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Old 08-19-2013, 12:31 PM   #1
chilakas
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Join Date: May 2009
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2003 Wrx
Blue

Default Is my car a 12 second car?

I recently went to the track and this was my best time. Needless to say i am between not good and kind of bad at launching my car. But I have been practicing and I believe I am much better at it now.

r/t; .715
60'; 2.072
330; 5.700
1/8; 8.687
mph; 82.72
1000; 11.292
1/4; 13.468
mph; 104.04

So what do you guys think is 12 seconds whithin grasps?

2003 wrx stock motor
6 speed
18g (22 psi)
7.. injectors
fmic
ect.ect.ect
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Old 08-19-2013, 12:44 PM   #2
freddy121389
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2011 WRX Agile Auto
DGM 301whp 335wtq

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R/T can be significantly reduced. the trick I learned is to launch on the 3rd light just above the green. If you get the 60' time down to a 1.7~1.8 you may be able to pull out a high 12. Your final mph definitely refects a high 12 second pass. In my 2011 wrx I was able to hit a 12.9 @ 103mph with a 1.8 60'.
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Old 08-19-2013, 12:55 PM   #3
Anubis80
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Quote:
Originally Posted by freddy121389 View Post
R/T can be significantly reduced. the trick I learned is to launch on the 3rd light just above the green. If you get the 60' time down to a 1.7~1.8 you may be able to pull out a high 12. Your final mph definitely refects a high 12 second pass. In my 2011 wrx I was able to hit a 12.9 @ 103mph with a 1.8 60'.

R/T shouldn't play a factor here at all, unless this is bracket racing. That being said OP your 60' needs to drop as mentioned, but your trap is there for a 12 pass IF you can get in the 1.6-1.8 60'.
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Old 08-19-2013, 12:59 PM   #4
subezero
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6 speed? Launch the hell out of that thing!
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Old 08-19-2013, 01:08 PM   #5
freddy121389
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Quote:
Originally Posted by Anubis80 View Post
R/T shouldn't play a factor here at all, unless this is bracket racing. That being said OP your 60' needs to drop as mentioned, but your trap is there for a 12 pass IF you can get in the 1.6-1.8 60'.
I know, I never mentioned that it did play a factor. Just something to practice on. 60' is where it is all at.
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Old 08-19-2013, 04:19 PM   #6
SenorDucK
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You can milk a 12.9x with that power and weight (basing this off of the 2.0 60' and the 104mph).


When I used to drag my old fox chassis mustang I was also trying to get as deep as I could in the ET with not much MPH(power) to work with. Generally speaking, a tenth improvement in the 60' time can equate to as much as 1.5-2.0 tenths in the ET (assuming you don't miss a shift or change anything else drastically). Also you'll likely loose mph as you improve your 60' and drop your ET.

the bolded has always been pretty accurate in my experience, and I've heard it elsewhere as well! Disclaimer: your results may vary

EDIT: Before anyone gets upset, I must say this has been my experience for cars mostly running 12s-14s. I don't race 8-10 second cars.

Last edited by SenorDucK; 08-19-2013 at 04:23 PM. Reason: moar disclaimer
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Old 08-19-2013, 05:00 PM   #7
Dat8687
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I was able to hit a 12.48(109) with a 1.68 60 foot in my speed 6 (347-348 wheel)... But with 60 foots in the high 1.7-9 range it was high 12s(107 range).. That car was heavy mofo though 3550 without me in it I weigh around 200lbs now

I don't drag my rex..

I bet if you cut it down to like a 1.7-8 It would be right there close or at 12.9
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Old 08-19-2013, 05:08 PM   #8
DentMagnet
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Here's your times and distances and my calculated speeds in ft/sec and calculated accelerations in ft/sec^2. It may be accurate to better than 10%.
Does it seem to you that your accel of 9.04 ft/sec^2 from 60' to 330' is out of place?

dist;time;ft/sec;acc

60'; 2.072;59.97; 28.00
330; 5.700;90.79;9.04
1/8; 8.687;121;13.1
1000; 11.292;139.5;7.11
1/4; 13.468;152;5.92

Last edited by DentMagnet; 08-19-2013 at 10:09 PM.
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Old 08-19-2013, 06:20 PM   #9
chilakas
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If I get in the 12s I will be happy and the work I put in it will be worth it
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Old 08-23-2013, 01:34 PM   #10
ScoobyDoo42
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Built, PTE5830, PSM

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A general rule of thumb, is every tenth dropped from you 60ft is roughly 2 tenths at the 1/4. If you dropped your 60ft from 2.0 to a 1.7, that is roughly .6 dropped in the 1/4. With an 18g you should definitely be mid-low 12's. What fuel? What RPM are you launching at? That trap speed seems fairly low for an 18g.

