Two-Piece Rotors (OEM Diameter) for the FiST, will these work?

[SneakyPete]

Trying to track down some two-piece rotors in OEM front rotor sizes and found these. They are pretty close on diameter, only 1mm wider than the OEM fronts. Do I need to check the bolt circle spacing and anything else to determine if they will fit? I realize the holes would need to be drilled for mounting but otherwise?

http://www.compbrake.com/product/ford-sierra-escort-cosworth-4wd-rear-rotor-bells-pair/

 

[Sekred]

You need to check height and centre hole dia, Specs below for Fiesta ST. You need to know D and E spec .



Diameter
278mm
Height
44mm
New Thickness
23mm
Min Thickness
21mm
Centre Hole
63.5mm
Studs
4 x 108mm PCD

 

[M-Sport fan]

Those are nice, but for the shipped price to get them here, you are a good ways towards the cost of a good WHOLE/COMPLETE front big brake kit made to fit our cars, and then you get the benefits of a FIXED CALIPER as well.

 

[TyphoonFiST]

Why Would you want these if you can get a Cryoed slotted one piece for cheaper? And not have to worry about your fasteners falling out of the rotors.

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[SneakyPete]

Dont the Wilwood kits from 2JR have issues with not having dust covers and cracking issues in the rotors I thought I read, or was that just for the slotted and/or drilled ones and not for the blanks?

 

[M-Sport fan]

Yes, but there ARE other similarly priced kits out there which do not have these problems (K-Sport, Tarox, etc.).

 

[SneakyPete]

I like the K-Sport kit but I do not want to have to run spacers. The Tarox kit has one-piece rotors and I am also trying to shed a bit of weight wherever possible. Any other 2 piece kits that will work with OEM wheels? The Brembos are crazy expensive so they are out.

 

[M-Sport fan]

I like the K-Sport kit but I do not want to have to run spacers. The Tarox kit has one-piece rotors and I am also trying to shed a bit of weight wherever possible. Any other 2 piece kits that will work with OEM wheels? The Brembos are crazy expensive so they are out.

I understand the weight reduction thing, but also remember that even just the replacement 'ring' rotors for almost all 2 piece rotors cost substantially more than even the best full one piece replacement rotors.

I am hoping that eventually, Stop Tech will 'get with the program' and offer a kit which can be used with more than just ONE wheel (17x8 Rota Grids) like is currently the case.

 

[M-Sport fan]

I like the K-Sport kit but I do not want to have to run spacers. The Tarox kit has one-piece rotors and I am also trying to shed a bit of weight wherever possible. Any other 2 piece kits that will work with OEM wheels? The Brembos are crazy expensive so they are out.

I understand the weight reduction thing, but also remember that even just the replacement 'ring' rotors for almost all 2 piece rotors cost substantially more than even the best full one piece replacement rotors.

I am hoping that eventually, Stop Tech will 'get with the program' and offer a kit which can be used with more than just ONE wheel (17x8 Rota Grids) like is currently the case.

Some of their kits and setups make even the Brembos seem inexpensive, but I am starting to think I will either save up (over MANY years!) for an AP Racing front kit, or else just live with the factory calipers and a great pad/rotor.

 

[kevinatfms]

I assume you already have a good set of track day pads, lines and fluid....

Saving weight should be a last step measure on a cheap car like the Fiesta. I cannot fathom why someone would need 2 piece rotors on a Fiesta. Focus on the rest of the braking system instead and add a little more power if you need to go faster.

 

[KKaWing]

There's always the directional vane thing with 2 piece rotors. I have yet to see them do directional vanes for one pieces outside of an S2000. They help immensely with cooling.

