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Road Course, Track, Autocross, HPDE Discussions of road course/track, corner-carving, autocross and HPDE.


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Old 04-19-2018, 01:00 PM   #91
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@DR I hear you. I am very happy with my current 18" wheels (18x10 at all four corners, and only 23.5 lbs each) and tires; I don't really want to change them.

When I figure the cost of the brake and rotor upgrade, and the master cylinder, and the bigger wheels and tires, it's starting to look very expensive (even if the upgraded brakes and rotors are bargain NTOs).

Sure the Eradispeed+ 2-piece look expensive. But it seems like it should be less in the long run. Plus the whole package (aluminium hat rotors, 4 pistons callipers, 23.5 lb wheel) is looking like it will be substantially lighter than anything I can afford if I were to upgrade to the 6 pistons callipers. I am guessing that the lower rotational mass and the much better cooling with 2-piece rotors could each have noticeable effects. The price ($745.00) is no longer looking so bad. Now I just need to start saving up!
Oh by the way, I had seen this quite a while ago, but was recently reminded: the GT350 master cylinder is the same as the base GT (non PP). The claim is BS.
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Old 04-19-2018, 01:11 PM   #92
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Oh by the way, I had seen this quite a while ago, but was recently reminded: the GT350 master cylinder is the same as the base GT (non PP). The claim is BS.
THAT is very good to know!
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Old 04-21-2018, 12:07 AM   #93
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So out of curiosity how much interest would there be in something like this..if it were available?
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Old 04-21-2018, 08:26 AM   #94
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So out of curiosity how much interest would there be in something like this..if it were available?
Would love it, but probably not the price, at least at the moment.
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Old 04-21-2018, 09:20 AM   #95
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How hard could it be to cast up 1-piece rotors with the air inlet on the back side? I bet they'd even come in a little lighter than the non-PP design, since the hat portion wouldn't have to be as deep. Better back-side airflow ought to more than compensate for the longer heat path from disc to hub in the front-side design.


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Old 04-21-2018, 09:40 AM   #96
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How hard could it be to cast up 1-piece rotors with the air inlet on the back side? I bet they'd even come in a little lighter than the non-PP design, since the hat portion wouldn't have to be as deep. Better back-side airflow ought to more than compensate for the longer heat path from disc to hub in the front-side design.


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See post 89 and 90
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Old 04-21-2018, 09:51 AM   #97
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https://www.racingbrake.com/RB-OE-Tw...for-irk-04.htm

Another 2 piece rotor option for front and rear.
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Old 04-21-2018, 09:51 AM   #98
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See post 89 and 90
Even without an aluminum hat section, a rotor with back-side air inlet should end up being lighter. The aluminum-hat 2-piece should be better at insulating the hubs against brake heat, though.


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Old 04-22-2018, 02:28 PM   #99
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https://www.racingbrake.com/RB-OE-Tw...for-irk-04.htm

Another 2 piece rotor option for front and rear.
Those are for Performance Pack 15".
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Old 04-24-2018, 04:24 PM   #100
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Let me say that I really appreciate all the technical talk about the non-PP brakes. I took it hard on the OEM rotor+pads for one lap and after 3 transitions I lost all confidence (on 265/45R18 RE71R). I've since installed data acq so we'll have video and live data the next time I go out. My local track (Gimli) has a nice run-off on the first turn after the long straight and I'm not afraid to pucker up.

The system has to be somewhat salvageable. I have GLOC 12&10s but I haven't installed them since I read they get too hot and I hadn't yet bought another set of rotors or installed cooling because, well, time (my second son was born) and money (we bought a bigger house with a shop). I'd even consider setting up some kind of IR sensor on the rotor.
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Old 04-24-2018, 05:39 PM   #101
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There should be a series of sticky threads in this forum - one should be what to do about non-pp brakes. Guess we veered off the original subject a bit, but I don't mind. Might be hard for someone searching for info to find it though.
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Old 04-24-2018, 05:57 PM   #102
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Want to add that I did a two day track event at Eagle's Canyon, which is very hard on brakes, and the 14" non-PP rotors and calipers with Powerstop Track Day pads held up really well. I was not on the stickiest rubber (340TW Firestone Indy 500) and more importantly I did not try to threshold brake every braking zone of every lap.
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