Rear brake upgrade (again, lol), Or,how to get a vented rotor |
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Rear brake upgrade (again, lol), Or,how to get a vented rotor |
HalfMoon |
Jun 29 2017, 06:08 PM
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#1
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
So I know this has been talked to death thousands of times and when I do a google search there's reems of information, but rather than spend the entire evening reading through many posts that really aren't relevant, I thought I would pose the question and see what turns up.
Recently I had a four wheel alignment and corner balance done by a really great and well known shop out my way (who are very familiar with track cars for my local track-Summit Point) and when I asked the primary mechanic today what things he might suggest for my sbc Sheridan standard wide-body conversion, he said upgrading my rear brakes would be pretty important for that track. Soooo, yes there are lots of ways to go to be sure but I was wondering about retaining the standard rear 914 brake (and e-brake) but using the vented 911 SC rotor? Do I recall Eric made/makes a spacer for this or is/was that for converting 914 fronts to rears? A lil confused this particular application. I like the idea of retaining the stock 914 rear calipers if I can but I really want to go to vented rotor (as opposed to drilled). Thoughts? |
Racer |
Jul 6 2017, 03:44 PM
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#2
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
Tricky part about Summit Point (main) is the T1 entry. With my 911SC, I would just brush 120mph and have to brake to 45-50 ish for T1. Do that 15-20 times a session. A SBC could be pulling closer to 140mph (depending on aero and driver) but still need to brake down the same.. so scrubbing close to 100mph.
The related issue is that you then have T5 -entry to the carousel. While you might enter at 100 ish, you have to brake down again, to 40ish... and by the third hot lap, THIS will be where you really want effective brakes with large heat soak ability, or LOTS of cool air... imho, messing around with home made this and that vs a proven and supported product that, while giving up the E-Brake, allows you and a passenger / instructor to be confident of high speed stopping seems to be putting a cart before the horse... At minimum I would encourage you to run SC rotors and calipers front and rear along with ducting to get air on them. While the prices might be crazy, at least look at the Lots of general good brake info here.. http://www.vehiclecraft.com/Brakes/930_upgrade.htm |
HalfMoon |
Jul 6 2017, 03:58 PM
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#3
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
Tricky part about Summit Point (main) is the T1 entry. With my 911SC, I would just brush 120mph and have to brake to 45-50 ish for T1. Do that 15-20 times a session. A SBC could be pulling closer to 140mph (depending on aero and driver) but still need to brake down the same.. so scrubbing close to 100mph. The related issue is that you then have T5 -entry to the carousel. While you might enter at 100 ish, you have to brake down again, to 40ish... and by the third hot lap, THIS will be where you really want effective brakes with large heat soak ability, or LOTS of cool air... imho, messing around with home made this and that vs a proven and supported product that, while giving up the E-Brake, allows you and a passenger / instructor to be confident of high speed stopping seems to be putting a cart before the horse... At minimum I would encourage you to run SC rotors and calipers front and rear along with ducting to get air on them. While the prices might be crazy, at least look at the Lots of general good brake info here.. http://www.vehiclecraft.com/Brakes/930_upgrade.htm Thank you for the valuable and obviously experienced based advice for SP. I already have front SC rotors and calipers. Billy over at Performance Automotive in Kearnesville recommended going to the vented SC rear rotor but my instructor Mark said I could probably get away with the stock 914 rear caliper for now as I'm at novice level and will be for some time I would think. I can say with real authority that while my teener could enter 1 at the speeds you've described, my ability to do so would preclude attempting that for quite some time. In fact I couldn't imagine anything over 100 at this point. At some point, adding the SC rear calipers would be a must, but I think the vented rear rotors (and yes, maybe even some ducting, we'll see) should suffice for now. Again, thanks for that bit of advice :-) |
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