Hmmm. ACR Challenger? My suggestions: Light weight, more power, higher redline, Demon Performance brake pads.

[Kat von Himmel]

PS what is demon performance's NON FACEBOOK website? Tell me they are not so far back in the 1990's that they don't have their own web site...

 

[Hickster]

Girls, easy, decaf or fine wine. I also changed out pads and left the calipers alone. Repainted them. Brake dust down 90%. And an aluminum block would help.

 

[DGatzby]

Courtesy of Ray over at the other place. Good stuff, it don't take much!
https://moparinsiders.com/dodge-srt-is-taking-the-charger-srt-hellcat-widebody-to-pikes-peak/

 

[rayzazoo]

Lot's of interesting conversation in the thread about pads and rotors. A few excerpts found while researching:

OEM Rotor
- “There is as much energy tied up in a snub from 65 to 60 mph as there is for a whole stop from 35 to zero. So the faster you go, you have a lot more energy in your speed. Since the brake system takes all that energy and turns it into heat, the heat is transmitted to the rotors. So a bigger rotor has a bigger area for the heat, or more thermal mass. More ability to absorb the heat.”
Erich Heuschele, Manager of SRT® Vehicle Dynamics and Manager of SRT Motorsports Engineering
https://www.moparmagazine.com/2017/08/big-brakes-101/

- Hellcat Widebody for Pike's Peak Hill Climb - The Brembo brakes are still the same as the factory setup, however, they are now equipped with a set of Pagid RST 1 racing brake pads.
https://moparinsiders.com/dodge-srt-is-taking-the-charger-srt-hellcat-widebody-to-pikes-peak/

- "Comparing the weight of rotor with heat dissipation capacity, it can be concluded that the weight of the rotor increases with increasing heat dissipation capacity."
https://pdfs.semanticscholar.org/aa8d/41f3cf6ed751baa8cf041eb472115ad8e752.pdf

- Pillar Vane Rotor

Demon Performance Rotor (Girodisc)
- The primary purpose of the Girodisc system is to reduce unsprung and overall vehicle weight. "Reducing the unsprung mass has the additional benefit of improved suspension performance, resulting in enhanced ride and handling."
https://www.girodisc.com/Technical-Info_ep_45.html
- The secondary purpose is to increase the ventilation and cooling capacity of the brake disc while retaining its original dimensions.
- Front Rotor is 6.6lbs less per rotor
- The disc is made from cast iron
- Curved Vane Rotor
- "Decreasing the mass of the disc has a great benefit due to the reduction in rotational inertia. This will allow more of the braking force to be available to decelerate the vehicle, not the disc."
- "If you plan on using stock pads, plan on stock braking performance, but with less overall fade from repeated heat cycles as our rotors cool down much quicker due to the internal design." Demon Performance, Nate


https://medium.com/@Jahee_Campbell/...ion-of-an-automotive-brake-rotor-970008425ccd

http://www.ijresm.com/Vol1Iss7July18/IJRESM_17_13.pdf

Comparison (old stock rotor) (Demon Performance rotor)


New OEM 68184587AE


Old OEM 68184587AD


Demon Performance






RST Pads

 

[Kat von Himmel]

I notice that the DP rotors have less material between the vane channels and the wear surface. Would their longevity be similar, due to harder material and what, on first sight, seemt to be FAR better cooling setup in the cooling vanes? (more of them)
So curious.

Also, curved vanes lead to reduced chances of radial cracks developing, as Porsche discovered, with their cross-drilled racing rotors.

 

[rayzazoo]

I notice that the DP rotors have less material between the vane channels and the wear surface. Would their longevity be similar, due to harder material and what, on first sight, seemed to be FAR better cooling setup in the cooling vanes? (more of them)
So curious.

Also, curved vanes lead to reduced chances of radial cracks developing, as Porsche discovered, with their cross-drilled racing rotors.

Demon Performance recommends changing their rotors at 32mm.
OEM minimum is 30mm per the service manual. After, 61,000 miles, I’m currently at 31-32mm on OEM and plan to change due to an outer lip on the rotor affecting pad contact. Both start at just over 34mm. Both are cast iron discs.

Looks like the main differences are mass, thermal capacity, and vane structure.
Mass - DP rotors have less, OEM has more
Thermal Capacity - OEM has more capacity
Vane Structure - arguments are made for both pillar and curved being better for cooling

 

[Kat von Himmel]

Wow. Only 2mm per side of wear allowed on the stockers?
Only 1mm on the DP's?
1mm of wear.

I consider brake rotors to be quite the racket. by putting just 2mm of extra material per side, for an overall increase of thickness of only about 1/6 of an inch, the service life of the stock rotors could be doubled. Yet, they say only 2mm of wear allowed per side. I am not impress.

 

[rayzazoo]

Wow. Only 2mm per side of wear allowed on the stockers?
Only 1mm on the DP's?
1mm of wear.

I consider brake rotors to be quite the racket. by putting just 2mm of extra material per side, for an overall increase of thickness of only about 1/6 of an inch, the service life of the stock rotors could be doubled. Yet, they say only 2mm of wear allowed per side. I am not impress.

A things considered, the OEMs have last for 61,000 miles with drag racing and 1/2mile racing.

 

[DGatzby]

DP (fronts) -.6mm; 2 track days. +/- 200 miles
Hawk DTC-70 Pads