2014 86CUP Challenge to NorCal with NCRC

[sw20kosh]

Originally Posted by Chopstick

This was one of my cleaner laps this weekend at Thill. Any ideas on how I can pick up some time? I i couldn't improve on my PB, but I feel like my lines are a lot cleaner than before. I think need to dial in some more front camber because the car understeers A LOT.

Thanks in advance for any input!

You can take turn 1 much faster due to it being uphill. With decent tires you should be accelerating out of the apex at ~85 mph and using that acceleration to track the car all the way out to the right berm ending up with a lot of speed.

It takes balls to take some of these turns at speed but once you do your lap times improve considerably.

Here is an example from back when I was NA complete with noises from my passenger lol:
[ame]http://youtu.be/j_qdpd6S4zs[/ame]

[ddeflyer]

Originally Posted by sw20kosh

I would not stay in 4th for 9 which is uphill. Especially if NA. You need acceleration up that hill. Use gravity to gain grip in this turn (you can take it a lot faster than you think kinda like turn 1).

Turn 9 is a crazy fast turn if taken right, and third gear will probably have you changing gears barely after the crest. For me the thing that made me choose to stay in 4th is that I don't want to waste the acceleration I can get going down the hill by having to shift. Unfortunately I am not good at getting my entry speed right on the turn (I keep over braking it) so I loose a decent chunk of time there.

As always YMMV, but give it a try and see how you like it.

[acx23]

I couldn't watch through the video. Sorry. I really can't give good input when I can't see what you're doing and the whole track.

Next time, mount the goPro in the cockpit so you can see A pillar to A pillar, your steering and your shifting. I mount mine at the top of the rear windsheld inside the car.

And please, no music either because hearing the car is also vital.

Hope you had fun.

Originally Posted by themajesticone

Hey guys - here are a couple laps from my last session this past weekend. First track day ever. Any criticisms? Unfortunately I didn't have that app to measure my speeds but hopefully you can still get an idea if my pace was decent. thanks!

[acx23]

I heard it was pretty hot this past weekend so the track was probably pretty greasy. Regardless of that, if you're understeering a lot, then it usually means your tires are over inflated. Do you know what PSI you were at? If not, then there's your issue.

Originally Posted by Chopstick

This was one of my cleaner laps this weekend at Thill. Any ideas on how I can pick up some time? I i couldn't improve on my PB, but I feel like my lines are a lot cleaner than before. I think need to dial in some more front camber because the car understeers A LOT.

Thanks in advance for any input!

[CSG Mike]

Originally Posted by sw20kosh

toyota/subaru overated the numbers.

Originally Posted by RehabJeff86

Holy mother of Teresa.... How da hell so much hp and tq lost via drivetrain?!?

The car doesn't make 200hp on CA 91

[ddeflyer]

Originally Posted by sw20kosh

You can take turn 1 much faster due to it being uphill. With decent tires you should be accelerating out of the apex at ~85 mph and using that acceleration to track the car all the way out to the right berm ending up with a lot of speed.

It takes balls to take some of these turns at speed but once you do your lap times improve considerably.

Here is an example from back when I was NA complete with noises from my passenger lol:

Nice video

[mkivsoopra]

Originally Posted by ddeflyer

For some reason the GPS data isn't included so I am really guessing on some of the data. That said I see some vertical movement going on I think around turn 7. I have some matching but smaller amplitude movements on my data. A bit after this I see signs of the traction control coming on (small increase in brake system pressure).

My very poor guess is that your suspension issues upset the car enough to cause the traction control to come on which then behaved in a bad way to the TC's confused attempts to help the car. That said I'm not even certain exactly where the bits of the graph fall on the course because of the lack of GPS data.

Hmm.. how about this set of files? It's pretty much everything related to that download. Previously, I attached the output of the "Export Test Run" option. Thanks!

Too big to attach, so I've put it here: http://www.mkivsoopra.com/BRZ/GarlandBRZ03082014.zip

[CSG Mike]

Originally Posted by acx23

I've only successfully got the pedal dance to work for me once. The car has to be warmed up or it will not work. I've ran all year (~10 track days) with just turning the traction control off by holding it down for 5 secs. I've read arguments that it doesn't turn off the traction completely but I don't think it's true. I had zero interference just by turning it off complete.

