Phaz3

And i think you all are correct that it may not be much of, if any upgrade doing the rears. The fronts have its usefulness on track from what ive read from a few persons who have done it. However getting the rears to work up may be more of a look factor by filling up that space with 18s and will provide some usefulness for persons with X rear brakes on hand with nothing to do with them.

kyoo

iTrader: (29)

i love my evo x front brakes, honestly they feel amazing. 320mm for the evo 9 is just way too small for track days

EVOFans

An alternative to the rear EVO X brake upgrade is to just convert your EVO VIII/IX rear brake rotor to 330MM
There are some japanese vendor which offer this upgrade but they are not cheap as the rotor is 2 piece
Some of the vendor who offer this upgrade: Biot, Deck Mechanical Power(Garland rotor), Kyushu Danji
You can reach out to JDM vendor like rhdjapan or nengun for more info

Phaz3

Are those rotor upgrades meant to work with the stock rear brembo caliper though?

Construct

iTrader: (4)

Evo X rear brakes should give 10% higher brake torque, which matches the 10% front increase of the Evo X front brakes.

I'll PM you with my incomplete spreadsheet of BBK calculations.

Yes, it's a cheap way to get more thermal capacity up front. Hard to beat $400 for take-off calipers and $200 for Centric rotors price-wise. The brake torque increases slightly too, which might explain why a few people claim better brake feel after the upgrade.

Construct

iTrader: (4)

The stock calipers can't accept a larger rotor.

To upgrade the rotor, you either need to install calipers that sit farther away from the center of the hub, or somehow space out the stock calipers with a custom upright.

kyoo

iTrader: (29)

s2ks have a very simple solution to that from ballade:

https://balladesports.com/collection...otor-kit-front

it's not just heat. bigger rotors, more brake torque. i haven't had issues with any kind of overheating etc on the track with the evo x rotors, pretty impressive

Construct

iTrader: (4)

Not necessarily. Torque is a function of rotor diameter and the piston area of the caliper. Also depends slightly on the brake pad width, but that's minimal.

Many of the BBKs have less piston area than the stock caliper to keep the brake torque similar even with larger rotor diameters. The AP Racing Radi-CAL 9660 setup should have similar brake torque to stock despite having giant rotors.

kyoo

iTrader: (29)

all else equal, basically yes but technically depends on piston yes. the ballade kit is basically a bolt on to utilize larger rotors on stock calipers. my buddy has this kit for front and rear on his car, the difference was pretty stark

Balrok

iTrader: (15)

An option to increase brake torque with a larger setup also is to get that evasive Bosch Motorsports ABS ecu. Would allow for something that wasn't made for "oem spec".

Dallas J

iTrader: (1)

Only like 10k for that right? Even Im not that crazy

Balrok

iTrader: (15)

IF you could find it lol.

Dallas J

iTrader: (1)

Well it looks like the bigger rear rotor with the X caliper shifts bias back to compensate for the forward shift of going to X front calipers. If you did go that route, you would have to always looks for X kits in the future if wanting to go bigger since kits in general use smaller piston area to compensate.

If someone wants to send me an EvoX rear caliper I can 3d scan it and add it do my rear upright model to see what would need to change to fit. I suppose I could also just compare the uprights themselves... But would be better to have the caliper itself.

Phaz3

If i had a rear caliper i would have definitely sent it. Anyone wants to send one?

EVOFans

Yes, the kit come with an adapter to run space the stock rear caliper to run the larger rotor
One of the kit offered is this: http://kyushudanji.shop-pro.jp/?pid=26813585