Drilled and slotted rotors

[SBR70.3]

So Porsche and Porsche customers are immune to fashion statements ?
Everything on the car screams “ look at me”
Btw, i like Porsche and own 1.. with drilled rotors too

I think the "look at me" thing is a byproduct of damn near perfect engineering. IMHO, the 911 is the best looking car on the road.

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[luc]

I think the "look at me" thing is a byproduct of damn near perfect engineering. IMHO, the 911 is the best looking car on the road.

Hard to disagree with that statement

 

[Sig556]

I have had R1 Concept E-Line series Drilled and Slotted rotors on my last three GT's. 2015, 2018, and, 2020 GT Premiums. I have had ZERO issues with these rotors. No noise, no excessive dust, and no rust. My braking performance has increased and I love them. When my 2024 arrives I will be switching out the stock rotors. Nuff said!

 

[Dave2013M3]

So Porsche and Porsche customers are immune to fashion statements ?
Everything on the car screams “ look at me”
Btw, i like Porsche and own 1.. with drilled rotors too

I remember back in my 997S days, guys with the PCCBs would switch out to the steel cross drilled rotors. They were so cheap that after a bunch of track days they would just buy new ones. The PCCB rotors were so expensive that a rock getting wedged in between the caliper and rotor could be a huge expense.

 

[Dave2013M3]

My dream car!!!

Oh wait, cross drilled rotors.

 

[Jstang23]

@Dave2013M3

Those "cross drilled rotors" aren't drilled at all. The carbon ceramic rotors that have the holes are not drilled in the way iron rotors with holes are. The CC rotors are literally pressed and heat treated with the mold with the holes there. So the holes are fine in that situation. Read my earlier posts as to why the drilling makes the rotors crack!

 

[shogun32]

My dream car!!!

starting to look entirely jelly-bean though. Could be confused for a Kia.

 

[dpAtlanta]

Hard to disagree with that statement

As beautiful as the 911 lines are... I think the lines of the 718 Cayman are better.... but that's just my opinion.






DRILLED ROTOR DISCLAIMER
Don't ask for a pic of the rotors on my 718.

 

[Hack]

I wasn't... friction is not related to area, but even some engineers have a hard time answering the question.

I would say that the answer - like many answers - is "it depends". Yes, area can matter for friction. Definitely wider tires give more grip. And the tires meant to provide maximum traction use very low air pressure to create a larger contact patch.

The question was: "... if friction has nothing to due with area, why are race car tires so wide?"

I am not talking about braking, just the relation between friction and area. Area is not in the mathematical formula for friction.

It's kind of like fluid flow, or fatigue, or any number of real-world situations. Friction isn't that simple and it can't be described easily by a single, simple formula.

 

[luc]

As beautiful as the 911 lines are... I think the lines of the 718 Cayman are better.... but that's just my opinion.






DRILLED ROTOR DISCLAIMER
Don't ask for a pic of the rotors on my 718.

Agree 100%, especially since i have an older Cayman s
The mid engine is a better car than the rear engine but Porsche has always been very careful to “neuter” the Cayman compared to their flagship 911

 

[Dave2013M3]

starting to look entirely jelly-bean though. Could be confused for a Kia.

I am going to recommend a good optometrist for you

 

[dpAtlanta]

It's kind of like fluid flow, or fatigue, or any number of real-world situations. Friction isn't that simple and it can't be described easily by a single, simple formula.

Ahhhhhh.... but it can be described by a single simple formula: F=μη

μ = friction
F = the horizontial force to slide the object
η = the normal force (what the thing sliding weighs)

Area only comes into play with a totally different formula: F=PA

F = force to slide the object
P = the pressure the object is putting on the ground
A = the area the object has in contact with the ground

The Coefficient of Friction formula assumes ZERO wearing or abrasion of the material.

The second formula is a shear formula... it uses the area in contact as it assumes the entire surface area is going to be sheared (wearing or abrasion). This is how the "marbles" end up on the race track.

Friction doesn't cause marbles or tire wear... shearing does.

I like your thoughts and approach on this @Hack




ENGINEERING FORMULA DISCLAIMER
I did not Google and cut paste this info… it was forced into my brain in the late 80’s by relentless Ph.D’s.

 

[MAGS1]

Come in for the car talk, stay for the physics lesson. Love it!

 

[shogun32]

Come in for the car talk, stay for the physics lesson. Love it!

just wait till they REALLY get going. Hold onto your quadratic hat!

 

[RocketGuy3]

The question was: "... if friction has nothing to due with area, why are race car tires so wide?"

I am not talking about braking, just the relation between friction and area. Area is not in the mathematical formula for friction.

Are you talking about the f = uN formula? Contact patch size directly affects the coefficient of friction (the 'u')

EDIT: I see you sort of addressed this in a follow-up message. I didn't really follow the full convo (as you can tell lol), I just thought it initially seemed disingenuous (or flat out wrong) to say that area has nothing to do with friction.

EDIT 2: I also appreciate your taste in cars

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