daveo4porsche

new personal best at laguna - 2018 911 991.2 GT3 Michelin PS2 Cups - track alignment - girodisc steel rotors - otherwise stock - 1:38.63 - lap data suggests a 1:37.xx possible if i can put it alltogether - I’ll keep chipping away at it. 103 db sound limit so OEM muffler.

i know @orthojoe has a 1:34.xx posted for the manual version - i’m not sure i can get there - my new goal is 1:36.xx next time

orthojoe

Congrats on the new PB, @daveo4porsche . I'll give you my 2 cents on where you can pick up enough time to meet your next goal

1) Flat through T1. Be confident. DO NOT lift. Foot down through the floor and hold on and believe that the car will hold, just don't lift. It WILL hold if you don't lift. The next move is from full throttle to hard on the brakes on the other side of the crest as soon as the car lands and compresses
2) Use more of the exit of T2. If you still have more room at the exit, it means you can unwind and add power sooner
3) T6 you can use more of the exit and drive onto the green in order to carry more speed through the corner. Goal is to have an apex speed at/above 80mph and aggressively on the throttle as soon as you turn in
4) You can exit the corkscrew faster if you stay on the right before turn in for the corkscrew. I learned this the hard way during a SM race I was getting killed exiting the corkscrew when I entered like you are
5) use the green pavement at the exit of T11. Very important. Long straight which means lots of time gained if you exit faster.

daveo4porsche

yeah - I know where the time is and thanks Joe!! you're lap is awesome! Later in the day I was 100% flat through T1 hitting top speed of 136 131 mph - so I'm chipping away at it… it's super fun!

RDCR

At 136 I'd say you chipped away most of it already!

daveo4porsche

@orthojoe thank you for your tips - they are deeply appreciated…
@RDCR the 136 mph was a "top speed" metric the rest of the lap was crap - it was late in the day and the track was greasy, but I did do a 100% full flat run from Turn 11 to Turn 2 - no lift - went a little deep (but not tooo bad) into 2 given the higher speed the braking zone adjustments due to the higher speed...

data shows a 1:37.2x based on segment data - so next time I'm at laguna we're going to working on it!!

thank you both for taking time to respond - this hobby is super fun!

RDCR

I think the best a .1 GT3 will hit there is 133-134mph (130 is the fastest I've gone) so your 136 sounded pretty good to me. I feel like my right foot is in slow motion getting to the brake pedal there and I'm too old to learn left foot braking so I'll happily settle for my 130.

Joe mentioned 80mph at the apex of 6, I've gotten there a few times but find it hard to consistently judge the proper entry speed there lap after lap. The car will happily do it, I just overbrake most of the time.

daveo4porsche

for left foot braking I suggest the following

• 3 day course @ Dirt Fish - https://www.dirtfish.com - this WILL improve your track driving and it's super fun to boot! ProTip: they have thanksgiving Black Friday sales the past few years, typically $1000 off the 3 day courses if you sign up on that day!! Future dates listed - don't stress over the RWD vs. AWD course, you'll learn a LOT in both - and you'll come back to tracking and you WILL be quicker - I promise.
• and then practice at a track that you know... I simply decided to left foot brake starting Thursday last week - by Friday I was very natural - turns out in my case my left foot has better sensitivity for the brake and pressure modulation was greatly improved - and it's actually easier when you're not "rushing" to get back to throttle - can "feed" throttle in as you're releasing the brake…it's wonderful in a PDK car…

this past 4 days @ Laguna Seca was all done left foot braking for the 1st time in my participation in this hobby - I now see there is no way to go back...it's just so much easier to balance the car at all points on track for precise control.

regarding the 136 mph number - I'm certain I was north of 130 mph - it's unclear what the significant digit is - I've noted a 2 mph discrepancy between Porsche Speedometer in the car (both analog and digital) vs. the GPS speed reported by my Racelogic vBox HD2 video system - the Porsche speedo is about 2 or 3 mph "faster" than the GPS speed reported by vBox - I'm not sure who is accurate, but I'm going to suggest the vBox system since it's time/distance based from the GPS data, rather than wheel rotation based…

the 136 mph is what I "saw" on the Porsche speedo - I've yet to review that lap in vBox…I'll look tonight.

