Project this weekend: S4 brakes checklist for the 81'
12-11-2009, 11:15 AM
#16
Rennlist Member
how are you addressing the non hubcentric factor of the S4 rotor on the older hub?
also, since you are using calipers that are specifically designed for position on an S4 rotor, how are you addressing the radial position? are these adapeters designed for position of the calipers on a 993TT rotor, 322mm, or is it a similar 12" rotor, like the original S4 rotor like maybe the normal 993 rotor is configured. sounds like an awesome upgrade.
Is this old bugger only, or can this work for 84 spindle type 928s?
I
also, since you are using calipers that are specifically designed for position on an S4 rotor, how are you addressing the radial position? are these adapeters designed for position of the calipers on a 993TT rotor, 322mm, or is it a similar 12" rotor, like the original S4 rotor like maybe the normal 993 rotor is configured. sounds like an awesome upgrade.
Is this old bugger only, or can this work for 84 spindle type 928s?
I
If bearings are good, you can just reuse.
When you replace dust shields, you have to remove the front hub assembly which contains the bearings, etc to get them off. Since bearings were original, I went ahead and replaced and repacked them.
I did S4 dust shields in the front.
Rears are much easier upgrade.
When you replace dust shields, you have to remove the front hub assembly which contains the bearings, etc to get them off. Since bearings were original, I went ahead and replaced and repacked them.
I did S4 dust shields in the front.
Rears are much easier upgrade.
12-11-2009, 11:19 AM
#17
Man of many SIGs
Rennlist Member
Rennlist Member
how are you addressing the non hubcentric factor of the S4 rotor on the older hub?
also, since you are using calipers that are specifically designed for position on an S4 rotor, how are you addressing the radial position? are these adapeters designed for position of the calipers on a 993TT rotor, 322mm, or is it a similar 12" rotor, like the original S4 rotor like maybe the normal 993 rotor is configured. sounds like an awesome upgrade.
Is this old bugger only, or can this work for 84 spindle type 928s?
I
also, since you are using calipers that are specifically designed for position on an S4 rotor, how are you addressing the radial position? are these adapeters designed for position of the calipers on a 993TT rotor, 322mm, or is it a similar 12" rotor, like the original S4 rotor like maybe the normal 993 rotor is configured. sounds like an awesome upgrade.
Is this old bugger only, or can this work for 84 spindle type 928s?
I
He is using the S4 rotors on the rear only. 993 non turbo rotors on the front.
The adapaters are only made for the early 78 - 81 spindles. I don't think anyone has ever made an adapter for the 82 - 86 spindles. I'm not sure why, I'd have to look and see the differences. I believe the only difference is the bolt spacing where the caliper mounts but I'll have to check to be sure.
12-11-2009, 11:22 AM
#18
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There seems to be alot of confusion on this upgrade so I will do my best to document the entire procedure with pics and write up. I have a machine shop across the street if I need any custom bits to get through it. I'm pretty sure you don't need to upgrade the OB spindles and it's a direct bolt on with the adapters I have. The 993TT rotors DO NOT FIT on this application only the non TT-993 rotors.
12-11-2009, 03:41 PM
#19
Rennlist Member
got it,non 993TT rotors, so the diamter is close to the same as S4.
BUT, if the 993 and 993TT rotors have the same offset, all you need is the spacers on the spacers to make that work. then you go to the 13"rotors, which is a nice improvement, at only the cost ofthe spacers and longer bolts to the spacers you had made.
BUT, if the 993 and 993TT rotors have the same offset, all you need is the spacers on the spacers to make that work. then you go to the 13"rotors, which is a nice improvement, at only the cost ofthe spacers and longer bolts to the spacers you had made.
There seems to be alot of confusion on this upgrade so I will do my best to document the entire procedure with pics and write up. I have a machine shop across the street if I need any custom bits to get through it. I'm pretty sure you don't need to upgrade the OB spindles and it's a direct bolt on with the adapters I have. The 993TT rotors DO NOT FIT on this application only the non TT-993 rotors.
01-15-2011, 07:57 AM
#20
looked, looked, now asking
I have to resurrect this thread. Did you guys get the S4 calipers and 304 x 32mm x 76 offset S4 rotors on the 104mm eared spindles/ early hubs without getting too close to the lower balljoint?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
01-15-2011, 01:33 PM
#21
Rennlist Member
I have to resurrect this thread. Did you guys get the S4 calipers and 304 x 32mm x 76 offset S4 rotors on the 104mm eared spindles/ early hubs without getting too close to the lower balljoint?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
01-15-2011, 01:50 PM
#22
Rennlist Member
S4 rotors are more like 80mm offset, right.
993 rotors must be a lot different than the 964T rotors, which have identical offset to the S4/GTS rotors. this must be why they have special adapters made for their specific offset that can be used with the OB's brake system.
now this makes me wonder if the 993turbo rotors have the same offset as the 72mm you list below. if so, its only 3mm off the cayanne rotors we are using for the '84 upgrade. sure, they will be only 322mm i would guess, but they might have the right rotor oriented hub screw holes and would take less material to cut off the "S" calipers than trying to use the 330mm rotors.
993 rotors must be a lot different than the 964T rotors, which have identical offset to the S4/GTS rotors. this must be why they have special adapters made for their specific offset that can be used with the OB's brake system.
now this makes me wonder if the 993turbo rotors have the same offset as the 72mm you list below. if so, its only 3mm off the cayanne rotors we are using for the '84 upgrade. sure, they will be only 322mm i would guess, but they might have the right rotor oriented hub screw holes and would take less material to cut off the "S" calipers than trying to use the 330mm rotors.
I have to resurrect this thread. Did you guys get the S4 calipers and 304 x 32mm x 76 offset S4 rotors on the 104mm eared spindles/ early hubs without getting too close to the lower balljoint?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
I see that the 993 Non-TT rotors are 304 x 32 x 72 and the -4mm is critical at the lower Balljoint and only found a reference here that the Lower B-joint can come into contact with the 76mm offset 928 S4 rear rotor face under compression.
Can someone clear the air?
01-15-2011, 03:09 PM
#23
Yes the 911 crap is 136mm PCD setscrews just like the 928/44/68.
Reason I ask is the 76mm offset rotor can take a 6-7mm concentric spacer between the hub and S4 rotor and still have plenty of lug nut threading. This will get the rotor off the B-joint, at the same time better S4 or aftermarket caliper clearance with a 300 or 304mm Dia.Rotor and 16" phonies remain.
Reason I ask is the 76mm offset rotor can take a 6-7mm concentric spacer between the hub and S4 rotor and still have plenty of lug nut threading. This will get the rotor off the B-joint, at the same time better S4 or aftermarket caliper clearance with a 300 or 304mm Dia.Rotor and 16" phonies remain.
