Launching on a prepped track (sub 2.0 60')
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Junior Member
Joined: Mar 2017
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2017 C63S AMG Coupe
Launching on a prepped track (sub 2.0 60')
Heading up to Bandimere this afternoon to get a few runs in. I'm wanting 100 stock vs piggyback tune (via MPH difference). Obviously, I would like to get the best ET as well. Now my question for those that have gotten sub 2 second 60's.... How are you launching?
1. Are you using race start, brake-torque, or just going full throttle off the line.
2. ESP in race or completely off?
3. Auto shift or manual? (I think I will run auto for the sake of consistency since the MPH difference is my #1 goal this evening)
I plan on running the car in Race mode, auto and will be on 100 octane with 295 RE-71R's for tires. Will be doing a pull without the tune, on map 4 and then another on either map 8 or 9 as well.
Hoping to crack an 11, but that may be a bit too optomistic since we are in Denver and the DA is already 6240 ft. and will be 8000ft+ this afternoon.
1. Are you using race start, brake-torque, or just going full throttle off the line.
2. ESP in race or completely off?
3. Auto shift or manual? (I think I will run auto for the sake of consistency since the MPH difference is my #1 goal this evening)
I plan on running the car in Race mode, auto and will be on 100 octane with 295 RE-71R's for tires. Will be doing a pull without the tune, on map 4 and then another on either map 8 or 9 as well.
Hoping to crack an 11, but that may be a bit too optomistic since we are in Denver and the DA is already 6240 ft. and will be 8000ft+ this afternoon.
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From: Austin, TX
2017 Porsche 911 C4
The best I've managed stock is a 1.978 60' ft (11.6@121.74).
Race mode:
- Suspension on hardest setting
- Auto shifting
- ESP Sport On
I dropped my rear tire pressure to 32 psi (stock PSS's) and used Race start.
I've heard that some have had success with brake boosting instead of Race start, but I haven't tested it out. Curious to see other peoples launch techniques
Good luck!
Race mode:
- Suspension on hardest setting
- Auto shifting
- ESP Sport On
I dropped my rear tire pressure to 32 psi (stock PSS's) and used Race start.
I've heard that some have had success with brake boosting instead of Race start, but I haven't tested it out. Curious to see other peoples launch techniques
Good luck!
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Posts: 248
Likes: 19
2017 C63s Sedan | 2016 Yukon XL Denali
I have a picture of a 1.907 60' time. This was a 11.701 1/4 mile run. I managed a 11.68 as well, but no picture.
Stock tires, engine, etc.
Full tire pressure
1/2ish tank of gas
What I did:
Car in Race mode
Traction control all the way off
Get a little water on rear tires
Small burn out to warm tires (fun to watch with the 360 camera)
Pull up to line and engage race start
At first yellow light, gas pedal down
Third yellow light, brake pedal up
This way, I'm actually still pressing down on the gas as I launch and I had excellent grip
Keep pedal to floor until the end....
Oh, and this run was my FIRST EVER 1/4 mile run in this car. I was very impressed.
Stock tires, engine, etc.
Full tire pressure
1/2ish tank of gas
What I did:
Car in Race mode
Traction control all the way off
Get a little water on rear tires
Small burn out to warm tires (fun to watch with the 360 camera)
Pull up to line and engage race start
At first yellow light, gas pedal down
Third yellow light, brake pedal up
This way, I'm actually still pressing down on the gas as I launch and I had excellent grip
Keep pedal to floor until the end....
Oh, and this run was my FIRST EVER 1/4 mile run in this car. I was very impressed.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 1,537
Likes: 372
From: Austin, TX
2017 Porsche 911 C4
I thought the same and actually tried it several times in Comfort suspension and got horrible wheel hop, ended up running mid-12's because of it. The stiffest suspension setting worked best for me on this particular surface, it launched perfectly.
Thread Starter
Junior Member
Joined: Mar 2017
Posts: 20
Likes: 4
2017 C63S AMG Coupe
Ok, tried a few methods here. I was on a RE71R tire (295) @ 40psi
Mode: Race
ESP: Race
Race start: yes
Managed a couple 2.2-2.4 60' Car would actually bog. Not sure if track prep was on fire, these tires are just too sticky, or a combination of both.....
Mode: Race
ESP: Completely off
Race start: yes
Same as before. 2.2-2.4 60' Too much traction.
Mode: Race
ESP: Off
Race start: No, brake-torque off the line.
2.4 60' Car immediatly spun hard in 1st as soon as I came off the brake. Need more tire to launch using this method.
Sooo, looks like I still need to figure out how to get a good 60' up here.
Mode: Race
ESP: Race
Race start: yes
Managed a couple 2.2-2.4 60' Car would actually bog. Not sure if track prep was on fire, these tires are just too sticky, or a combination of both.....
Mode: Race
ESP: Completely off
Race start: yes
Same as before. 2.2-2.4 60' Too much traction.
Mode: Race
ESP: Off
Race start: No, brake-torque off the line.
2.4 60' Car immediatly spun hard in 1st as soon as I came off the brake. Need more tire to launch using this method.
Sooo, looks like I still need to figure out how to get a good 60' up here.
