4pots Wrx vs 4pots STi???

[Jerm]

Esque quelqu'un peu me dire quel est la differance entre les 2 kit 4pots?

Je sai que:

Le diametre des cylindres sont:
-Wrx: 40.4mm x4
-STi : 40mm x2 + 46mm x2

Le diametre des rotors sont:
-Wrx: 16pouces
-STi : 17pouces

Il y a aussi 2 bleeder pour les calipers STi, sois 1 bleeder pour chaque 2 pots, situer dans le haut de chaque coter;
Et il y a 1 bleeder pour ceux Wrx, sois 1 bleeder pour 4 pots, situer sur le haut a l'intérieur du caliper.

J'imagine donc que les STi on un meilleur freinage que les Wrx.

Logiquement les gros pots vont etre plus fort que les petites.

???La questions est donc... pourquoi il a 2 types de pots sur le caliper STi, en quoi cela ameliore leur performance et comment fonctionne t'il???

Je vais donc faire mes recherches de mon coter et si quelqu'un peu répondre, ou trouve reponse, à ma question, svp m'informer.
Sa pourrai etre un "POST" fort interressant pour la section FREIN du forum...

Merci!!!!

[foxtrott501]

la tu compare koi au juste, 4 pot vs brembo?? ou 4po vs 4 pot

tu dois comencer par trouver les bonne info
diametre des disque c est pas 16et 17po

Front Brakes

242x16mm
Smallest Subaru front brakes, found on FWD non-abs Imprezas (93-96). The caliper and bracket are similar to those for early 260mm brakes with a shorter bracket and they use the same pads. These things fit under 13" wheels.
Applications:
93-96 Impreza 2WD.

260x24mm
This is the most common front rotor size before 2000. It was found on many Imprezas and Legacies and uses a single piston caliper and bracket. Somewhere around 96/97 the caliper/bracket/pad design changed. These fit under 14" wheels.
Applications:
90-99 Legacy non-turbo/-GT/-Outback
93-01 Impreza AWD (non RS)

276x24mm
This uses a two piston sliding front caliper and there are three caliper/bracket designs. One for the 91-94 Legacy SS/TW, an early Legacy 2.5GT/Impreza RS bracket (~96-99), and a Later RS/GT bracket (03+). It's possible to exchange some of these calipers onto taller WRX brackets as long as the pad shapes match.
Applications:
91-94 Legacy turbo
96-01 Legacy GT
96-01 Outback
00-04 Legacy non-GT
98+ Impreza RS/TS/2.5i
98+ Forester

294x24mm
295x25.5mm
This is the WRX front rotor. It uses a two piston sliding front caliper or the Subaru fixed 4-pot. The sliding caliper, bracket, and pad were changed in 03 and that's something you need to be aware of when upgrading from RS brakes or purchasing pads. The 4-pots are only on the 06-07 WRX in the US, though they were on many older non-US STis and WRXes (the black calipers with Subaru across them). Generally 16" wheels are required with these brakes but there are some 15" wheels out there that work. Also 16x6.5 Subaru wheels do not clear 4-pots.
Applications:
01 Legacy GT LTD?
02-04 Legacy GT
05-09 Legacy non-gt *
01-09 Outback
02+ Impreza WRX (including 08, which uses 2-pots)
03+ Forester
Baja

Here is the description on the different DBA rotors in this size:
Quote:
Originally Posted by WRXBrakes
DATA

DBA 1 piece:

Standard series - p/n 650 - fits 2 or 4 piston WRX w/294mm rotor

4000 series - p/n 4650 - Again fits all 2 or 4 piston 'WRX' applications. However - some street pads w/ shims on them may not fit w/ the shim as the rotor is intentionally a bit thicker to add heat mass. Take shims off - run a few weeks - if it gets noisy wait till they can fit.

p/n 4000 - Original 4000 series rotor w/ tapered HAT section to clear OUTBOARD ABS tone ring. This ABS system is all pre-2000 MY afaik.

