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Old 03-07-2013, 12:54 AM   #1
wrxFTWdey
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Default Launch Control question

recently purchased a Cobb AP for my 2011 wrx and just got it in the mail today, so i flashed and setup launch control at 4700. I would always just blip the throttle right around 5000-5500 and would just dump the clutch when i would launch, i wouldn't bog because enough power was being made, but i decided to go easier on my drivetrain and begin slipping the clutch. The way i slip the clutch, is by releasing the clutch pedal to right before engaging point and right when i would feel the car wanting to move forward i would rev it and launch. if i released the clutch to near midpoint, would the ecu allow me to use Launch Control? or would i have to rev it manually? I don't want to try it and let it rev to 7500 like when i didn't set up launch control properly I just need to be easier on the drivetrain and that is like the easiest way to learn to slip the clutch on a launch without burning it a bunch of times. lol
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Old 03-07-2013, 01:24 AM   #2
jebjkey
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I believe that LC uses the clutch switch (clutch peddal fully pushed in) in combination with the speed sensor (<2.5mph) to enable the secondary rev limit. If your launching technique puts the clutch somewhere in the middle for a significant time prior to engaging the clutch, then I would guess that you will have problems with LC.

My recommendation is to try it once using the clutch your way but WOT the entire time and see what happens. Be ready to get off the gas if your clutch method does not work with LC since you will transition to the normal rev limiter and you probalby do not want that. Unfortunately, launching takes some practice.
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Old 03-07-2013, 09:42 AM   #3
Cobb Tuning
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Quote:
Originally Posted by wrxFTWdey View Post
recently purchased a Cobb AP for my 2011 wrx and just got it in the mail today, so i flashed and setup launch control at 4700. I would always just blip the throttle right around 5000-5500 and would just dump the clutch when i would launch, i wouldn't bog because enough power was being made, but i decided to go easier on my drivetrain and begin slipping the clutch. The way i slip the clutch, is by releasing the clutch pedal to right before engaging point and right when i would feel the car wanting to move forward i would rev it and launch. if i released the clutch to near midpoint, would the ecu allow me to use Launch Control? or would i have to rev it manually? I don't want to try it and let it rev to 7500 like when i didn't set up launch control properly I just need to be easier on the drivetrain and that is like the easiest way to learn to slip the clutch on a launch without burning it a bunch of times. lol
Our launch control for the 2.5L cars requires the clutch pedal to be depressed in order for it be active. This is monitored via the clutch switch - the clutch pedal does not have to be all the way to the floor in order the switch to be tripped. You can put the "Clutch Switch" monitor up on the Accessport using the live data function and play with the clutch to see where the trip point is and therefore get an idea of well that works with your launch technique.

Bill
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Old 03-07-2013, 12:44 PM   #4
wrxFTWdey
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thanks a lot bill, i'll try it out when i'm out of class. it's just my method of launching to avoid both, dumping the clutch and burning the clutch. i've dumped it enough times... got good launches tho
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Old 03-08-2013, 03:30 AM   #5
bacalhau16
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Look into and learn what pre-loading your drivetrain is. You dont want to just dump the clutch and shock the drivetrain. You do have the right idea about slipping the clutch a bit, but with anymore mods, you will quickly go through your clutch. When launching, once the clutch has grabbed, put the gas to the floor. If youre not WOT soon enough, you will bog.
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Old 03-08-2013, 12:47 PM   #6
wrxFTWdey
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I'm waiting to experiment, but there has been a storm and it's been raining quite a bit. but at least i can have fun on slippery roads until then
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