PartShippers

That I dont know for sure, but to be safe, if you are going through the trouble to get the rotors and the caliper bracket, you might as well get the new caliper that goes with the rotor and caliper bracket. Subaru sells the caliper as an entire kit that comes with the caliper bracket. I dont know for sure if the 2.5i and the GT rear calipers use the same brake pad part. But if you're going to upgrade all of this, you might as well make it more uniform. This will be easier for you to buy replacement parts later when you know that all of your brake parts are now GT parts rather some parts being GT and others are 2.5i and so forth.

 

I think the GT brake setup is good enough for the commute to and from work.. but when you look from a performance standpoint when driven hard or spiritedly, this is where it starts to lack and limit, starting with the brake pads.

 

The car is just simply heavy overall for the size of the pads and calipers and even rotors that it's equipped with once you start to carry more momenutm and speed. I've really pushed hard on the stock size rotors to where the brakes were really taking a beating here and there. The concern is that it can't take that kind of beating for longer periods without some kind of heat capacity help or some kind of better cooling effect on the heat disapation (sp?).

 

In general for a stock powered GT and me running on 245 wide r-compound tires, the car really needs something like 15" rotors and brake ducts to survive qualifying-pace laps for 25-minute long sessions in 90F. Right now with the stock brake setup with just better rotors, pads and fluids, I can only run about 5 or 6 laps before I experience the beginning signs of brake fade in the 90F. It's a really bad sign when my rotor temperatures are reaching 2200+F. The brake pads I have are designed to operate in the range of 1200F to 1800F. That 400F of extra heat is where I'm getting my brake fade. I need to tone down my entry and transitions into the brake zones to brake safely.. if I continue to barrel down the brake zone at the very last split second before I jam on the brakes, the car will surely see the grass or sand trap at the end of the straight within the next few following laps.

 

Normally I end up taking 2 cool down laps and end my sessions shorter now because of the amount of heat my brakes generate and it takes a lot longer for the brakes to cool down than it is to heat up..

 

Now only if I can get my hands on some Alcon-water-cooled brakes that the WRX WRC car has.. then I can left foot brake all day long and have my throttle fully pegged to the floor through the entire course.

2 of my friends(close) work for Stoptech. If there is anything you need me to look into i'll try. I don't ask them on my behalf though.

i've done hpde's at VIR before...i know turn one very well...thats alot of speed going into that ...as well other parts of the course. This is (been a long time) next to the concession area) and with those tires i had a hell of a time keeping it from rotating. inside rear was off the ground though.(i was trying different lines)

http://www.imagestation.com/picture/sraid225/pbf02a093a1434acae245495d8b777dca/e82ffe5b.jpg

I've had many many many cars i've put on track...

http://www.imagestation.com/picture/sraid225/p2586ae649f0f70384c672045fe3dd0d0/e82ffe4b.jpg

took 2nd place in a time trial event in my old prelude at Watkins Glenn

http://www.imagestation.com/picture/sraid225/p6e066ad37c2be90ec419459ad6abd368/e82ffe4e.jpg

This is what i was know for nationally...who needs brakes doing this though?

http://www.imagestation.com/picture/sraid225/pc21e8195254bc9b0172668852daad3c6/e82ff1eb.jpg

This is what i have now...and will eventually have alot of fun in after the motor swap

http://www.imagestation.com/picture/sraid225/p408109910107c96fb77faababcecc074/e82ffe55.jpg

thank you for your help.

Jeff

nah, you need the caliper brackets as well.. when you go with larger rotors, you need to get the corresponding caliper bracket since you are forced to relocate the caliper location in respect to the new larger diameter rotor.

anyway to know for certain if i can get away with a new rear caliper bracket and rotors from a GT/Spec B.

right. thats what i was asking. I'll be purchasing the front rotors/calipers with brackets/pads...and was asking if i needed the rear caliper bracket and rotors from the GT/Spec B and still be able to use my stock 2.5i rear caliper.

thank you kindly. I think the stock GT stuff is sufficient...just need to upgrade pads and fluid

Jeff

Keefe,

anyway you can confirm any of this for the 08' 2.5i limited? I'm looking to purchase the front calipers/rotors/pads off a gentleman for the front of my 08' limited(he has an 07' spec B). anyway to know for certain if i can get away with a new rear caliper bracket and rotors from a GT/Spec B.

Also...there isn't any differences between the GT and Spec b brakes are there?

thank you very much in advance. Use of the vehicle is everyday(safety) and i may autox it at some point here and there so i'll upgrade pads and fluid. I have plenty of motul at home so i'll just use that.

ah thank you unclemat.

 

I had a total brain fart, at my office I have my 2005 Legacy brochure that's just sitting here.

 

there's also a difference in the 2.5i and 2.5i limited.

 

the 2.5i is 10.8" front vented/10.6 rear solid

the 2.5i limited is 11.5 front vented/10.6 rear solid

the 2.5GTs (both non and limited) are 12.3 front vented/11.3 rear vented.

 

the only part that I don't know for sure is the rear drum hub for both cars.. if they are the same, then the only thing you need in the rear would be the caliper bracket. I believe both the GT and the 2.5i use the same brake pad (which also uses the same pads as the 2002 WRXs I think, but call up Eric at Brakeswap.com for that answer since I dont have my brake pad chart handy.