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Old 09-13-2019, 05:02 PM   #71
DarkSunrise
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Originally Posted by biggie View Post
Short review of the new setup (Stoptech slotted rotors, Carbotech XP10 pads - front only - Stoptech brake lines all around and same Castrol SRF).

During the pad's bed-in period the squealing was unbearable. This process took quite a long time, up to 600 miles of mixed driving (20% city, the rest up in the mountains).
Now, after more than 1k miles it seems to be a bit less noisy and I hope that's the case because they are bedded in properly and not because the outside temps have dropped in the last 2 weeks.
Up the mountains they behave great, lot's more feedback, no issues whatsoever.

On the track however there's an obvious tendency on straight hard braking for the back to slide around quite a lot. This was not the case before and my guess is because of the different pads in the back (yellowstuff). Also, the difference in feedback is not obvious on hard braking (and this is the case on most corners). Maybe there should not be any difference or I'm still to new in this and unable to see it, or maybe I did not pushed them hard enough for the difference to became obvious. Lap times are on par with those from my last trackday so I'm a bit disappointed. Ar least I'm more confident in my brakes.

I'll keep the pads for now, but I think I'll try something different next time (mostly because of the noise). Next on my list were Club Racer and DTC-60, does anyone know how these compare (noise wise) with XP10?

P.S. worth mentioning is that this time I did some cooling laps every 5 minutes or so
When I had xp10's, I only remember getting squeal when the transfer layer had worn off. Try re-bedding them. What I did was 60-5 mph x 10, threshold braking, no ABS. Helps to be on your track tires. Can usually smell the brake pads a bit afterwards.

As strat mentioned, the cause of the instability is probably the difference in pad friction coefficient between the xp10's and ebc yellows. Try matching pads front to rear.
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Old 09-13-2019, 05:13 PM   #72
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You can do it on rural roads if careful.

100-10kmph 10 times over like stated in the post above. I do it all the time prior to track. Do it at your own risk. The layer wears off on the way home...

I would never attempt it on track unless is was closed lol
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Old 09-14-2019, 12:56 PM   #73
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The only thing I did to bed-in the pads was to avoid hard braking (with ABS) during the first 200km of city driving. It seems I keep doing stupid things

After that I left for the mountains and I really pushed them hard the whole trip. Then I hit the track and the rest you know.

I have a 80km drive to the nearest track with about 40km of highway in the middle. I'm going to try re-bedding them on the highway on my way to the track next saturday.

Meanwhile, here are some pictures of the rotors, looks good to me and the surface feels very smooth and plain.
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Old 09-21-2019, 11:22 PM   #74
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Originally Posted by CSG Mike View Post
The quick 86CUP stock class guys beat the Spec Miata lap records, as a reference point.

In my division, SM times are competitive with T4, so that really didnt sound right to me.
So I looked it up:

Sonoma
SM: 1:54.9
86cup stock: 2:00.8

Laguna Seca
SM: 1:45.5
86cup stock: 1:48.6

Willow Springs
SM: 1:36.1 (2016)
86 cup stock: 138.6


Not that those results are anything to be ashamed of for a car on street tires, SMs are actually very fast.
It takes 86cup modified class to beat SM records at Laguna and Sonoma.
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Old 09-22-2019, 02:24 AM   #75
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Hard to beat a Miata on Hoosiers with street tires and an extra 500 lbs, SM records should drop next year as they start using the Penskes, 86cup will drop too as people get more experience building to the ruleset, not a great comparo since fast tires get punished so hard, stick R7s on an 86cup Stock class car and I would bet on the 86.
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Old 09-23-2019, 09:46 PM   #76
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Quote:
Originally Posted by Evan55 View Post
In my division, SM times are competitive with T4, so that really didnt sound right to me.
So I looked it up:

Sonoma
SM: 1:54.9
86cup stock: 2:00.8

Laguna Seca
SM: 1:45.5
86cup stock: 1:48.6

Willow Springs
SM: 1:36.1 (2016)
86 cup stock: 138.6


Not that those results are anything to be ashamed of for a car on street tires, SMs are actually very fast.
It takes 86cup modified class to beat SM records at Laguna and Sonoma.
"stock class" doesn't run "Street tires" in the sense of 200TW tires. 200TW tires are banned in 86CUP stock class. These are 220TW tires, e.g. OEM tires, or SX2!

That being said, if we have the fast guys run stock class cars for times, I can 100% assure you the SM times would be beat. These "fast guys" would be T25 winners, pros, etc. They simply choose not to be big fish in small pond, at what is essentially a friendly competition.
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