Track day report: 5/4/2019 Auto Club Speedway
I wanted to share a track day report with my 2016 C7 Base Stingray A8 from this past weekend, to see if others have thoughts on the track or the line I'm using. Here's a video I made earlier tonight:
I cut 6 seconds off my previous best! I have installed the Z51 rear anti-sway bar to my base car, and have started to take some different lines. My new best time was 1:58, finally sub 2-minutes! A8 Transmission issues After doing some research on the A8, I saw that 2nd gear requires an additional brake to be applied inside the transmission. I was thinking that this additional brake could be causing the transmission to overheat when it's triggered. My A8 typically gets to 275-280F after 20-25 minutes, and I have to come in from my session early. I decided to not use 2nd gear outside of the out-lap on this day. I had NO problems overheating while avoiding 2nd gear! A few corners require ~40mph min speeds, and 2nd gear would provide a bit more torque coming out of the corner, but I really didn't miss it. I did accidentally go into 2nd gear on one corner, and I instantly got the 'shift denied' message afterwards. The temperature traces did not show any real spikes, engine oil temp and pressure look fine, so there's only 1 remaining idea: Maybe 2nd gear requires a lot of oil pressure, and after using 2nd gear the transmission gets upset because the transmission pressure is low? I don't have a transmission pressure sensor reading, so I really have no idea. I think I've found a way to avoid the 'shift denied' message, but the root cause investigation continues. http://www.speedventures.com/images/SV_ACS_Roval.jpg Turn 2 aka Bank turn There's a bank turn, and some guys will run 160mph around it. Previously, I would let my min speed hit about 105, the car felt more planted this time, and I set the min speed to be closer to 112, which is where I think I've made up most of the 6 seconds. There's some serious banking, so if I had nothing to loose, I could probably go around the turn at 125+. Turn 5-6 aka 1st hairpin I didn't realize that you shouldn't be on the inside of turn 5, that you should turn in around the seam in the pavement. Staying to the outside of this turn sets you up great for the next straight before the chicane. Traction Control/Active Handling I have the base car, so no PTM modes for me. It's traction control off, or traction control+active handling off for me. I've tested turning off traction control during an autocross event, and I felt much more connected to the car. Still to worried to turn off the traction control at ACS, but looking at where the traction control+active handling are triggering, I'm not sure it's helping me much. I see it triggering when I'm coasting on the track, or under braking. I think these aids really help me during corner exit, but I don't really see them turning on during corner exit. My next test is to turn off the traction control while leaving active handling on at Chuckwalla - lots of run-off room. |
I was there too, fun day!
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I'll take a look later. I have a couple thousand plus laps on this track at this point.
Right off the bat, never listen to anyone or believe them when you hear things like, "I never lift in the esses" or "I do xxx MPH in Turn ??." They are almost always wrong. I look at the data or video of drivers, some who are quite accomplished and for whom I have great respect, who say "I never lift there", but then video or data shows they are clearly wrong. Or people say "I do 120 MPH in Turn X." What does that really mean? Corner entry? Minimum speed at apex? Turn exit? Do they really know? What is the definition of their speed they are quoting? For the record, I can name on one hand road racing drivers I personally know who exceed 160 on Turns 1 and 2 at ACS and they are in GT1 cars with vastly more tire, less weight and bigger wings than just about any other cars with a fender and roof that can turn both right and left. |
I enjoyed your video. I loved seeing the data from the C7s. I have never seen that before.
BTW - Great driving for your first track day and first time at this track. My comments on your driving and the video, mainly focused on your lines at this time:
Your mileage may vary and other drivers may disagree, but that is my input. Oli |
Just as a point of interest, I was racing at Circuit of the Americas for my second time this weekend in Spec Corvette. Friday was a day called Test and Tune. I took my fast lap from that morning and sent to Dion at Racer360.com for some coaching feedback from him as I had a race on Saturday and two more on Sunday. Here is his feedback cool tool he uses to coach. Actually let me post a the full unedited lap and then his coaching feedback integrated.
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For a perspective from my other Corvette race car running in NASA ST2 trim at Auto Club Speedway for a perspective on my driving lines vs. yours.
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Can't add any more than what Oli did regarding the line and to say that what he outlined is what I also attempt to do.
Regarding Traction Control, you should be able to put it into "Competition Mode" like on the C5 and C6 cars. Not sure how to do that (I have a GS with PTM), but I do recall seeing it in the Owner's Manual. That'll give you a level of comfort with a reasonable amount of freedom from the nannies. I wanted to be out there but alas had to travel for work. Gotta pay the bills! |
@Olitho Thank you so much for providing feedback on my lines! This is extremely helpful! I also like your 1:43 lap. It looks like your spec corvette can do ~145mph in the banking - you've got a lot more downforce than me tho. I do believe I can still carry much more speed through that banking.
I was trying to find a video showing the line through turn 6 that goes past the white line on the outside, and I finally saw it in your flying lap. I didn't find any drivers to follow in the intermediate group to follow who took a line like that. Your lines are roughly drawn on the SpeedVentures track map: http://www.speedventures.com/images/SV_ACS_Roval.jpg but I couldn't really follow every line without an explanation or demo on how to do it. I think the information on what lines to take for a given track in "today's" sports cars with is pretty universal. The lines you're talking through are probably applicable for modern Porshe's, Camaro's, and GT-R's. I also find this information extremely hard to find, there's probably space in the market to provide this info for all tracks in the USA. Cheers, Mike |
I think this is a good reference lap for no aero and low grip tires:
Plenty of folks do worse than 1:58, but: 1) push the car more 2) don't miss so many apexes 3) turn off ah/tc And you should be able to do improve your times. Chuckwalla will demand execution on all of the above much more than ACS. |
Originally Posted by wtb-z
(Post 1599369098)
I think this is a good reference lap for no aero and low grip tires:.
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