Lanches, launches, and more launches!

[SexyDSM95]

How do you drag racers get er' done?

Since I am on stock cams I like to rev up to around 4800-5000RPMS and just let er' loose!

[Intercooled T]

I can only hold to about 2500 rpms...:(...I need a better rated converter

[subwrxkid]

sexydsm...what happened to launching at 6k

[SexyDSM95]

sexydsm...what happened to launching at 6k
What happened to learning how to read throughly? I said that if I launched at 6k all 4 of my tires would spin. Not ONCE did I say that's how I launch all the time or it's great for the car.

[99SL2_Modder]

1300-1400 on brake-torquing.

Not like it matters. I could probably do a 2k if the track wasn't slippery. TC doesn't go high enough past that.

[TurboTagTeam]

The only awd car I'v ever launched is a porsche 911 TT. And all I can say is that launching a awd car is not as easy as some people think. It takes some skill to launch them things right.

[subwrxkid]

The only awd car I'v ever launched is a porsche 911 TT. And all I can say is that launching a awd car is not as easy as some people think. It takes some skill to launch them things right.
lol yea it is...but everyone thinks it is easy...you never know until you try!!

[03tarmacblack]

The only awd car I'v ever launched is a porsche 911 TT. And all I can say is that launching a awd car is not as easy as some people think. It takes some skill to launch them things right.

x2 You cant just drop the clutch( unless your dumb enough to do a redline launch). Farthest I got was slipping my old clutch at 3k rpms... it got out good enough. I havent launched my twin plate yet and I dont plan too.

[2point4DSM]

I slip it at about 2k. The motor is big enough to spin up the 60-1 pretty fast and lag is pretty much non-existent.

[subwrxkid]

x2 You cant just drop the clutch( unless your dumb enough to do a redline launch). Farthest I got was slipping my old clutch at 3k rpms... it got out good enough. I havent launched my twin plate yet and I dont plan too.
I totally agree with you Tarmac...DROPPING THE CLUTCH IS SO DUMB!!

[Mr Tomtastic]

Rev/hold at 4k and slip the clutch, once I start moving I let the clutch go. Not good for the clutch, but I'd rather replace a clutch than a transfercase, axle, transmisson(although a new RA gearset would be nice)

If I get it right, It gets off the line hella quick. I beat my friend in a ws6 because of an awesome launch.

[dolphinS4]

Read a great article once about launching AWD cars. It had a couple of great tips among them, never just dump the clutch, but rather catch it quickly and then let it all the way out. More to it than that, but this is the summary.

As for the RPM's of the lauch, that has to depend on the car. Optimal launches are achieved holding the revs at just above max tourqe RPM's. Anything more is a waste or abuse of the drivetrain. Holding them just above the max power helps account for bog once the clutch is engaged.

[On Sale]

Ok here is how i launched my 2g gsx and the list of mods i had.
-intake
-1g bov
-mbc
-uicp

Not much, almost stock. SOoOo when i first got my car, COMPETLY STOCK , i was a newb and i tried to launch it at 5-6k and well it wasnt good. the clutch cooked up and i had to replace it. lol.

BUT after i practiced, and taught MY SELF how to launch , here is my procedure.

1. Pull the Ebrake up. and hold the button it, so i can release it quick.
2. Bring the RPMS to about 3500-3800
3. Let the clutch out to about 50% and the back of my car would "squat" down (will explain later on in the post).
4. As i let the e-brake down i let the clutch out, at the same time, in one motion.
5. And off i went, with no problems and one hell of a launch. My friends would compliment me on how crazy of a launch it was.


Ok so here is my reasoning for using the e-brake. Whenever i would launch my car, the whole back end would slam down when i launched it, and there would be kinda a delay, or wait until the assend went down and then the car would move. almost unnoticable, but still noticable. So when i used the ebrake, it would preload the suspension,and that "delay" would go away.

I really dont car what you guys say about my technique, wether it be good or bad, i dont care. You know why? because it was my way of launching and it never failed. i never once bogged using this techinique and never once was i out launched.

[igo4bmx]

i launch at 2k rpm and can't grab traction till the last couple feet :o

[SilverBulletRL]

rev to 1800 - 2000rpms and slip the clutch until i feel the winter tires grab (LOL)

[subwrxkid]

I rev to about 4500 maybe 5000 if its going to be a close race...slip the clutch gentley..no to much that I burn it but enough so I don't bog and brake diff's lol...kinda easy since Ive been doing if to abuot a year lol

[95nracer]

I rev to about 5500 then let the clutch out. If I rev below 5000 I bog big time. This is with a 9 pound flywheel and ACT clutch.

