Bottoming out when launching hard
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This is a discussion on Bottoming out when launching hard within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Hello all, just wanted to see if this is a common issue, and what the solution most likely will be. ...

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    Registered User Mustacheride's Avatar
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    Bottoming out when launching hard

    Hello all, just wanted to see if this is a common issue, and what the solution most likely will be. If I dump the clutch in first while I'm hammering the gas, the rear end suspension bottoms out (hard). I obviously haven't been doing this any more after it happened the first couple times. I'm guessing that I need to replace the struts, but any advise would be much appreciated.

    I have an '04 WRX sedan. The car is bone stock (for now) with 82k miles.

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    He simply abides. SD_GR's Avatar
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    The rear suspension should have over 15 cm of travel. It is more likely you are hearing a loud "THUNK" as the driveline slops, especially if you inspect the struts and find nothing physically wrong with them.
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    Registered User 06scoobyrex's Avatar
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    Registered User Mustacheride's Avatar
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    Is there a way to eliminate the driveline slop, or is this just something every AWD, manual transmission car has? Also, is there a technique I can use where the driveline won't "thunk?" Thanks for the reply.

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    Registered User Pylonpounder's Avatar
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    My advice is do not dump the clutch in first gear. Or at all with a stock WRX. Or modded, for that matter, unless you've put a LOT of money into the driveline. Tranny- Doesn't like that treatment. Clutch- REALLY doesn't like that treatment. Rear driveshaft- you guessed it...doesn't like that treatment. Rear axles/diff- Still, again, don't like it. From anything I've heard, doing that kind of stunt repeatedly is a good way to end up with grenaded transmissions, dead clutches, and twisted/snapped driveshafts and axles... the WRX may be beefier than a standard impreza, but while its a rally-based car...it's certainly no rally car. The stock parts won't last very long with that kind of power being suddenly introduced to them. I agree with the driveline slop- and the way to fix it is to take off gently, THEN stop on the gas once the clutch has been fully released. There's a thread on here somewhere about proper launching technique but to be honest, I'd stick to gentle starts. Good luck with your scoob, and welcome to the forums. : )

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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Quote Originally Posted by Pylonpounder View Post
    My advice is do not dump the clutch in first gear. Or at all with a stock WRX. Or modded, for that matter, unless you've put a LOT of money into the driveline. Tranny- Doesn't like that treatment. Clutch- REALLY doesn't like that treatment. Rear driveshaft- you guessed it...doesn't like that treatment. Rear axles/diff- Still, again, don't like it. From anything I've heard, doing that kind of stunt repeatedly is a good way to end up with grenaded transmissions, dead clutches, and twisted/snapped driveshafts and axles... the WRX may be beefier than a standard impreza, but while its a rally-based car...it's certainly no rally car. The stock parts won't last very long with that kind of power being suddenly introduced to them. I agree with the driveline slop- and the way to fix it is to take off gently, THEN stop on the gas once the clutch has been fully released. There's a thread on here somewhere about proper launching technique but to be honest, I'd stick to gentle starts. Good luck with your scoob, and welcome to the forums. : )
    Trans will be the first thing to go. Don't do clutch dumps...if you're trying to spin the tires (which you wont do in a stock WRX) rev to 5500-6k and then float the clutch slowly out until you start moving forward a tiny bit...then dump it the rest of the way. Look at my mod lists. I'm pushing about 300% of your power AND I have PPGs to beat on...I can't even chirp the tires by dumping the clutch from a dead stop.
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    He simply abides. SD_GR's Avatar
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    There are various kits available, usually a few bolts and bushings. They deal with the rear chassis and the potential for movement at the differential.
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    Registered User Mustacheride's Avatar
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    Thanks for the info everyone

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    Registered User Pylonpounder's Avatar
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    Quote Originally Posted by Drews View Post
    Trans will be the first thing to go. Don't do clutch dumps...if you're trying to spin the tires (which you wont do in a stock WRX) rev to 5500-6k and then float the clutch slowly out until you start moving forward a tiny bit...then dump it the rest of the way. Look at my mod lists. I'm pushing about 300% of your power AND I have PPGs to beat on...I can't even chirp the tires by dumping the clutch from a dead stop.
    Hmmm. I would never try to launch my wrx that way, I like it too much. But, I did (silly me) let a friend drive it once and he chirped all four tires from a stop without revving very high... And I've had all four tires step out on me while in the process of emergency evasive action. Taking a left from a stop, up a hill, 25 MPH zone- no one in sight, though theres a blind corner about 150 yards from the stop sign. come out a lil and someone flies around that corner coming down the hill closer to 50 than 25....stepped on it in first and the whole thing kicked sideways, tires spun like crazy, tire smoke everywhere...but it certainly won't do that everyday, must have been something slick on the road there i think, despite it being 75 and sunny. I have a hybrid motor with a td04..but the extra torque from a hybrid still shouldn't make my tires spin more easily than your worked STi...

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    Noodles Aren't My Concern twistedphrame's Avatar
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    It may have been that you were turning (I assume it was a hard left?) the car should be resistant to moving forward so it pushed forward and started spinning around with the front wheels as a pivot.

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    UnBanned Sinister's Avatar
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    it also depends on tires.
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    Registered User poly_poly-man's Avatar
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    hehe... I've lit up all 4 before on a clutch dump...

    ...in 4 inches of snow.

    Seriously, don't do it. It's not even the fastest way to go - you basically want to keep your revs to about 4-5k, slowly let out the clutch never letting it get too much below that - in essence turning the clutch into a quickly burning CVT. It's one hell of a lot cheaper to replace a clutch than to replace a transmission or rear diff.

    To get rid of all that slop (but you have to promise not to clutch dump anymore), just do bushings. I'd suggest picking up unabomber's sexy rearend from Turn In Concepts, and you'll be very happy.

    But again, don't clutch dump unless you have a ton of money, and even then it's not the fastest way to go.
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    Registered User Pylonpounder's Avatar
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    Mmm, the turn is what i was thinking. Also, it's at a slant to the left. I did have semi-slick track tires on at the time, so that may have helped a little. Though they should have more grip on pavement, I think. Tires definitely aren't my specialty. Sorry for that little thread hijack >.>

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    Would Never, Ever Say Something Bad About an Admin's Mom SonicWagon's Avatar
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    Launching "hard" often costs between 4 and 6 Thousand dollars. Once you break the transmission it will be realized how foolIsh it was.

    The noise your hearing is the violent transfer of power caused by dumping the clutch.
    Last edited by SonicWagon; 04-09-2011 at 05:55 AM.
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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Quote Originally Posted by Pylonpounder View Post
    Hmmm. I would never try to launch my wrx that way, I like it too much. But, I did (silly me) let a friend drive it once and he chirped all four tires from a stop without revving very high... And I've had all four tires step out on me while in the process of emergency evasive action. Taking a left from a stop, up a hill, 25 MPH zone- no one in sight, though theres a blind corner about 150 yards from the stop sign. come out a lil and someone flies around that corner coming down the hill closer to 50 than 25....stepped on it in first and the whole thing kicked sideways, tires spun like crazy, tire smoke everywhere...but it certainly won't do that everyday, must have been something slick on the road there i think, despite it being 75 and sunny. I have a hybrid motor with a td04..but the extra torque from a hybrid still shouldn't make my tires spin more easily than your worked STi...
    Why not? If burnouts are your goal this is going to be your best option while reducing snapping your driveline into pixie dust. I've broken loose all four through a turn. That's not hard to do.
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