Help with Brake Upgrade, Rear Vented rotors |
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Help with Brake Upgrade, Rear Vented rotors |
Racing916 |
Nov 16 2009, 08:00 PM
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#1
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Member Group: Members Posts: 341 Joined: 16-October 04 From: Binghamton, NY Member No.: 2,959 Region Association: North East States |
hello,
I am currently upgrading my 914-6 to vented rotors. My hope was to take a Front "M" caliper and mount it on the rear using the 911 (69-83 Rear) vented rotors. I mock fitted the caliper and rotor and it looks like I need to place a small spacer between the caliper and the mount on the rear trailing arm (not a problem) The issue is the 911 rotors get larger as you get closer to the brake surface and rub on the "M" Calipers. Has anyone else had this issue? I realize they are larger for the parking brake, is there a parking brake delete option? 914-6GT vented rotors, suppliers? Thanks for any help, back to the drawing board! Steve |
charliew |
Dec 5 2009, 10:34 AM
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#2
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
I always thought that if you need to pump the brakes more than once the wheel bearings were too loose and the pistons were getting knocked back from disk wobble. Also I would think that the venting clearance would be a factor in the temps the rear disks and pads see on the 914. Don't race on a track so I probably shouldn't even be here. I have two sets of the 48mm brembos from the alfa and am going to put 38mm sleeves in the rears or whatever the smart guys think it needs after I get the front and rear weights stabilized with the suby motor and tranny and boxter wheels and tires. My fieros use solid rear disks and a caliper very much like the stock 914 and they are a heavier faster car than the stock 914. The 88gt I have has a 3.4 v6 with bigger ss valves and chevys hottest cam, the ecu has been reprogrammed. I probably has 180-190hp. The stock brakes with good pads works good on the street and doesn't fade with hard street use. I can mash the brakes hard from 120-130 and bring it to a stop with no problems. Of course thats nothing like the track stuff. I know the brakes smell hot but the fluid seems to hold up ok. I use the dot 5 and most people say it's junk but I don't have any water problems and most of my stuff sets a lot between uses. The dot 5 is a little spongier than 4.
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