These guys: scienceofspeed.com

Back in May we published our findings of data logging factory and Speed Engineering directionally vaned brake rotors. The testing was done in a controlled environment at the 21 turn Inde Motorsport Ranch in Wilcox, AZ. Testing was performed using an onboard infrared sensor and controller data logged against vehicle speed using the AEM EMS to verify braking speeds matched between testing of the factory and Speed rotors. Brake pads used were Carbotech XP10/XP8 and the fluid used was Motul RBF600.



more about the testing can be found at the original post here:
https://www.s2ki.com/s2000/topic/867...-brake-rotors/

The testing showed the directionally vaned rotors, which are more efficient in cooling due to the pumping effect of air through the rotor were able to shed heat faster and trend cooler than the straight vaned factory rotors - running an average of nearly 60 deg F cooler and nearly 100 deg F cooler over a 22 turn lap. The question then became - what is the long term effect of the use?



long term update
Previously, our NASA TT-B prepped S2000 had rotor failure (a complete crack running through the rotor) within 5 days of track use using a new set of factory rotors. A "day" typically includes four 20 minute timed sessions. The factory rotors were used with the same type of Carbotech brake pads that we use today. These pads generate high friction and high heat to go along with it. In addition, the brake pads typically were good for 10 days using factory rotors. Since May's testing, we promised to report on long term durability testing. Using a new set of Speed Engineering rotors and Carbotech XP10/XP8 brake pads - we have since logged 13 days of track use. These 13 days included the same tracks driven in the 5 days with the factory rotor - so the testing is quite comparable.

After 13 track days, the rotors are still in fine condition with signs of only microscopic fractures. We estimate that they will be good for another 2-4 days. In addition to the increased rotor life, we have also seen about a 20-30% increase in pad life. Also, the brake fade we would typically experience with the factory rotors has now not been experienced since the installation of the rotors.

We've been very happy with the results, and hope you enjoy the data provided. With the cost of the Speed Engineering rotors being only slightly more than generic aftermarket brake discs, and less expensive than factory rotors and aftermarket slotted rotors - the Speed Engineering rotors seem like an obvious choice regardless of the use being for street or track use. In addition to the rotors, we can't help but be absolutely thrilled with the brake pad selection. We have managed over the past 10 years with the S2000 to try more than a dozen brake pad compounds. The Carbotech line of pads, especially the XP10/8 combination has proven to be the best performing and most rotor friendly combination we have ever tried. The brakes are now one aspect of the car that we have absolutely no complaints about.

more info on Speed Engineering directional brake rotors:
http://www.scienceofspeed.com/produc.../brake_rotors/

more info on Carbotech brake pads:
http://www.scienceofspeed.com/produc...000/Carbotech/

Should you have any questions, please don't hesitate to drop us a line.

cheers,
-- Chris
General Manager
ScienceofSpeed, LLC
ScienceofSpeed is offline

Edit: qoute from s2k forums

 

[BRGT350]

I assume you already have a good set of track day pads, lines and fluid....

Saving weight should be a last step measure on a cheap car like the Fiesta. I cannot fathom why someone would need 2 piece rotors on a Fiesta. Focus on the rest of the braking system instead and add a little more power if you need to go faster.

I am with Kevin on this one. I love the look of a 2-peice rotor, but not sure why you really need one with a floating caliper. There is some weight reduction for sure, and that helps with rotational inertia and unsprung weight. I just don't see there being enough pros to outweigh the cost and limited performance gains. Switching to a multi-piston aluminum caliper would be a better start. That would be well after I have logged enough track time (both actual and class) to be able to know that the limiting factor is now the car and not the driver.

 

[codestp202]

The pro's of the wilwood kit is lighter weight, better clamping force, more choices in pads and rotors, and the two piece rotor design. I have the gt spec rotors on my kit and they are directional vanes. I destroyed my OEM calipers on the track, and for heavy track use, I don't believe the Fiesta's stock brakes with lines,fluid, and rotors will keep up. I melted the paint and turned them black from heat at Laguna seca.

If you're tracking the car hard, running low TW tires 100-200, and you are fast, a BBK makes a lot of sense.

