Foundry on PP Car - Disadvantages?

[Binfordtools]

I have loved the 20" Foundry wheels since I first saw them. My 2017 PP car came with 19" wheels that are a massive pain in the ass to wash, and I'm not in love with the way they look. I was considering buying a used set of Foundry wheels for my PP car. Obviously the PP car suspension is tuned for the 19" wheels, but, if I were to change to Foundry wheels are there any major disadvantages in handling/ride/performance?

Thanks for the information

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[twistedoctane]

I’ve got the 18” foundry option and they’re a breeze to clean, but I imagine you’d have a challenge clearing the PP brakes off the top of my head.

 

[ForTehNguyen]

they may not fit over the perf packs 6 piston calipers

 

[Binfordtools]

they may not fit over the perf packs 6 piston calipers

That much I have been able to find. They do fit the factory Brembo's.

 

[Grintch]

I assume you mean the 20x9 optional wheels?

Heavier and narrower in back. Rougher ride and less grip from the fashionably thin sidewalls.

 

[kz]

I have loved the 20" Foundry wheels since I first saw them. My 2017 PP car came with 19" wheels that are a massive pain in the ass to wash, and I'm not in love with the way they look. I was considering buying a used set of Foundry wheels for my PP car. Obviously the PP car suspension is tuned for the 19" wheels, but, if I were to change to Foundry wheels are there any major disadvantages in handling/ride/performance?

Thanks for the information

Yes.

Heavier and narrower wheel, therefore narrower tire. Limited selections of good performance tires.

 

[SVT-DADDY]

They'll fit over your brakes. They are just heavy and like others have said only 9" wide.

I love mine but I am considering new wheels because of the issues above.

 

[Binfordtools]

Great information, thanks all !

 

[EFI]

Obviously the PP car suspension is tuned for the 19" wheels,

They're not necessarily tuned for 19" wheels, moreso the overall wheel/tire diameter. The car does not really know what size the wheel itself is, so it can't differentiate between a 17" wheel with 27.7" tires and a 19" wheel with 27.7" tires.

As long as you keep that diameter close to the OEM 27.1 and 27.7 you should not have any problems with "matching" the tuned suspension.

 

[SoCalTim]

Yup I’m rocking the foundry’s. PP brakes...

 

[BmacIL]

I assume you mean the 20x9 optional wheels?

Heavier and narrower in back. Rougher ride and less grip from the fashionably thin sidewalls.

This. They look great but dang are they heavy. 35 lbs each. Rougher ride both from the sidewall height and the increase in unsprung mass.

 

[Binfordtools]

They're not necessarily tuned for 19" wheels,

Respectfully disagree. Whenever there is a tire/wheel change from the OEM there is a lot of dynamics testing and tuning that happens prior to Job-1. To reduce complexity and cost, Engineers will often times find an optimal solution of spring rates and shock tuning if the same vehicle uses multiple variants in tire/wheel combinations.

 

[BmacIL]

Respectfully disagree. Whenever there is a tire/wheel change from the OEM there is a lot of dynamics testing and tuning that happens prior to Job-1. To reduce complexity and cost, Engineers will often times find an optimal solution of spring rates and shock tuning if the same vehicle uses multiple variants in tire/wheel combinations.

Except in this case, the Mustang does actually have unique suspension tuning and requires the upper K brace because of the increase in unsprung mass. Normally you're correct for a lot of cars, but not the S550. The good news is that the PP dampers are more than capable, and you already have the chassis bracing. You will notice a degradation in ride, probably not very big, but it will be there.

 

[Binfordtools]

Except in this case, the Mustang does actually have unique suspension tuning and requires the upper K brace because of the increase in unsprung mass. Normally you're correct for a lot of cars, but not the S550. The good news is that the PP dampers are more than capable, and you already have the chassis bracing. You will notice a degradation in ride, probably not very big, but it will be there.

I assume it was understood that what I suggested was tuning within the same platform (in this case the S550 with different variants only in that platform). My response was because "EFI" suggested the car was not tuned to the 19" wheel/tire package, which I do not necessarily agree with.

As for the Foundry wheels/tires, I love the look but I'm concerned just how much ride and handling degradation will happen. Sounds like maybe not too much.

Thanks for the info.

 

[GreenS550]

When I bought my '15 last fall, I looked all over for a green premium auto with the foundry wheels. They had the Pirelli summer tires 265 all the way around. Since they were 9" I put 275 Michelin Pilot Sport a/s 3+. Man do they grip. It takes a bit of work to get them spinning with line lock. Stick real good. I just cannot understand why Ford didn't do something like this from the factory? Totally bizarre. And, why does the pp have 255s in the front when just the foundry option has 265s? Though 20" wheels will ride a bit stiffer, isn't that the purpose of a handling pack, to reduce body lean?

But, the '18 pp cars I drove were both quieter and smoother feeling than my '15 with the foundry and Michelin a/s.

One other tidbit of info. When the '15s first came out a local dealer had a bunch of pp wheel/tire take offs. Believe it or not, they do not fit the '14 and down brembo brake cars. The calipers are thicker. Wierd or better engineering.

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