[IBLIS]

2500rpm and feather the clutch till my tires grab. Which normally doesn't happen till the middle of 2md gear.. Damn FWD :)

[igo4bmx]

i've actually never tried to launch with my setup, since i have 2 step and anti lag, i'm not really sure

[96s14]

yea i spin all through first if i launch above like 2800 rpms :(

[criz]

i hold the revs to 4500-5k and feather it out pretty quickly... works every time

oh yea, i keep the dccd in auto too

[subwrxkid]

criz- you should test it out against me some time..love to give it a shot

[SRT42EnVy]

it sucks with FWD, i launch at like 2500 and slip the clutch, at first i get traction then the top of first i spin and the whole second gear, it sucks, i wish i had AWD.

[SRT42EnVy]

criz- you should test it out against me some time..love to give it a shot
You always wanna race somebody, lol.

[subwrxkid]

exuse me brad...but criz is my subie buddy

[SRT42EnVy]

exuse me brad...but criz is my subie buddy
OK........ :thumbup:
whats that mean :confused:

[MuddyREX]

I try not to launch my car at all.....

[subwrxkid]

lol especially with a wrx lol

[SexyDSM95]

I totally agree with you Tarmac...DROPPING THE CLUTCH IS SO DUMB!!
What's REALLY dumb is trying to slip the ACT2600...oh wait the ACT2600 doesn't slip DUH!

[eastsidesuby19]

I usually...rev to about 5000-5500, its a little different now with the VF34 but i just keep reving(not letting the B.O.V release)...bring it to about 5gs then just feather the clutch out and ive only had one bad launch and it bogged like a motha F***er think because it was under 5000

[wgknestrick]

Spinning through 1st is sometimes the best way to launch depending on the car and turbo setup.

There is a fine line between spinning and bogging. Spinning only loses you minor time while bogging cost you dearly, timewise and driveline-stress wise. I would always want my tires to be the first thing to "break" loose in an AWD.

Spinning an awd on launch isn't nearly as detrimental as it is in a 2wd because you are still moving foward at a considerable rate plus the turbo is spooling.

I always go for consistancy in my car and that means 5K "dumps". The max torque quote from before seems to prove accurate in every car and mine makes it around 4500 RPMs. They aren't really dumps, but more of semi quick release of the clutch. If you hear a bang, you did it too fast, and if you smell clutch, too slow (or clutch could be toast). I've read the like "stepping out of dog ****" analogy from Nasioc. Also remember that your car makes a considerbly different powerband when in 1st gear compared to 4th (or whatever gear your car is dynoed in). There is so much less load on the engine in 1st gear, and less load = less hot gasses = longer turbo spool = lower power later in RPMs.

High hp and awd still equals spinning in 1st (and my case 2nd) on any surface. I've just found it better to drive with that throttle body wide open through it than try to feather it to the limit of traction.

Wet roads are a different story because you can actually spin the tires fast enough to justify throttle feathering. Anyone who has ever been in my car in the rain when it lights em up in 3rd will know what I mean.....scary

Bill

[subwrxkid]

What's REALLY dumb is trying to slip the ACT2600...oh wait the ACT2600 doesn't slip DUH!
oo yea..tell them...so what im guess just rev and let go...that just might work!!

[subwrxkid]

sexydsm- with those techniques you must put down in the upper 2's for your 60ft times

[subwrxkid]

Spinning through 1st is sometimes the best way to launch depending on the car and turbo setup.

There is a fine line between spinning and bogging. Spinning only loses you minor time while bogging cost you dearly, timewise and driveline-stress wise. I would always want my tires to be the first thing to "break" loose in an AWD.

Spinning an awd on launch isn't nearly as detrimental as it is in a 2wd because you are still moving foward at a considerable rate plus the turbo is spooling.

I always go for consistancy in my car and that means 5K "dumps". The max torque quote from before seems to prove accurate in every car and mine makes it around 4500 RPMs. They aren't really dumps, but more of semi quick release of the clutch. If you hear a bang, you did it too fast, and if you smell clutch, too slow (or clutch could be toast). I've read the like "stepping out of dog ****" analogy from Nasioc. Also remember that your car makes a considerbly different powerband when in 1st gear compared to 4th (or whatever gear your car is dynoed in). There is so much less load on the engine in 1st gear, and less load = less hot gasses = longer turbo spool = lower power later in RPMs.

High hp and awd still equals spinning in 1st (and my case 2nd) on any surface. I've just found it better to drive with that throttle body wide open through it than try to feather it to the limit of traction.

Wet roads are a different story because you can actually spin the tires fast enough to justify throttle feathering. Anyone who has ever been in my car in the rain when it lights em up in 3rd will know what I mean.....scary

Bill
your car is just a crazy monster...400whp is nuts!!

