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Caliper body looks pretty much the same size.
Piston size looks the same.
Takes the same brake pads.
EVO8 calipers look beefier around back side of pistons (at least where the Brembo sticker is).
EVOX calipers look thicker on caliper halves, in area past pistons.
Thanks for posting. I always like comparing stuff.
Even though they look close, they are not interchangeable, correct?
Directly interchangeable, no.
But you only need to drill out mount holes from 12 to 14 mm, get new bolts
and larger rotors (and obviously 18" wheels).
I guess the larger rotors (12.6" to 13.8") and the thicker caliper webbing
(stiffer, absorb heat a bit better???) make a big enough difference on the track,
not sure it would even be needed on the street. I own the stuff now, but not sure I
would have ponied up for the X stuff, if I had seen direct comparison anywhere else
of the calipers
this article on stock IV vs X is encouraging
"its larger Brembos, which “allowed for braking much deeper into turns,” according to Nagl, feel stronger and easier to modulate than before;"
i did this swap over the winter break, and have been very impressed with its performance. easier to threshold, mash on the pedal, etc, and the pedal just feels firmer. i'm willing to bet the caliper itself is stiffer, which is obviously a good thing. i'm NOT a mechanically inclined person at all, but was able to drill the holes with relative ease.
I had Evo X Brembos on my previous IX exactly as an initial winner setup (Alcon steel pistons rust and where I live they put some aggressive liquid on tarmac to fight ice, so I decided I want to have different set of brakes for winter and summer). Well, with a respray/rebuild I did (just to do all-new), new Performance Friction rotors and decent pads (PAGID RS29?) they came close to $2,000 which is close again to Alcon moboblock 6-piston setup If you don't plan rebuild, have salvaged X rotors it might be an inexpensive upgrade. I've ended up with upgrading Alcons with titanium pistons (set was around $200, custom-made from Russia) to keep all-year brakes. Before going RS brakes and 15" rims for winter
From my POV having 18" and X Brembos for winter isn't something you want to do, there's too much of braking power on ice and snow you don't want it... RS OEM "gravel" brakes (2 piston fromt / 1 piston rear) and a set of 15" wheels + tires with studs is a way to go. I got my RS brakes (all-new, TRW rotors and Ferodo2500 pads) for <$800 which is a bargain IMHO. Fronts are easy to find on eBay, rears are actually more expensive and hard to find (15" rims don't play well with rear 2-piston Brembos, but there are ways to go).
i did this swap over the winter break, and have been very impressed with its performance. easier to threshold, mash on the pedal, etc, and the pedal just feels firmer. i'm willing to bet the caliper itself is stiffer, which is obviously a good thing. i'm NOT a mechanically inclined person at all, but was able to drill the holes with relative ease.
I had Evo X Brembos on my previous IX exactly as an initial winner setup (Alcon steel pistons rust and where I live they put some aggressive liquid on tarmac to fight ice, so I decided I want to have different set of brakes for winter and summer). Well, with a respray/rebuild I did (just to do all-new), new Performance Friction rotors and decent pads (PAGID RS29?) they came close to $2,000 which is close again to Alcon moboblock 6-piston setup If you don't plan rebuild, have salvaged X rotors it might be an inexpensive upgrade. I've ended up with upgrading Alcons with titanium pistons (set was around $200, custom-made from Russia) to keep all-year brakes. Before going RS brakes and 15" rims for winter
From my POV having 18" and X Brembos for winter isn't something you want to do, there's too much of braking power on ice and snow you don't want it... RS OEM "gravel" brakes (2 piston fromt / 1 piston rear) and a set of 15" wheels + tires with studs is a way to go. I got my RS brakes (all-new, TRW rotors and Ferodo2500 pads) for <$800 which is a bargain IMHO. Fronts are easy to find on eBay, rears are actually more expensive and hard to find (15" rims don't play well with rear 2-piston Brembos, but there are ways to go).
that's a lot of work and air introduced to swap brakes - i don't drive my evo in the winter anyway
Since the Evo X caliper bolts on the 789 spindle after drilling the bolt holes to 14mm, would a big brake kit for an Evo X bolt up to a 789 with the same mod? The bolt location should be the same and the rotor offset is the same, so the adapter would bolt up and everything should line up, no?
Apr 24, 2018, 06:50 PM
If you don't plan rebuild, have salvaged X rotors it might be an inexpensive upgrade. I've ended up with upgrading Alcons with titanium pistons (set was around $200, custom-made from Russia) to keep all-year brakes. Before going RS brakes and 15" rims for winter 
