Rotor vibration
#46
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never underestimate the power of the HUMAN. we can be trained to do a lot more complicated things, than just tighten a lug nut within 5% of 90ftlbs.
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cracked rotors..... replaced them... no propogation over the season, but new rotors are on now.
undertorqued lugs...... within 5% of spec... also using steel lug nuts, so you tell me if thats more of a safety margin or less vs the stock aluminum...... oh, you might have to think about that one mikey!
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to throw a wrinkle...porsche uses alum lug nuts on some cars while most of us use steel ones for the track. Does that change torques spec? Idk
Also, not mentioned, make sure the lug nuts are tightened while wheel is in the air and do it in a star pattern. Don't tighten one lug all the way but distribute the torque.
Start threading by hand so you dont crossthread them.
Be careful using impact guns for reasons above. And let wheels cool off a bit before taking them off right away.
Also, not mentioned, make sure the lug nuts are tightened while wheel is in the air and do it in a star pattern. Don't tighten one lug all the way but distribute the torque.
Start threading by hand so you dont crossthread them.
Be careful using impact guns for reasons above. And let wheels cool off a bit before taking them off right away.
YES, when the material changes the entire model changes.
I would suggest , if you get the wheels very hot to remove the lugs when hot... they seem to come off easier and donl't stick as much. safer for reducing the chance of damaging threads or wheels.
I usually just electric drill wrench the lugs snug.. light hand tighten with a wrench to make sure wheel stays centered and is seated, then lower the car and tighten the lugs to "near" spec on the ground
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#48
#49
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I apologize to the OP for taking this thread off topic. All I wanted to do was ensure that everyone is safe and has the correct information.
Mark, if you want to talk about wheel torque start your own thread. Do not hijack the OP's thread.
It is amazing how a simple correction in a torque value can turn into 2 pages of debate...
Mark, if you want to talk about wheel torque start your own thread. Do not hijack the OP's thread.
It is amazing how a simple correction in a torque value can turn into 2 pages of debate...
#50
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Now, I do have a wrench. unlike you and others here that get so caught up in the little things....like (do you really think 5% variance in wheel lug is a discussion or reason to tee off on someone? take an engineering class, on line or something. get a reality check.... its silly ... and only a reason for you to go nuts on line.
now, you make another dangerous assumption. i dont own a torque wrench. well, how do you think i build all those engines that stay together for so long?? i dont guess with them. i have a calibrated torque wrench for those things in life that really matter to be better than 5% off.... (e.g. torquing heads, rod nuts , transmission components, etc)
You still think that the screen wire sizes equates to smalller diameter inlets and drive around with your open cooling ducts, with rotors packed with rubber gue.......... you dont see parts on my car clogged up with anything. Mike, you have to start using your head here!
Put some course screens on the inlets... trust me.. you will be ok!!
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#51
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I apologize to the OP for taking this thread off topic. All I wanted to do was ensure that everyone is safe and has the correct information.
Mark, if you want to talk about wheel torque start your own thread. Do not hijack the OP's thread.
It is amazing how a simple correction in a torque value can turn into 2 pages of debate...
Mark, if you want to talk about wheel torque start your own thread. Do not hijack the OP's thread.
It is amazing how a simple correction in a torque value can turn into 2 pages of debate...
You started a lug nut tightening discussion and all you needed to do was say, the spec is 96ftlbs . the disucssion where you suddenly think 5ftlbs, or 5% is going to endager someones life is a little unwarranted and incorrect. this is YOUR discussion diversion. 5% is a perfectly good limit for range of steel studs and nut assortments anyone could use .
I think ive contributed more than my fairshare here about the rotors and his rotor vibration... I also think the OP is appreciative for my advice. and im sure he is equally appreciative to put that 5ft-lbs you suggested, back on the torquing on the wheels so they dont fall off.
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#52
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#53
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Aspen Rep, you are not the discussion police board. I only offered a very safe torque that was 5% lower than spec. let's not boil the oceans trying to prove that this is dangerous. You had us at your correction of the spec being 130Nm and 96 ftlbs, (which is really 95.8).
You started a lug nut tightening discussion and all you needed to do was say, the spec is 96ftlbs . the disucssion where you suddenly think 5ftlbs, or 5% is going to endager someones life is a little unwarranted and incorrect. this is YOUR discussion diversion. 5% is a perfectly good limit for range of steel studs and nut assortments anyone could use .
I think ive contributed more than my fairshare here about the rotors and his rotor vibration... I also think the OP is appreciative for my advice. and im sure he is equally appreciative to put that 5ft-lbs you suggested, back on the torquing on the wheels so they dont fall off.![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
You started a lug nut tightening discussion and all you needed to do was say, the spec is 96ftlbs . the disucssion where you suddenly think 5ftlbs, or 5% is going to endager someones life is a little unwarranted and incorrect. this is YOUR discussion diversion. 5% is a perfectly good limit for range of steel studs and nut assortments anyone could use .
