Welcome to the North American Subaru Impreza Owners Club Saturday October 25, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-31-2005, 04:02 PM   #1
rites
Scooby Specialist
 
Member#: 50652
Join Date: Dec 2003
Chapter/Region: TXIC
Location: Dallas, Texas
Vehicle:
2000 Impreza 2.5RS
Pearl Sadona Red

Default launching a 2.5rs

I'm in the dark about what is the best way to launch a RS and at what rpm it is ideal to launch it at anyone mind clueing me in. A friend is wanting to see what my car could do next to his at the local drag strip
* Registered users of the site do not see these ads.
rites is offline   Reply With Quote
Old 08-31-2005, 04:05 PM   #2
svek
*** Banned ***
 
Member#: 82259
Join Date: Mar 2005
Chapter/Region: BAIC
Location: koledge at csus
Vehicle:
1999 impreza 2.2L
Brilliant Red <4EAT Club>

Default

rev it up to 6k and side step the clutch



@ what rpm depends a lot on your tires and mods. but i know you want to slip the clutch and not dump it. slip is like dumping it but it slightly slower. and your foot is keeping the pedal at bay the entire time


<---drives an auto

Last edited by svek; 08-31-2005 at 04:35 PM.
svek is offline   Reply With Quote
Old 08-31-2005, 04:32 PM   #3
AlpoRS
Scooby Newbie
 
Member#: 81338
Join Date: Feb 2005
Location: Portland, OR
Vehicle:
2005 2.5 RS Wagon
Crystal Gray Metallic

Default

ya, sidestepping the clutch is a terrible idea...sorry. That will kick the **** out of your transmission.

What you want to do to launch it is rev it up to about 5600 or so...i think thats the top of the power band, let the clutch out until you just begin move. Then push the clutch in so that it is just barely not touching. When you want to go, hammer the gas a split second before you start letting the clutch out, then when you do start to let it out, let it out fast enough so that you arent letting the engine sit at redline, but slow enough so that it doesnt drop below the power band...it take some practice.
Basically, you want to try and keep the rpms between 5000ish and redline just by how much the clutch is grabbing because you will be at WOT.
When it comes to shifting...just hammer through the gears once you get close to redline...it takes some practice. Go do it a few times before you go to the track, and learn where the power band starts and ends
AlpoRS is offline   Reply With Quote
Old 08-31-2005, 05:00 PM   #4
Demoted
Scooby Newbie
 
Member#: 88931
Join Date: Jun 2005
Vehicle:
05 RS
Regal Blue

Default

i have a stock 05 rs and i've out launched quite a few rex's by holding at 4k (peak torque) and slip the clutch as you gas it. I get a quick chirp outta my tires and never drop below 4k... gives me enough time in 1st without slipping for too long to shift and use 2nd till 5,600 etc. (and it saves your clutch a little more than holding at peak hp)

an RS has a very nice torque line, and wheelspin isn't excessive besauce of lack of power, some people will argue that you don't accellerate as fast while spinning, but i use the wheel spin to jump me to the speed i want to be in a short distance. It's also a technique if your good at anticipating when to launch the quick chip should be done a fraction of a second before light turns green, so when it's green your crossing the line at a faster speed than who's next to you.
Demoted is offline   Reply With Quote
Old 08-31-2005, 06:13 PM   #5
zmaster
Scooby Specialist
 
Member#: 88995
Join Date: Jun 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
11 WRX Premium
True Subaru color WRB

Default

what is WOT?
zmaster is offline   Reply With Quote
Old 08-31-2005, 06:14 PM   #6
svek
*** Banned ***
 
Member#: 82259
Join Date: Mar 2005
Chapter/Region: BAIC
Location: koledge at csus
Vehicle:
1999 impreza 2.2L
Brilliant Red <4EAT Club>

Default

wide open throttle.

see: acronym thread
svek is offline   Reply With Quote
Old 08-31-2005, 06:42 PM   #7
Calamity Jesus
Scooby Guru
 
