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Old 08-27-2005, 04:31 AM   #1
pro2cer604
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Default my sad cobb stage 2 1/4 mile time

So, 2nd time at the drag strip brought upon some dissappointment.
First time I went, last year, my car was stock, except for blitz intake. I ran 14.9 consistantly.

This time, I had a cobb stage 2 with STi Uppipe, MRT downpipe with highflow cat, blitz catback and K+N panel filter. 12lbs rims, springs, swaybars. I was hoping for low 14's even high 13's as some of the guys posted here. I dropped my clutch at 5000rpm's, even chirped a little bit with 18psi in the tires. I got 14.67

the slip is this:

R/T .451
60' 2.360
330 6.333
1/8 9.553
MPH 76.42
1000 12.328
1/4 14.672
MPH 95.37

What the Hell!?!
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Old 08-27-2005, 04:39 AM   #2
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fine tune that 60' time and u could lose at .5 second off of your quarter. ive also found that shifting slightly before redline gets u in the next gear quicker ready for another spool. try shifting around 6500 ur mph might go up a little which will bring ur time down.
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Old 08-27-2005, 04:42 AM   #3
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protune
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Old 08-27-2005, 04:48 AM   #4
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dont drop your clutch.... expensive mistake, slip it at 5000
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Old 08-27-2005, 04:54 AM   #5
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Quote:
Originally Posted by my02sti
fine tune that 60' time and u could lose at .5 second off of your quarter. ive also found that shifting slightly before redline gets u in the next gear quicker ready for another spool. try shifting around 6500 ur mph might go up a little which will bring ur time down.
I was shifting at 7200rpm (cobb redline) I found that I wasn't seeing much boost when I shifted up. only 13psi not 16psi. your theory would answer that!
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Old 08-27-2005, 05:08 AM   #6
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yeah your boost flattens out a little prob when u get around 6600-7000 plus ur spool prob kicks hard around 3300-3600 which a 6500-6700 shift will put u right near that 3500. u should see ur traps go up and ur time go down. 60 ft is key, it compounds as u go down the track. ur reaction time looks pretty good a perfect reaction is .50 but shouldnt have to much to do with ur over all time. as the filiment on the last yellow light of the start tree burns out go. u will hit the green and that .50 will become easier to hit. run with only a couple of gallons in the tank also. water weighs 8lbs. a gallon not sure about gas but its prob heavier. the cooler the engine the faster as well. be creative ice the intake, ic, etc. experiment. 13s right around the corner.
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Old 08-27-2005, 08:44 AM   #7
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i thought you were supposed to put more psi in the tires than normal.... like 40psi or whatever on 1/4 days....

like everyone else said, i think you're main issue is your 60 ft times... they should be like 1.8 for an averagely well launched subaru (i havent gotten below 2.05 cause i suck)

chile
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Old 08-27-2005, 09:23 AM   #8
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Quote:
Originally Posted by my02sti
yeah your boost flattens out a little prob when u get around 6600-7000 plus ur spool prob kicks hard around 3300-3600 which a 6500-6700 shift will put u right near that 3500. u should see ur traps go up and ur time go down. 60 ft is key, it compounds as u go down the track. ur reaction time looks pretty good a perfect reaction is .50 but shouldnt have to much to do with ur over all time. as the filiment on the last yellow light of the start tree burns out go. u will hit the green and that .50 will become easier to hit. run with only a couple of gallons in the tank also. water weighs 8lbs. a gallon not sure about gas but its prob heavier. the cooler the engine the faster as well. be creative ice the intake, ic, etc. experiment. 13s right around the corner.

I think gas is lighter. Thats why is floats on water. Good point though. I had stage 2 people asking me what i was doing at the Norwalk subie event. There were a couple of guys running cobb stage2 and setting at 14 flat or so. They were disappointed. I found out that the one guy had afull tank. I run about a 1/4 or less. Most of the time when i leave the track the light is on and i have to get gas asap. Also you 60' is teh sux0r. You need to work on your launch. If your just shooting for ET then screw the lights. Just lauch when you are ready. RT has nothing to do with 1/4 mile times. If you are going to braket race then concentrate on the lights because that will win the race for you., not your ET.

