RR Racing Brake Development -- Competition and Street

[ryoma]

Originally Posted by maregt

I'm interested in this too.
I'm evaluating the sport performance rear with a stage 2 front, but i remember a graph showing a big shift in brake bias towards the rear, so I'm a bit worried cause I'm on stock strut and weight transfer to the front while braking on track is significant.

The comparison was made using the base model rear disc (277mm solid) as a reference, I have the 290mm vented, so I think my situation is not that bad, however i'd appreciate a lot if someone can confirm that the car is safely drivable on track with stock strut (stock spring and everything) and stock size tire (r-compound)

Thank you very much

Originally Posted by Joe-G

I recall coming across it somewhere, but cant seem to find it now....

Can someone confirm bias numbers for the sport kit, and stage 2, with OEM rear calipers?

One is better than the other IIRC?

@sickmint79 has an article about brake bias on his website: http://sickmint79.kinja.com/ats-and-...390.1472560687

the RR kit is a little further down, but the whole article is a good read.

[maregt]

Originally Posted by ryoma

@sickmint79 has an article about brake bias on his website: http://sickmint79.kinja.com/ats-and-...390.1472560687

the RR kit is a little further down, but the whole article is a good read.

Thank you, took my time to read everything and it was indeed a good read, unfortunately there wasn't actual driving impressions with wilwood's rear kit so i cant' really say i made up my mind.

@cruizin01 , @ajc209 , i've read you have sport performance rear and you track your car: do you think the rear is worth the upgrade on stock strut? Any "problem" trailbraking? Do you use same pad front and rear?

Thank you

[cruizin01]

Originally Posted by maregt

Thank you, took my time to read everything and it was indeed a good read, unfortunately there wasn't actual driving impressions with wilwood's rear kit so i cant' really say i made up my mind.

@cruizin01 , @ajc209 , i've read you have sport performance rear and you track your car: do you think the rear is worth the upgrade on stock strut? Any "problem" trailbraking? Do you use same pad front and rear?

Thank you

I cant really comment as I was having brake pads issues which led me to believe i needed a rear kit. I hope to have all that resolved.

Sent from my SM-G930V using Tapatalk

[sickmint79]

Originally Posted by ryoma

@sickmint79 has an article about brake bias on his website: http://sickmint79.kinja.com/ats-and-...390.1472560687

the RR kit is a little further down, but the whole article is a good read.

thnx! ended up making my own site and have a more recent article on this too -
https://www.pointmeby.com/2016/09/24...z-frs-gt86-86/

[Joe-G]

Originally Posted by sickmint79

thnx! ended up making my own site and have a more recent article on this too -
https://www.pointmeby.com/2016/09/24...z-frs-gt86-86/

I've come across 3 different sources of information, and all 3 have arrived at different results... -__-

1. One source claims that the sport kit moves the bias forward, significantly less than Stage 1-4.

2. Another source says that stage 1-4 is less than the sport kit.

3. Third source states that bias is the same for the sport kit and stage 1-4.

Im so confused lol...

(this is for aftermarket front, and OE rears)

[frslee]

Just wanted to throw this out there.

Front sport performance kit Wilwood caliper needed 13mm spacer to fit stock wheels. Luckily I have extended stud, so it wasn't an issue.

[maregt]

Originally Posted by frslee

Just wanted to throw this out there.

Front sport performance kit Wilwood caliper needed 13mm spacer to fit stock wheels. Luckily I have extended stud, so it wasn't an issue.

Thank you, how many mm between caliper and wheel?

[frslee]

Originally Posted by maregt

Thank you, how many mm between caliper and wheel?

After 10mm + 3mm spacers, it cleared by 2-3mm. So it was very close.

[Hold_Fast]

Does anyone know how much the Coleman rotor rings run? Just thinking about future replacements.

[gskv]

This thread is 40 pages long and I still don't have any information regarding brake bias information from RR vs. the Essex kit

I want to pull the trigger but this isn't quite feel right...

[frslee]

Originally Posted by gskv

This thread is 40 pages long and I still don't have any information regarding brake bias information from RR vs. the Essex kit

I want to pull the trigger but this isn't quite feel right...

Are you building a racecar?

[ein86]

Originally Posted by gskv

This thread is 40 pages long and I still don't have any information regarding brake bias information from RR vs. the Essex kit

I want to pull the trigger but this isn't quite feel right...

https://www.pointmeby.com/2016/09/24...z-frs-gt86-86/

...couple of graphs in there.

[Joe-G]

Originally Posted by ein86

https://www.pointmeby.com/2016/09/24...z-frs-gt86-86/

...couple of graphs in there.

Yea... but the answers are all different.

The price of this kit is attractive but that's about it, and the potential is definitely there. But it would be nice for actual data provided by the manufacturer... but it seems like they can't be bothered.

Might as well save up for an AP Racing, or Brembo Setup through CSG or Essex. At least they are willing to provide support, and technical info for their products...

[Lynxis]

Originally Posted by Joe-G

Yea... but the answers are all different.

The price of this kit is attractive but that's about it, and the potential is definitely there. But it would be nice for actual data provided by the manufacturer... but it seems like they can't be bothered.

Might as well save up for an AP Racing, or Brembo Setup through CSG or Essex. At least they are willing to provide support, and technical info for their products...

RR-Racing has more or less abandoned this thread now that the products are out. To be fair, this is a development thread and now development is over so there is that but considering the competition is still somewhat active on the forums, well after releasing their products, maybe that is something to keep in mind.

When someone ran the numbers based on my preliminary measurements for the sport performance kit, they found it was extremely close to stock, less than 2% difference in brake torque. Obviously, that shouldn't affect anything for anyone but this was eyeballed with a crappy ruler and could be inaccurate so I had hoped to take more accurate measurements before the snow flew but I never got time so now I'm waiting until spring.

The numbers I got don't match any the published numbers for these calipers from Wilwood so someone (A member of the competition mind you) ran the numbers based on the closest options provided by Wilwood and all of the options are within about 5% of stock. This represents a worst case scenario for these braking systems and IMO, is still fine for the average driver and light track use but I admit a more demanding driver might find this insufficient.