I think ive contributed more than my fairshare here about the rotors and his rotor vibration... I also think the OP is appreciative for my advice. and im sure he is equally appreciative to put that 5ft-lbs you suggested, back on the torquing on the wheels so they dont fall off.
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In my 1st post all I did was assumed you had a typo and I stated the correct torque spec, I moved on from that and I gave recommendations as to what rotors I have had lots of success with over the years.
Then you came back at me and started this argument. Porsche has come up with the spec of 130 Nm (95.88307940601 ftlbs) for a reason. Just like they now have the spec of 160 Nm (118.00994388432001 ftlbs) for some newer cars or the Cayenne's.
Would you be able to sleep at night if someone listened to you and had an on track incident taking someone or multiple peoples lives?
#54
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You are right I am not the discussion police board but I can voice my opinion as to what I feel is the best to keep other RL members on topic. Members use this forum as a source of information and it makes it very difficult for people to continue to use and enjoy the forum when every topic gets taken off on a tangent.
In my 1st post all I did was assumed you had a typo and I stated the correct torque spec, I moved on from that and I gave recommendations as to what rotors I have had lots of success with over the years.
Then you came back at me and started this argument. Porsche has come up with the spec of 130 Nm (95.88307940601 ftlbs) for a reason. Just like they now have the spec of 160 Nm (118.00994388432001 ftlbs) for some newer cars or the Cayenne's.
Would you be able to sleep at night if someone listened to you and had an on track incident taking someone or multiple peoples lives?
In my 1st post all I did was assumed you had a typo and I stated the correct torque spec, I moved on from that and I gave recommendations as to what rotors I have had lots of success with over the years.
Then you came back at me and started this argument. Porsche has come up with the spec of 130 Nm (95.88307940601 ftlbs) for a reason. Just like they now have the spec of 160 Nm (118.00994388432001 ftlbs) for some newer cars or the Cayenne's.
Would you be able to sleep at night if someone listened to you and had an on track incident taking someone or multiple peoples lives?
AND, make sure that someone or you (the car driver) not only makes sure the torque is at a minimum............ but make sure they are all even. torqued up to 96ft-lbs. those air guns can often over torque one or two nuts and cause the problem that the OP had.
And ive been here to promote things that can save lives or peoples lives....Advising against the guy(s) that promote putting the car in neutral,(instead of blip downshifting) when they lose bakes so they can crash out the track gates on to public hyways..... for example.
#55
Race Car
Thread Starter
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Stoptech slotted ordered for rear, DTC-70 ordered for all four corners for track days only. Hopefully I can get them bedded properly on the new rotor which sounds like it may be a challenge.
And yes, all input has been greatly appreciated.
#56
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And to save typing as it's still close enough to fit here:
And the kibortion cycle is complete. Random assertion backed by gut feeling contradicted by expert relying on data, kibort refutation of data coupled with insult to expert, expert tactfully tells kibort he's still wrong and bows out.
Aaaaaand scene, that's a wrap people.
Aaaaaand scene, that's a wrap people.
Above obviously stolen from the opening narration to The Twilight Zone.
-Mike
Last edited by TXE36; 04-19-2016 at 05:51 PM.
#57
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You will probably see heat cracks develop on the surface of the rotors but it isn't much to be worried about. If you have any concerns based on the size, length, or location of the crack feel free to post it or send me a picture in PM.
As others have mentioned keep the car as stock as possible and get the seat time. When I say stock I mean caliper size and such. Absolutely perform the safety upgrades and items that will increase the longevity of your car. I have seen you post in other threads such as the oil pan, that is absolutely a must have for a track car. Good luck and if you need anything feel free to reach out.
#58
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Markie Mark, is not that you know nothing.
It's more than you know so much that simply is not true .
As others have said here and in every other thread Mark is in, FOLLOW HIS ADVICE AT YOUR OWN MORTAL PERIL.
Mark, STFU before you get someone hurt or killed.
It's more than you know so much that simply is not true .
As others have said here and in every other thread Mark is in, FOLLOW HIS ADVICE AT YOUR OWN MORTAL PERIL.
Mark, STFU before you get someone hurt or killed.
#59
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5% variance on torquing a bolt is plenty safe by any logical measure
YOU are the one trying to kill people , endorsing the circus driving act of not downshifting in an emergency, let alone taking it out of drive. this is the stuff that really can hurt someone. You better re-evaluate your logic and the forces of nature. You dont seem to have a grasp, nor should you be advising or correcting anyone that does!
So, my big mouthed friend.. it is you that can STFU!