BTW i ran 13.5 with a 1.9 60ft at 100.6 cobb stage 2

My latest time with a vf30,utec, txstopmount,sti injectors

13.21 with a 1.9 60ft at 105

Clutch was slipping in all gears. My oem clutch was toast. I barely got home. I basically had to rev to 3k and dump it to even get moving form a stop. I just put in a new clutch but have not be back to the track yet. I am hoping for 12's.

You'll get there, good luck. Practice makes perfect.
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Old 08-27-2005, 10:42 AM   #9
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yeah it's mostly the driving. I haven't been able to do anything with mine in stage 1, 2, or 2.5 as a matter of fact I ran twice with 2.5 and had worse times than stage 2 even though my trap speeds went up about 3 mph. my clutch is slipping very bad on launch so I basically go nowhere in 1st gear. pretty dissapointing, but then again my goal was not to break anything so I guess I shouldn't be to surprised.
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Old 08-27-2005, 11:04 AM   #10
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Quote:
Originally Posted by SubasaurusWrex
dont drop your clutch.... expensive mistake, slip it at 5000
We have a winner. When you drop you do 2 things.

1. Kill you trans
2. Bog the car

Slipping will keep you revs up, and if you get it right, get you in to the 13's. However, you probably are less likely to kill your trans, you will kill your clutch eventually. Racing of any kind wears out car parts. If you can't afford to fix things, don't race it.
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Old 08-27-2005, 02:37 PM   #11
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you need to get better than 1.9 60' time to be on 13's.
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Old 08-27-2005, 03:30 PM   #12
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Bad 60' time is why..get that under 2.0 and not only will your overall E.T. drop but your mph will probably get closer to 100mph.

Dont worry about reaction time, my best runs i sit at the tree when its green sometimes i dont care if my reaction time is a 2.3 lol.

And while were busting out track time.. i ran a [email protected] back in 2002 with an STI muffler, K&N filter, and an MBC. Thats it, but it was in the winter.
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Old 08-27-2005, 05:40 PM   #13
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Dropping clutch at 5k with 18 psi in the tires = Dead tranny
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Old 08-27-2005, 06:23 PM   #14
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Yea 18psi? Mine are at like 42 for autox...I guess drag racing is different but that still seems way off.
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Old 08-27-2005, 06:32 PM   #15
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how do you guys improve on 60' times? any specific techniques?
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Old 08-27-2005, 06:49 PM   #16
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rev to 5000 and slip the clutch, balancing revs and forward motion. Slip to much and you just burn up the clutch, let out to fast you bog the car and beat on your trans.
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Old 08-27-2005, 06:50 PM   #17
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you ran 95 MPH which is not bad. i've run from 94 to 98 on Cobb Stage II. mostly depending on the weather.

I ran 13.9 with a 1.95 as my best. usually in the 14.2X range, which is disappointing, but that's because I'm too conservative at the launch and shifting.

you've got to slip the clutch to get a good and safe launch. it's mostly a matter of practice and getting a feel for the clutch and gas. you can take the revs to 5K like you said, but don't dump the clutch. slip it as you press the gas. Get it right and you'll know it because the car will catapult from the start. Get it wrong and you'll either bog or smoke the clutch.


I tend to bog


oh yeah. increase your tire pressures. Low pressures are too increase the traction at launch in 2wd cars or cars with wrinkle slicks, etc. You've got plenty of traction. You want to increase tire pressue to reduce the rolling resistance of your tires. put in 40psi and you'll go faster for sure. 18psi is like riding a bike on flat tires .
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Old 08-27-2005, 11:35 PM   #18
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I do not get all these MPH's and times posted. I have an 05' wagon with TBE and MBC and have run 13.60's at over 99 mph. What is involved in a cob stage II?

