing inserts which are certainly softer than the ones currently available for Mustang though I've not checked out Powerflex offerings for Mustang. On my E46 M3 I witnessed zero NVH gains or clunks/thuds it is completely spot on but you can feel the extra handling balance when pushing beyond the limits or drifting.

I think the Mustang could do with more performance upgrades which are off a softer nature, just like you did with your Performance Springs which is no doubt why they are so popular. Many people like myself just want to make the car the best it can be for street driving, so want any extra performance they can get without making it ride super stuff, or increasing NVH.

Essentially like a performance comfort range of parts, just maybe do not call them comfort. ;)

 

[IvanCRF]

Maintaining ride comfort was a goal of mine too until I sheared a diff bolt with diff inserts. After the laborious repair process, I vowed to never shear a diff bolt again. I gained peace of mind with solid aluminum diff bushings and sacrificed comfort.

 

[Norm Peterson]

Essentially like a performance comfort range of parts, just maybe do not call them comfort. ;)

I think the term you're looking for would be "performance street", where inclusion of the word 'street' implies compromises down from "track performance". IOW, "softer" in both rate and intent. More along the lines of how brake pads from some mfrs with the full lineup from street to high-level track applications are currently described.

The trick would be getting people to accurately identify their needs and buy to suit those rather than chase starry-eyed wants.


Norm

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