It'll start intervening as you get faster

[Chopstick]

Originally Posted by sw20kosh

You can take turn 1 much faster due to it being uphill. With decent tires you should be accelerating out of the apex at ~85 mph and using that acceleration to track the car all the way out to the right berm ending up with a lot of speed.

It takes balls to take some of these turns at speed but once you do your lap times improve considerably.

Here is an example from back when I was NA complete with noises from my passenger lol:

I agree that I'm taking t1 too slow. I feel like im braking too much entering the turn. My turn in speed is usually around 78-80 mph. Ill just try to be more ballsy next time I guess.

Originally Posted by acx23

Your car looks pretty set up. Here's what I saw -

T1 - get closer to the left apex and track out more on the right.
T2 - you started hugging left about a second too early. that's why your exit was messed up.
T6 - turned in about 1/2 - 1 second too early. again, that messed up your exit.
T11 - no need to get into 2nd gear, just stay in 3rd. unless you're in traffic or something.
T14 - i feel you can wait another split second before turning it, going into the run off that much to the left kills your time too.

Hope this helps.

Thanks for the input! I'll try to keep these tips in mind.

Originally Posted by ddeflyer

Was that a 2:17 lap on the bypass? If so, not bad.

Some small things:

For 9, try staying in fourth and let the car track left before coming back right.

You are pinching turn 12a or whatever it is called (exit of the esses). Let the car track right so you don't scrub as much speed.


You are also adding steering in some turns in an odd way. This is decreasing your traction and slowing you down some. There are some places where this can be a valid technique to trigger oversteer for thrust angle, but I think you are doing it in places you don't want to be (turn 1 for example).

I was doing low 2:18's. I think I'm adding steering in some turns to compensate for the understeer. I feel the car plowing a bit so I add a bit more steering angle to compensate. Thus why I think I need to dial in more front camber.

[Chopstick]

Originally Posted by acx23

I heard it was pretty hot this past weekend so the track was probably pretty greasy. Regardless of that, if you're understeering a lot, then it usually means your tires are over inflated. Do you know what PSI you were at? If not, then there's your issue.

I was at 32 hot. I was monitoring my psi's after every session. The car felt better as I let out the air, but was still getting understeer.

[acx23]

What tires are you running? I'm on street tires so I run higher psi when hot. There is no amount of camber you can dial in when the track is greasy/dry wet. Just got to fight it.

Originally Posted by Chopstick

I was at 32 hot. I was monitoring my psi's after every session. The car felt better as I let out the air, but was still getting understeer.

[ddeflyer]

Originally Posted by Chopstick

I agree that I'm taking t1 too slow. I feel like im braking too much entering the turn. My turn in speed is usually around 78-80 mph. Ill just try to be more ballsy next time I guess.




Thanks for the input! I'll try to keep these tips in mind.




I was doing low 2:18's. I think I'm adding steering in some turns to compensate for the understeer. I feel the car plowing a bit so I add a bit more steering angle to compensate. Thus why I think I need to dial in more front camber.

Adding steering while understeering is a good way to spin. Basically you add steering, get a little effect and then the weight shifts and puts more pressure on the front wheels and suddenly you get alot more lateral force going and.... bye bye.

[ddeflyer]

Originally Posted by mkivsoopra

Hmm.. how about this set of files? It's pretty much everything related to that download. Previously, I attached the output of the "Export Test Run" option. Thanks!

Too big to attach, so I've put it here: http://www.mkivsoopra.com/BRZ/GarlandBRZ03082014.zip

This one worked. Looking at it, assuming the traction control would show a pressure bump on activation (not sure on this), then the traction control didn't come on until it was too late to do anything. I would guess the bumping suspension just changed grip all over the place, started some small oscillations left/right which just made a mess of things.

And of course requisite "I don't know what I am doing, I've only had a logger for a few weeks. Ask someone with more experience for their opinion."

[themajesticone]

Originally Posted by acx23

I couldn't watch through the video. Sorry. I really can't give good input when I can't see what you're doing and the whole track.

Next time, mount the goPro in the cockpit so you can see A pillar to A pillar, your steering and your shifting. I mount mine at the top of the rear windsheld inside the car.

And please, no music either because hearing the car is also vital.

Hope you had fun.

sorry I added music because its pretty much 90% wind noise so you can barely hear anything else at all. thought wind noise would be annoying