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Old 07-29-2002, 01:09 AM   #1
AzNStiImpreza
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Default Difference between Slipping and Dropping Clutch during launch

I just finished reading the "how to launch an MT WRX". there were a lot of talk about slipping and dropping clutch. rightnow, i am very confused. When i launch, i keep the clutch at the point right before the car starts moving (inching foward). i keep steady around 4k rpm, and then floor the gas and let go of clutch almost at the same time. (i probably press the pedal a little before releasing the clutch.) I dunno if that is Dropping or Slipping. can somebody please give me clear-cut explanation of wut slipping and dropping of clutch is?
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Old 07-29-2002, 01:13 AM   #2
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Default Re: Difference between Slipping and Dropping Clutch during launch

Quote:
Originally posted by AzNStiImpreza
I just finished reading the "how to launch an MT WRX". there were a lot of talk about slipping and dropping clutch. rightnow, i am very confused. When i launch, i keep the clutch at the point right before the car starts moving (inching foward). i keep steady around 4k rpm, and then floor the gas and let go of clutch almost at the same time. (i probably press the pedal a little before releasing the clutch.) I dunno if that is Dropping or Slipping. can somebody please give me clear-cut explanation of wut slipping and dropping of clutch is?
If you are letting go of the clutch completely (ie in a split second) with the rev's at 4k then you are 'dropping' the clutch. This on a continual basis is bad unless you have a dogbox.

If you let the clutch slowly out whilst taking off you are 'slipping'.

Slipping is less stressful on transmission but burns out the clutch after repeated attempts....
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Old 07-29-2002, 01:25 AM   #3
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Default hmmm

ok, i think im doing more of a drop. but, which is overall better for launch? the way i do it, the rpm goes down to 3500 when my car takes off. i think dropping the clutch is better for overall launch. im thinking about not doing it anymore cuz it seems bad for the tranny as described.
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Old 07-29-2002, 08:33 AM   #4
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Default Re: hmmm

Quote:
Originally posted by AzNStiImpreza
which is overall better for launch?
Dropping is faster. Slipping is likely to be less expensive as clutches are less expensive than transmissions.
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Old 07-29-2002, 01:49 PM   #5
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If your boggin down to 3500 then your not launching good...I keep the rpms at like 5500, then about 50% of clutch is slipped and as its slipping i hit 100% throttle, then letting the rest of the clutch go....I bog down to ~4500 (give or take a few hundred rpms) which is in a good sweet spot for the turbo.....
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Old 07-29-2002, 09:26 PM   #6
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Default hmmm

i dunt have turbo....sniff*
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Old 07-31-2002, 01:13 PM   #7
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You can also tell when you drop the clutch there will be a loud bang of the tranny and driveline shifting around in their mounts. Although that seems to go away after awhile.
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Old 08-04-2002, 10:55 PM   #8
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Quote:
I dunno if that is Dropping or Slipping. can somebody please give me clear-cut explanation of wut slipping and dropping of clutch is?
For a WRX, you are slipping when you smell the clutch burning, you are dropping when you get the tires to burn, you are bogging if nothing burns.

When I had an RS, the higher gear ratios and instant torque meant that with your type of launch, you get a pretty good shot out of the hole. You might do a bit better to let the clutch out more smoothly (slipping) so that the revs never drop below 4500-5000.

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Old 08-04-2002, 10:59 PM   #9
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The diffrence is:
Burning clutch or breaking gears... IMO.


-Neal (automatik owner)
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Old 08-05-2002, 11:02 AM   #10
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everything seems to make sense now. im going to slip from now on. but, the feeling of all that wasted cltuch.... then again, the feeling of a messe dup tranny....
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Old 08-05-2002, 02:17 PM   #11
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Quote:
Originally posted by midlifecrisis
For a WRX, you are slipping when you smell the clutch burning, you are dropping when you get the tires to burn, you are bogging if nothing burns.
that's a pretty good rule for a stock wrx. i have a stage 0 kit on my car and my wheels spin and i smell the clutch burning if i launch hard...so i don't launch hard unless i have to.

but yeah, don't just dump the clutch. if anything, slip the clutch and get a higher performance clutch when it wears down. the best rule: compromise. don't go crazy or you will pay for it later.
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Old 08-05-2002, 08:52 PM   #12
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I think he is doing more of a slip/dump type launch. I use this method and got 1.8 60' stock. Is it harder on the driveline than slipping? yes. Is it easier on the clutch than a full out slip to 5k? yes. I don't do this all the time but at the track its a must for a good 60'. On the street I do a slight-slip at about 3k. The worst thing is to side-step the clutch. Thats just flicking you foot off the pedal as fast as you can. My launch is more like, a littile slip to get moving then picking your foot up off the ground just after you have stepped on some gum at about 4500 rpm. lol (closest thing I could think of to the motion). Try it sometime.. I don't get any clunks. Takes a little practice to keep it smooth. I just get a small chirp out of the wheels than bam off like a rocket... It feels good to me...


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Old 08-05-2002, 08:58 PM   #13
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this is what I gotta say. You need slip somewhere in your system. Be it via clutch, 1st gear or wheels. you decide what is the cheapest.

btw, wheels is not an option in high tractions situations

IMO, slip the clutch as much as you can and do it with some quickness. You will burn your clutch but a clutch is a cheap replacement in comparison to gears. I have seen 1 to many clutch drops to let people say it is ok.


it is way to much of a shock to the system.

I was a former foxbody owner. I know from experence. you need somewhere to slip. I chose tires on my RWD car. Well that worked out real well till about 500 hp and when slicks were used. Because I didn't slip and I broke my rear end. Fortunally working at a dealership fixed that problem. But it isn't so easy with a subaru. IMO the clutch is your best bet on cheapest to replace if your going to drive hard.

-Neal
Automatic owner...
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Old 08-05-2002, 09:38 PM   #14
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As far as I know the dog teeth on a dog box are only relevant for matching the selector to the gear instead of syncros. So, saying you have a dog box isn't going to help much in this situation. That being said, most (if not all) dog boxs use straight cut gears vs. helically cut gears. Straight cuts gears are a lot louder and a lot stronger. Great for the track and impractical for the street.

Nick is correct, something needs to give and correctly points out that there is a trade off for each component. For example, one of my friends had an Audi A4 2.8 quattro. There's no way that car could break the tires loose and the transmission was very strong. In the end it was either bog or burn for him even when he side-stepped the clutch.

The WRX transmission is fairly weak. I believe it's not rated for more than 250 lbft of torque. Frankly, I don't believe a stock WRX can break the tires loose. It might chirp for a second, but that's hardly what I call 'breaking loose'. Personally, I'd go easy on the tranny and let the clutch slip a bit to keep the engine rpms inside the turbos spin up range.

If you're serious about racing your vehicle, you should consider upgrading various components.
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