05-11-2018, 10:13 AM | #45 |
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I went with the 4009W. The wide makes it great for driving around town since there is enough space to be comfortable. I think the standard would probably be better for track use but I couldn't really move around.
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05-14-2018, 09:04 AM | #46 |
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Status Update:
Went out to MSR Cresson for the SCCA TT this last Saturday on the 1.7 mile CCW track. I wound up placing 2nd in the Street Touring 2 class and I believe I was about 0.3 seconds off of the winner. Brakes did not hold up at all. The brakes went soft and lost stopping power. We bled the brakes but that didn't seem to help. He then did a full flush which did help a little but the brakes still felt spongy. After the last session, I check on the pads and they crumbled! Keep in mind these are supposed to be high temperature endurance pads that operate up to 2000*F. The seats were great and definitely did their job. The combination of seats, harnesses, and HANs took some getting used to. The HANs made it pretty tough to turn my head on some sharp turns. I am not totally used to it yet so lots more seat time is needed to make the adjustment.
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05-14-2018, 09:36 AM | #48 |
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It was coming into rattlesnake when the brakes gave! The best I could do for the day was a 1:26.01 (as recorded by my laptimer). The official results aren't posted yet so it could be off by a little.
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05-14-2018, 10:20 AM | #49 | |
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Per the entry list, looks Armstrong was your only real competition in your class. He's a good driver and a really nice guy. He and I used to battle it out when I used to autox/track more. With the mods on your car (and considering it's a STU build), you should get faster with a bit more seat time. BTW, car looks good! Not sure if you've seen or know about Lightspeed Images, but he attends a lot of events and posts pictures: https://www.lightspeedimages.com/Tex...rials-5-12-18/ |
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05-14-2018, 10:46 AM | #50 |
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Looks like your pads were letting the rotors' heat get into your fluid, resulting in the spongy pedal. The brake duct kit you're going to install may make a noticeable difference in how long your pads hold up.
All pads give up sooner or later, each one in its own way. Hawk's HT10s, for example, begin to break up at 1/2 thickness and should be replaced at that time. At 18mm, the OEM pads' thickness isn't very great, which doesn't help. Too bad the AP kit isn't out yet - one of those along with a brake duct kit would erase brakes from your list of things to be concerned about. |
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05-14-2018, 10:48 AM | #51 | |
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You are right about the need for more seat time, I think I can break 1:25 in the near term on this set up... And good weather . There is one project coming up that isn't a need but is going to be a lot of fun. I have decided to do the m235iR widebody kit and we have it on order.
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05-14-2018, 11:06 AM | #52 | |
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Just curious, do you have a M2 or on the way? Your info says "week 33 MY18 M2" so just wondering. |
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05-14-2018, 11:13 AM | #53 | |
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The guys at TTW aren't huge believers in BBKs but I am going to have them consider the Stoptech Trophy Rs up front. I think that with the cooling should definitely close the book on brakes, aside from the foot controlling them. Oops, I had one on order last year and decided to go in a different direction. Totally forgot to change it.
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05-14-2018, 10:11 PM | #54 |
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Drives: 2014 M235i, Alpine White
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Those pads look terrifying!
Cool track build, would love to do something similar with my 2 series in the future. |
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05-15-2018, 09:08 PM | #55 |
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05-16-2018, 08:44 AM | #56 |
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What pads are you running? What types of events/skill level are you? It sounds like you've done some trial and error, maybe you can steer me in the right direction. I had the Carbotech XP12 up front and blew through them quickly. The most recent set was the Carbotech XP24 which is supposed to be their high temp endurance pads. We are using Motul 600 and have had to flush twice in 3 weekends.
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05-16-2018, 09:24 AM | #57 |
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I'll chime in here too, as I'm more concerned about your 'expectations' then your pads, which imho (based only off photos) crumbled because they were way passed worn out... there is no really simple equation that you should get X number of hours out of a pad. how long your pads will last depend on many factors, track, setup, weight, how you drive, etc. And given your setup, tracks and noted time around msrc you are on the aggressive side of all those. Just as an example I've seen miata's, which can weigh over 1000lbs less and have over 200 less hp, blow through endurance pads in as little as 9 hours but also last over 24... why? it just depends on all the factors listed above. Lessoned learned, check, check, check, fluids, tires, brakes, etc. Last thing you want is your brakes to not function to expectation when 3 cars unexpectedly check up in front of you when you are doing 100+.
Otherwise cool build... don't let this discourage you but use it as a lesson learned and have fun! and most importantly take comments, like mine, from internet forums with a small grain of salt. No matter what I tell you, you really have no idea what my experience is or if what I'm saying holds value :-). |
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05-17-2018, 05:06 PM | #61 |
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Good question. It's not a secret, but it was a very long message that would have taken the OP's post off-topic.
The short answer is that I ran Hawk DTC-60s in my last track car, and that pads are very much a personal thing. Ask ten fast drivers (not necessarily in fast cars, mind you, but drivers who are getting the most out of their setups), and you may well find them running ten different pads. Different drivers have different preferences for initial bite and modulation and release characteristics. The last thing I would suggest is "Go get some DTC-60s because they worked very well for me." Now don't be that way! |
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05-17-2018, 08:49 PM | #62 | |
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I am going to go back out this weekend to test out some carbotech xp20 and PFC 11. |
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05-18-2018, 05:23 PM | #64 |
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06-13-2018, 12:06 PM | #65 |
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UPDATE:
We went to Hallett for the NASA event this last weekend. The car did pretty well. There were of couple of complaints: 1. I bought a new helmet - Stilo ST5 with built in communications. This muffled the sound of the car to the point where I was mis-shifting because I couldn't hear the car. I will need to explore the muffler delete option. 2. During my lesson with a pro coach, he pointed out that the Ohlins didn't have enough damping for the spring rates on the car. (We increased from spring rate to 550lb) This causes the car to hop on hard turns. When the dampers get warm, the problem is exacerbated. Friday's test and tune was when I set my best time - temperature was in the low 80s. On Saturday and Sunday, it got up to 96* outside and the damping caused me to lose as much as 1 second on my time. I originally thought it was the tires overheating but after reviewing the data, there was a turn where the hopping was unsettling the car so much that it cost me 8mph on the exit. 3. Brake calipers were rebuilt (pistons and seals had to be replaced - the pistons were completely warped) but towards the end of Sunday, the pedal got soft on me again. I chose to sit out the last two sessions. So, what's next? Stoptech ST brakes will be installed this week. Next week will be starting the process to have the m235iR widebody, wing, brake ducts, 18x10" wheels, and anti-rollbar installed. We are exploring options on the shocks - MCS or JRZ. The Ohlins make a great street and occasional track suspension but I am asking too much of them. What this means is that I will have two sets of wheels, Ohlins, and brand new PFC 11 front pads up for sale soon.
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06-13-2018, 12:43 PM | #66 |
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I've run JRZ 2-ways and Moton 3-ways (the people at MCS were formerly with Moton). Either will solve your problem while being a much better shock.
Have you been able to install brake ducts yet? I know you don't have time to wait around, but Essex Parts says they may have a kit in their Radi-CAL line in the next couple of months. I offered them the car I'm picking up next week to use for measuring - no response yet, but I'll be following up with them. |
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