launch control, hows it work

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launch control, hows it work

Postby Fred » Fri Aug 13, 2004 6:26 pm

Just curious....
How does launch control work??? limits the revs to a point u choose for launch say 2500? then what? so u can floor it and revs hold at the set point? and as soon as u start going the revs fly up as per normal? i duno if it works like that cause then ud jst get a truck load of wheel spin anyhoo.

and if u got it wud u see a difrnc in time? wud the bigest time gain jst b in reaction times?

cheers
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Postby Adydas » Fri Aug 13, 2004 6:28 pm

i think the advantage of it is.. you can launch as hard as possible But you find the rev point just before wheel spin.. so you can take off perfectly everytime..so really it dont make you wheel spin.. it lets you take off at point just before..

yes no?
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Postby Bazda » Fri Aug 13, 2004 6:50 pm

dont worry fred, your car takes off fine u dont need one
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Postby Adydas » Fri Aug 13, 2004 7:01 pm

err that didnt answer his questoin.. peniss
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Postby Fred » Fri Aug 13, 2004 7:46 pm

haha yea u peniss =) dont want one barry jst curious as to how it works. nice avatar, is that the pic i took? and u said i took stupid angle pics
White Trueno ae92, 4agte
172kw atw and as bazda put it "lowest reading dyno in auckland"
http://toyspeed.blakjak.net/profiles/profile.php?id=672
http://www.cardomain.com/ride/2124212/1

Black and Gold Trueno ae92, 4agze
14.6@152 (hmmm thats a .69)
http://www.cardomain.com/ride/2160441
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Postby Fred » Fri Aug 13, 2004 7:48 pm

haha yea u peniss =) dont want one barry jst curious as to how it works. nice avatar, is that the pic i took? and u said i took stupid angle pics.

blak is shiny blak is good blak is fun but blak and gold is old skool
White Trueno ae92, 4agte
172kw atw and as bazda put it "lowest reading dyno in auckland"
http://toyspeed.blakjak.net/profiles/profile.php?id=672
http://www.cardomain.com/ride/2124212/1

Black and Gold Trueno ae92, 4agze
14.6@152 (hmmm thats a .69)
http://www.cardomain.com/ride/2160441
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Postby Fred » Fri Aug 13, 2004 7:51 pm

sorry bout the dubl post, in a way i guess its good mayb one day il move a step up from new poster ha, but not soon im guessing
White Trueno ae92, 4agte
172kw atw and as bazda put it "lowest reading dyno in auckland"
http://toyspeed.blakjak.net/profiles/profile.php?id=672
http://www.cardomain.com/ride/2124212/1

Black and Gold Trueno ae92, 4agze
14.6@152 (hmmm thats a .69)
http://www.cardomain.com/ride/2160441
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Postby Bazda » Fri Aug 13, 2004 7:56 pm

u could of just looked it up on the net on how they work..easy az u peniss
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Postby Adydas » Fri Aug 13, 2004 8:02 pm

look dont make me hit you to together..

2 penisis touching like thats just ghey
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Postby Fred » Fri Aug 13, 2004 8:03 pm

so ur saying that u think toyspeed is a stupid idea? nearly every question asked on toyspeed im sure u cud find an answer sumwhere on the net.
i had a quick look and i got random stupid stuff, much easier to rely on the brains of the likes of u
White Trueno ae92, 4agte
172kw atw and as bazda put it "lowest reading dyno in auckland"
http://toyspeed.blakjak.net/profiles/profile.php?id=672
http://www.cardomain.com/ride/2124212/1

Black and Gold Trueno ae92, 4agze
14.6@152 (hmmm thats a .69)
http://www.cardomain.com/ride/2160441
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Postby Bazda » Fri Aug 13, 2004 8:09 pm

Adydas wrote:look dont make me hit you to together..

