07-14-2020, 06:14 PM | #67 | |
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07-14-2020, 09:26 PM | #69 |
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FormulaMMM3662.50 |
07-15-2020, 10:00 AM | #71 |
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Few laps chasing the monster. Looked killer in whatever silver/grey color this is
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07-15-2020, 12:17 PM | #72 |
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That ZL1 has some power, it just walks away on the straight. Looked like the GTS was making you work for those laps.
If you're using a GoPro Hero5-7, this ND filter set was perfect for properly exposing the tarmac -> https://www.amazon.com/gp/product/B074V76DWB. I'm using a ND8 and I can now see the tarmac in my recordings vs it being an overexposed white glare. |
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07-15-2020, 04:57 PM | #73 | |
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07-15-2020, 05:40 PM | #74 | |
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Highly recommend messing around with the GoPro Protune settings. |
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07-15-2020, 10:23 PM | #75 | |
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Just press on the display until auto exposure comes on and then target the front windshield otherwise it adjusts to the interior lighting depending on camera location. |
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Gomeler500.00 FormulaMMM3662.50 |
07-15-2020, 11:05 PM | #76 | |
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07-16-2020, 07:59 AM | #77 | |
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yes, GTS is definitely high strung, but always communicative and largely predictable. Unless you really (really...) overcook it into the corner, the front end is going to bite, then it's a balancing act with steering & throttle. Prototypical M handling, except turned up a notch in the GTS because of the power/torque and throttle sensitivity. You have to really be on it, I love that. On the front end -- in the chase video from my perspective really chucked it into turn 1 2:46 - 2:54. Probably shouldn't have been able to hit apex there. But front end still dove in, back came around. The front axle in the F8X gen has always been immense and GTS maximizes it. I haven't maxed out camber yet either. But if I can get the rear axle to calm a little bit with damper and psi adjustments, that would be ok... Thanks all for the video tips. I'll try to adjust next time around.
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SYT_Shadow11490.00 Gomeler500.00 |
07-16-2020, 10:21 AM | #78 | |
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01-21-2021, 04:43 PM | #79 |
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As previously mentioned, lower operating temperatures with BBK. Additional benefit, you can remove studs without breaking them - broke 3 on the rear axle and of course, 0 on the front axle. Guess how much fun removing 3 broken studs is......if I keep this car, BBK on rear!
2nd image of rotor wear, this time w/o cracking to perimeter |
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01-21-2021, 05:00 PM | #80 | |
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01-21-2021, 05:42 PM | #81 |
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There was a fair amount of swearing, but in the end, it wasn’t that bad once armed with the proper drill bits
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01-21-2021, 05:43 PM | #82 |
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One additional thing I have noticed, rotating the 25mm pads across the axle and inside to outside dramatically improves pad life
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01-22-2021, 08:33 AM | #83 | |
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Nice insight on the pads. Was recently schooled on pad taper and extending life with intermittent rotation/flips by an indy P shop. Believe tech said sometimes as much as 50% more life if you're consistent with it. I do see developing after a couple of events on RSL1 and stock calipers. The longer the pads, the more taper. AP Racing system and calipers are designed to counteract, pretty cool: The pistons in our AP Racing calipers have differential bores (pistons are different sizes) designed to combat this issue. The piston on the leading edge is smaller to apply less pressure, while the trailing piston is larger to apply more pressure, which helps even out the wear. https://www.essexparts.com/news-blog...d-owners-guide
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01-22-2021, 11:46 AM | #84 |
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I flipped my pads once with my AP setup in 2020. I only ran ~5 days with them, but I noticed some serious taper in.. the rear. I wasn't expecting that. The fronts were okay, the rears would have been comically lopsided if I hadn't flipped them.
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FormulaMMM3662.50 |
01-25-2021, 11:13 AM | #85 |
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What pressures / camber settings are you guys running on the rear?
I was having a lot of trouble with entry/mid-corner oversteer. Front axle grip is excellent but the rears just cannot keep up, and this is off-throttle or maintenance throttle. Part of the issue I'm sure is that I was running street height and damper settings. Difficult to really maximize entry speed when you are worried about the back coming around the entire time. On the exit I'm fine with managing oversteer, but would much rather have a neutral/understeering car at entry. Fronts are 275/35/19 AMG GT R Sport Cup 2s, was running ~35 psi hot. Rears are 305/30/20 458 Speciale Sport Cup 2s, was running ~32 psi hot. The front grip was pretty solid, especially once I got the tire up around 170F. But I was getting entry/midcorner oversteer at only 0.9G, which is terrifying in the faster stuff. |
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01-25-2021, 01:02 PM | #86 | |
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For sure street ride height isn't helping your cause. The most settled I've had an M car was on Clubsports and the rear slammed. Fall Line E9X alignment spec back in the day. Another member has reported rear traction gains below the blocking ring. I may be headed that direction next season. Slackening rear dampers might also help. Intend to try -2 -3 clicks rebound than recommended track spec next time out. I don't know if neutral/understeering on entry and midcorner is in the cards for the GTS. Front axle is absolutely pinned. But there are major lap time gains to be achieved by getting the rear under control. It's an uphill battle, always going to be moving around on you. Reportedly also a weakness of the M4 GT4. You have aero at maximum attack?
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01-25-2021, 01:44 PM | #87 | |
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Lowering to track height would definitely give more rear camber, which can't hurt. It was just frustrating to look at the telemetry and see that I was well below 1.0G in almost every corner and the back end was stepping out or wanted to step out every single time. Tried everything I could think of too - less/no trail braking, little bit of maintenance throttle, no maintenance throttle, different lines, etc. Even the corner workers were commenting that it looked like I was on roller skates, particularly in off camber sections. Just frustrating to be running 305 section Sport Cup 2s and have absolutely no grip or confidence whatsoever. Maybe they weren't getting fully up to temp? Part of the issue likely stems from the fact that my previous track car (CTR) was ridiculously chuckable and planted at the rear. Also the track I was on does not have any functional runoff (little bit of grass and then either a berm or woods), so it is a bit sketchy to get entry oversteer at 85+ mph. |
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01-25-2021, 02:02 PM | #88 | |
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Completely different tire/suspension so I'm not sure how relevant it is but I was running around 32 pounds on A052's and the car didn't have the grip that it did with 38 pounds at all four corners. |
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