poor 1/4 mile times - Page 3 - Subaru WRX Forum
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#31 Old 09-30-2004, 10:42 AM
 
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Hmm 7k clutch drops.... If you don't stop that, your tranny WILL go kaboom. You should slip the clutch. For a pure dropped clutch, a 2.0 60-ft time isn't that good, did you bog on the launch at all?
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#32 Old 10-01-2004, 12:32 PM
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A friend of mine who had an 03 wrx ran a 14.1 with just a 3" cat-back. 5k launches is what he told me.
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#33 Old 10-03-2004, 02:34 PM
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IBAUCLAPlaya,

Out of 3 runs, on 2 of them I did a little nose dive after the launch. Also, I don't think I quite have a feel for my shift points yet. I'm pretty new to racing so I still need tons of practice. I bet if I had more experience I could've ran at least a 14.8. A well experienced driver could've ran a 14.6 i bet. So yeah, that's probably not that great of a time, but I'm gettin there

How much stress can the gear set take from launching? I mean, I'm completely stock right now, until this weekend. As for launching though, I'll look around for more descriptions on how to do it safely without stripping my gearset. Unless you guys don't mind explaining again.

Thanks for the info guys

Joel
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#34 Old 10-03-2004, 03:01 PM
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Yesterday, I ran a 14.3 @ 94 with only tanabe catback and turboxs BOV, two mods that aren't going to help me. My 60' was 2.0.. i was happy.. It came on my third run.. i quit after that, figured i couldnt get too much better, and nothing broke so it was a good day
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#35 Old 10-03-2004, 03:32 PM
 
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6 k and then slip for launches. Your tranny won't take the dumps very long.
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#36 Old 10-03-2004, 08:03 PM
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Sweet, I'll try it at the next SCO Nights event. What about shift points?

Joel
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#37 Old 10-04-2004, 09:52 AM
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Quote:
Originally Posted by al5dsm
Yesterday, I ran a 14.3 @ 94 with only tanabe catback and turboxs BOV, two mods that aren't going to help me. My 60' was 2.0.. i was happy.. It came on my third run.. i quit after that, figured i couldnt get too much better, and nothing broke so it was a good day
See, that's what I'm talking about!!! ^^^^^
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#38 Old 10-04-2004, 02:49 PM
 
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Shift at redline. Some people like to shift at 6500, but I like the 7 k redline.
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#39 Old 10-05-2004, 01:06 AM
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Any particular reason? Would be cool to hear pros and cons of both methods.

Joel
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#40 Old 10-05-2004, 10:31 AM
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Quote:
Originally Posted by sumdumgoy
Any particular reason? Would be cool to hear pros and cons of both methods.
shifting at redline versus shifting just after peak power output:

the theory behind shifting at redline is that the faster your crankshaft is turning when you enter a new gear, the faster you will get to max power output at that gear.
*Less Bog*

the theory behind shifting at or right after max power output is that since your car makes (for example) 170HP at 5800rpm, but 150HP at 7000 RPM, you would not want to spend any time at 7000.
*More Average Horsepower*

at least that is how I see it.

all that being said, when I shift at 6000 versus shifting at 7000, I do better at the track...
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#41 Old 10-13-2004, 03:26 PM
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Angry

the first time i ran a 16.3 @ 91, 15.9 @ 91, and a 15.6 @ 90
6 months later still stock, launching at 6K 14.6 @ 92.5, with a 1.901 60'
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#42 Old 10-13-2004, 03:44 PM
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Quote:
Originally Posted by Rain_Racer
shifting at redline versus shifting just after peak power output:

the theory behind shifting at redline is that the faster your crankshaft is turning when you enter a new gear, the faster you will get to max power output at that gear.
*Less Bog*

the theory behind shifting at or right after max power output is that since your car makes (for example) 170HP at 5800rpm, but 150HP at 7000 RPM, you would not want to spend any time at 7000.
*More Average Horsepower*

at least that is how I see it.

all that being said, when I shift at 6000 versus shifting at 7000, I do better at the track...
That makes perfect sense. I guess the trick is knowing where your max power points are. Any secret to knowing that. ** sorry for the noob question ** When I got dyno'd or all the dyno's I've seen done only do 1 gear, is that correct? If that's true, is the power curve the same for all the gears or would it be different?

leewmlds,

Is there anything specific you noticed that changed about your driving to get you to those numbers?

thx

Joel
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#43 Old 10-14-2004, 08:20 AM
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Quote:
Originally Posted by sumdumgoy
That makes perfect sense. I guess the trick is knowing where your max power points are. Any secret to knowing that. ** sorry for the noob question ** When I got dyno'd or all the dyno's I've seen done only do 1 gear, is that correct? If that's true, is the power curve the same for all the gears or would it be different?

leewmlds,

Is there anything specific you noticed that changed about your driving to get you to those numbers?

thx
well my shift points came from the fact that my local 1/8 mile strip is never crowded on test and tune days, I have probably made 40 passes, just dont launch hard, let your intercooler cool off between runs, and your car can handle LOTS of runs in one night.

*trial and error*

but as for a good rule of thumb just try to notice when your car stops pulling hard, and when you know if you shifted it would pull harder, it is all about torque to the pavement... well at least for the first 1/8 mile.

really the biggest secret is that knowing your car can mean the difference between a 16 second 1/4 mile and a mid 14s time. Practice makes perfect.

Also the first gear ratio sucks a lot on a WRX so I shift to second at a lot lower an RPM than I shift into third.
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#44 Old 10-14-2004, 08:50 AM
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That's the beauty of launch control. I don't have to let off the gas to shift. It limits your RPM's to a pre-set limit (5500 rpm in my case) when the clutch is depressed. So, your throttle body stays open and the turbo stays spooled in between shifts. I noticed a difference of about 1/3 second from not using it to using it.
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#45 Old 10-14-2004, 06:54 PM
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Quote:
Originally Posted by Cosmo
That's the beauty of launch control. I don't have to let off the gas to shift. It limits your RPM's to a pre-set limit (5500 rpm in my case) when the clutch is depressed. So, your throttle body stays open and the turbo stays spooled in between shifts. I noticed a difference of about 1/3 second from not using it to using it.
Yes, I'm looking forward to wiring up a lauch-control mod in my car in the coming weeks that will do just what you explained. It'll act as a "stutterbox", and will allow me to shift without lifting. Oh, how nice that's gonna be.

-Chris
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