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Old 03-02-2009, 02:13 PM   #1
coolblue05
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Default New Stoptech racing series track brake kit...

I figured the Motorsports crowd would be interested in this new brake setup that has been released...

Stoptech has just come out with a new racing "trophy" series brake kit for the sti. Word has it that there is a ST-60 front kit and possibly a ST-40 rear kit for the sti. The kit looks beautiful, I will definitely be looking into pricing... The calipers are extra lightweight, anodized finish, full floating rotors, and no dust seals...

These could be the best track brakes availiable for the sti yet....

An article:
http://images.google.com/imgres?imgu...%3D1%26hl%3Den



Harmon is using the kit on their time attack car...


Another pic of Harman's setup...


They clear what appears to be 18x10.5 NT03's...
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Old 03-02-2009, 02:17 PM   #2
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looks rather solid! Can't wait to see some reviews on them
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Old 03-02-2009, 02:31 PM   #3
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Found out some more info as per stoptech...

Ft- lightweight ST-60 six piston calipers (.5-1.0 lb. lighter than regular ST-60), bigger pistons (compared to regular ST-60) no dust boots, 355x32 two-piece rotors

Rear- lightweight ST-40 four piston calipers, bigger pistons (compared to regular ST040), requires removal of rear parking brake assembly, 328x28 two-piece rotors

MSRP
front- $4165
rear- $3165

Uses stock sti master cylinder!
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Old 03-02-2009, 04:10 PM   #4
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Quote:
Originally Posted by coolblue05 View Post
full floating rotors...
I'd love to see pictures of this feature. Not that I'm in the market for a $8k brake upgrade.
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Old 03-02-2009, 04:49 PM   #5
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Pretty sure the rotors are exactly the same as their other 355mm rotors, except that the hats have the special anodized finish. Basically the reason to buy this kit over the regular 6-piston kit is for the lighter calipers. The rear kit is also a very nice upgrade, but obviously track only since it eliminates the parking brake. I may consider adding the rear kit to my existing 6-pot front kit.
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Old 03-02-2009, 05:41 PM   #6
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Quote:
Originally Posted by 68Cadillac View Post
I'd love to see pictures of this feature. Not that I'm in the market for a $8k brake upgrade.

The difference with the rotors for added float is the use of a flat washer instead of a beveled washer inthe mounting hardware. All of our rotors are fully floating, these just happen to have more float allowing for reduction in pad knockback...the downside is that the rotors clatter a lot and would be very annoying on a daily driven car. Our street kits use a beveled washer that applies pressure to the rotor which keeps it from making noise but limits rotor float slightly. This is not a disadvantage on the racetrack and many race teams use standard off the shelf parts and win major championships. Since these are designed to be full race kits, we decided to allow the maximum float with no regard for street use requirements.
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Old 03-02-2009, 05:48 PM   #7
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Here are some more pics:

ST-60R:





ST-40R:



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Old 03-02-2009, 06:14 PM   #8
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Awesome!

Will the new ST-40R's be available as a lightweight front 355x28 or 355x32 kit for ultimate weight savings? If I was using stock '08 rear Brembos, how much further would the balance shift compared to the current ST-40/355 kit?

Frank
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Old 03-02-2009, 07:12 PM   #9
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Thanks for the pictures Eric!


Quote:
Originally Posted by boost junkie View Post
Pretty sure the rotors are exactly the same as their other 355mm rotors, except that the hats have the special anodized finish. Basically the reason to buy this kit over the regular 6-piston kit is for the lighter calipers. The rear kit is also a very nice upgrade, but obviously track only since it eliminates the parking brake. I may consider adding the rear kit to my existing 6-pot front kit.

I am also using the regular ST-60 front, stoptech advised against the regular ST-60 front with the ST-40R rear. It could probably be used, but it would not be optimal. You could always sell the ST-60 front and go with the ST-60R for not too much more. From what I have seen, the ST-60R and ST-40R are designed to work together.
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Old 03-02-2009, 07:27 PM   #10
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If you got a kit for the front only of your 08, there would be no balance shift to worry about. The 4 wheel race kit for the 04-07 STi has increased front and rear brake torque since the overall torque output for the ST40 rear could not be brought down low enough to work properly with standard front piston sizes. This is not an issue on the 08+ STis.
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Old 03-02-2009, 08:48 PM   #11
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im a brake noob, what is the advantage of having no dust seals?
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Old 03-02-2009, 08:52 PM   #12
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whoa.. $$$
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Old 03-02-2009, 08:59 PM   #13
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Quote:
Originally Posted by pio!pio! View Post
im a brake noob, what is the advantage of having no dust seals?

There isnt one really, For a track or weekend car that sees little dust/gravel/rain/anything that could work its way in to the space between the piston and caliper, they are fine. Plus being a motorsport caliper it would probably be cleaned and inspected more than your average person would want to do on their daily car.

Dust seals do what they say they do, keep dust and debris out of contact with the piston and caliper spaces. Which could cause the piston to seize etc, if they are not being taken good care of.

Edit to say: Plus on a race car that sees such high temps dust seals wouldnt really last that long, the rubber would get brittle etc.
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Old 06-09-2009, 03:55 PM   #14
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Bringing this thread back..