[2point4DSM]

What's REALLY dumb is trying to slip the ACT2600...oh wait the ACT2600 doesn't slip DUH!

Sure it does. When I use to have a carbon kevlar clutch and 6 puck I use to slip them too. It's all about feathering the clutch pedal and playing with the throttle at just the right RPMs.

You can slip anything. Ask MxMissile about the time I smoked the ACT 2600 in 1st, 2nd and 3rd gear. I got a little distracted and probably forgot to let off the clutch completely in 1st and immediately over-heated or glazed it. I drove it another eighth mile and it grabbed normally again in 3rd. Parked the car for 30 min, then raced him with no problems.

Some clutches just take abuse better than others. Still the tranny smelled of burnt clutch for several days.

[2point4DSM]

Spinning through 1st is sometimes the best way to launch depending on the car and turbo setup.

Bill,
What tires are you running. I really can't spin through first cause then I end up spinning through 2nd as well. By then the car has usually drifted towards the next lane and I have to let off a bit. I've got sport all-season tires till I can beef up the driveline a bit more. So for now I'm a lot more consistent just slipping it a bit around 2k rpms.

But before I got the stroker motor your approach use to be my way of thinking as well.

[subwrxkid]

Sure it does. When I use to have a carbon kevlar clutch and 6 puck I use to slip them too. It's all about feathering the clutch pedal and playing with the throttle at just the right RPMs.

You can slip anything. Ask MxMissile about the time I smoked the ACT 2600 in 1st, 2nd and 3rd gear. I got a little distracted and probably forgot to let off the clutch completely in 1st and immediately over-heated or glazed it. I drove it another eighth mile and it grabbed normally again in 3rd. Parked the car for 30 min, then raced him with no problems.

Some clutches just take abuse better than others. Still the tranny smelled of burnt clutch for several days.
wow a couple days..must have burnt it bad...but then again..im sure its easy to do it when you got a car puttin down as much power as yours...im not sure on the numbers but I def heard rumors...its a beast!!

[slavetothemuzic]

I just stand on the brake and give it gas till it feels like it's about to break loose, which is generally about 1400-1500 rpms.

Hopefully I can get a new higher stall torque converter before spring comes.

[05OCsrt-4]

I rev to about 1,500-2,000 if nemore no traction when it grabs, punch it and go, (w/ my boost controller, full boost doesn't kick in until about the end of 1st, beginning of 2nd)

[SexyDSM95]

Blah blah blah I dump clutches because someone can't read...

[igo4bmx]

Sure it does. When I use to have a carbon kevlar clutch and 6 puck I use to slip them too. It's all about feathering the clutch pedal and playing with the throttle at just the right RPMs.

You can slip anything. Ask MxMissile about the time I smoked the ACT 2600 in 1st, 2nd and 3rd gear. I got a little distracted and probably forgot to let off the clutch completely in 1st and immediately over-heated or glazed it. I drove it another eighth mile and it grabbed normally again in 3rd. Parked the car for 30 min, then raced him with no problems.

Some clutches just take abuse better than others. Still the tranny smelled of burnt clutch for several days.


Wil have you ever tried a twin disk clutch setup? I always hear those are pretty hard to engage and slip easily

[2point4DSM]

I heard they are hard to slip too. Never tried. But I heard the guy driving the AMS galant was slipping it.

[the mike]

...oh wait the ACT2600 doesn't slip DUH!

Says you.:mrgreen:

[SexyDSM95]

Says you.:mrgreen:
Says me who "supposedly" holds the clutch @ 6K all the time because people can't read.

[SpendOne]

I dump my clutch at 6k, cant launch it anything lower b.c it will bog out badly. I do slip the clutch out of the hole as well. I have a ACT2600.

[wgknestrick]

Bill,
What tires are you running. I really can't spin through first cause then I end up spinning through 2nd as well. By then the car has usually drifted towards the next lane and I have to let off a bit. I've got sport all-season tires till I can beef up the driveline a bit more. So for now I'm a lot more consistent just slipping it a bit around 2k rpms.

I usually run GY eagle GS1 in summer, but now I have the cheap Summi HTR+ on for winter. Doesn't really matter though as both behave the same. I haven't run my car offically yet due to my ever decreasing clutch. ACT 6P. There is so little life left in it it's not even funny. I don't want to replace it and not pistons/heads at the same time so it has to live for now (no money for mods). Clutch surely didn't last long, although my horible driving while breaking it in didn't help. I still expect more than 10K miles out of a clutch though. This was the worst SOB to drive for the 1st 1K miles. It hasn't let go yet, but engagement is up to the last .5" of pedal travel. Not fun to drive like that.

