When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So lots of revelations today, and a great day at Mid O.
Best to worst list:
1) New Personal Best at Mid Ohio: 1:43.75 -- shaved 3 seconds from last week with just a few line tweaks. This is huge. Was hoping for 1:45, got 2 seconds better. This never happens!
2) Over heat issues still persist. Cootant temps were 238-240.
3) What I thought was brake fluid leaking past the caliper seal in the rear is diff fluid leaking past the shaft seal. Not as bad, but a different problem all together.
Also, I woke up at 4AM, drove a total of 6h to and from the track, an d had over 2h of track time today. Means I was tired. And by the last session the track was hot, the tires were greasy, and my brain stopped working. I forgot to brake for the Key Hole at Mid Ohio. And that meant I went playing in the sand. After that I Black Flagged myself. I thought you guys might enjoy that.
. . . What I thought was brake fluid leaking past the caliper seal in the rear is diff fluid leaking past the shaft seal. Not as bad, but a different problem all together.
. . .
thanks for the videos, keep 'em coming!
about the axle seal: I had that problem a while back, and had the same difficulty sorting it out from the brake caliper seal. I think the problem was at least partly caused by pressure build-up in the axle because the vent was clogged. I think you might have already addressed that, don't remember because I have CRS. I addressed it with finned diff cover and the "turkey baster" vent installed up on top. Also had to replace the seals, i had a shop do it, and did the seals on both sides and the bearings while we were at it.
Hey John, you are spot on. That's exactly what my problem was too, clogged vent on top of the pumpkin. So now I topped off the fluid and cleaned off the vent.
Really nice facility. The grounds are groomed like a golf course. The track has a really smooth surface and is pretty easy on tires. I developed a pretty nasty brake shake on the first day, so I never really settled into a good rhythm. Not sure yet if I warped my front rotors or if the Glock pads are not bedded properly. It is kind of strange, under light or extremely hard braking it was okay, but anywhere in the middle it shook the steering wheel pretty good. I didn't have any trouble at CMP in May and didn't change the pads out since I wasn't driving it much. I only put a couple hundred highway miles on the car since other than driving to and from the track. I was told that I may have an uneven transfer layer between the pads and the rotors that are causing them to grab erratically. I am going to try and pull the wheels tomorrow and measure the runout on the rotors. Either way, I will go back to my street rotors and pads on the front since I am not scheduled for another track weekend until October. I will get videos posted as soon as I can. I have been having trouble with the GoPro software lately, but I think I finally have it working after uninstalling/reinstalling and a bunch of password changes.
That's not bad at all. You didn't even drop 2 wheels off! Don't worry about it, it's hard to know where the limit is if you never go over it. Outside of the little over-steer over correction (or too long of a pause in Correct-Pause-Recover) your line was looking pretty nice. Your real estate utilization was better than in previous videos, so you're definitely improving
As for brake shake it's perfectly normal with XP10s at medium brake applies. It is caused by uneven transfer of material to the rotor, which is a sign of overheating the pads. I had it happen a few times also. Best strategy with XP10s (or 12s) is to brake late but hard, and avoid semi-hard or light braking. You want to be deliberate yet fast and smooth on the apply. Avoid riding the pedal half way for a few seconds.
I did not observe this problem with XP12, but in all fairness a set of XP12s lasted 3 track days. They evaporated quickly compared to XP10s. No shaking tho. The shaking will go away if you keep the pads in for another week or so. They will scrub the rotors even again.
Yeah, I managed to keep all four on the pavement. I thought I saved it until the front bit and the back didn't causing me to spin the other direction. It happened so fast I didn't have the clutch in resulting in the stall as I went backwards. Now for the brake shake. When you say keep them in for a week or so do you mean for the track or drive them on the street?
Keep the track pads in and drive it on the street for about a week. 100 to 150 miles should be enough for them to scrub themselves even. Then the vibrations will go away
Here is a link to a couple of decent laps from my weekend at Barber. These are from the second day after I was starting to learn the track. I was lined up first and didn't see anyone, until I started to lap some of the slower cars.
Glad to see this thread is still alive! Figured a few folks here would like to see the new toy I picked up a few weeks back.. it’s 2002 Z05 with 19k miles, mostly stock at the moment. It goes under the knife this winter for Track readiness!!
Glad to see this thread is still alive! Figured a few folks here would like to see the new toy I picked up a few weeks back.. it’s 2002 Z05 with 19k miles, mostly stock at the moment. It goes under the knife this winter for Track readiness!!
6/13/18, 09:07 PM