But anyway......pump the tires up, when you are waiting at the light and before you get to the light keep reving the engine to heat up the exhaust and turbine. I hold the rpm around 4000 and hold the clutch pedal out just before it engages. When it's time to go do the following very quickly...Let the clutch out enough to get the car to start moving then let it out completly as you simultaneously stab the gas. Also, if you are quick with the shifting....do not take your foot off the gas when you shift gears. With boost control to make boost past the factory setting shift at 7k rpm. Atleast this is what my car likes.
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Old 08-28-2005, 01:50 AM   #19
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Quote:
Originally Posted by DrtJnky
I do not get all these MPH's and times posted. I have an 05' wagon with TBE and MBC and have run 13.60's at over 99 mph. What is involved in a cob stage II?

But anyway......pump the tires up, when you are waiting at the light and before you get to the light keep reving the engine to heat up the exhaust and turbine. I hold the rpm around 4000 and hold the clutch pedal out just before it engages. When it's time to go do the following very quickly...Let the clutch out enough to get the car to start moving then let it out completly as you simultaneously stab the gas. Also, if you are quick with the shifting....do not take your foot off the gas when you shift gears. With boost control to make boost past the factory setting shift at 7k rpm. Atleast this is what my car likes.

I guess I should drive it like I stole it!

13.6 is great! what do you do for fuel management with your MBC?

Cobb stage 2 is just Turbo back. but i have sti uppipe and K+N drop in
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Old 08-28-2005, 02:23 AM   #20
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60' 2.360
Try this when lauching, 1st, dont worry about the tree, dosnt effect time. With that out of the way keep the rpms around 2,000-2500. On the 2nd yellow floor the car, once the rpms fly up try and catch the tack at around 5k and off you go. works wonders for me.
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Old 08-28-2005, 02:55 AM   #21
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Quote:
Originally Posted by WRX2FFU
I think gas is lighter. Thats why is floats on water.
just an fyi (not being a dick or anything), oil/fuel does float on water. not because it's "lighter" but rather because it is less dense.
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Old 08-28-2005, 04:31 AM   #22
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every time i go to the track i always forget to raise my tire pressure.

my car bogs really bad on the launch at the track, due to all the melted rubber and VHT

my best time was 13.5 at 92mph with a 2.0 60ft and a hole in one of my intercooler pipes. that same night an STI with cobb stage 1 and intake was running low 14's with a 2.0 60ft

i have a utec and use launch control and floor shift. the revs stay at 5500rpm and i make .7 bar of boost at the line. i let the clutch out very quickly. i rely a lot on that flow limiter that the 04's have which slows down clutch response.
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Old 08-28-2005, 05:04 AM   #23
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I've personally witnessed a 12.90 on Vishnu stage 1. Hah! [/outdoer]
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Old 08-28-2005, 10:41 AM   #24
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Quote:
Originally Posted by pro2cer604
I guess I should drive it like I stole it!

13.6 is great! what do you do for fuel management with your MBC?

Cobb stage 2 is just Turbo back. but i have sti uppipe and K+N drop in

I also have a K&N drop in, sorry, I don't really consider them a performance enhancer. I have nothing for fuel management, just the factory Subaru computer and boost set at 16psi.? The car has run pretty good from day one, even stock. The trick to it is to learn how to drive the car the way it wants to be driven. Experiment with different launch rpm's and different shift rpm's. If you can master "flat shifting" not taking your foot off the gas, you will go faster as the turbine need not blow boost off with every shift. Just remember that every pass down the 1320 is a possible disaster waiting to happen and Subaru is not real keen on fixing cars with obvious signs of abuse?
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Old 08-28-2005, 11:56 AM   #25
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wow, yeah i was pulling better times with my peg leg svtf (60 ft). and almost a better quarter, 15 flat. i have a question, i thought shifting in the rex without lifting gas was bad (worse than other 2wd transmissions) or about the same wear and tear.

drew
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