Tyres struggling for grip when launching
11 August 2013, 02:42 AM
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Tyres struggling for grip when launching
Ive just been out in my car and launched her a few times, only this time the front tyres seem to be struggling for grip. I have launch control, brought the clutch up to the biting point, then launched and the tyres were sort of rumbling, and spinning on the spot, steering wheel was shaking too. Last time I launched the tyres made a slight chirp then off she went. Tyres have around 6mm all round. Conditions were dry. Is it my launch technique? DCCD was in auto.
Last edited by TylerDurden; 11 August 2013 at 04:03 AM.
11 August 2013, 11:38 AM
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Road conditions? Anything other than bone dry will offer less grip.
Tyre quality? As TT says ditchfinder specials will have less grip than premium brands.
Tyre temperature? Cold tyres have less grip than warm tyres, hence burnouts on 2WD cars.
Launch RPM? You don't need to launch above your peak BHP rpm. Although it's the tourque that gets you moving, if you launch at peak torque the rpm will drop too far and you will bog down. A little wheel spin is better than bogging.
DCCD setting? You're unlikely to get a clean launch with the DCCD in auto. Wind it back so you have some lock, last or next to last orange.
Tyre quality? As TT says ditchfinder specials will have less grip than premium brands.
Tyre temperature? Cold tyres have less grip than warm tyres, hence burnouts on 2WD cars.
Launch RPM? You don't need to launch above your peak BHP rpm. Although it's the tourque that gets you moving, if you launch at peak torque the rpm will drop too far and you will bog down. A little wheel spin is better than bogging.
DCCD setting? You're unlikely to get a clean launch with the DCCD in auto. Wind it back so you have some lock, last or next to last orange.
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11 August 2013, 05:27 PM
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Road conditions? Anything other than bone dry will offer less grip.
Tyre quality? As TT says ditchfinder specials will have less grip than premium brands.
Tyre temperature? Cold tyres have less grip than warm tyres, hence burnouts on 2WD cars.
Launch RPM? You don't need to launch above your peak BHP rpm. Although it's the tourque that gets you moving, if you launch at peak torque the rpm will drop too far and you will bog down. A little wheel spin is better than bogging.
DCCD setting? You're unlikely to get a clean launch with the DCCD in auto. Wind it back so you have some lock, last or next to last orange.
Tyre quality? As TT says ditchfinder specials will have less grip than premium brands.
Tyre temperature? Cold tyres have less grip than warm tyres, hence burnouts on 2WD cars.
Launch RPM? You don't need to launch above your peak BHP rpm. Although it's the tourque that gets you moving, if you launch at peak torque the rpm will drop too far and you will bog down. A little wheel spin is better than bogging.
DCCD setting? You're unlikely to get a clean launch with the DCCD in auto. Wind it back so you have some lock, last or next to last orange.
Last edited by TylerDurden; 11 August 2013 at 05:30 PM.
11 August 2013, 05:33 PM
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the launch control is set to 5k rpm, the first time I tried launching after the car was mapped, I had the clutch fully depressed then let go of it, the car did bog down, this time I thought it better to bring it up to the biting point, then let go, I didnt slip it at all. Im wondering if I should have slipped it for may be 2 or 3 seconds? When the wheels were spinning, the wasnt going anywhere, just spinning on the spot.
11 August 2013, 05:44 PM
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Thanks, so the procedure would be this, lock diff, clutch up to biting point, launch, change gear, stick diff to auto. Sorry about the millions of questions, just trying to get it clear in my head!
Last edited by TylerDurden; 11 August 2013 at 05:45 PM.
11 August 2013, 05:49 PM
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11 August 2013, 06:05 PM
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Side step the clutch.....you would need to have variable settings on launch control for it to work on different variants...ie surface, temp, conditions, tyres etc....
First orange seems to work for me....classic with 6 speed dccd ...1.6 60ft on r888
First orange seems to work for me....classic with 6 speed dccd ...1.6 60ft on r888
11 August 2013, 06:08 PM
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11 August 2013, 11:01 PM
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Ive just been out in my car and launched her a few times, only this time the front tyres seem to be struggling for grip. I have launch control, brought the clutch up to the biting point, then launched and the tyres were sort of rumbling, and spinning on the spot, steering wheel was shaking too. Last time I launched the tyres made a slight chirp then off she went. Tyres have around 6mm all round. Conditions were dry. Is it my launch technique? DCCD was in auto.
Last edited by The Trooper 1815; 11 August 2013 at 11:03 PM.
11 August 2013, 11:08 PM
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Cheers Iain
12 August 2013, 09:02 AM
#19
Its whatever technique works for you. I just sidestep the clutch the only drag days I have ever done have only been in wet/damp conditions and on toyo t4rs at road pressures an did. 1.8 60ft.
12 August 2013, 05:38 PM
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erm, thanks for your very valuable contribution.
12 August 2013, 05:55 PM
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Appreciate your concern, I know these car's cost a fortune to run, but the thread isnt about my financial predicament.
If I break the drivetrain it will be my own fault.
Trooper seems quite hypocritical, we drive impreza's not micra's.
If I break the drivetrain it will be my own fault.
Trooper seems quite hypocritical, we drive impreza's not micra's.
12 August 2013, 05:56 PM
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12 August 2013, 06:01 PM
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Thank Iain, I had assumed it would be less of a shock to the gearbox by bring the clutch up, I also thought it would be faster, but according to Torque app I was actually alot slower.
