Anybody with an 04-05, this launch technique will not work unless you have removed your clutch slave cylinder delay.. if you have the delay in place, doing a 7K clutch dump will only result in a burned clutch. The delay was put in to prevent shock loads to the drivetrain at the expense of the friction disk and pressure plate. Smart of Honda since these are 'wear' items and not covered under warantee. (Unlike your tranny and diff.)

 

Damn corporate bastards!

 

Hmm...I did my first 6K or so clutch dump yesterday in my 05. Roads were wet. Lots of tire spin and then went like a bat out of hell. No burned clutch. No nasty smells.

 

try it with good rubber on dry pavement and you'll see what I mean

 

What exactly will happen if you try to launch a 04-05 at high RPMs?

 

The short answer is you will get lots of clutch slippage. The good news is it's pretty easy to fix. Here are the 2 "How To" threads from UTH

https://www.s2ki.com/forums/index.php?showtopic=270439

https://www.s2ki.com/forums/index.php?showtopic=275175

there a a bunch of other threads about this topic but 'search' isn't working right now.

 

i'm sorry captainmike, but i don't see what you mean.
i've dropped my clutch anywhere from 4-6k on my 05 with new tires and dry pavement... and get nothing but sweet wheel spin. no clutch burnage at all.

i understand the clutch delay MIGHT be a good upgrade for some folks (racers perhaps who really are bothered by the split second lag in response) but this delay has helped many average drivers from ruining their engine on miss shifts.

perhaps there are some other 04-05 owners that could weigh in?

 

what he means is that there is a "safety" baby-sitter type device installed that will prevent the tranny (diff and gears) from taking the brunt of the abuse. When you drop the clutch at high RPM's with no wheel spinning, if the clutch grabs right away, a HUGE shock is sent through the drivetrain....think hitting a big rock REALLY hard with a hammer at full swing. THe device on teh slave cylinder is intended to divert that "shock" away from the gears and differential and more onto the clutch, think swinging a hammer really hard and hitting a rock that is first covered in loose sand. The clutch aborbs some of the shock by not fully engaging immediately. I do not think the delay will kick in if there is wheelspin, because that will allow the shock to be diverted as well.....the tires will eventually pick up, but the shock will be dissipated by then.

This is kind of a screwed up way of saying that Honda probably had too many blown rear differentials (which are covered under warranty) as a result of this tranny shock, so they decided to throw this little device on to put the harm / damage onto the clutch friction disc (not covered under warranty). It is a way for them to save $ and screw people who like to drive hard.

John

 

theReverend, more power to you if it's not a problem for you, I know it was a problem for me and MANY other owners. I would get additional clutch slip PRIOR to achieving wheelspin on launch. This was particularly noticable at autocross for me. I think just about everyone who autocrossed or tracked a Pre 04 and then bought an 04-05 found this delay incredibly annoying. If it doesn't bother you, don't change it. But IMO anyone who does clutch dumps with an 04-05 is incurring massive amounts of excess clutch wear due to the presence of this delay. Of course removing it does add risks to the other (more expensive) components of the drivetrain.
You know there is a 5 year member active on the competition boards named "The Reverend" who is incredibly knowledgable about all things S2000, you may want to change your member name to avoid confusion.

 

captainmike,
although i agree with most of what you have said, this was the main point i want to get across to those reading this thread.
this thread was started by a new owner trying to figure out how to launch his car. it is not a slave cylinder thread started by expert s2k drivers looking for that extra advantage.

it's great that you have informed these new drivers of this potential inhibitor (and thank you jwa4378 for explaining this in detail), but it is dangerous to make a blanket statement of "this launch technique will not work unless you have removed your clutch slave cylinder delay" when that is just not true. Can it help you perform better at an autocross? i take your word that it does and perhaps one day i will change it out myself. Does it keep you from launching the car properly? no.

don't you agree it could be dangerous if every new owner ran out and changed their slave cylinder delay before weighing the costs?
anyways, my intention is not to argue about the benefits of making/not making the slave cylinder switch. Just wanted to make sure those reading this have all the info needed to make informed decisions.

re the name thing, i appreciate your heads up, but i'll just keep my name. i'm not here to steal anyones prestige, but i'm fairly certain i won't lead anyone down the wrong path either. and i'm sure if i do, one of you will point it out