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04-22-2013, 12:50 AM | #1 |
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Drag launch w/ DCT questions
Ok, first and foremost, i spent a little time searching, but I have found multiple conflicting answers, So i figured I would start a thread on this.
The car is going in for an ESS 625 next week, and the next Wednesday i plan on taking her to a test and tune night at the drag strip. My question is in reference to the DCT and launching the car. I know there are 2 ways to launch, first being the actual launch control, 2nd being "poor mans" launch control where you just mat it from a dig and the engine automatically revs to 3500ish and then engages one of the clutches. My question in reference to the above, is which mode is "safer" on the DCT its self. I have heard mixed feedback, saying that true LC is more wear and tear. Then I have heard that using the poor man method will destroy your 1/3/5/7 clutch in no time where as the standard mode is safer and recommended to use. Any useful, proven feedback would be GREATLY appreciated, thanks ahead of time.
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04-22-2013, 05:11 AM | #2 |
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All I know is that I went on stock tyres with no supercharger and using Launch Control was useless, would spin on the spot, would be great if you could lower the revs more. When just flooring it off the line, 60ft times were very average (2.0XX) but way better than launch control. Next time I go I will have a VF620 installed and 305/30/19 RE-11's so hoping for some traction, but feel drag radials will be needed
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04-24-2013, 06:12 PM | #4 |
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Poor man's method (or otherwise termed "putting your foot through the floorboard") is very hard on the DCT. It is very effective in achieving top acceleration results for a stock M3 though. Slipping the clutch through launch control is much easier on the DCT.
With a S/C, the dynamics obviously change where traction becomes more difficult to achieve. Are you running street tires or DRs?
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04-24-2013, 06:56 PM | #5 |
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Launch control will destroy your clutch. Mash and go will destroy your transmission. Pick your poison.
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04-25-2013, 05:47 AM | #6 | |
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from akh23456 "From my experience i did the "poor mans" launch a lot and barely used LC because of the stress is cause(5 times max).I actually broke the record for fastest ET doing the "poor mans" launch but it got broken by VAC later. I had over 300+ times at the 1/4 mile with my M when i had it. I recently sold it but my DCT felt the same from the day i bought it." from LostMarine "i know who is claiming what on LC and poor mans LC.. The same people have no experience other than this car, and have been seen doing things that should have blown the car up while at the track. oddly, they made it home, but not much longer all things equal, poormans LC will be less stressful on clutches, but possibly more stressful on other internals. imprtant because noone has had to replace anything besides clutches. the other question, is if it is more useful to do poor mans LC and real LC. Currently, LC has shown better results for me, but thats because of tires used.. ill be testing this theory again shortly with even variables" from Sticky "Launch control is far more wear and tear. I used the clutches up in 10k miles due to it." So it looks like once again im getting conflicting answers. They are saying over there that poor mans is less wear and tear compared to using factory LC.
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-08 E92 Brushed Steel DCT- KW V3's - AR Design - Volk TE37 - Vorsteiner - ESS/AR 700 -2012 GTR Premium- Jacks 3.8 - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - DPE ST7's - Ecutek via Visconti - 9.4 @150mph 7200ft DA - 185.5mph 1/2 mile 9240ft DA |
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04-25-2013, 12:43 PM | #7 | |
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From what I remember, on a stock car, it seemed like either method would be ok for the car (not good but not something that would kill the DCT either); but once you increase torque levels substantially with the S/C, there is a lot more torque and therefore more load on the clutches...so either method is giong to be a lot harder and cause more wear. And again from what I remember, using LC was easier on the clutches vs the poor man's method with increased torque levels as LC allowed for a progressive "slipping" (i.e. less torque load) vs the entire torque onset from poor man's method. All of this is assuming DR's...as with street tires you are just going to spin anyway and that's not really hard on the DCT since the energy is being expended.
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04-26-2013, 10:10 PM | #8 |
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If your car is properly setup with drag radials and linelock, your clutch and rear will be fine using launch control. I have hundreds of launches! Using the poor mans method, you can destroy your clutch and rear in one day!!! Anyone with a supercharger running the 1/4 mile not on drag radials....your waisting your time and risking your life !
Btw- all you guys doing burnouts with street tires at the strip, your waisting your rubber! The car won't hook any better as your tires are too stiff, sidewalls are too short and the compound is too hard. |
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04-27-2013, 01:48 AM | #9 | |
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-08 E92 Brushed Steel DCT- KW V3's - AR Design - Volk TE37 - Vorsteiner - ESS/AR 700 -2012 GTR Premium- Jacks 3.8 - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - DPE ST7's - Ecutek via Visconti - 9.4 @150mph 7200ft DA - 185.5mph 1/2 mile 9240ft DA |
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05-01-2013, 12:58 PM | #11 |
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11-20-2013, 10:34 PM | #13 |
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With stock tires it's a no win situation on the drag strip with a SC. I was all over the place trying to launch and go down the track with my 275 PSS tires. You need drag radials to have a chance at a proper launch. I trapped at 120mph and ran a 12.2 with a 2.2 60ft time and spinning through the first three gears.
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02-06-2014, 02:37 PM | #14 |
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I have a supercharged c6 vette that I take to the strip regularly, I am actually looking for a supercharged m3 right now so this thread is useful. It seems like some of you guys using launch control have the rpm's too high on the pre load and are blowing the tires off. When my car was stock and on street tires I put the car in manual shift mode and pre loaded to about 1500rpms and launched it that way. I'm wondering if this is an option on the m3's? Seems like that would eliminate some wheel spin.
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05-30-2014, 10:39 PM | #15 | ||
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Works good , i get no spin my cars NA with a few mods and i go 1.85 60 ft 7.9=1/8 89.3mph 12.20@113.7
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