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Added caliper spacers for big rotor upgrade on front axle. From 330mm oem rotor size to the Turbo 350mm rotor size.
changed oil and filter. Took some pics.
No spirited canyon drives, no group ride, but what I did do was take my daughter to go get ice cream. Some of the best conversation we've had in a while, just really good quality time. While we were out a song came on that me and my dad used to listed to when he took me for rides in his cars. It's insane how times flies, no matter how hard we try to outrun it - or outdrive it I guess.
Added caliper spacers for big rotor upgrade on front axle. From 330mm oem rotor size to the Turbo 350mm rotor size.
changed oil and filter. Took some pics.
Please enlighten me... Why go to a bigger rotor if you are using the same size caliper??? Unless I'm missing something, seems to me that the braking surface remains the same and therefore this mod is totally useless, other than adding weight (which I personally don't care about, but is a big thing to some) No???
Bigger rotor moves the braking surface further from the center of the rotation which increases brake torque even with the same size caliper. Brake torque is equal to the force applied by the pad multiplied by the distance at which the force is applied from the center of the wheel.
Bigger rotor moves the braking surface further from the center of the rotation which increases brake torque even with the same size caliper. Brake torque is equal to the force applied by the pad multiplied by the distance at which the force is applied from the center of the wheel.
HAHAHA, there may have been some copy/paste in there, from a reputable source. But I did take physics in college and I stayed in a Holiday Express last night...
New to forum. New purchase and needed a brake refresh.
Hello all,
I recently picked up an 07 4S with 42K miles on her. She might be the best car I have ever owned. It is exactly what I wanted and I searched for awhile. First Porsche/German car ever. I come from the hotrod world but am a fan of all things Motorsport. Car was bought form a dealer in Chicago and without a PPI. She is everything they said she is but there was a brake issue. More specifically they squeaked terribly. I didn’t want to fool around so I dove in with a compete brake overhaul. Did it myself and it took a few weekends but turned out great. Looking forward to being part of the forum and learning about these amazing vehicles..
Please enlighten me... Why go to a bigger rotor if you are using the same size caliper??? Unless I'm missing something, seems to me that the braking surface remains the same and therefore this mod is totally useless, other than adding weight (which I personally don't care about, but is a big thing to some) No???
To be honest... it started for me at a cars and coffee. On that particular day I have to admit that I was having some "big rotors" envy looking at some of those giant 350-380mm rotors next to my "tiny" 330mm.
I stated in the other forum that with the right brake pads, brake fluid, and oem 330mm rotors I have never had my brakes fade or fail me through dozens of track events or bat out of hell canyon runs. I never felt the need for more braking power, but my rotors were looking a bit toasty and ready to be replaced soon so the seed was planted and I figured.. what the heck, let's try it. So I did this primarily for cosmetic reasons, because I like to tinker and because I think they look cool. Shortening my braking distance was not my primary reason to do this, BUT, as Professor dmpslc pointed out... they should have some added benefits with not only brake torque, but also heat dissipation because there is more surface area and mass, which should give some braking benefit at a track event or canyon bashing. I do not think this mod makes a difference for normal driving situations.
I also struggled with adding weight back on to my rotational mass because I noticed some nice benefits when I went to the Light weight OZ wheels, so adding weight back on was a mind game for me, but it is only a 2 lbs difference between new/fresh 330mm 24 lbs vs 350mm 26 lbs and I wanted to try it out for kicks. My old rotors were worn down quite a bit with a tiny lip at the edge of the rotor and they weighed 23lbs each when I took them off, so there was a 3 lbs difference going from old 330 mm to brand new 350mm rotors. I can feel the weight just a bit. Steering feels a tiny bit heavier and more solid. Because weight was on my mind I only did the Front rotors for this mod. Did not want to add more rotational mass to the rears which is where I gained the most weight savings, 6lbs each wheel, with the OZ wheels and is more directly connect to the engine/trans power output.
Originally Posted by platinum997
Notice any difference in stopping
To be honest, the biggest difference will probably be at the track. My old pads are still breaking in to these new rotors so I have not tried them out to their "full effect" just yet. With that said, having fresh meat on those rotors did cut my brake pedal travel down a bit, as we all feel with new rotors, and initial bite and stopping power feels good! Technically speaking, braking distances should be a bit shorter, but I am not out there measuring any stopping distances any time soon
Originally Posted by nicogri
Curious about the model of those OZ wheels... looks super nice !
Bigger rotor moves the braking surface further from the center of the rotation which increases brake torque even with the same size caliper. Brake torque is equal to the force applied by the pad multiplied by the distance at which the force is applied from the center of the wheel.
Exactly! Don't forget to add in the circumference of the earth and gravitational pull of the moon as well. Makes a difference!! Thanks Professor dmpslc
Actually your explanation was/is in the back of my mind for sure and a great added benefit. Thanks for the copy and paste to keep us scientific on this instead of always using our emotions and butt dynos
FWIW you are dealing with unsprung weight as well as rotational mass. So if you saved 6 pounds on the wheels and added 3 with the rotors you still saved 3 pounds of unsprung weight. But rotational mass is based on how far from the axis of rotation the mass is located. 6 pounds at the wheel counts for more than 6 pounds at the axis of rotation (or 3 pounds half way out to the wheel). So with the OZ wheels you saved weight where it matters most.
Changed out my rusty looking lug bolts with the latest black anodized ones from Porsche. Interestingly, the factory torque spec was upped to 118 lb ft instead of the former 96 on the silver bolts.
10-14-2019, 08:56 AM
