Wilwood Rotors toast?
6 Attachment(s)
I'm not knowledgeable on "reading" a rotor that has seen track duty, thought I'd get some opinions on this. I noticed on my last HPDE increased pedal pressure required to slow the car down. It's the goodwin Wilwood 11" kit with polymatrix pads (not 100% on which letter). So I inspected my rotors and they don't look quite right to me. Lots of inconsistent markings, and some light surface cracks. They don't have any noticeable lip or anything that would make me thing they are worn, did I manage to cook them? I've always given them a cool down lap.
|
I should say, fluid is fresh, rears look 100% fine. This was at Blackhawk farms (~106mph tops) in 85 degree ambient.
|
If they were solid, I'd be OK on those for another day or two with careful monitoring. Since they are slotted, I'd pull them now.
|
those rotors have seen some heat. the rules for when it's time to replace a rotor.
1. if you go past minimum thickness. 2. If you can fit your fingernail inside a crack 3 if you have a crack starting at the edge of the rotor. the blue tint you see is transfer layer from the pad. that will develop cracks and it's nothing to worry about. once you see the iron splitting apart it's time to switch. |
Originally Posted by Savington
(Post 1247117)
If they were solid, I'd be OK on those for another day or two with careful monitoring. Since they are slotted, I'd pull them now.
Originally Posted by OGRacing
(Post 1247118)
those rotors have seen some heat. the rules for when it's time to replace a rotor.
1. if you go past minimum thickness. 2. If you can fit your fingernail inside a crack 3 if you have a crack starting at the edge of the rotor. the blue tint you see is transfer layer from the pad. that will develop cracks and it's nothing to worry about. once you see the iron splitting apart it's time to switch. |
Originally Posted by tyhackman15
(Post 1247126)
Thanks for all the info. Now I just have to decide what to replace them with (v4 wilwoods, blanks, or upgrade to 11.75...)
|
Originally Posted by OGRacing
(Post 1247127)
i'm a big fan of the V8 roadsters 11.75" kit. but that's just me :)
|
Originally Posted by tyhackman15
(Post 1247132)
The fact that replacement rotors are only ~$40 might make the upgrade a real possibility. I'll have to give them a call to discuss.
|
Originally Posted by OGRacing
(Post 1247137)
true. they use a 8x7 bolt pattern (same rotor as 90% of circle track cars). so when you burn up the $40 rotors( won't take too long) you can find quality rotors that will last. for example i'm on PFC rotors. i'm on year 5 with the same rotors. mind you i have 500hp, and do 15 track events a year. my pfc rotors have out lasted a set of dynalight calipers lol.
|
It hasn't been mentioned, but I've never heard of anyone running Wilwood pads on Miatas. Are those just the pads that came with your kit? You might be better off running something else.
|
Originally Posted by hornetball
(Post 1247164)
It hasn't been mentioned, but I've never heard of anyone running Wilwood pads on Miatas. Are those just the pads that came with your kit? You might be better off running something else.
|
As Johnny (OGRacing) said, those very fine cracks are normal and not cause for alarm. Check your rotor thickness with a caliper (the tool not the brake components) to get a feel for how far through their usable lifespan they are. You're probably not even half way through.
On a separate note regarding heat, you may also be using the wrong pad for track use, which will contribute significantly to putting more heat into your rotors than if you use higher torque pads intended for track use. Polymatrix is a whole line of pads from Wilwood of varying compounds. What is the letter designation for your pads? -Ryan |
Originally Posted by ThePass
(Post 1247220)
You're may also be using the wrong pad for track use, which will contribute significantly to putting more heat into your rotors than if you use higher torque pads intended for track use.
Polymatrix is a whole line of pads from Wilwood of varying compounds. What is the letter designation for your pads? -Ryan |
Originally Posted by ThePass
(Post 1247220)
As Johnny (OGRacing) said, those very fine cracks are normal and not cause for alarm. Check your rotor thickness with a caliper (the tool not the brake components) to get a feel for how far through their usable lifespan they are. You're probably not even half way through....
|
Originally Posted by ThePass
(Post 1247220)
As Johnny (OGRacing) said, those very fine cracks are normal and not cause for alarm. Check your rotor thickness with a caliper (the tool not the brake components) to get a feel for how far through their usable lifespan they are. You're probably not even half way through.
On a separate note regarding heat, you may also be using the wrong pad for track use, which will contribute significantly to putting more heat into your rotors than if you use higher torque pads intended for track use. Polymatrix is a whole line of pads from Wilwood of varying compounds. What is the letter designation for your pads? -Ryan
Originally Posted by OGRacing
(Post 1247233)
right. every rotor company will post minimum thickness. general if you go threw 1.5mm it's time to replace them. the dynalight we(miata people) have on our cars uses a 20mm thick rotor. if it wears down to 18.5mm it's time for a replacement.
|
Originally Posted by tyhackman15
(Post 1247235)
I agree that I am likely not near the end of the lifespan in terms of thickness (I'll measure to confirm). Should I be worried about the inconsistent marking on the rotor? Would it be worthwhile to clean them up a little with some fine steel wool or should I just let them be? Sorry again for all the questions, I don't want to cut corners or make assumptions on something as important as brakes.
|
Originally Posted by OGRacing
(Post 1247137)
true. they use a 8x7 bolt pattern (same rotor as 90% of circle track cars). so when you burn up the $40 rotors( won't take too long) you can find quality rotors that will last. for example i'm on PFC rotors. i'm on year 5 with the same rotors. mind you i have 500hp, and do 15 track events a year. my pfc rotors have out lasted a set of dynalight calipers lol.
|
Originally Posted by FrankB
(Post 1247416)
Wow! Do you have a part number for those PFC rotors you are running or the specific line? looks like they have a few different options.
299.20.0045.01 & 299.20.0045.02 Performance Friction Slotted Replacement Rotor - Late Model, Modified Blank: 299.20.0045.11 & 299.20.0045.12 Performance Friction Replacement Rotor - Late Model, Modified Note that I don't believe the P/N is correct on the OGRacing site for the slotted rotors - it's listed as the same P/N as the blank rotors, but it's an 01/02 designation at the end for the slotted rotors. -Ryan |
:facepalm:I'm an idiot, I was looking at PFC's website when I asked that question. I clearly wasn't paying attention otherwise I would have looked at OGracing considering I was asking "OGracing".. Sorry about that
|
Checked the pads, they are wilwood E's
|
All times are GMT -4. The time now is 11:10 PM. |
© 2024 MH Sub I, LLC dba Internet Brands