I think your problem may be your tires/pressures and or allignment. I feel my tires "spinning" on the street, but my car is never a chore to control. I only have -1deg of camb in the front (small for subies). Just feels a little washy through those gears as the tires scrub some pavement. I run high pressures around 38-40 psi, but only due to all around tire wear, not because of drag racing/traction.

Make sure your allignment is on as well too. Your car should feel straight if setup properly (of course you have that DSM unequal length drivetrain which could cause torque steer). That will kill your starts if you are running significant - camb and/or toe in the front. You need big flat contact patches while accelerating which is sig different from what makes your car handle well.

If you are still having problems try running bigger rear tires if you can fit them. I know they fit on Subys and many run them, not sure on DSMs though. 70% or more of your traction comes from the rear.

Other than that, just be thankful that you have this problem and not a broken drivetrain/ little HP. Always better to have just a little more hp than traction because you are at your limit. When you start raising your limit, you start breaking things. The Big Valley STI learned this in the 1st STI/EVO shootout. They changed from slicks to streets and won the 2nd shootout spinning through 1st 2nd and some of 3rd gear. Thing is they were consistant and didn't break.

I would hate to give you the advice that caused your drivetrain to choke.

[subwrxkid]

Says me who "supposedly" holds the clutch @ 6K all the time because people can't read.
man sexydsm....go figure...for someone who talks about people reading...have you seen how many responses you got to the dumping the clutch at 6k...just to spin your tires!!

[SRT42EnVy]

theres really nothing wrong with spinning your tires with AWD, your not really losing time from it, but there is no point if u can go just as fast launching smoothly, i believe that u can spin if u drop the clutch at 6, but im sure thats not how u launch the car at the track or wherever.

[subwrxkid]

this is so over...I could care less how sexydsm launches her car...im not her and never will be..so it doesnt matter what you do to your car..anyways if you wanna go ahead and test your setup or launching skills against me...drop me a pm when your out and about and we will do a pull!!

[SRT42EnVy]

this is so over...I could care less how sexydsm launches her car...im not her and never will be..so it doesnt matter what you do to your car..anyways if you wanna go ahead and test your setup or launching skills against me...drop me a pm when your out and about and we will do a pull!!
LOL

[LSHatch]

Rev to 7k, slip the clutch. That's about the only way with my car.

[SexyDSM95]

this is so over...I could care less how sexydsm launches her car...im not her and never will be..so it doesnt matter what you do to your car..anyways if you wanna go ahead and test your setup or launching skills against me...drop me a pm when your out and about and we will do a pull!!
Do I smell a douche? The responses I got were because you went off in a tangent ASSuming I dump my clutch @ 6K at the track all the time. Not my fault you don't want to comprehend what you are reading. But it's cool you can continue to run mid 12's with $5,000 into your car...I will let you continue to feel that is impressive :roll:

And you are correct, my set up doesn't matter and it is my car. I will do what I want with it and you deem it to be stupid fine. It's not your car don't worry about it.

[HuffRex]

Rev Engine between 5500-6000k slip the clutch out on the third yellow light, sets me up for 1.9 60 footers.

[SexyDSM95]

Do you guys stage deep or shallow?

[teh DIRT]

deeep! only because i need all the room i can get with the automatic trans. :thumbsdown:

[the mike]

I always go deep.


OK, seriously though. I just light the Stage bulb. Go on the last amber, and I usually try to waver the rpms so that they are coming up as I am letting off the clutch. Slip it a little around 4500-5000 and as soon as the car starts to roll, let it out. I wish I could launch like Justin with the blue EVO. He was a maniac.

I was totally kidding about the ACT2600 too, I slipped mine a couple of times on the street by accident. :)

[subwrxkid]

Do I smell a douche? The responses I got were because you went off in a tangent ASSuming I dump my clutch @ 6K at the track all the time. Not my fault you don't want to comprehend what you are reading. But it's cool you can continue to run mid 12's with $5,000 into your car...I will let you continue to feel that is impressive :roll:

And you are correct, my set up doesn't matter and it is my car. I will do what I want with it and you deem it to be stupid fine. It's not your car don't worry about it.
awesome...so were you down for a pull or two?? just checking since you talk like you have something super special

[SexyDSM95]

awesome...so were you down for a pull or two?? just checking since you talk like you have something super special
Check the garage I have everything in there :mrgreen:

[PSI Chick]

if i am using my 2-step, i have it set at 3800 rpm and build about 6psi before launch. i've only launched on this three times, i'm still trying to get the timing down.

if i'm not using the 2-step, i rev around 5k and slip it a little, leaving on the last amber. i typically do low 1.8/high 1.7 60's, shallow stage.