5000 series:

p/n 5000 -the OG - fits 4 pot WRX (pre-USDM 2 pot)

p/n 5010 - fits 2 pot OR 4 pot front WRX calipers. This rotor was made when it was realized that the caliper bracket from the USDM WRX hit the rotor hardware on p/n 5000. Thus 5010 has a different design- the hardware is recessed for clearance.


Added bonus points: This rotor is also available in 5x114.3 to make it possible to swap an 05-07 STi to the subaru 4-pots for rally. Not sure where to find that rotor but I would start with rally shops.

*The non-turbo Legacy actually has a slightly different rotor that is technically 292mm in diameter. It is also slightly heavier than the WRX rotor. They can be interchanged without issue.


316x30mm
This uses a two piston sliding caliper similar to the other 2-pots, although brackets and calipers aren't compatible between other 2-pots. 17s are required with them.
Applications:
05-09 Legacy GT
Tribeca (5x114.3 bolt pattern)

326x30mm (5x100)
326x30mm (5x114.3)
STi rotor that goes with the 4-piston Brembo calipers. There are two rotors, the 04 has a 5x100mm hub bolt pattern, 05+ uses 5x114.3. The calipers all mount the same way so you can attach front Brembos to other Subarus without trouble. There were some changes to the caliper over the years that involved some sort of stiffening, so from what I can tell an 07 caliper would be slightly better than an 04.
Applications:
04+ STi

A note about the SVX:
The SVX has brakes that are about the same size as WRX brakes and the SVX has 5x114.3 hubs. However, up front, the rotor hat offset (how close or far the rotor surface is from the hub) is different from that on other Subarus. The knuckle also locates the caliper bracket in a different position. That unfortunately means that you can't just buy some 05-07 STi brembos or Tribeca brakes or something to upgrade your SVX. I'm pretty sure that in the rear things are compatible with other Subarus.


Rear Brakes

266x10mm
The most common Subaru rear rotor. It uses a single piston sliding caliper, of which there are a few variations. Early Legacy sedans (non-turbo) and Imprezas have a smaller piston than Legacy wagons and turbos, and there are a few bracket/caliper revisions.
Applications:
90-99 Legacies/Outbacks with rear discs non-turbo
93-07 Imprezas with rear discs (except sti, 06-07 wrx)
98-08 Foresters with rear discs
Bajas

274x10mm
This rotor is on most 05+ Legacy/Outbacks. The exception is the LGT. Parking brake is 170mm, and I'm not sure on compatibility with other models.

286x10mm
08+ impreza/wrx and 09+ forester (with rear discs), uses a 190mm parking brake and 1-pot sliding calipers. I'm not sure on the compatibility with other cars, but it seems to be the same caliper mounting as other 1-pots.

290x10mm
This is well known as the H6 rear rotor. The Legacy caliper is the same as most other 99-07 1-pot Subaru calipers so you can upsize to this rotor simply by purchasing the brackets and correct pads
Applications:
00-04 Legacy/Outback non-brighton
SVX (5x114.3)

Bonus points: SVX bracket + this rotor in 5x100 = old style caliper H6 upgrade (probably).

266x18mm
This is the Legacy turbo rear rotor. The caliper is similar to the other calipers but is wider to accomodate the vented rotors. I hear it was also found on the v1 WRX (93-94).
Applications
91-94 Legacy turbo

290x18mm (170mm parking brake)
290x18mm (190mm parking brake)
This is a new rotor size for Subaru (in the US anyway). It uses either a 2-piston opposed caliper or a 1-pot slider. The 2-pot will not bolt up to other Subarus without something like the Kartboy brackets or having a new backing plate pressed onto the spindle. There are three versions of this rotor, one is for the regular 170mm parking brake, the others are for the sti 190mm parking brake in both 5x100 and 5x114.3
Applications:
05+ Legacy GT (1-pot)
06-07 WRX (2-pot)
SVX (5x114.3) (only in JDM-land)
Some older non-us spec-b Legacys and wrx/sti models (see rear brake redux)

Note: The LGT uses a different brake line than older Legacies and Imprezas. So I think you need to grind down part of the caliper where the line mounts to get it to work on an Impreza. The LGT lines are a different shape and mount and a different angle and you can't use them.

