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Old 09-03-2007, 10:21 PM   #1
geist
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Default Another "What should I launch at" thread!

hello,
I posted this over in motorsports and they said to "Ask all the power provers" because you're more knowing about the straights....I know there are plenty of threads probably already floating around for this, but hey, I gotta get my own specific replies, too, y'know!!

I plan on seeing what my car (05 sti) is capable of in the 1/4 very soon, and was wondering if someone could point me to the right RPM range I should be launching at....

I have a TurboXS Turbo-back (Catless) and Cobb OTS Stage2 right now...
(and new tires, ecsta spts, for whatever that's worth, if anyone has any experience launching on those.)

I've launched on deserted roads, and gotten 4.7 0-60, and a 13.4 1/4, but I honestly don't have much launching experience under my belt..

These times should clean up given the track's stickier, yeah??

Any help/advice would be mad appreciated!

Someone there said I should side-step it at 6500rpms...
I like myself too much to be doing that, I was under the impression I should be doing it lower than that???
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Old 09-04-2007, 01:44 AM   #2
Digitalfiend
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Quote:
Originally Posted by geist View Post
Someone there said I should side-step it at 6500rpms...
That person would be an idiot. With a stage 2 setup you should be launching anywhere between 4500-5500 RPM using the quick-slip method and it all depends on traction. Try rocking/pumping the throttle quickly between 5000-5500rpm and then come off the clutch smoothly, slipping it slightly (but never stopping your foot from moving up.) Keep on the throttle while you're doing this then floor it as the car leaves the line and the clutch is fully up. You should get a slight chirp and be scambling for 2nd. This should net you a 1.7x 60ft. YMMV.

Also, you should also have your stage 2 tune verified. My 05 STi with the OTS Cobb Stage 2 map only made 8whp (yes 8) and 50wtq over stock. It felt very strange to drive that car. Instant torque that would break the wheels loose and then fall flat on its face (relatively speaking.) After my conservative lapping day ProTune, I put down 30whp and 65wtq over stock but my torque curve was smooth and boost held on longer.

Honestly, if you're going to the strip for the first time, prepare to be disappointed until you get the hang of it.
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Old 09-04-2007, 12:17 PM   #3
xXSTi-lynXx
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spay IC for 10 sec to rid HS
rev to 4500 5500 and bounce
now in a swift but controlled motion let the clutch out and right before engagement mash down the throttle at the same time
dont take foot off gas at all when shifting just have a fast foot on the clutch
letting off the gas makes you lose full boost for a short time
so dont do it.... do all this right and you should be in the 12.8-13 range in a stock sti.
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Old 09-04-2007, 12:32 PM   #4
geist
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i'll take advantage of the abandoned road, and give it a couple attempts..
all that's been said so far is essentially what i've been doing...

What's "Stage 2 tune verified" mean??

Whatever it is, I feel like that's the case, haha...
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Old 09-04-2007, 07:57 PM   #5
1/500yellowwrx
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Quote:
Originally Posted by geist View Post
i'll take advantage of the abandoned road, and give it a couple attempts..
all that's been said so far is essentially what i've been doing...

What's "Stage 2 tune verified" mean??

Whatever it is, I feel like that's the case, haha...
Other words, get a real tune on your car and do not depend on the the one Cobb has provided for you. People do not realize how important it is to get each individual car tuned. Every car runs different and launch the car around 5000-5500rpms with a slight slip. Anything less will cause a bog and kill your time.

Dave
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Old 09-04-2007, 09:38 PM   #6
geist
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Originally Posted by 1/500yellowwrx View Post
People do not realize how important it is to get each individual car tuned.
I definitley realize this...
However, I live in Maine, and our economy is... how do you say? Crap...

Money isn't my best friend at all times... haha.
Definitley plan on getting that done up asap.

Thanks for the advice.
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Old 09-04-2007, 10:35 PM   #7
1/500yellowwrx
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Sorry, I was not trying to be a jerk. There are just a lot of people on here that think just because they slap so engine management on the car everything is fine. Good luck on the launching. The only way to improve your time is practice. Once you feel it you'll be putting down 1.6-1.7 60fts all day long
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Old 09-05-2007, 08:58 AM   #8
geist
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Quote:
Originally Posted by 1/500yellowwrx View Post
Sorry, I was not trying to be a jerk. There are just a lot of people on here that think just because they slap so engine management on the car everything is fine. Good luck on the launching. The only way to improve your time is practice. Once you feel it you'll be putting down 1.6-1.7 60fts all day long
Don't worry bro, I didn't take any offense.
and even if I did, it's the internet, who cares!

no worries man.
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Old 09-05-2007, 03:00 PM   #9
johnzhouse
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What RMP should the engine return to after shifting into 2nd? 3rd? When I tried launching at ~5200 RPMs my car returned to ~5200 in 2nd and maybe a little higher in 3rd after shifting at around 6700RPMS. Is this normal?
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Old 09-05-2007, 04:25 PM   #10
Speed
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Originally Posted by johnzhouse View Post
What RMP should the engine return to after shifting into 2nd? 3rd? When I tried launching at ~5200 RPMs my car returned to ~5200 in 2nd and maybe a little higher in 3rd after shifting at around 6700RPMS. Is this normal?
Are you serious!?
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Old 09-06-2007, 12:45 AM   #11
xXSTi-lynXx
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dude i dont know what you are all saying, but the trick is in a 05 sti is rev
to ~ 4500-5500 rpms let clutch out and floor it at the same time, then dont let off the gas till your done racing (QUICK CLUTCH FOOT)
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Old 09-06-2007, 12:53 AM   #12
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Get launch control and you can flat foot shift all day, I usually launch my WRX with launch control at about 5200 rpms. With regular street tires though I was losing grip and spinning all four tires, so I could probably bring it down a little. Dunno about an STi though.
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Old 09-06-2007, 08:01 AM   #13
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Are you serious!?
Sounds like your just another @$$ hole... Blow me!
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Old 09-06-2007, 08:17 AM   #14
downsti
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Quote:
Originally Posted by 1/500yellowwrx View Post
Other words, get a real tune on your car and do not depend on the the one Cobb has provided for you. People do not realize how important it is to get each individual car tuned. Every car runs different and launch the car around 5000-5500rpms with a slight slip. Anything less will cause a bog and kill your time.

Dave

what you said about 5000 - 5500 rpm launch is not really tru
it really depends on your power band

well i launch and rev around 4300 - 5000rpm
and my tires basicly jus spins on the stock re070 on track or street
if launch higher i basicly do a stand still 4 wheel burn out then bam it hooks
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Old 09-06-2007, 11:21 AM   #15
Speed
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Originally Posted by johnzhouse View Post
Sounds like your just another @$$ hole... Blow me!
I might be... but that's one of the dumbest questions ever (especially if you are a car enthusiast) If you're not... then you should've specified in your post.

Just search!

www.f-body.org/gears/

Look a simple gear calculator. Put your gear ratios and that's it. You get mph/rpm for every gear.
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Old 09-06-2007, 12:11 PM   #16
johnzhouse
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Quote:
Originally Posted by Speed View Post
I might be... but that's one of the dumbest questions ever (especially if you are a car enthusiast) If you're not... then you should've specified in your post.

Just search!

www.f-body.org/gears/

Look a simple gear calculator. Put your gear ratios and that's it. You get mph/rpm for every gear.
I believe that my clutch is slipping in-between shifts... OK, so maybe I could have worded the question a little better, but if that's the dumbest thing you've ever heard then you must live a pretty sheltered life.
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