I've had no issues with removing my dust shields, and I run brake cooling ducts to the wilwood rotors.

The rears on the other hand are fine in my opinion.

 

[blurred]

Who cares about the reasons, if he wants it and can afford it then its a great upgrade. I run 2pc on my sti and have been for years, saves a lot of weight but also get great cooling, even pad wear etc...

Coleman Racing will make custom hats and has a number of rotor options. My hats are made by GiroDisc and the rotor rings are coleman, I have been through a couple of sets and they are the high quality, would recommend.

 

[kevinatfms]

Another thing i have found is that brake temps vary on the tracks that you run. As above, someone at Laguna Seca can barely make the stock brakes last a day while others(myself included) can run a full track day on stock brakes with some upgrades. Power level, tires and driving style can also add to the temp threshold of the stock braking system.

As for the comment above. I dont care what he spends his money on but if I were in his shoes i wouldnt want to waste a few hundred dollars a piece on rotors that arent going to help him if he doesnt have the auxiliary parts to back up that brake upgrade. Does he have lines? High temp fluid? Ducting? All those questions were unanswered.

You compared your Subaru STi which comes from the factory with fixed, two piece, aluminum piston calipers that can handle the temperature stress of a track day. The Fiesta ST while capable has a braking system that still has the factory floating calipers which have a tough time handling the heat associated with a track day event. This heat leads to distortion of the bridge of the caliper which then leads to uneven brake wear. A fixed caliper does not have these issues as they have two bridged sections with pistons that force the pads in from both sides of the rotor.

In the end its up to the OP but id stay away until you buy the full BBK. Use the money toward upgrades to the stock brakes(lines, fluid, ducting) or head down the BBK route.

 

[TyphoonFiST]

Another thing i have found is that brake temps vary on the tracks that you run. As above, someone at Laguna Seca can barely make the stock brakes last a day while others(myself included) can run a full track day on stock brakes with some upgrades. Power level, tires and driving style can also add to the temp threshold of the stock braking system.

As for the comment above. I dont care what he spends his money on but if I were in his shoes i wouldnt want to waste a few hundred dollars a piece on rotors that arent going to help him if he doesnt have the auxiliary parts to back up that brake upgrade. Does he have lines? High temp fluid? Ducting? All those questions were unanswered.

You compared your Subaru STi which comes from the factory with fixed, two piece, aluminum piston calipers that can handle the temperature stress of a track day. The Fiesta ST while capable has a braking system that still has the factory floating calipers which have a tough time handling the heat associated with a track day event. This heat leads to distortion of the bridge of the caliper which then leads to uneven brake wear. A fixed caliper does not have these issues as they have two bridged sections with pistons that force the pads in from both sides of the rotor.

In the end its up to the OP but id stay away until you buy the full BBK. Use the money toward upgrades to the stock brakes(lines, fluid, ducting) or head down the BBK route.

Doesn't an STI COME with Brembos? For some odd reason I thought they did...🕺

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[kevinatfms]

Doesn't an STI COME with Brembos? For some odd reason I thought they did...🕺

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Yes, stated that very clearly. An STi comes with a fixed, two piece caliper(they are not monoblock calipers).


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[SneakyPete]

Has anyone tried the VMAXX kit from Pumaspeed? 2 piece rotors and fits under 15in wheels so should work fine for 17" of course.

http://www.pumaspeed.co.uk/car-Fiesta-ST-180-16-Ecoboost_1_326.jsp

 

[KyleS]

BTW - I reached out to DBA Rotors and they stated they do not plan to develop two-piece rotors for our application due to very small weight savings and the market size, "not large enough for us to chase it".

But good news, they mentioned they want to try to develop a rotor in their 4000 series for the Fiesta ST but no promises on if or when.

http://www.dbausa.com/4000-series/

 

[M-Sport fan]

^^^THANKS!

I was going to ask IF they offered their one piece 4000 series with the directional vanes as these would be my choice to try once I needed replacements.