daveo4porsche

131 mph as measured by the vBox - 211.3 kph (according to data) - so about in the same ball park as the .1 GT3 at the end of the front straight - in the pic below you can also see the "speed" data channel - it's a flat curve since there was no lift - date and time are in the photo…

daveo4porsche

I'm really pleased - when I started the weekend my "bank" lap was a 1:42 or 1:43 - i.e. I could do that lap all the time...after this weekend my "bank" lap is now a 1:39.xx or 1:40.xx - with occasional drops into the 1:38 territory…and I think I know how to get to the 1:37 with some minor changes - next stop 1:36.xx as I've noted - I'll let Joe "keep" his 1:34.xx time as that's tooo extreme for my tastes - I think if you review my wheel work in the cockpit it's clear Joe is working the car harder and faster…I don't like being that close to the edge…and we can all work toward Jessie's 1:33.10 lap in his GT3 RS 4.0 (997) - https://fastestlaps.com/tests/7kiase9bog5g

orthojoe

@daveo4porsche , yes, the speedometer in the car always reads higher than GPS speed. I like to use GPS speed since it's more uniform across makes and models. As you know, even 2 mph at the end of the straight is substantial and the equivalent of adding a substantial amount of HP, which is why exiting T11 well and staying flat through T1 makes a difference. If you look at my RS video and compare it to my .2 GT3 video at Laguna, it's a good example of how exiting T11 right makes a big difference. IMO, the terminal velocity between the 2 cars should be similar. The higher hp in the RS is negated by the increased aero. Done identically, I can't imagine more than 1mph difference between the two. However, in my RS I hit 139mph and I only hit 134mph in the .2GT3. My driving continues to evolve, and you can see the evolution between the several months between the 2 runs. In the RS, I'm literally driving all 4 wheels on the paint at the exit of T11. In the .2 GT3, traffic prevented me from exiting all the way wide, but even when I didn't have traffic at the end of the lap, I didn't exit all of the way out to the paint. 5mph is A HUGE difference in terminal velocity.


on the paint


Bah, it's all relative. Don't put up a wall in front of yourself when you can clearly go past it. A fast lap is still a smooth lap. My fast laps are always totally under control. It's the sloppy laps where you are going over of the edge that are slow. My best advice is that if you ever feel like you're supposed to go faster through a corner, but the car won't do it, you need to re-think your line. 2nd piece of advice is to keep adjust your line to find a way to power out sooner. It's funny how when I drive at 6-7/10ths to reset a lap or do a lead follow (or coach checkout ride....for those that saw that infamous video), what seems like a slow and boring lap is actually just as fast as laps that felt like I was going 10/10ths over a year ago. The solution to driving faster is never to drive harder. BTW, Jessie's lap was on a fresh set of Hoosiers. He's definitely a better driver than me, but a tire difference like that will make a GT4 faster than a GT3. I also know he would be even faster now with the changes made to the track.

TRAKCAR

This, nobody has more boring video’s then me, nothing seems to happen, even tough the car is rotating fine.
Fast or slow, looks mostly the same. And i’m not slow everywhere.

daveo4porsche

@orthojoe @TRAKCAR thanks guys - I'll work harder 1:36.xx is _NEXT_ but I'll take better!

RDCR

No wonder I can't get into 1:30s I thought there was still Astro turf outside the curb at 11.

MaxLTV

FWIW 991.1 GT3 is hitting 135 there with early braking and tight first apex line and up to 136 with later braking and wider first apex line (both seem to be valid approaches with similar results). The exit of 11 is very important, as Joe said, and no lift up top. With the correct line, the steering wheel is almost straight over the crest, so there is no G-load on the car when it gets light. (e.g. )

I also overbake for 6 (because I'm scared).

MaxLTV

That's my problem - if the car does not slide much, I get bored and lose focus or start sliding on purpose. But sliding is slower, less consistent and kills tires :-(