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2 Step Launch Control

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Old Jun 29, 2009 | 12:54 AM
  #1  
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From: Chi-Town
2 Step Launch Control

I had my car dynoflashed 2 years ago and still yet to be tuned again...i had the 2 step set before at 5000rpm i believe and i haven't used it in a long time...and today i was testing it out and noticed its at 6000rpm now... did i just lose my 2 step or somehow it got raised?
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Old Jun 29, 2009 | 05:22 AM
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From: somewhere testing various tires, brakes, and suspensions.
Its coded into the ECU. You might have just forgotten where it was set.
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Old Jun 29, 2009 | 05:23 AM
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From: Austin, TX
I don't see how it could have been different on the same tune, but a lot of times tuners will adjust it.
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Old Jun 29, 2009 | 05:26 AM
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From: RENO
They usUally adjust it upon customers request.
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Old Jun 29, 2009 | 02:10 PM
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From: NYC
same happened to me. during tune, the tuner also raised my 2step to 6k rpm up from the factory ~5000rpm. he said i would get a better launch...

however, if i use the 2step (rather than slip/dump the clutch at ~5000rpm on my own), my ET is actually slower. meaning with the 2step its worse.
now that the 2step is at 6k rpm, i hit redline sooner, so i have to shift sooner, hence i reach 60 in 3rd rather than 2nd gear, and reach the 1/4mile in 4th, rather than 3rd ... that extra shift raised my ET from 12.7 to 13.0 (all else being equal), and 60 comes in 4.4 rather than 4.1

so in fact, im always better off using my own method, just slip the clutch a little, let it grab just a little, and then raise the rpm to ~5000 or even less, and dump it... get the fastest times that way. as i said, much faster than using the 2step
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Old Jun 29, 2009 | 02:18 PM
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From: LI
Your better off launching at the 6k as long as you preload the drivetrain. I have had great success, the tires spin just enough to keep the RPMs up and not bog out the turbo. I am also using the stock clutch and tuned at around 400hp @ 26psi. 35k strong and going!!! i found the 5k 2step to not be as effective at the 6k launch
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Old Jun 29, 2009 | 03:55 PM
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From: Maryland
6k is where you want it, just learn to launch so you dont kill the clutch. 6k will do more damage then launching at 5k
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Old Jun 29, 2009 | 04:47 PM
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From: New York
6000rpm is on the money
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Old Jun 29, 2009 | 04:50 PM
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From: NYC
i have the exedy twin, so im not worried... however, once again, at 6000rpm, u r way sloser to redline (albeit a raised redline to 7800), so that means u have to shift much sooner that u would had the 2step remained at 5000rpm... so, once again, i have to shift twice by 60, and three times by the 1/4mile!!!
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Old Jun 29, 2009 | 04:59 PM
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From: Maryland
dont think just because you have an excedy twin disk you can slip the crap outta the clutch and not know how to launch and you will be fine. also you come off the clutch to hard, you can break some very expensive stuff. ive seen people burn out excedy twin disks like they were stockers...
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Old Jun 29, 2009 | 07:47 PM
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From: Branford, CT
6K sounds about right...
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Old Jun 29, 2009 | 07:52 PM
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From: Spokane, WA
Try 6K with anti-lag tuned into your map. I leave on 12lbs at 6k and it hooks hard with no bog.
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Old Jun 29, 2009 | 08:25 PM
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From: NYC
i think u guys are missing the point im trying to make.

forget the hookup, forget the initial grab.... its a whole lot simpler. again - once the clutch hooks up and u already launch, u r already past 6k rpm, which means u hit redline and have to shift almost instantly into 2nd, hence by 60, u have to shift again, into 3rd, and by the 1/4, im in 4th (in fact im at redline in 4th... almost into 5th)

even if u get the most perfect hook up and launch in the world, its the extra shifting that kills the time !!!! hence if i launch at 5k rpm, i get to shift less, and i get faster times!!!!
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Old Jun 29, 2009 | 09:44 PM
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do u have to have a tuner set it at a certain rpm or does it come stock at 6k? just curious b/c i was trying to see if my car has it but no luck.
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Old Jun 29, 2009 | 09:49 PM
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From: NYC
as mentioned several times above, it comes at ~5k from the factory... tuners raise it higher
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