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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 07-07-2013, 12:04 PM   #1
Jason@JacFab



 
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My observations from tracking my new 13 2LS

Finally got enough miles on the car to take it out. I did a little research on what the v6er's w/ an a6 have been doing for launches and figured I would start there.

I ran my usual tire pressures, pumped the front up to ~45, and ran the rears at ~24-26.

I started out by just "flashing" the converter, to just above an idle it seems highly recommended by the fast v6 people? These first runs were done getting the rpms up to about 800.

60' 1/4 ET 1/4 mph time
2.277 15.114 92.37 10:02pm

2.279 15.058 93.00 10:09pm

2.247 15.054 92.57 10:51pm

Next I tried getting up on the "stall", which there isn't much of... I tried launching at 1000-1200 rpms

60' 1/4 ET 1/4 mph time
2.268 15.051 92.80 10:57pm

--intermission for burnout contest at 11pm--

2.290 15.105 92.64 1:04am

"flashing" and "stalling" left me disappointed every single time. I kept thinking to myself, this thing is faster than that, it takes off better on the street when I just push on the gas, so the next series of runs, I did just that. Floor it from an idle.

60' 1/4 ET 1/4 mph time
2.24 14.919 93.66 1:10am (following this run, I just started making hot laps as the track was gong to close soon)

2.224 14.859 93.84 1:21am

2.214 14.821 94.08 1:26am

2.204 14.786 94.15 1:30am

The DA at the start of the runs was ~2550, and at the end of the runs was ~2330.

TC on / TC off, ST on / ST off, it didn't seem to matter, in the end I just ran with TC off and ST on. Each run I would do a small burnout, using M1, get it spinning up to ~6000rpms and let off the brake. All runs were just run in D, foot to the floor. Unfortunately for me, no sport mode on this car. Don't bother to use the paddle shifters on your 2LS, it's worthless, the car will still shift when it wants, not when you want it, so I didn't play with them at all...

It seemed like when I tried to "flash" or "get on the stall", the car just didn't take off very fast at all... Almost as if it was starting out in 2nd gear? In the end my best times came from just flooring it from an idle... The car never showed a hint of ever wanting to spin the tires, regardless of tc on/off. Just punch it and go... No wheel hop either, so I think it's probably pointless at this time to put the BMR trailing arms on it as they would just add weight.

That said, I think the car could greatly benefit from an aftermarket stall converter.
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Last edited by Jason@JacFab; 07-07-2013 at 02:19 PM.
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Old 07-07-2013, 02:01 PM   #2
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Quote:
Originally Posted by RacnJsn95 View Post
Finally got enough miles on the car to take it out. I did a little research on what the v6er's w/ an a6 have been doing for launches and figured I would start there.

I ran my usual tire pressures, pumped the front up to ~45, and ran the rears at ~24-26.

I started out by just "flashing" the converter, to just above an idle it seems highly recommended by the fast v6 people?

60' 1/4 ET 1/4 mph time
2.277 15.114 92.37 10:02pm

2.279 15.058 93.00 10:09pm

2.247 15.054 92.57 10:51pm

Next I tried getting up on the "stall", which there isn't much of... I tried launching at 1000-1200 rpms

60' 1/4 ET 1/4 mph time
2.268 15.051 92.80 10:57pm

--intermission for burnout contest at 11pm--

2.290 15.105 92.64 1:04am

"flashing" and "stalling" left me disappointed every single time. I kept thinking to myself, this thing is faster than that, it takes off better on the street when I just push on the gas, so the next series of runs, I did just that. Floor it from an idle.

60' 1/4 ET 1/4 mph time
2.24 14.919 93.66 1:10am (following this run, I just started making hot laps as the track was gong to close soon)

2.224 14.859 93.84 1:21am

2.214 14.821 94.08 1:26am

2.204 14.786 94.15 1:30am

The DA at the start of the runs was ~2550, and at the end of the runs was ~2330.

TC on / TC off, ST on / ST off, it didn't seem to matter, in the end I just ran with TC off and ST on. Each run I would do a small burnout, using M1, get it spinning up to ~6000rpms and let off the brake. All runs were just run in D, foot to the floor. Unfortunately for me, no sport mode on this car. Don't bother to use the paddle shifters on your 2LS, it's worthless, the car will still shift when it wants, not when you want it, so I didn't play with them at all...

It seemed like when I tried to "flash" or "get on the stall", the car just didn't take off very fast at all... Almost as if it was starting out in 2nd gear? In the end my best times came from just flooring it from an idle... The car never showed a hint of ever wanting to spin the tires, regardless of tc on/off. Just punch it and go... No wheel hop either, so I think it's probably pointless at this time to put the BMR trailing arms on it as they would just add weight.

That said, I think the car could greatly benefit from an aftermarket stall converter.
+1 on stall converter! My car runs the best when I leave slightly above idle! I've tried it many different ways and about 700-800 is what it likes.
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Old 07-07-2013, 11:02 PM   #3
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Its not the converter. There are throttle limiting tables in the tune that wont allow 100 percent tps until XXXX rpm. Then on top of that, there are tq limiting tables that will only open the throttle enough to see 100 kpa. NEED TUNEAGE
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Old 07-10-2013, 02:12 PM   #4
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I run TC/ST off, in M, launch at 2500 and let it shift for you. If you shallow stage and time the yellow light right you can get into the 2.1 60s. My best out of two trips was 14.64 @ 96.31
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