Member#: 44501
Join Date: Oct 2003
Chapter/Region: South East
Location: in a minefield of caddishness.
Vehicle:
1984 "Skeletor from
"He-Man"

Default

The main trick is, as Alpo RS stated, put the slightest bit of load on the clutch before launching.. this gets all the gears and splines snugged up so that you don't have a violent shockwave rip through the driveline and tear things apart. Once you learn to do that.. beat away on it.. you're not going to break it with a mostly stock engine.
Calamity Jesus is offline   Reply With Quote
Old 08-31-2005, 11:12 PM   #8
FalconRS
Scooby Specialist
 
Member#: 92913
Join Date: Aug 2005
Chapter/Region: W. Canada
Location: Winnipeg, MB
Vehicle:
2005 2.5RS Wagon
Crystal Grey Metallic

Default

Right click --> Bookmark this page.

Thanks guys, great info here!
FalconRS is offline   Reply With Quote
Old 08-31-2005, 11:19 PM   #9
Lethargic1
Scooby Specialist
 
Member#: 20998
Join Date: Jul 2002
Location: All Bunny, NY
Default

Ok, so I know not to do it, what exactly is sidestepping the clutch?
Lethargic1 is online now   Reply With Quote
Old 09-01-2005, 12:15 AM   #10
svek
*** Banned ***
 
Member#: 82259
Join Date: Mar 2005
Chapter/Region: BAIC
Location: koledge at csus
Vehicle:
1999 impreza 2.2L
Brilliant Red <4EAT Club>

Default

imagine your foot fully depressing the clutch. then imagine moving your foot to the left while the car is in gear and gassed to redline.

uh oh.....spaghetti'os
svek is offline   Reply With Quote
Old 09-01-2005, 02:03 AM   #11
JonzFaSTi
Scooby Specialist
 
Member#: 85575
Join Date: Apr 2005
Chapter/Region: SCIC
Location: Orange County, CA
Vehicle:
2013 STi
Dark Gray Metallic

Default

No one uses the E-brake before the Launch???? I pull that thing up burn the clutch and launch I jumped on a 6sp G35 doing that until 2nd gear. But yeah it kinda burns your clutch I dont recomend it to often.
JonzFaSTi is offline   Reply With Quote
Old 09-01-2005, 02:25 AM   #12
Lethargic1
Scooby Specialist
 
Member#: 20998
Join Date: Jul 2002
Location: All Bunny, NY
Default

Quote:
Originally Posted by svek
imagine your foot fully depressing the clutch. then imagine moving your foot to the left while the car is in gear and gassed to redline.

uh oh.....spaghetti'os
hmm...I guess I can see why you wouldn't want to do this.
Lethargic1 is online now   Reply With Quote
Old 09-01-2005, 02:59 AM   #13
Caplin 2.5
Scooby Specialist
 
Member#: 71203
Join Date: Sep 2004
Location: SoCaL
Vehicle:
2005 2.5rs
Crystal Gray Metallic

Default

I've been practicing this non-stop. Every empty straight road i come to i do it. I've tried all sorts of launching.... revving up to peak hp (5600 rpms) and dropping the clutch, revving up to peak torque (about 4600 rpms) and dropping the clutch but my most recent one that i have yet to perfect and probably wont for a while since its such a bitch is holding the rev at about 5100 in between peak hp n torque, then let go of the clutch very slightly so the car starts rolling forwards then drop it. I guess i did what AlpoRS was saying.

When i did this one night on my way home i noticed that it was an extremely fast launch not as hard as revvin it up and dropping but fast without hearin tire screetch. It seemed to roll forward warming up then just launched off to redline.... the rpms never dropped below 5000 the meter just stayed at 5000 till the clutch grabbed then it picked up and slammed to redline. I still don't get how i did it.. i kept on tryin to do it again.... i guess i just slipped the clutch before droping it.
Caplin 2.5 is offline   Reply With Quote
Old 09-01-2005, 03:26 AM   #14
FalconRS
Scooby Specialist
 
Member#: 92913
Join Date: Aug 2005
Chapter/Region: W. Canada
Location: Winnipeg, MB
Vehicle:
2005 2.5RS Wagon
Crystal Grey Metallic

