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Discussion Starter #1
So I ordered rotors and pads for my upcoming track day.

Centric Sport Rotors Front
Centric Rotors Rear
Hawk DTC-30 Front Pads
Hawk HPS Rear Pads

I was going to make some air scoops from some Kydex then after opening the new front rotors I noticed an issue.

The 13.1" (335mm) OEM rotors have the opening for the venting at the hub facing out towards the wheel. This makes it hard to get fresh cool air into the hub for the rotors from any air scoops or brake ducting.

Well when I opened the new StopTech/Centric rotors I noticed they followed the OEM design which is a bummer. I checked photos of the Slotted StopTech and they are designed the same way. And apparently PowerStop, EBC, Hawk don't have any listed part numbers for the 2014.5+ (13.1") rotors.

Here is a photo of what I am talking about (PN# 125.65146)
IMG_20161010_183559873.jpg
 
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I'd just get the air deflectors that I think Velosatech makes. I believe they are the ones that did research at the track measuring temps and had an improvement.

As far as rotors, I would use what ever was cheapest at Advance Auto Parts. They have always worked as good as any other rotor on my track dedicated Mustang and when they crack I get them replaced under warranty.
 

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Don't spend a lot of $$$ on fancy rotors. Like hopper said, blanks are best.


Sent from my iPhone using Tapatalk
 

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Discussion Starter #4
I'd just get the air deflectors that I think Velosatech makes. I believe they are the ones that did research at the track measuring temps and had an improvement.

As far as rotors, I would use what ever was cheapest at Advance Auto Parts. They have always worked as good as any other rotor on my track dedicated Mustang and when they crack I get them replaced under warranty.
Don't spend a lot of $$$ on fancy rotors. Like hopper said, blanks are best.


Sent from my iPhone using Tapatalk

Both you guys missed the point of the post. I didn't buy some fancy slotted rotors. I bought the Centric Sport rotors which are basic high carbon vented rotors.

The point is that the Centric/StopTech rotors vent on the outside towards the wheel. Which means the Air scoops/etc are less effective.
 

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No, I got your point. Sounds like what you're saying is the OE design doesn't have the vent opening at the center and on the inside of the rotor and that is how the aftermarket is making them also. I can't confirm or deny cause I have not looked on my own car. But either way if that is how it is made you have to work with what you have. So make or get air deflectors to blow toward the rotor. Better than nothing.
 

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Discussion Starter #6
No, I got your point. Sounds like what you're saying is the OE design doesn't have the vent opening at the center and on the inside of the rotor and that is how the aftermarket is making them also. I can't confirm or deny cause I have not looked on my own car. But either way if that is how it is made you have to work with what you have. So make or get air deflectors to blow toward the rotor. Better than nothing.
Unfortunately air scoops wouldn't do much on a 2014.5+ from the way it looks with these rotors. First you have a dust shield that is blocking the back of the rotor. Second you don't have vent openings in the hub area so fresh air would have a very small area to help cool.
 

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If you're using it on the track then the dust shields should be removed anyway. You just have to make the best out of the system you have to work with. Good luck with it.
 

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Scooping air on the rotor, vent side inside or outside is still beneficial. It's not like it wont work. You obviously still need to adjust for the dust shield, by either drilling holes, removing or cutting a gapping hole into it.
 

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Discussion Starter #9
Scooping air on the rotor, vent side inside or outside is still beneficial. It's not like it wont work. You obviously still need to adjust for the dust shield, by either drilling holes, removing or cutting a gapping hole into it.
It is not that it isn't helpful. I was referring to the idea of them not showing as big as gains as a rotor that vents towards the inside (hub side)
 

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Discussion Starter #10
Bump

Unfortunately even shopping for rotors is fun since alot of stores and brands want to list they make rotors for the 2014.5+ models and then you look and they are only 320mm sized rotors.
 
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Bump

Unfortunately even shopping for rotors is fun since alot of stores and brands want to list they make rotors for the 2014.5+ models and then you look and they are only 320mm sized rotors.
This is what I've been finding 2+ years later too! LOL

Disregard my last post since I don't even think the 2 piece 332x32 Aerorotors in that ST40 kit are available as a standalone purchase or fit the stock calipers and they may have the same vent design as the ones you bought from centric, although they should have improved cooling per the marketing literature and cost. Someone else also posted the OEM 18" wheels don't clear the ST40 calipers, not sure if spacers were a viable or worthwhile fix.
 

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Anybody know the thickness/dimensions for new oem 13.1 ST rotors (332 x ?) and the thickness for the oem 13.7 RS rotors (350 x ?)?

Thanks
 

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Anybody know the thickness/dimensions for new oem 13.1 ST rotors (332 x ?) and the thickness for the oem 13.7 RS rotors (350 x ?)?

Thanks
I can get the thickness of the RS rotors tomorrow. I don't have the stock front rotors and more. You should be able to measure your own.

Sent from another garage.
 

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I can get the thickness of the RS rotors tomorrow. I don't have the stock front rotors and more. You should be able to measure your own.

Sent from another garage.
Don't bother measuring, im sure ill find the dimensions in cyberspace and was curious how much thicker they were vs the 13.1 ST rotor.

I'm seeing 332x32mm listed for the stoptech aerorotors and wondering if they are oem thickness which means they should work with stock calipers if available for purchase outside the ST40 kit. So far, Ive only been able to locate the 320x25 aerorotors sold individually as an upgrade.

Thanks for offering to measure!!
 

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so next question is what is the max rotor thickness the stock calipers can fit??
 

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Don't bother measuring, im sure ill find the dimensions in cyberspace and was curious how much thicker they were vs the 13.1 ST rotor.

I'm seeing 332x32mm listed for the stoptech aerorotors and wondering if they are oem thickness which means they should work with stock calipers if available for purchase outside the ST40 kit. So far, Ive only been able to locate the 320x25 aerorotors sold individually as an upgrade.

Thanks for offering to measure!!
Too late. They are 25mm.

Sent from another garage.
 

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I wonder if there is a different bracket we can use (Mazda?) in order for the front oem ST calipers to accept the bigger 350mm RS 13.7" rotors>>> Frankenbrake Front????? :smile:

or would there be a oem wheel clearance issue similar to the Brembos??
 
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