Usually a stage 2 STi (granted displacement difference and torque) they are trapping in the 106-110 range pending boost levels (18-21psi on pump 93) and ranging between 12.4-12.8 in the quarter.

Hope this helps.

-BJ
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Old 08-23-2013, 06:17 PM   #11
DentMagnet
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I came up with slightly different numbers and here's how I did it.

Your distances and times follow a smooth curve as given by
Dist = A x t^B = 17 x t^1.7, with A = 17 and B = 1.7, as seen below and gives a close fit without using a much more complicated formula.

dist time dist = At^B
60 2.1 60.0
330 5.7 327
660 8.7 672
1000 11 1002
1320 13 1331

I changed the formula to give 12 sec and watched how the other values fell out.
The new formula uses A = 19.3 and B = 1.7

dist time dist = At^B
60 1.94 59
330 5.26 325
660 8.03 666
1000 10.15 993
1320 12.00 1319
and gives a 60' elapsed time of 1.94 seconds.

Assuming this curve multiplication is valid, you need to change your 0 to 60' average speed from 29 ft/sec to 31 ft/sec and your acceleration from 28 ft/sec^2 to 32 ft/sec^2.

One way to confirm this method is to look at distances and times and speeds for other similar cars and see how their curves shift up or down to get their distances and times.
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Old 08-24-2013, 12:40 AM   #12
chilakas
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Quote:
Originally Posted by ScoobyDoo42 View Post
A general rule of thumb, is every tenth dropped from you 60ft is roughly 2 tenths at the 1/4. If you dropped your 60ft from 2.0 to a 1.7, that is roughly .6 dropped in the 1/4. With an 18g you should definitely be mid-low 12's. What fuel? What RPM are you launching at? That trap speed seems fairly low for an 18g.

Usually a stage 2 STi (granted displacement difference and torque) they are trapping in the 106-110 range pending boost levels (18-21psi on pump 93) and ranging between 12.4-12.8 in the quarter.

Hope this helps.

-BJ
Well when i was at the track i was trying too launch at around 5500 but unfortunately i was not aware that my car was equipped with launch control. I had no experience using lc . When i was launching i was not holding the throttle long enough to build boost, so when i launched it was still on vacuum.
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Old 08-24-2013, 11:31 AM   #13
DentMagnet
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Tweaking the numbers, I think you need 1.84 seconds in the first 60'.

dist .....time .....predicted dist = 22.3 x t^1.65

60 .....1.84 .....61.0
330 .....5.07 .....324.4
660 .....7.72 .....650.6
1000 .....10.04 .....1003.4
1320 .....12.00 .....1345.7

The formula now fits your actual time and distance within +/-2% and with these two columns, speed and acceleration at each distance marker can also be figured.

Yet, these two similar performing cars
dist time
0 0
60 2.515
330 6.313
660 9.304
1000 11.901
1320 14.084
60 2.07
330 5.7
660 8.69
1000 11.3
1320 13.5
seem to say that for every half second slower in the 60' time you also lose a half second in 1320' time.

Last edited by DentMagnet; 08-24-2013 at 08:06 PM.
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Old 08-25-2013, 10:37 AM   #14
ScoobyDoo42
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Built, PTE5830, PSM

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Quote:
Originally Posted by chilakas View Post
Well when i was at the track i was trying too launch at around 5500 but unfortunately i was not aware that my car was equipped with launch control. I had no experience using lc . When i was launching i was not holding the throttle long enough to build boost, so when i launched it was still on vacuum.
From what it sounds like you are bogging off the line which would be from releasing clutch too quickly and not allowing to grab and pull. You can still get a good launch without the Launch Control, but the Launch Control will allowing you to release the clutch a little bit quicker and allow more pull off the line.

The best way I can explain and help with you getting out of the hole a lot better and quicker, and this sounds ridiculous, is to find a dirt/gravel road. As weird as it sounds, it helped me a lot with being able to launch my car when I first got it (6 years ago). What it did is was rev it to 4000-4500rpms (letting it bounce up and down between there, this was before I had Launch Control), I would release the clutch to where the engagement point is, but not where it is going to move (as if you are staging at the track), and on the upward rise of the rpms, I would slightly release it a little to where you are feeling the car move forward, then dump the clutch mid engagement. If you don't break the tires loose, then you didn't do it correctly.

This sounds insane haha but thats how I have been pulling between lower 1.6's to 1.75 60' times on street tires.

Hope this was helpful and if you are confused and have any questions you are more than welcome to pm me.

-BJ
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