Caliper option, maybe not

[Uncle86]

Went on to Ebay today to search 06 WRX calipers and found what looks like 4pot calipers that are remanufactured. Currently Im already running Stoptech Sport pads, Sport rotors, Radium cylinder brace and Stoptech stainless lines (already enough for my taste). I felt something was missing so I searched for a caliper upgrade and those showed up on ebay along with used JDM calipers which I already planned on possibly picking up from Upgarage on my trip to Japan later this year (thumbs outta breathe)

https://www.ebay.com/itm/392587153939

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[EndlessAzure]

If you ever plan on driving the car in a performance setting, make sure the brake balance is appropriate for the car.

[Uncle86]

still havent had the chance to put real stress on the brakes to know if I really need the upgrade. Ill wait til after a couple Auto X events...if they ever start up again

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[AngelGT86Racer]

Originally Posted by Uncle86

still havent had the chance to put real stress on the brakes to know if I really need the upgrade. Ill wait til after a couple Auto X events...if they ever start up again

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The factory calipers can take you pretty far with a decent set of pads and fluid.



I've been autox-ing mine for two seasons on 200tw tires. I had Hawk HP+ and ATE Type 200 for the first season and a half. Never needed more than that for autox. They're not enough for track, though(the HP+). Then I stepped up to DTC-60 pads and Motul 600 and I didn't have a problem at track again. This is while running a semi-decent intermediate pace with just a header and tune. (2:10 Thill East, 1:30 West, 2:08 BRP 13CW)

My 0.02.



Side note, I'm in the SF Bay Area as well. I'm hoping to hit Lotus Club again if their event next month happens as well as Santa Clara Corvettes at Cow Palace. Perhaps I'll see you out at an event.

[Uncle86]

advice from the both of you appreciated

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[Racecomp Engineering]

The 06 WRX calipers use the stock rotors. It's a decent caliper...but not a significant upgrade over stock. It does shift some mechanical brake bias to the rear so it may not be the best choice for everyone (I would not recommend that caliper with stickier tires). I may swap to them on my car because rally-x reasons.

EDIT: I'm wrong on the bias change, the rear FHI 2 pots shift bias forward. Front FHI 4 pots have no effect on bias.

I can't remember but I don't think it clears stock 2013-2016 wheels.

- Andrew

[Ernest72]

I have the 4 pots on my 04 WRX, with H6 rears. Certainly better than stock, but nothing earth shattering. I would stick with stock until you need more and start saving, because it is not cheap to get a good BBK and wheels that fit. And for me I do summer/winter so I need two sets of wheels that fit. Don’t want to do spacers.

[Uncle86]

currently running the 20/25 spacers on the stockers now. Ill be installing my 18" Nt03's soon once I get the suspension all dialed in

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[jamal]

Originally Posted by Racecomp Engineering

It does shift some mechanical brake bias to the rear so it may not be the best choice for everyone (I would not recommend that caliper with stickier tires).

- Andrew

My understanding is that the brz 2-pot has smaller front caliper pistons than the regular wrx/impreza part. Which by my spreadsheet moves the bias forward a touch.

Also with EBD I wonder how much it's really going to matter.

[Racecomp Engineering]

Originally Posted by jamal

My understanding is that the brz 2-pot has smaller front caliper pistons than the regular wrx/impreza part. Which by my spreadsheet moves the bias forward a touch.

Also with EBD I wonder how much it's really going to matter.

Originally Posted by jamal

My understanding is that the brz 2-pot has smaller front caliper pistons than the regular wrx/impreza part. Which by my spreadsheet moves the bias forward a touch.

Also with EBD I wonder how much it's really going to matter.

For pistons I had 42.8 mm for BRZ front and 38.1 rear non-PP USDM calipers...and after all these years it turns out I was wrong. Those numbers still come up most places you look but I think they're wrong now.

So front FHI 4 pot is same rotor and about the same piston area as OEM BRZ (40.4mm), but the rear FHI 2 pot has smaller pistons than OEM BRZ (38.1 vs. 40.46). So a frontward shift with the front and rear FHI set up due to the rear calipers.

Damn it. I'm embarassed. Gonna go back and edit like 50 posts.

Front:
Hitachi CL25VD Caliper with Dual 40.4mm Pistons (1.591 in.) x 2
FA300 Pad Material with 48.3 cm^2 pad area (7.487 in.^2)
294.0 mm x 24.0 mm Ventilated Rotors (11.575 in. x 0.945 in.)

Rear:
Hitachi CLA12V Caliper with Single 40.46mm Piston (1.593 in.)
FN360 Pad Material with 23.0 cm^2 pad area (3.565 in.^2)
290.0 mm x 18.0 mm Ventilated Rotors (11.417 in. x 0.709 in.)

- Andrew

[jamal]

Pretty sure I've made a few comments about brake bias with the assumption front calipers had the bigger pistons.

[Racecomp Engineering]

Yeah the wrong piston sizes are all over the place. Next time I'll measure myself! I think I (like others) assumed they were the off the shelf WRX slider front and I guess LGT rears or whatever based on rotor size.

- Andrew

[gtpvette]

Originally Posted by Racecomp Engineering

For pistons I had 42.8 mm for BRZ front and 38.1 rear non-PP USDM calipers...and after all these years it turns out I was wrong. Those numbers still come up most places you look but I think they're wrong now.


- Andrew

Andrew,,, any chance you post the correct numbers?? These are the numbers (42.8 and 38.1) I see in most post. I recall seeing a post where a guy had a picture of the pistons with the digital caliper on it,, dam if I can find it today.

[86league]

Originally Posted by gtpvette

Andrew,,, any chance you post the correct numbers?? These are the numbers (42.8 and 38.1) I see in most post. I recall seeing a post where a guy had a picture of the pistons with the digital caliper on it,, dam if I can find it today.

I measured a stock 2016 piston as 40.4mm (granted with a cheap HF caliper, but it's been pretty accurate). Didn't measure the rear (only rebuilt the fronts), but the subaru parts catalog shows the rear caliper using the same part # for the piston as the front -- just 1 rear vs 2 front...

https://www.ft86club.com/forums/show...1&postcount=16