yell03

Here are the graphs....
The top 2 are the C8Z and the bottom two are my 2015 Porsche 911 Turbo S


C8 Z06 invalid

C8 Z06 valid

Porsche Turbo S invalid

Porsche Turbo S valid

yell03

For comparison...

Here is my previous 2023 C8 Z51 results

turbotuner20v

that's not bad, I was expecting more drop in G from any TC/bogging. the invalid run was really off to a great start till it quickly lost traction, but respectable that PTM Sport still kept it above .5g while it sorted things out

yell03

I definitely want to wait until warmer weather to try this again.
I think the 10% slip is definitely losing me some time.
I wonder if I should try the auto launch control?

I really don't want to do this too many times, I would like to get an 1/8th in to see how the trap speed compares to my Porsche.

The Porsche launches are always above 1g, AWD is amazing on the street.

turbotuner20v

The slip is the allowed wheel spin before TC steps in. Lowering to 5% might not be the best option since you want some wheel speed

I'd do the Competitive Driving setting next for a 0 TC intervention to see what happens, then work your way down in allowed slip from higher % to lower % under PTM Sport

AzDave47

^^ My recollection is that 5000 RPM was the max for the custom launch RPM. Are you putting it in something different than the PTM launch modes?

turbotuner20v

Max of 5000 is correct, that was a gm engineering slide from a bash presentation and it had the higher than allowed 5500

yell03

I thought slip % was like slipping the clutch?
At 10% and I tried higher one time, you can feel the car easing out.
At 5% it would be a harder hit, almost like dumping the clutch and then it would most likely bog.
The car auto setting for launch control is set at 3500 rpms with 5% slip. I guess I should try that one time.
Again, I don't want to beat on the car too much trying to find the perfect setting.

Hopefully I can get some people who have had good Dragy results on unprepped surfaces to share their settings.
I don't want in-car PDR results, on my previous C8 Z51 it always said 2.8, even when the Dragy was 3.3s.

turbotuner20v

Picture 'slip %' like a line graph starting from 0 and measuring wheel speed at the front wheels vs rear wheels.

When there is zero slip the 2 line graphs overlap entirely and rise together.

If the rear wheel line graph starts to exceed the front wheel line graph, that means wheel spin is occurring at the rear wheels

10% slip allows that rear wheel line graph to exceed the front wheel line graph by 10% before traction control intervenes

If you spin for 60' in the 8-10% wheel slip zone this might feel 'soft' on the leave. If you slip 5% and the TC chops down, it bogs and then picks back up, this may feel like a stronger surge, but may not be smoother/faster.

It's very cool GM allows this type of configuration on the stock ECU. I only gained access to these types of parameters on my GTR by using a custom tune

yell03

I did 2 runs today...
In Sport Mode Competitive Driving Mode
Tire temps were Normal and pressures were 35lbs

one auto launch control and and one 4000rpms at 10% slip.



The auto launch control was a 2.02 60' and 0-60 in 3.19
The 4000rpms 10% slip was a 1.88 60' and 0-60 in 3.19

Here are the Dragy graphs


1.88 60' 4000rpms 10%

2.02 60' auto launch control

4000 10%

vegasredz062

I dont know what you are saying lol.....

here is what I know the higher the slip the longer it takes to release the clutch .. quit embarrassing when its at 4500 and 10%+ slip... you can eat a burger by the time it releases the clutch

turbotuner20v

That 4000 10% looks better on the launch, but then it just doesn't pull as hard 30-60mph for some reason. Combo of best of both runs might be sub-3

turbotuner20v

Clutch slip is aligned to RPM selection
Slip % is tires / TC

Z0HS1CK

God i can't wait for warm weather so i can try launch control.

I'm tired of watching youtube videos of others doing it lol.

yell03

This is correct, it rides the clutch out. When I used to drag race often, I did not like slipping the clutch, I was a quick release guy, but I must admit back then my best 1.68 60' in my 2001 Viper GTS came by riding the clutch out.

Probably a difference in slightly uphill.
It shows, for most people not in to racing they could just leave it at auto 3500 5% and not lose much time and not waste their time trying to figure out the best launch settings.
I think in warmer weather sub 3s will be attainable, for 50-55 degrees on summer rubber 3.19 is not bad, just don't challenge any fairly high hp AWD cars from a dig.
For example, my Porsche is only 543whp, the C8 Z06 is probably over 600whp, the Porsche would destroy it from a dig in sub 60 degree weather for sure.

Warm weather should get you sub 3s, get a Dragy, no in-car PDM numbers below that always read sub sub 3.

yell03

66 degrees today, did two 0-60s, tire pressures were up at 37lbs due to the warmer weather.

Put car in Sport Mode pressed tc button twice to get in competitive driving mode, set launch control to auto. Car had a FULL tank of 93.

Not optimal conditions, but what the heck...

Car bogged a bit after it launched, still ran a 3.17 and a 3.19 per my Dragy with rollout factored in. 1.97 60'.

Came home and dropped my tire pressures to 32lbs, they were at 35lbs after cooling down a bit.

The problem now is it is cold in the morning and warm in the afternoon so my tire pressures are higher than I would like them when trying 0-60s.

I believe on a warmer day, half tank, and tire pressures around 32lbs warm sub 3s should be easily attainable. It just needs to hook without bogging.

In comparison, my 2023 C8 Z51 was always consistent 3.3s with rollout, so the C8 Z06 is quicker 0-60, after 60 it is really accelerating hard.

I also aired down my Porsche 911 Turbo S tires to 32f/34r today, would like to get a sub 2.6 0-60 run for the record. In cold weather it is consistently in the low-mid 2.6s.