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Posts: 2,838
Likes: 69
From: Los Angeles
'16 C63-S
Ok, tried a few methods here. I was on a RE71R tire (295) @ 40psi
Mode: Race
ESP: Race
Race start: yes
Managed a couple 2.2-2.4 60' Car would actually bog. Not sure if track prep was on fire, these tires are just too sticky, or a combination of both.....
Mode: Race
ESP: Completely off
Race start: yes
Same as before. 2.2-2.4 60' Too much traction.
Mode: Race
ESP: Off
Race start: No, brake-torque off the line.
2.4 60' Car immediatly spun hard in 1st as soon as I came off the brake. Need more tire to launch using this method.
Sooo, looks like I still need to figure out how to get a good 60' up here.
Mode: Race
ESP: Race
Race start: yes
Managed a couple 2.2-2.4 60' Car would actually bog. Not sure if track prep was on fire, these tires are just too sticky, or a combination of both.....
Mode: Race
ESP: Completely off
Race start: yes
Same as before. 2.2-2.4 60' Too much traction.
Mode: Race
ESP: Off
Race start: No, brake-torque off the line.
2.4 60' Car immediatly spun hard in 1st as soon as I came off the brake. Need more tire to launch using this method.
Sooo, looks like I still need to figure out how to get a good 60' up here.
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Banned
Joined: Feb 2012
Posts: 2,838
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From: Los Angeles
'16 C63-S
Banned
Joined: Feb 2012
Posts: 2,838
Likes: 69
From: Los Angeles
'16 C63-S
MBWorld Fanatic!
Joined: Dec 2012
Posts: 1,537
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From: Austin, TX
2017 Porsche 911 C4
You really do need to drop the tire pressure. 40 psi is crazy high if you're trying to get a good hole shot. Definitely go back and try again at 32psi or lower, and play with the suspension stiffness as that effects the launch as well.
Thread Starter
Junior Member
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2017 C63S AMG Coupe
Gentleman.... The issue isn't lack of traction.... I have too much which is causing a bog... Generally, lower tire pressure = more contact patch and less stiffness in the sidewall. I need some spin to carry me through the bog, hence why I didn't drop pressure.
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From: SoCal
2016 C63S Sedan
In race start I don't think it is bogging but the race start computer is controlling the wheel spin.
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From: Austin, TX
2017 Porsche 911 C4
Clearly you know better than us, keep it at 40 psi and good luck for next time
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Joined: Jun 2015
Posts: 643
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From: Houston, TX
'15 C63S
I think you are missing what they are saying. The runs you did with launch control didn't bog because of too much traction but instead that the ESP (even though it's off) is working with the launch control and preventing the wheel spin. You don't have an excess amount of grip; you have an excess amount of ESP intervention. And this is more than likely caused by tire pressures that are too high, causing lack of traction, with an end results of ESP intervening and making it feel like the car is bogging down.
The simple fact that you could significantly break traction from a non-launch control start means you do not have too much traction. If anything, that would be the launch method that should be the hardest to cause excessive wheel spin. You'd think dumping the clutch at 3K-4K RPM like launch control does would be way, way more likely to prevent any sort of bogging.
Thread Starter
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2017 C63S AMG Coupe
I'm not saying I do or don't, however, this isn't my first rodeo on a track. Prior to this I had a low 9 second GT-R that saw regular track duty.
I think you are missing what they are saying. The runs you did with launch control didn't bog because of too much traction but instead that the ESP (even though it's off) is working with the launch control and preventing the wheel spin. You don't have an excess amount of grip; you have an excess amount of ESP intervention. And this is more than likely caused by tire pressures that are too high, causing lack of traction, with an end results of ESP intervening and making it feel like the car is bogging down.
The simple fact that you could significantly break traction from a non-launch control start means you do not have too much traction. If anything, that would be the launch method that should be the hardest to cause excessive wheel spin. You'd think dumping the clutch at 3K-4K RPM like launch control does would be way, way more likely to prevent any sort of bogging.
The simple fact that you could significantly break traction from a non-launch control start means you do not have too much traction. If anything, that would be the launch method that should be the hardest to cause excessive wheel spin. You'd think dumping the clutch at 3K-4K RPM like launch control does would be way, way more likely to prevent any sort of bogging.
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Joined: Jun 2015
Posts: 643
Likes: 92
From: Houston, TX
'15 C63S
The brake torque method causes positive vacuum where LC doesn't. This would result in more torque, much sooner than just using LC, which would result in wheel spin. Lowering pressure in the tires wouldn't have salvaged the run.
I'm not saying I do or don't, however, this isn't my first rodeo on a track. Prior to this I had a low 9 second GT-R that saw regular track duty.
I'm not saying I do or don't, however, this isn't my first rodeo on a track. Prior to this I had a low 9 second GT-R that saw regular track duty.
I understand what's being said. You're stating that even with ESP off, it still regulates traction when using LC? I was under the impression that with ESP defeated, it completely eliminates traction intervention, with and without LC being used. I've lit my tires up pretty hard a few times with it completely off.
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From: SoCal
2016 C63S Sedan
"As I said above, my understanding is that with launch control enabled you are still going to see intervention from ESP in that it will still attempt to control wheel spin. After all, isn't that the point of a launch control system?"
+1
+1
