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Old 01-30-2011, 05:01 PM   #1
xabre1200
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Default What does slipping the clutch mean and why is it bad?

What does "slipping" the clutch refer to and why is it bad for your clutch? The comments on this video say this guy is slipping the clutch, is it just letting the clutch out too slow when shifting hard?

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Old 01-30-2011, 05:04 PM   #2
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It is bad for it in the sense that it makes it wear out faster.
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Old 01-30-2011, 05:15 PM   #3
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Yes - it means letting it out too slow or only letting it out part way. It means the clutch plates are rubbing against each other and are wearing quicker.
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Old 01-30-2011, 05:47 PM   #4
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subarus need to be driven a bit differently than 2wd cars.....if you shift fast and dont slip the clutch.....and the wheels dont spin....guess what????

you blow the gear in the trans

it takes a good bit of finesse to drive a subaru without blowing the trans or wearing out the clutch


and the proof of this is in all the busted 5mt's and guys burning the factory clutch up in 30k or less miles


and then ya have the guys that get 120k+ outa the stock clutch--autoxing the car at stage 2+ every weekend and driving the car like they stole it...and never blow the trans


so....if ya dont spin the wheels or dont slip the clutch...ya blow the trans

the finesse is getting the proper mix...and that is where the kiddies screw the p00ch
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Old 01-30-2011, 10:01 PM   #5
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Quote:
Originally Posted by Uncle Scotty View Post
subarus need to be driven a bit differently than 2wd cars.....if you shift fast and dont slip the clutch.....and the wheels dont spin....guess what????

you blow the gear in the trans

it takes a good bit of finesse to drive a subaru without blowing the trans or wearing out the clutch


and the proof of this is in all the busted 5mt's and guys burning the factory clutch up in 30k or less miles


and then ya have the guys that get 120k+ outa the stock clutch--autoxing the car at stage 2+ every weekend and driving the car like they stole it...and never blow the trans


so....if ya dont spin the wheels or dont slip the clutch...ya blow the trans

the finesse is getting the proper mix...and that is where the kiddies screw the p00ch
Any tips on how you achieve this? Slip the clutch faster when you are driving aggressively?
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Old 01-30-2011, 10:45 PM   #6
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There's a difference between slipping your clutch and a slipping clutch.

A slipping clutch is a worn clutch in which your RPMs will jump/rise like your revving in neutral and your car won't accelerate at the same rate of RPM acceleration.

Slipping your clutch is, like what Uncle Scotty said, properly shifting your AWD car when shifting aggresively/launching (as opposed to "dumping" your clutch) so you don't pop your transmission.

Tips: Practice.
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Old 01-30-2011, 10:49 PM   #7
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Quote:
Originally Posted by xabre1200 View Post
Any tips on how you achieve this? Slip the clutch faster when you are driving aggressively?
its a feel thing after you understand how the system mechanically works its all about understanding whats going on when your driving the car. and that takes lots of practice which is why scottie said "and that is where the kiddies screw the p00ch". i always think its funny when some new 16 year old kid comes to the track and thinks that hes going to beat that old man in his miata around the track. Now im only 18 but i know how the game goes
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Old 01-30-2011, 11:56 PM   #8
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i.e. riding your clutch
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Old 01-31-2011, 12:54 AM   #9
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Slipping the clutch may be bad for yur clutch but its better than blowing yur trans like mentioned above. Launching and shifting in an Awd is a bit diffrent than 2wd. It takes a little practice. If u smell clutch then u didnt let it out fast enough. If u feel a bang/jerk then u let it out too quick.
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Old 01-31-2011, 01:02 AM   #10
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Quote:
Originally Posted by jdmsilverbugeye View Post
If u feel a bang/jerk then u let it out too quick.
thats what she said
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Old 01-31-2011, 03:29 AM   #11
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^^ lol
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Old 01-31-2011, 07:38 AM   #12
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The video sounds like the clutch is slipping to me do to a bad clutch. Uncle Scotty hit the nail on the head. Another good point is a lot of guys will slip 1st when taking off from a dead start but slam 2nd. I have a 5 speed running 335/360 and it's the torque that's the reason I worry about launching to hard then slamming second. I've heard how second is the gear that will break with to much abuse. I wouldn't know how to slip second when your racing. I know how to launch from the line slipping the clutch but second I wouldn't have a clue how to slip.I don't speed shaft between gears just for the very reason I'm worried I'll break a gear. I slip first then let off just a little of gas between gears and make sure I have a good gear set before letting out the clutch. I know it takes a little more time but I'd rather take a little more time then pay for a rebuilt trans.
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Old 01-31-2011, 01:05 PM   #13
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Slipped the clutch this morning and spun all 4 without any burnt smell from the clutch. Guess ive been doing it right this whole time and didnt even know
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Old 01-31-2011, 08:56 PM   #14
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Sounds like it just be careful with 2nd gear or any of them with a missed shift.
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Old 02-01-2011, 12:11 AM   #15
775sti
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When he slips the clutch, he is letting it out slowly while giving it gas. In the end wearing it faster!
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Old 02-01-2011, 07:20 AM   #16
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Quote:
Originally Posted by 775sti View Post
When he slips the clutch, he is letting it out slowly while giving it gas. In the end wearing it faster!
If you slip the clutch correctly you won't wear it out faster. Slipping it to much then your "burning" it and yes it will wear it out quicker. Got to find that middle part.

