"More" Flippin' Fun with Centerlocks !!!
07-28-2011, 03:33 PM
#1
Burning Brakes
Thread Starter
"More" Flippin' Fun with Centerlocks !!!
Hi all,
I just had my car at the dealer this morning for the CL Re-call AB01 Campaign. Before my car went in I asked to speak with the shop manager regarding something I found in the new CL Supplement to the service manual which I had studied the night before. Note, there are no page numbers on this manual, but in Step 10 of the wheel change procedure (5 pages in, including the cover) it states that one must grease the conical surface of the wheel nut (the area "A" in the diagram). This is the part of the wheel nut that presses on to the wheel, and therefore a "torqued" surface. When the manager examined the "Porsche service information", a 19 page document that guides the service technicians through the examination for the AB01 re-call, he discovered that this document makes no mention of greasing this particular surface (only the threads on the nut and CL hub, and the inner part of the wheel nut). What to do?
My feeling is that the nut is designed to turn internally for a reason, i.e. when one has the nut in your hand front face down, one can press on the conical surface "A" and turn it with respect to the rest of the nut. Thus, when torqueing, the conical surface "A" presses against the wheel and then stays put at a relatively low torque, and outer nut spins as the nut is torqued to spec (now a whooping 444ft.lbs or 600Nm under all conditions, street or track). Also, on our OEM wheels, the tappered torqued surfarce is machined to be slightly rough. So why the hell would we grease conical surface “A”?
What is the right answer? What to your guys think?
I have raised a case # with Porsche NA to get to the bottom of this fairly LARGE ambiguity in the new owner's manual supplement and will report back.
Cheers!
Doug N
I just had my car at the dealer this morning for the CL Re-call AB01 Campaign. Before my car went in I asked to speak with the shop manager regarding something I found in the new CL Supplement to the service manual which I had studied the night before. Note, there are no page numbers on this manual, but in Step 10 of the wheel change procedure (5 pages in, including the cover) it states that one must grease the conical surface of the wheel nut (the area "A" in the diagram). This is the part of the wheel nut that presses on to the wheel, and therefore a "torqued" surface. When the manager examined the "Porsche service information", a 19 page document that guides the service technicians through the examination for the AB01 re-call, he discovered that this document makes no mention of greasing this particular surface (only the threads on the nut and CL hub, and the inner part of the wheel nut). What to do?
My feeling is that the nut is designed to turn internally for a reason, i.e. when one has the nut in your hand front face down, one can press on the conical surface "A" and turn it with respect to the rest of the nut. Thus, when torqueing, the conical surface "A" presses against the wheel and then stays put at a relatively low torque, and outer nut spins as the nut is torqued to spec (now a whooping 444ft.lbs or 600Nm under all conditions, street or track). Also, on our OEM wheels, the tappered torqued surfarce is machined to be slightly rough. So why the hell would we grease conical surface “A”?
What is the right answer? What to your guys think?
I have raised a case # with Porsche NA to get to the bottom of this fairly LARGE ambiguity in the new owner's manual supplement and will report back.
Cheers!
Doug N
1000Nm, you must have your own elephant in the paddack to help loosen your wheels nuts after a day's worth of heat cylces!
07-28-2011, 04:55 PM
#5
Rennlist Member
I'm really not sure myself, though I've been pretty generous with the grease so it gets almost everywhere anyway, and haven't had any issues after several events, so take that for what it's worth.
07-29-2011, 11:11 AM
#6
Burning Brakes
Thread Starter
Cheers!
Doug N
07-29-2011, 12:25 PM
#7
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Honestly, the CL just take all the joy out of this car. A simple wheel change or inspection between runs becomes such an event. Something as simple as switching wheels left to right after a few runs to even out wear requires so much more work.
What were these people thinking
What were these people thinking
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07-29-2011, 01:47 PM
#8
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After almost 2 years of owning CLs, I finally did my own change on my new RS. I really don't understand what the big deal is. It' pretty simple. I think it's a bit gimicky and Porsche didn't thoroughly test the CL under all conditions, but given that we have them on our cars, they really aren't that big of a deal.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
07-29-2011, 02:26 PM
#9
Rennlist Member
Positive Approach
After almost 2 years of owning CLs, I finally did my own change on my new RS. I really don't understand what the big deal is. It' pretty simple. I think it's a bit gimicky and Porsche didn't thoroughly test the CL under all conditions, but given that we have them on our cars, they really aren't that big of a deal.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
07-29-2011, 03:00 PM
#10
Official Wednesday AM Red Bull F1 test driver
Rennlist Member
Rennlist Member
They look so good I don't mind them that much either. The torque multiplier works pretty well and when checking against the monster torque wrench, it's pretty accurate. Hope I don't change my tune after the first DE coming up at RA...
07-29-2011, 03:40 PM
#11
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After almost 2 years of owning CLs, I finally did my own change on my new RS. I really don't understand what the big deal is. It' pretty simple. I think it's a bit gimicky and Porsche didn't thoroughly test the CL under all conditions, but given that we have them on our cars, they really aren't that big of a deal.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
Why grease? Because Porsche says so, so add some lube and put the f'in CL back on to the appropriate torque spec, then go have some fun on the track.
I'd probalby take 5 lug over the CL, but it's not causing my heartache or keeping me up at night.
I disagree. Sure, if you have to do it once every two years, in a controlled enviorment, no issue. Maybe even fun. But I was at an open track event this past week, and drove 500 miles in two days on the track. Multiple tire changes, brake bleed, even a brake pad change. Try doing it 4 or 5 times in a couple of days at the track, when it's hot and you want to get the car back out. Not fun.
07-29-2011, 05:21 PM
#12
Burning Brakes
Thread Starter
Anyone who thinks that the CL's are not a PITA, hasn't R&R'd enough wheels yet! 
I've put my 2 years of track event changes in too!
Have a great weekend guys!
Doug N
I've put my 2 years of track event changes in too!
Have a great weekend guys!
Doug N
07-29-2011, 07:08 PM
#13
Race Director
I've watched Trakcar and Izzone change a lot of CL's...no big deal never hear them complain. I bet NO ONE on rennlist has messed with CL's than these 2 guys! I talked to both before I bought the GTS w/ CL's.