Default

This is a truly great thread. I posed this question in the proven power bragging because that's where the racers seem to hang, but got no sensible replies. Shoulda asked here I guess. I'm going to get out and give this a try first chance I get for sure. Thanks guys.
FalconRS is offline   Reply With Quote
Old 09-01-2005, 03:59 AM   #15
JonzFaSTi
Scooby Specialist
 
Member#: 85575
Join Date: Apr 2005
Chapter/Region: SCIC
Location: Orange County, CA
Vehicle:
2013 STi
Dark Gray Metallic

Default

caplin try using the e-brake when you launch that would be the result. But like I said its burns
JonzFaSTi is offline   Reply With Quote
Old 09-01-2005, 09:04 AM   #16
Calamity Jesus
Scooby Guru
 
Member#: 44501
Join Date: Oct 2003
Chapter/Region: South East
Location: in a minefield of caddishness.
Vehicle:
1984 "Skeletor from
"He-Man"

Default

I use the e-brake to hold the car in place while I take the slack out of the driveline.. but that's because I don't want to leave early and cross the lights when autocrossing.
Calamity Jesus is offline   Reply With Quote
Old 09-01-2005, 09:34 AM   #17
Master2192
RIP 10/12/83 to 02/10/08
Scooby Specialist
 
Member#: 83254
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Roy, Washington
Vehicle:
98 2.5 RS
04 WRX

Default

When i first went and tried a drag race at Pacific Raceways, my first time i tried launching at 3000 rpms and that wasn't quite enough. So then i tried 5000 rpms. I don't sidestep the clutch, i let it out like i was on the road except alot faster. The rest of my runs had a 2.000 Second 60 foot time. And my best run (after i got the shifting down and everything) was 15.86

This is a totally stock 98 RS with 1/4 tank of gas
Master2192 is offline   Reply With Quote
Old 09-01-2005, 01:33 PM   #18
Ruff
Scooby Specialist
 
Member#: 32131
Join Date: Jan 2003
Chapter/Region: NWIC
Location: Oregon City, OR
Vehicle:
2006 Nissan 350Z
Was 01 2.5 RS

Default

Quote:
Originally Posted by Master2192
When i first went and tried a drag race at Pacific Raceways, my first time i tried launching at 3000 rpms and that wasn't quite enough. So then i tried 5000 rpms. I don't sidestep the clutch, i let it out like i was on the road except alot faster. The rest of my runs had a 2.000 Second 60 foot time. And my best run (after i got the shifting down and everything) was 15.86

This is a totally stock 98 RS with 1/4 tank of gas
That is pretty good it for a stock 98, gj. For references, I pull 1.95 60' all day long. I was doing this with at first just an Injen intake, where I pulled a 15.005, and consitant 15.1s. Then with full exhaust I could still pull mid 1.9 60' with 14.910 being my quickest 1/4 with high 14s to 15 flat all day long.
Ruff is offline   Reply With Quote
Old 09-01-2005, 01:38 PM   #19
Master2192
RIP 10/12/83 to 02/10/08
Scooby Specialist
 
Member#: 83254
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Roy, Washington
Vehicle:
98 2.5 RS
04 WRX

Default

Your trap speed is higher than mine. My best was low 85 mph. My friends were trapping at higher speeds so i guess i beat them in the 60 foot. Anyone know why the 99s have a faster 0-60 time than the 98s? I thought nothing changed except some interior stuff..
Master2192 is offline   Reply With Quote
Old 09-01-2005, 02:03 PM   #20
Caplin 2.5
Scooby Specialist
 
Member#: 71203
Join Date: Sep 2004
Location: SoCaL
Vehicle:
2005 2.5rs
Crystal Gray Metallic

Default

Quote:
Originally Posted by Hughesj04
caplin try using the e-brake when you launch that would be the result. But like I said its burns
Wait im confused can you explain that?

