Thunderhill East Bypass Guide/Analysis in a GR86
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- Опубліковано 17 вер 2024
- 9/1/23. Stock class GR86. Did a 2:10.1. Potential was 2:08.x
#thunderhill #east #bypass #gr86 #stock #86dc #86drivechallenge #speedsf #gtradial #commentary #analysis #guide #beginners #hpde
ua-cam.com/video/eT8kz0FgTA0/v-deo.htmlsi=KaJdR4qOrAZ6CZaJ
Full lap with no commentary
Some really good insights here. I’m in a similar boat as you in terms of pace and experience. Honestly rotation is something that still confuses me. Lately I’ve been driving with stability full on and seeing how close I can get without trying anything fancy and just keeping the car totally hooked up. What I found is that I actually got slightly better corner exits like this. I think rotation is a pretty advanced driving technique and using it well is a lot harder than one might think.
A good example: I used to have a GTI (fwd) and in that car I consistently got better corner exits out of hairpins despite it being incapable of rotating like I do in the Brz. In theory it should be the other way around.
Do you have any thoughts about when it’s good to aim for rotation vs keep the rear hooked up?
Have you watched 900BRZ's 5 mile guest lap by Joe McGuigan? He's the deity of thunderhill and has tons of experience with the 86. He slides a lot. Especially on entry. I think with a low grip setup, you kind of have to be violent on entry. But yes, you definitely don't want to be sliding once it's time to exit.
You can also look up NoStreetRacing86. He was there the same day and did a 2:08.3. He also tends to slide a decent amount but maybe not as much as I do.
Also regarding fwd and exits, I think fwd generally is better at exiting from tight, low speed corners because the front wheels are pointing in the direction you want to go. Without rear steer or torque vectoring or other tricks, an rwd car is almost always going to struggle to put down power in really tight exits. That's usually why we try to "v out" tight turns, so we spend less time turning and more time accelerating.
@@404nobrakes The v-shaped line is a great point. More v-shaped means you unwind more quickly on exit and roll on throttle faster too. Never thought of it like that.
Yeah with fwd there’s definitely something from the fronts pointing where you want to go on exit. The downside is the acceleration lifts weight off the driven wheels. Lots of counteracting effects, it’s complex stuff.
@@bpt582 well if the turn is tight enough, the weight transfer is not directly rearward, so the transfer effect isn't as bad as it would be in a straight line. Plus, it helps that fwd cars are usually ~60% front anyway. The GR is probably around 44-45% rear with everything removed from the trunk
@@404nobrakes yup. But weight distribution is also complicated. More weight in front to push the tires down but also more inertia for the front end to deal with hurts when the front is turning more than the rear in a tight corner. Friction coefficient isn’t constant with pressure, so it might even be slightly worse
Interesting commentary. Rotation is yaw/oversteer/beginning of a spin, so you may be overusing the term (or I'm just being overly sensitive). Regarding T8, you might be overthinking it a bit. People brake because some cars simply just have to scrub more speed.
Thanks! And yeah that's how I'm using the word rotation as well. Do you have a timestamp for when I used it inaccurately? And regarding T8, I'm comparing it to other guys driving GR86s like me. Most of the fast guys actually start coasting early instead of braking, but that's hard for me
@@404nobrakes Gah you made me listen to your commentary again (nbd lol). 11:55 you said "rotate the car on the brakes you end up getting oversteer". Rotating the car is literally inducing some oversteer, so it just sounded funny to me. As for coasting early vs braking on T8: what this tells me is that the car is hitting speeds where it's in a weird spot in terms of speed. Think of this scenario: you reach 100 going into the corner and you know you can take it at 95. If you do the lightest tap possible on the brake, you end up overslowing the car down to let's say 93. I can think of a couple solutions here. One is to brake later and hit higher vmax. That is kinda sketchy on 8 because the uphill compression can result in your rear tires kicking out if you're late on the throttle to stabilize the rear. An easier solution is to coast early.
@@chrispy28thanks! Appreciate the second look. What I meant was that the rear started sliding excessively, to the point where I was losing it. I usually use "rotation" to mean good and "oversteer" to mean bad lol.
And yes, coasting early seems to be the most common approach in this car. If I were a genius level driver, I'd probably be able to get the best of both worlds, but I can't even pull off the coasting approach consistently. You have to let off soooo early and precisely
@@404nobrakes T8 takes some time to build confidence/comfort since it's a very fast corner. My only advice on this other than more seat time is to perfect your vision. At turn-in, I already know if I'm hitting the apex right, and I'm already looking at track-out, and right before the apex, I already know if I can be aggressive on the throttle or not depending on how the car is pointed and what the tires are telling me. This all happens in like a second so it takes practice.