01-21-2021, 03:37 PM | #1 |
Lieutenant
420
Rep 518
Posts |
StopTech Trophy Sport/Race setup
Last December I decided to upgrade my stock brakes to a StopTech setup for the new track season. It took me close to a month and a half to finish the process because there were issues with the parts being mixed up, and me wanting to upgrade from Sport to Race setup. In order to simplify the path for people who want to try the same path, I am going to post the part numbers to make it easier to track if packaging error occurred, and I will also post pictures on how to convert from a Sport to Race setup. I also want to thank BuyBrakes for helping me out on journey.
First, the part numbers for the front and rear StopTech Sport kit. The F80 system Front system is a STR60 380x32 Wide annulus system (62mm). 31.836.5101 380X32 SLOT LEFT WA 31.836.5102 380X32 SLOT RIGHT WA 37.B38.U615 HAT 36.B38.8F19 BRACKET 372.C36.11F3 STR60/30-30-36/32 372.C36.11F4 STR60/30-30-36/32 309.12471 ST SPORT BRAKE PADS The Rear System is a 380x32 STR41 Normal annulus system (50mm) . 31.836.A101 380x32 SLOTTED LEFT 31.836.A102 380x32 SLOTTED RIGHT 37.B38.8425 HAT 36.B38.8529 BRACKET 950.34531 SS Brake Line Kit 309.06080 ST SPORT BRAKE PADS 372.F30.11F1 STR41/28-30/32 372.F30.11F2 STR41/28-30/32 I don't have the actual part numbers for the Race kit, but the major difference between Sport and Race are a few small components. First, the race calipers don't have any dust boots. Second, the friction disc mounting hard for the race kit uses flat washers, while the sport uses conical washers. Otherwise, everything else is the same. The race kit doesn't come with anti-knock back springs by default, and they have to be installed separately. Now on to the pics... After talking to BuyBrakes guys, I was told that StopTech recommends the anti-knockback springs only on the front calipers. Also, in order for the springs to work correctly, the dust boots had to come off. So I bought a Makita compressor and the springs and went to work. The pistons have to be removed so that the springs can be installed behind the pistons. It is better to just to upgrade one piston at a time to just use the compressed to push the piston out. I recommend to use a towel to catch the pistons when it gets ejected. Also, don't use more than 50PSI to eject the pistons (it might take some time for it to finally start moving). I initially used 100PSI and the pistons got ejected so fast that they bounced around and got nicked. Once the piston comes out, just remove the dust shield and then attach the spring to the back of the piston. Apply just a bit of Centric caliper assembly lube to the piston and the seal, and slide the piston back in. Then, move to another piston. |
01-21-2021, 03:46 PM | #2 |
Lieutenant
420
Rep 518
Posts |
Next, there is the Sport vs Race rotor conversion. The only difference between Sport and Race are the washers. The Race setup uses a flat washer and allows the friction disc to move freely side to side by 0.4mm. If you drive with the race rotor on the street, it will sound like you have blown shocks and all of your front end bolts are loose. I drove like this for a few days, and then moved back to Sport setup. My thinking was that having anti knock back springs is good enough, and the conical washers do still provide some float.
|
Appreciate
0
|
01-21-2021, 03:53 PM | #3 |
Lieutenant
420
Rep 518
Posts |
And the final assembled look. Overall, the brakes feel much more linear compared to stock, and they look pretty bling
I'll try to get a track report in a month or so. |
01-21-2021, 06:35 PM | #5 |
Lieutenant
420
Rep 518
Posts |
If I knew what I was doing right off the bat, the total cost would have been around $5600 (I am not counting the $200 compressor). I am bit annoyed that the bridges are not that easy to remove. I even had to do a bit of sanding on the rear bridges to make them easier to remove. Otherwise, the pads are fairly easy to change and there is no need to dick around with the pins on the OEM calipers. There are also a lot more pad options compared to the OEM setup, and the pads themselves are larger, which is nice for the track.
Stopping is also better as the feel is very linear compared to the OEM setup. |
Appreciate
0
|
01-21-2021, 08:31 PM | #7 |
Lieutenant
420
Rep 518
Posts |
|
Appreciate
0
|
01-21-2021, 08:36 PM | #9 | |
First Lieutenant
319
Rep 317
Posts |
Quote:
|
|
Appreciate
0
|
01-21-2021, 09:32 PM | #10 | |
Lieutenant
420
Rep 518
Posts |
Quote:
I highly suggest to get the washers for the Sport kit as the race kit will drive you nuts, unless you drive with windows closed and tunes blaring. |
|
Appreciate
0
|
01-21-2021, 09:54 PM | #11 | ||
First Lieutenant
319
Rep 317
Posts |
Quote:
The guys over at buy brakes must be annoyed with us lol. |
||
Appreciate
0
|
01-22-2021, 04:08 PM | #13 |
Captain
591
Rep 987
Posts |
I would've recommended you try the brakes without installing the knockback springs first to see if its actually needed.
I have stoptechs on all 4 corners of my track car and was worried about knockback before installing but it was not an issue after installing. |
Appreciate
0
|
01-22-2021, 06:04 PM | #14 |
Lieutenant
420
Rep 518
Posts |
Its easier to install the springs when the calipers don't have brake fluid I figure that the springs are probably not necessary unless one is hitting the curbs really hard. I installed the springs because the AP racing calipers also come with them.
|
Appreciate
0
|
01-22-2021, 06:13 PM | #15 |
Lieutenant
306
Rep 419
Posts |
nice write up - I ordered the same kit (nickel plated) back in December. Was told the current lead time is about 8 weeks. How long did you wait for your kit to arrive?
|
Appreciate
0
|
01-22-2021, 06:19 PM | #16 |
Lieutenant
420
Rep 518
Posts |
I got the Sport kit in less than a week after putting in the order. If you asked for some race components, then it takes a while.
|
Appreciate
0
|
01-22-2021, 06:27 PM | #17 |
Lieutenant
306
Rep 419
Posts |
|
Appreciate
0
|
01-22-2021, 06:48 PM | #18 |
Lieutenant
420
Rep 518
Posts |
|
Appreciate
0
|
01-22-2021, 09:17 PM | #19 |
First Lieutenant
319
Rep 317
Posts |
I'm guessing we just got stuck at the next production batch. Supply chain is wild these days.
|
Appreciate
1
jim1013yyf306.00 |
02-22-2021, 07:29 PM | #20 | |
Major
884
Rep 1,261
Posts
Drives: 2016 M4 GTS
Join Date: Oct 2008
Location: Cumming, GA
|
Quote:
https://frontstreet.media/2020/10/21...big-brake-kit/
__________________
2016 M4 GTS Alpine White
2021 X5M Competition Marina Bay Blue Instagram: @JustAnothaM4 |
|
Appreciate
0
|
02-22-2021, 07:49 PM | #21 | |
Lieutenant
306
Rep 419
Posts |
Quote:
|
|
Appreciate
0
|
02-22-2021, 08:56 PM | #22 | |
Major
884
Rep 1,261
Posts
Drives: 2016 M4 GTS
Join Date: Oct 2008
Location: Cumming, GA
|
Quote:
Are there part numbers for the new Gen 5 kit?
__________________
2016 M4 GTS Alpine White
2021 X5M Competition Marina Bay Blue Instagram: @JustAnothaM4 |
|
Appreciate
1
dvq319.00 |
Post Reply |
Bookmarks |
|
|