2 penisis touching like thats just ghey

YUCK 8O
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Postby Adydas » Fri Aug 13, 2004 8:11 pm

AMAZEING what the search button does ti..
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Postby kingcorolla » Fri Aug 13, 2004 10:11 pm

i think it works like, when you launch, the controller precicely misfires at certian points to control wheel spin,
This is very effective on forced induction because the missfire causes a change of heat and pressure differential across exhaust turbine, and therefore turbo spools up FASTER.
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Postby matt dunn » Sat Aug 14, 2004 12:06 am

kingcorolla wrote:i think it works like, when you launch, the controller precicely misfires at certian points to control wheel spin,
This is very effective on forced induction because the missfire causes a change of heat and pressure differential across exhaust turbine, and therefore turbo spools up FASTER.


Dont mix up traction control and launch control as they are different.

Launch control is just a clutch activated rev limiter that can be adjusted.

Traction control requires wheel speed sensors and launch control does not.
Last edited by matt dunn on Sun Aug 15, 2004 10:00 pm, edited 1 time in total.
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Postby Al » Sat Aug 14, 2004 12:32 am

Gotta watch launch controllers on turbo toyotas, cos while you are sitting there with the revs holding on whatever revs, you are possibly backfiring away....a large enough backfire could trip ur knock sensor and you will have one very slow drag race :lol:
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Postby kingcorolla » Sat Aug 14, 2004 1:24 am

matt dunn wrote:
kingcorolla wrote:i think it works like, when you launch, the controller precicely misfires at certian points to control wheel spin,
This is very effective on forced induction because the missfire causes a change of heat and pressure differential across exhaust turbine, and therefore turbo spools up FASTER.


Dont mix up traction control and launch control as they are different.

Launch control is just a clutch activated rev limiter that can be adjusted.

Traction control requires wheel speed sensors and launch control does not.


Traction control is like opposite to ABS. yes it has wheel sensors but when it senses one wheel loosing traction, it slightly applyes BRAKES on affected driving wheels. no misfiring.
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Postby MrBob » Sat Aug 14, 2004 9:09 am

matt dunn wrote:
kingcorolla wrote:i think it works like, when you launch, the controller precicely misfires at certian points to control wheel spin,
This is very effective on forced induction because the missfire causes a change of heat and pressure differential across exhaust turbine, and therefore turbo spools up FASTER.


Dont mix up traction control and launch control as they are different.

Launch control is just a clutch activated rev limiter that can be adjusted.

Traction control requires wheel speed sensors and launch control does not.


hes mixing up launch control with anti-lag. Launch control doesnt assist in spool-up. Its just a very accurate way of finding the precise amount of revs to clutch-dump at. Some launch control units use wheel speed as an indicator to disengage, also seen one hooked up to a handbrake.
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Postby RedMist » Sat Aug 14, 2004 9:16 am

There are two different forms of launch control.
One is called two step. Where you step on both the accelerator and the clutch in order to enable it. It sets the engine RPM to a specific limit that has been predetermined (by you) for launch. Once you release the clutch the launch control counts a second or so then disables.
The second is the more professional approach. It uses wheel speed sensors in order to determine slip. You set your launch RPM much as above however when you disengage the clutch the controller doesn't just count, it checks slip between the front and rear wheels and introduces a missfire. Once the slip gets to an acceptable limit it disables and allows you to rev through to your standard RPM limiter.
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Postby Fred » Sat Aug 14, 2004 7:00 pm

Cheers redmist that makes sense. so pretty much if ur a half decent driver and can control ur revs and wheel spin u wont b much better off with launch control only a fraction. b 100 times better just to hve a lsd
White Trueno ae92, 4agte
172kw atw and as bazda put it "lowest reading dyno in auckland"
http://toyspeed.blakjak.net/profiles/profile.php?id=672
http://www.cardomain.com/ride/2124212/1

Black and Gold Trueno ae92, 4agze
14.6@152 (hmmm thats a .69)
http://www.cardomain.com/ride/2160441
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Postby Andy from the block » Sat Aug 14, 2004 7:04 pm

Bazda wrote:
Adydas wrote:look dont make me hit you to together..

2 penisis touching like thats just ghey

YUCK 8O


Are you gay?
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