So, ESmooth.. Since you say the balance shift wouldn't matter for an 08+ car, should an 08+ just go with the front kit? Is the rear worth it for an 08?

I guess I don't know the differences in the braking system between an 08 and 05-07..

I'm trying to decide which setup to run on my race car, without breaking the bank.
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Old 06-28-2009, 11:04 AM   #15
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I don't understand ESmooth's answer either. If he was trying to say they increased the ST-60R's piston sizes to allow the use of an ST-40 caliper in the rear, then why did they also increase the piston sizes on the ST-40R?? Are larger pistons all-around better for brake modulation or cooling? If so, I'd like a set even more. If he was referring to using the ST-60R caliper with stock rear Brembo's, there would be a bigger bias shift than using any other caliper combination, so I would think this would be getting into problem areas. To rank the bias's (my estimate only!!):

From maximum front to maximum rear:
ST-60R front, OEM rear (bad?)
ST-60 front, OEM rear
ST-40R front, OEM rear (or does this go one line up??)
ST-40 front, OEM rear
OEM front, OEM rear
OEM front, ST-40 rear (bad)
OEM front, ST-40R rear (bad!)

As previously commented elsewhere, I understand that the stock sti setup is a bit too rear-biased and happily accepts additional front torque with the stock Brembo rears. Numerous people are using regular ST-40 and ST-60 355mm fronts with stock Brembo rears. The question I'd really like answered is whether the ST-40R caliper would be ok on the front in place of the regular ST-40 or ST-60. I guess I just need to check the total piston area and compare it to the ST-60, which we already know works. So, the hard combinations to rank are:

ST-60R front, ST-40R rear (the set in OP)
ST-60 front, ST-40 rear (standard street setup)
ST-60R front, ST-40 rear (not recommended per ESmooth?)
ST-60 front, ST-40R rear (edit- not recommended per stoptech)

Frank

Last edited by Frank A; 06-28-2009 at 11:50 AM.
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Old 06-28-2009, 11:16 AM   #16
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ps- just searched the stoptech website and could not find caliper dimension data, much less any mention of these sets. Maybe another site?
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Old 06-28-2009, 05:16 PM   #17
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Quote:
Originally Posted by Frank A View Post
ps- just searched the stoptech website and could not find caliper dimension data, much less any mention of these sets. Maybe another site?
I found out some more info from Stoptech on these calipers for the 08+ models... The reason ESmooth said it doesn't matter is due to the fact that they do not change the piston sizes for the 60R caliper compared to the regular 60 - for the 08 only. So really, if you don't care about a few extra pounds, just stick with the regular setup on the newer cars.

They wouldn't tell me the piston sizes for the 08+ calipers, however. They seem to be secretive about it.
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Old 06-28-2009, 05:50 PM   #18
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If I had those I wouldn't want to put them on my car... I'd want to display them in my living room.
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Old 06-29-2009, 05:55 PM   #19
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Piston sizes are application dependent. When we say ST40 or ST60 its referring to the caliper family, not the piston sizes within it which will change drastically depending on what car the kit is designed for.

In the case of the 04-07 STi kit, the use of the 4 piston rear calipers means we have to go up in front piston sizes to keep the balance correct. This is because we cant build an ST40 with piston sizes small enough to match stock brake torque.

In the case of the 08+ STi, we use a 2 piston rear caliper which does have a low enough torque output to use the same front kit with stock rear brakes or our big brake kit. We have not developed a race only rear kit for the 08 STi yet but it would likely also go to a 4 piston rear for added pad volume and would therefore reuqire a front piston size increase to maintain proper balance.

Make sense?
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Old 06-29-2009, 06:01 PM   #20
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Another note, we only offer the 04-07STi rear kit as a race only version that requires parking brake removal so you really cant compare it to something that has a normal rear kit like the WRXs and 08+ STi
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Old 06-30-2009, 09:06 AM   #21
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Can you tell us the piston sizes for the calipers? Some of us race-oriented guys would like to know before making the purchase.
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Old 06-30-2009, 12:42 PM   #22
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We dont release piston sizes as they are based on testing. Our application specific piston sizes is what sets us apart in the industry and is not something we would like to share with our competitors.

If you have a need for customized piston sizes for dual master cylinder applications or are concerned about the torque outputs related to stock, give us a call and we can discuss that with you.

For cars with stock master cylinders, there is very rarely ever a need to run anything other than what we have determined as being ideal. Any kind of fine tuning for your specific needs can be met with proper brake pad selection. This has been proven with our many race and championship wins over the last decade with off the shelf kits on cars ranging from mostly stock to very heavily modified with regards to tires, suspension, aero, weight and power.
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Old 09-18-2009, 04:21 PM   #23
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To update this thread, I have a full set on order. I will be sure to post many pictures and a review when I get them on.
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Old 09-18-2009, 10:28 PM   #24
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Quote:
Originally Posted by coolblue05 View Post
To update this thread, I have a full set on order. I will be sure to post many pictures and a review when I get them on.
interested to know, im close to ordering a set. i know jc's(harmon motive) been running them for a little while now and said he loved them.
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Old 10-28-2009, 11:38 AM   #25
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My set came in recently. The whole kit really looks very well made. The calipers look like a work of art, plus they are very light. I can't wait to get the kit on and test it out. More reports to come...

Quick picture I took:
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