Does a R feel much different from a 2019+ GT350?

[pilotgore]

The Cup 2s on the 19/20 GT350 are slightly harder than the R Tires. Why they branded them the same is beyond me. The R tires do not have the FP markings

The R’s use(d) an existing size 305/30 and 315/30 cup 2 when that car hit the market, which I believe it shares in size with several other cars including some porches. A cup 2 didn’t exist for the 295/35 & 305/35 profile until ford commissioned Michelin to make them, which then went on the 19-20 350’s and carry the FP marking because they were bespoke specifically for ford performance. Since the gt350 was less track oriented than the gt350R, they decided to make the tire compound harder and “less track oriented.”
The tires use the same design and had the name recognition, so why call them anything different. . .

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[Egparson202]

And (once again) we’re back to the inescapable fact that tires are a very large part of what makes an R feel different than a non-R. With the same exact tires, not just same marketing name & size, the measurable gap is modest but real, especially in the 2019 and 2020 cars.

 

[19-kilo]

For what it’s worth when I went from the 350 and added a gurney flap I felt extra stability of the back. And then when I went to the R I noticed even better stability at the back. Aero helps.

 

[Mr. Maboomba]

For what it’s worth when I went from the 350 and added a gurney flap I felt extra stability of the back. And then when I went to the R I noticed even better stability at the back. Aero helps.

According to the video posted in this thread, the swing and gurney flap actually produces more downforce (180 lbs) than the R wing (140 lbs) at 120 mph.

 

[pilotgore]

According to the video posted in this thread, the swing and gurney flap actually produces more downforce (180 lbs) than the R wing (140 lbs) at 120 mph.

According to @Wildcardfox from this thread: https://www.mustang6g.com/forums/threads/gt350r-wings-downforce.123884/ , the numbers are as follows per an interview he conducted with ford for an article he was writing:
GT350R: 300 lbs
2019 Swing: 135 lbs @ 120 mph
2019 Swing with Gurney Flab: 238 @ 120 mph

Edit: He does say that ford didn’t mention at what speed the R produces 300lbs, although they did provide 120mph for the swing.

 

[stanglife]

The R’s use(d) an existing size 305/30 and 325/30 cup 2 when that car hit the market, which I believe it shares in size with several other cars including some porches. A cup 2 didn’t exist for the 295/35 & 305/35 profile until ford commissioned Michelin to make them, which then went on the 19-20 350’s and carry the FP marking because they were bespoke specifically for ford performance. Since the gt350 was less track oriented than the gt350R, they decided to make the tire compound harder and “less track oriented.”
The tires use the same design and had the name recognition, so why call them anything different. . .

the Rs used 315 rears

 

[Tomster]

I think the difference between R and GT350 has shrunk considerably after 2019 MY. If you put the R tires on GT350, they'll be less than half a second apart.

Also as a side note, Andy lapped the same track with the new 992 GT3 (PDK car and it literally makes 6 times the downforce GT350) 2 seconds faster. While 2 seconds isnt small, for what you get out of the GT350 is pretty remarkable. If the 992 GT3 was manual, he'd probably be about a second or so slower. You are basically 1 second apart between a $60,000 car and a $220,000 car.

Matt,

How often do you track your car?

 

[pilotgore]

the Rs used 315 rears

Whoops, typo.

 

[Tomster]

And (once again) we’re back to the inescapable fact that tires are a very large part of what makes an R feel different than a non-R. With the same exact tires, not just same marketing name & size, the measurable gap is modest but real, especially in the 2019 and 2020 cars.

No, its part of the equation, but there is more to it. The difference is the sum of all parts. Face it, we all share the same chassis as the 5L GT. What makes our cars different is the sum of the differences and the engineering behind them

 

[Tomster]

Whoops, typo.

Its ok, we all use 325s for a cheap alternative. 315s seem to be more expensive and a Ford spec., Oddball size.

 

[Egparson202]

No, its part of the equation, but there is more to it. The difference is the sum of all parts. Face it, we all share the same chassis as the 5L GT. What makes our cars different is the sum of the differences and the engineering behind them

It looks like we're in violent agreement. Since tires are such large component, I wasn't taking the time to elaborate on all the elements. But when comparing the R to the base 350, there's more to it than just tires. Unless you don't do the tires.

 

[Mr. Maboomba]

It looks like we're in violent agreement. Since tires are such large component, I wasn't taking the time to elaborate on all the elements. But when comparing the R to the base 350, there's more to it than just tires. Unless you don't do the tires.

I race on bare rims for maximum communication with the tarmac. It literally feels like you're driving on rails.

 

[Whopperman]

I race on bare rims for maximum communication with the tarmac. It literally feels like you're driving on rails.

Idiot, everyone knows you go on the shopping cart wheels for less rotational mass and hope the 4th wheel doesn't squeak/spin

 

[Egparson202]

I race on bare rims for maximum communication with the tarmac. It literally feels like you're driving on rails.

That's outstanding! Do I need carbon fiber wheels? Or will my boat anchor non-R wheels be OK?

 

[Muligan]

Boat anchors - I hadn't thought about that..... I prefer to use them to hold down my EZ-UP in the paddock - I swear, that thing is a wing, as it generates quite a bit of lift on a windy day, which is a real drag.

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