316x20mm (5x100)
316x20mm (5x100, 170mm parking brake)
316x20mm (5x114)
STi brembos. There are multiple versions of this disc. One for the 04 STi, one for 05-07, one for 08+ and one with a 170mm parking brake drum. There's an explanation how to install rear brembos on other cars a little farther down. 08+ sti rear rotors have a different backspacing.
Applications
04+ STi

http://forums.nasioc.com/forums/showthr ... ?t=1265631

[jefars]

+1 wrx et STI 4pot (pas sti brembo) = meme rotor

[-Johnny-]

+1 wrx et STI 4pot (pas sti brembo) = meme rotor

***rotor arriere est different avec un R180.

[jefars]

+1 wrx et STI 4pot (pas sti brembo) = meme rotor

***rotor arriere est different avec un R180.

pas de 4pot arr.

[-Johnny-]

I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.
I must think before I respond.

[Jerm]

Je compare 4pots vs 4pots!

J'essaye aussi de comprend les differents diametre des cylindres du caliper STi et quesque sa change dans le comportement du freinage?

[Jerm]

mai comme c'est la tu ma donner un peu de lecture a faire

[jefars]

Je compare 4pots vs 4pots!

J'essaye aussi de comprend les differents diametre des cylindres du caliper STi et quesque sa change dans le comportement du freinage?

dur de comprendre la difference avec de mauvais spec.

[jefars]

Juste pour comprend il ya les old STI JDM (4pot-2pot) et le new STI USDM(Brembo):

Front:
294x24mm
295x25.4mm
This is the WRX front rotor. It uses a two piston sliding front caliper or the Subaru fixed 4-pot. The sliding caliper, bracket, and pad were changed in 03 and that's something you need to be aware of when upgrading from RS brakes or purchasing pads. The 4-pots are only on the 06-07 WRX in the US, though they were on many older non-US STis and WRXes (the black calipers with Subaru across them). Generally 16" wheels are required with these brakes but there are some 15" wheels out there that work. Also 16x6.5 Subaru wheels do not clear 4-pots.
Applications:
01 Legacy GT LTD
02-04 Legacy GT
05+ Legacy non-gt
01+ Outback
02+ Impreza WRX (including 08, which uses 2-pots)
06-07 Impreza WRX 4pot
old STI JDM and non-US STis
03+ Forester
Baja

326x30mm (5x100)
326x30mm (5x114.3)
STi rotor that goes with the 4-piston Brembo calipers. There are two rotors, the 04 has a 5x100mm hub bolt pattern, 05+ uses 5x114.3. The calipers all mount the same way so you can attach front Brembos to other Subarus without trouble. There were some changes to the caliper over the years that involved some sort of stiffening, so from what I can tell an 07 caliper would be slightly better than an 04.
Applications:
04+ STi


Rear:
290x18mm (170mm parking brake)
290x18mm (190mm parking brake)
This is a new rotor size for Subaru (in the US anyway). It uses either a 2-piston opposed caliper or a 1-pot slider. The 2-pot will not bolt up to other Subarus without something like the Kartboy brackets or having a new backing plate pressed onto the spindle. There are two versions of this rotor, one is for cars with an R180 rear diff which has bigger parking drums.
Applications:
05+ Legacy GT (1-pot)
06-07 WRX (2-pot)
SVX (5x114.3) (only in JDM-land)
Some older non-us spec-b Legacys and wrx/sti models (see rear brake redux)

316x20mm (5x100)
316x20mm (5x100, 170mm parking brake)
316x20mm (5x114)
STi brembos. There are now three versions of this disc. One for the 04 STi, one for 05+, and one with a 170mm parking brake drum. There's an explanation how to install rear brembos on other cars a little farther down.
Applications
04+ STi

bref, meme si le brembo on 4cylindre a l'avant et 2 a l'arriere, on les appelle Brembo STI et non 4pot-2pot STI.

et le freinage des 4pot-2pot STI et 4pot-2pot WRX est le meme, mais de memoire, le lettrage dessus n'est pas le meme (un en relief l'autre non).