I scaled images to get a comparison of wilwood single pads for the rear compared to my current 1.6l pads.

total pad area looks similar. The wilwoods will have more sweped surface area on the rotors. which would last longer?

 

The timing of this thread is perfect. I have been sitting on the sidelines waiting for the ideal 4 wheel solution. Great info guys!

Bob why would you choose the 2x1.38 verses the 4x1.00? Todd states the piston volume of each is about the same.

 

2X 1.38” piston area 1.50”
4X 1” piston area 1.58”
Close enough I think.

Looks like only off the shelf for a 4X1” the option is narrow Dynapro Lug Mount.

I’m kind of thinking on the theory that the behavior of the pad friction material is is non linear with both temperature and operating pressure. Race pads that work awesome with high pressure and high temp offering good feel and pad and rotor wear rates tend to behave much differently if your just tooling around on the street with them with low brake pressures and temp. Even if they do have a flat friction curve it seems to like to grind down the rotors fast with the pads cold and hard and light pressure.

With the same size pads front and rear and the rear operating with a little less than half the piston force to maintain bias the much lower pad to rotor operating pressure seems like it wouldn’t balance the system optimally. Front pads will be working hard rear pads will be on a drive back from the grocery store.

More data

Forged Dynalite 3.4lbs
Dynapro Radial 4.0lbs
Narrow Dynapro lug mount 4.1 lbs
Dynapro Single 2.3 lbs

Dynapro Radial/narrow Pad-----Area 6.36 sqin----Volume 3 cuin
Forged Dynalite Pad------------Area 6.36 sqin----Volume 2.1 cuin
Dynapro Single Pad-------------Area 3 sqin-------Volume 1.1 cuin

Bob

 

I swapped to the 6.4:1 booster, drilled a hole in the pedal, and moved the booster arm down ~0.5". My rough guess is the pedal ratio is now closer to 3.5:1. It felt a lot better on the street this morning, but I wasn't able to really test it with no sun and low 40s.