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Old 07-22-2002, 05:06 PM   #1
WhiteLightning
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Question How to launch an MT WRX?

I ask this question coming from a 95 GSX with an aftermarket clutch that was easy to launch...rev and drop...But the WRX is new so I figured I'd ask before breaking something....so whats the proper method to get that 5.8 0-60mph and the 14.3 1/4et?

tia

Nik
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Old 07-22-2002, 07:38 PM   #2
THEMAN
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Bring the rpm's to 4.5k and let the clutch out really slow untill you feel the friction point. Then dump the clutch and floor it. You can even bring the rpm's to 5k for an even faster launch. You should get a turbo timer to find out what you are really running 0-60 in, because I went 5.6 in my car with only a BOV.
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Old 07-23-2002, 12:46 AM   #3
WhiteLightning
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Wink

Thaaank you...this info was most helpful.


Nik
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Old 07-23-2002, 06:32 PM   #4
TurboWRXImpreza
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IMO, you should never dump the clutch. I'm sorry to say that I found out the hard way. I'm already on my 2nd tranny. I dumped the clutch too much.

Slipping the clutch IMO, is better because at the same time it allows you build boost and you reach full boost much faster than dropping it....that is...if you do it right.


PRACTICE



Raymond
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Old 07-24-2002, 09:02 PM   #5
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I've always cringed when people said "dump" the clutch. To me that means side-step the pedal and MAN does that put a lot of STRAIN on the drivetrain. I've had many hundreds of launches in my 92 and 97GSX's without any tranny problems, but I quickly slip the clutch. My WRX is a little new for launches (300 miles), but when I do, I'm slippin'.

I'm surprised no one else asked this of "THEMAN"
Quote:
You should get a turbo timer to find out what you are really running 0-60 in...
There's a turbo timer that measures 0-60MPH times? My HKS turbo timer (97GSX) only let's the engine run for a set period of time after the ignition is shut-off. Sorry, just sounded kind of funny.
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Old 07-24-2002, 11:30 PM   #6
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I pull consistent 1.9 60' times with a 5800ish RPM cluch drop at the track. No burnt clutch smell!

Jay
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Old 07-25-2002, 02:53 AM   #7
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the HKS type 1 TT will do 1/4 mile times
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Old 07-25-2002, 06:52 AM   #8
Ian02WRX
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Damn, I stand corrected, found this on the Internet: "Blitz Multi Speed Turbo Timer, which is an advanced version of the FATT, which includes features such as 0 to 60 timing and quarter mile". Crazy convergence. Still sounds funny, kind of like "I'm going to turn on my TV and do my taxes..." which I suppose you could do with WebTV or something.

And 5800 RPM clutch drops, ouch! At the Diamond Star Shootout (DSM's--Eclipse/Talon Drag Racing event) a couple years ago, there were some really fast 3000GT's and I could here them on a stutter box (bababababababa) at the line and later asked someone if the guy had a modified ECU (like www.tmo.com). His friend said he was bouncing off the 7000RPM rev limiter at the line! Pulling low 1.6 60' times...but I later saw him at the Econolodge with a hole in his tranny...

Clutch drops still make me quiver. In five years of owning DSM's and being around them I've learned that something has to give, either the clutch slips or the tires spin. At my local tracks, between the traction compound they spray and the cars with slicks leaving rubber on the launch pad, it always takes some work to spin the tires, even in low 12 second DSM's. My opinion is still that it's safer to slip the clutch a little as it is released, rather than side-stepping it. I pull low 1.7 and an occassional 1.6 60' time with an ACT2600 and still have 35k miles and over 200 launches on that clutch.
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Old 07-25-2002, 11:41 AM   #9
n20x3whitewrx
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Quote:
Originally posted by Diversion
I pull consistent 1.9 60' times with a 5800ish RPM cluch drop at the track. No burnt clutch smell!

Jay
not bad i also found that method to work i have very few mods and i slip the clutch @5200 rpms and reach a1.766 60 ft and get a 13.0 @ 101mph. but when going trhu the traps i smell clutch. but better the clutch than trans............
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Old 07-25-2002, 11:54 AM   #10
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I think that some people might be misunderstanding the slip and dump description. It's not a dump per se, but more of a slip, then once you get rolling, dump (very quick slip) while simultaneously flooring the gas. It takes some practice to get good at it, but I think that everyone agrees that it's the safest way to get a good launch.

I use this method and now I consistently manage to get low 1.8s.
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Old 07-25-2002, 10:54 PM   #11
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ok i am going to try to get this straight. You rev it to 4.5 then slowly take down the clutch until you feel the friction point. Then you take it out smoothly while giving it plenty of gas. sometimes i drive and i can feel the car pull harder when the clutch is not all the way down like when taking off it just pulls.
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Old 07-26-2002, 05:26 PM   #12
Ian02WRX
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At this point, it reads like everyone is talking about the same thing, just describing it differently. To me, you want to let it slip a little (so you don't grenade your tranny) then let it out the rest of the way quickly (so that you don't fill your car with burned clutch stench).

I have a video on my website that lets you hear the launch and you can kind of tell it's a slip and not a total dump--more gradual, less bang. http://www.gotboost.org/My97GSX.htm

-Ian
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