Quote:
Originally Posted by pahaekachilles View Post
Slipped the clutch this morning and spun all 4 without any burnt smell from the clutch. Guess ive been doing it right this whole time and didnt even know
Just because it didn't have a burning smell doesn't mean you were doing it right. But on snow days like we have had if you shift quick(more than what you should) because the ground is slippery you will cause the tires to spin which again doesn't cause damage. However if you did it on warm tarmac might be a different story.

Quote:
Originally Posted by Uncle Scotty View Post
subarus need to be driven a bit differently than 2wd cars.....if you shift fast and dont slip the clutch.....and the wheels dont spin....guess what????

you blow the gear in the trans

it takes a good bit of finesse to drive a subaru without blowing the trans or wearing out the clutch


and the proof of this is in all the busted 5mt's and guys burning the factory clutch up in 30k or less miles


and then ya have the guys that get 120k+ outa the stock clutch--autoxing the car at stage 2+ every weekend and driving the car like they stole it...and never blow the trans


so....if ya dont spin the wheels or dont slip the clutch...ya blow the trans

the finesse is getting the proper mix...and that is where the kiddies screw the p00ch
+1 for Uncle Scotty. Man knows what he is talking about and couldn't have said it myself. When I did my 6spd swap my stock 5mt clutch looked brand new with 33k miles even with some autox days, "snow parking lot days", +stage2 power, etc. Again that is due to find that balance between spinning wheels, breaking tranny and burning the clutch for no reason. I will add to uncle scotty remarks a method to finding a good shift(think this goes for any vehicle but harder on subarus(actually awd in general)) Is when you shift you don't feel it at all. The car doesnt jerk the slightest bit. Its not easy and takes lots of practice and can be done at WOT or at grandma speed and anything inbetween.
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Old 02-01-2011, 09:43 AM   #17
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So how do you achieve a proper shift @ the dragstrip while going for the fastest time possible?

Lets say you are going down the track at WOT and you hit your target shift RPM. Does it go something like this?

- Let off throttle completely
- Mash clutch (fast as possible)
- Shift gear (fast as possible)
- Let off clutch, feather slightly throughout engagement point so as your clutch deliberately slips a little, allowing a smooth(er) transition to the next gear, while simultaneously giving it some gas
- After shift is completed, increase throttle to WOT (fast as possible)
- Repeat.
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Old 02-01-2011, 09:51 AM   #18
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If this is your first subby, maybe you should enjoy the car for a year or two before you start slipping clutches
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Old 02-02-2011, 02:20 PM   #19
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If it was me I'd do something like you described instead of not letting off the gas and slamming it in gear. As long as your on the track and your trying to set a constant time then there shouldn't be a problem letting off a little and making sure it's in the next gear good and tight. Of course everyone has there own opinion how to do it and I think it's good you are trying to ask the guys who do this everyday so to figure out the right way so you don't hurt your trans.The down side is if your running a 5 speed you are taking a chance of busting a gear anytime you do hole shots plus slamming into the next gear and the higher the TQ you have the more of a chance it could happen. This is my 2 cents not from someone who does it every day.
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