Lemme try n clarify here... I rev it up and pull the e-brake up while the clutch is depressed then I drop the e-brake and launch? please explain, im intrested.
Caplin 2.5 is offline   Reply With Quote
Old 09-01-2005, 02:14 PM   #21
impr25rs
Scooby Specialist
 
Member#: 60162
Join Date: Apr 2004
Location: PDX, OR
Vehicle:
04 Aspen RS
The One Not Turbo'd, NA!!

Default

Caplin you roll up, stop, pull up the e brake, push the clutch in and rev to where you want to launch. Then hold the revs, let the clutch out slowly till you feel it grab slightly. The car will squat in a sense. The front will lift a little and the back will sink. Push the e brake button and hold the lever up. Then when you want to go, lift up on the clutch, drop the ebrake and step on the gas at the same time. This style takes the slack out of the suspension.

Oh and this makes the clutch smell if lift the clutch and hold the e brake. My DSM buddy showed me this and he can launch my car a crap load better then I could doing the normal way.
impr25rs is offline   Reply With Quote
Old 09-01-2005, 03:10 PM   #22
Ruff
Scooby Specialist
 
Member#: 32131
Join Date: Jan 2003
Chapter/Region: NWIC
Location: Oregon City, OR
Vehicle:
2006 Nissan 350Z
Was 01 2.5 RS

Default

Quote:
Originally Posted by Master2192
Your trap speed is higher than mine. My best was low 85 mph. My friends were trapping at higher speeds so i guess i beat them in the 60 foot. Anyone know why the 99s have a faster 0-60 time than the 98s? I thought nothing changed except some interior stuff..
98s have less hp, then 99-present. Like 162 hp vs our 165. Plus 00-01 are SOHC vs your DOHC.
Ruff is offline   Reply With Quote
Old 09-01-2005, 03:24 PM   #23
Caplin 2.5
Scooby Specialist
 
Member#: 71203
Join Date: Sep 2004
Location: SoCaL
Vehicle:
2005 2.5rs
Crystal Gray Metallic

Default

Quote:
Originally Posted by impr25rs
Caplin you roll up, stop, pull up the e brake, push the clutch in and rev to where you want to launch. Then hold the revs, let the clutch out slowly till you feel it grab slightly. The car will squat in a sense. The front will lift a little and the back will sink. Push the e brake button and hold the lever up. Then when you want to go, lift up on the clutch, drop the ebrake and step on the gas at the same time. This style takes the slack out of the suspension.

Oh and this makes the clutch smell if lift the clutch and hold the e brake. My DSM buddy showed me this and he can launch my car a crap load better then I could doing the normal way.

Hmmm i think i'll give it a go tonight...
Caplin 2.5 is offline   Reply With Quote
Old 09-01-2005, 03:27 PM   #24
impr25rs
Scooby Specialist
 
Member#: 60162
Join Date: Apr 2004
Location: PDX, OR
Vehicle:
04 Aspen RS
The One Not Turbo'd, NA!!

Default

Quote:
Originally Posted by Caplin 2.5
Hmmm i think i'll give it a go tonight...
Just remember to release the clutch a little, enough to make it squat.
impr25rs is offline   Reply With Quote
Old 09-01-2005, 03:37 PM   #25
Caplin 2.5
Scooby Specialist
 
Member#: 71203
Join Date: Sep 2004
Location: SoCaL
Vehicle:
2005 2.5rs
Crystal Gray Metallic

Default

will do thanks for the info.
Caplin 2.5 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB/WTT : 08+ SWP 2.5rs hood DG39 NWIC Private Classifieds 13 07-28-2011 06:03 PM
FS : Sold krylon 1993 - 2001 Impreza Specific Parts 9 06-16-2010 08:51 PM
how do i launch with my 2002 2.5rs spankmeplz700 Newbies & FAQs 1 06-30-2002 12:04 PM
('93-'01) '01 2.5RS or '02 2.5RS jRS2.5 Impreza Forum 24 05-25-2001 08:03 AM
02 2.5rs vs 01 2.5rs Blindeye_03 General Forum Archive 8 02-24-2001 11:56 PM


All times are GMT -4. The time now is 03:01 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.