Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

how to leave from a dig...with an STI


  • Please log in to reply
15 replies to this topic

#1 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 03 August 2013 - 06:39 PM

I drove a 95 mustang cobra for 13 years and Now with my friends influence I just bought a 2012 STI and well Im having a hard time leaving the line...it just bucks then takes off...any tips would be aprreciated...it has so many different options with locking the wheels and sport mode...I just cant figure out what combination to use when racing.  I have been a mustang guy and I came on here because I know nothing about subarus so I am trying to learn...any help would be appreciated.

Attached Files



#2 bratman18

bratman18

    ADIDASubarus

  • Members
  • 3,431 posts
  • Jefferson, Maine

Posted 03 August 2013 - 07:09 PM

Full lock and launch!



#3 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 03 August 2013 - 09:41 PM

THANKS!!! What RPM is good?


Edited by StiAnthony, 03 August 2013 - 09:42 PM.


#4 bratman18

bratman18

    ADIDASubarus

  • Members
  • 3,431 posts
  • Jefferson, Maine

Posted 04 August 2013 - 06:56 AM

That might be something you have to test out. Is your car completely stock? You will find that if you're not launching at a high enough RPM then it will still bog down a bit. But if you do it right it will take off screaming and have you shifting pretty quickly. But yeah, if you turn the dial to full lock, and dump the clutch, it might spin slightly, but it will mostly just throw you back in the seat and GO! And the 6spd and R180 take it very well! For even better launching, it wouldn't be a bad idea to upgrade your bushings to take some of the driveline slop out of it.



#5 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 04 August 2013 - 11:53 AM

car is completely stock 2012 with 8000 miles... i'll try to leave at like 3000 and adjust from there...Ill report back when I get a good combination....also should I take traction control off when I do this or leave it on?



#6 bratman18

bratman18

    ADIDASubarus

  • Members
  • 3,431 posts
  • Jefferson, Maine

Posted 04 August 2013 - 12:04 PM

car is completely stock 2012 with 8000 miles... i'll try to leave at like 3000 and adjust from there...Ill report back when I get a good combination....also should I take traction control off when I do this or leave it on?

Not positive, but doesn't the traction control limit the amount of throttle? I would think you should turn it off. It won't spin a ton anyway with it on full diff lock.



#7 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 8,489 posts
  • Charlottesburg, VA

Posted 05 August 2013 - 08:57 AM

Don't need to worry too much about wheel spin with AWD. Even if you do spin it's still going to pin you in the seat and take off. Much more important to keep boost up and keep the engine in the proper RPM range than to worry about spinning wheels.

#8 nickb21

nickb21

    Subaru Fanatic!

  • Members
  • 558 posts
  • Hunterdon County

Posted 05 August 2013 - 01:16 PM

Welcome aboard!

 

IANACT (I am not a clutch torturer), and have only driven an STI a handful of times. I would imagine you're gonna have to get the rev's up there, maybe closer to 5k and then dump it. Or maybe mash the throttle and quickly slip the clutch at the same time from 3-4k.

 

Let us know what you get to work. Those summer tires are pretty grippy if I recall correctly.



#9 Numbchux

Numbchux

    EJ conversion addict

  • Members
  • 5,985 posts
  • Duluth, MN

Posted 05 August 2013 - 01:47 PM

Launching an AWD turbo car is a skill, to say the least. And it has been covered many times over the years in many different formats. I did a few searches, and didn't come up with much, so I'll give a basic overview here. I think there was an excellent article in one of the old Subiesport magazines....I'll see if I can dig it up and post it.



Fastest way off the line on pavement in an AWD turbo car involves letting the clutch slip a bit. You need to keep the rpms up enough so that you can continue to build boost. If you let the clutch out too quickly, the rpms will drop too much, and the turbo will not be able to spool (I suspect what you are feeling now).


There are ways around that. Launch control/antilag will help build boost without any load on the engine (this can be tuned into the stock ECU on older cars....I would imagine it can on the newer ones too). This is what you're seeing when you see a built AWD drag car, or Global Rallycross car launch. But it's very hard on the drivetrain.

#10 fishy

fishy

    USMB is life!

  • Members
  • 259 posts
  • Nova Scotia, Canada

Posted 06 August 2013 - 05:19 AM

The way I remember an STi launch being described (can't remember who, but it was a pro) was in the 4000rpm range with more clutch slip than you think you should be using. 

Obviously this is high stress for the drivetrain and I don't think I'd do many of them with my own car but it'll fire you out of the hole like a mortar. 

One thought I had was that you could maybe practice up on a dirt surface to get the feel without the whiplash or bogging out too bad.

 



#11 O.C.D.

O.C.D.

    Subaru Fanatic!

  • Validating
  • 690 posts
  • Colorado Springs

Posted 06 August 2013 - 07:46 AM

I had to learn in my 2011 WRX.  Found that the sweet spot was around 3500-4200.  Slip it to get going and then dump the clutch.  You really only slip enough to get the car moving.  I will admit, learning to launch a turbo'd AWD WRX was a clutch smoking experience at times.  When you get it right though, damn!!!

 

If you are modding look into the COBB Acces Port (tuning) and get the map that has launch control - pretty cool.



#12 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 06 August 2013 - 10:52 AM

well I tried 3,000 grand and no good...then I tried 4,000 and it was nice...but it can def go higher Im going to try to do a 4500 launch next time... thanks for all the great tips!!! I love this car!



#13 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 07 August 2013 - 09:03 PM

5000 grand launch for the win!! a little wheel hop and out...I was told that the STI trans can handle this no problems.  is this correct?  if not I will just leave the line with a little roll and then mash it.



#14 bratman2

bratman2

    Eat, Live, Breath Subaru

  • Members
  • 429 posts
  • Aurora

Posted 07 August 2013 - 10:46 PM

Long term I would go with a little roll!! You have front and rear end stress along with clutch and transmission. Axles also!! Launching an all wheel drive car is like launching a liter bike. You got to have revs and slip but like you say when you get it right, damn!!



#15 bratman18

bratman18

    ADIDASubarus

  • Members
  • 3,431 posts
  • Jefferson, Maine

Posted 08 August 2013 - 03:59 AM

STi drivetrain is damn tough. There are plenty of people out there running 600+ to them and running them down the track, with no real issues. The axles are the weak point, but I don't think at your power level you will have any issues.



#16 StiAnthony

StiAnthony

    Newbie

  • Members
  • Pip
  • 8 posts
  • toms river

Posted 11 August 2013 - 07:33 PM

Thanks guys!! so far I love this car!






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users