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| Slant Six Forum https://slantsix.org/forum/ |
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| Launch technique https://slantsix.org/forum/viewtopic.php?t=27803 |
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| Author: | Bren67Cuda904 [ Wed Mar 12, 2008 4:56 pm ] |
| Post subject: | Launch technique |
http://www.slantsix.org/forum/viewtopic.php?t=27754 I am having some lean spikes as discussed in the above thread and wanted to split up the track launching technics that may avoid the above problem all together. Does it seem plasiable to hold the car at the line hard enough to get the vacuum secondaries to open some without the car moving. Maybe 1/2 throttle and on green hit the gas from 1/2 to full throttle and let the brake go at the last moment. Without drag tires my car would simple go up in smoke, but I with now be running them and this should no longer be a problem. (traction) My thinking is that the two leak spike would have passed before the car even moved and therefor not count against me. Or with it still bog? I kind of like the idea of coming off idle and using the engine momentum timed just right to launch me out of the hole at green. Again with a drag tires, otherwise up in smoke again. The tires are here yet otherwise I would have tested this theory already. |
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| Author: | Bren67Cuda904 [ Wed Mar 12, 2008 5:10 pm ] |
| Post subject: | |
You don't suppose there really any great chance of breaking the 8 1/4 rear in this car with any of these launch types is there? I will be running 235-60-15 BFG drag radials with the 3.55 rear and Auburn posi) |
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| Author: | Joshie225 [ Wed Mar 12, 2008 5:18 pm ] |
| Post subject: | |
You shouldn't be able to get the secondaries to open with the car at a standstill unless you have a really high stall converter and maybe a transbrake. I doubt you'll break the 8 1/4 with an automatic. |
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| Author: | emsvitil [ Wed Mar 12, 2008 5:29 pm ] |
| Post subject: | |
10 . . . 9 . . . 8 . . . 7 . . . 6 . Main Engine Ignition . 5 . . . 4 . . . 3 . . . 2 . . . 1 . . . 0 . Lift-Off .
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| Author: | argentina-slantsixer [ Wed Mar 12, 2008 6:49 pm ] |
| Post subject: | |
Quote: You don't suppose there really any great chance of breaking the 8 1/4 rear in this car with any of these launch types is there? I will be running 235-60-15 BFG drag radials with the 3.55 rear and Auburn posi), do you, Houston?
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| Author: | Shaker223 [ Wed Mar 12, 2008 7:04 pm ] |
| Post subject: | |
I've had carbs in the past where I could not get out the flat spot on a launch. This technique worked: Try a slight load on the convertor and a real fast double pump on the accelerator pedal and staying at full throttle on the second pump. Sounds goofy but has worked. Usually on thermoquads where the throttle shafts are worn real bad and there is a vacuum leak. |
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| Author: | CARS [ Thu Mar 13, 2008 7:03 am ] |
| Post subject: | |
Sorry I can't give some help with your hesitation problem but I can give you some other advice based on what you said above... If you wait for the green bulb to light you have already lost  .I leave on the last yellow. Because my Dart is so slow to react I leave when it glows. On my brothers muskrat I leave when the bulb dims because it leaves so good. You just need to find your sweet spot, even with a hesatation you should be able to cut a good light in theory. |
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| Author: | Slanted66 [ Thu Mar 13, 2008 8:08 am ] |
| Post subject: | |
I am also looking for a better launch technique. Is there any concern with hurting the 904 and 7 1/4 by powerbraking with a relatively stock slant and street tires? |
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| Author: | Bren67Cuda904 [ Thu Mar 13, 2008 8:32 am ] |
| Post subject: | |
Quote: I leave on the last yellow. .
You mean you initiate launch on the last yellow.  If you leave on the last yellow you lose. (red light )
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| Author: | CARS [ Thu Mar 13, 2008 9:23 am ] |
| Post subject: | |
Quote: Quote: I leave on the last yellow. .
You mean you initiate launch on the last yellow. If you leave on the last yellow you lose. (red light ) . That is why I said you will have to find what your car wants to leave at. |
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| Author: | Shaker223 [ Thu Mar 13, 2008 10:49 am ] |
| Post subject: | |
Watch how you stage too. Shallow or deep. This can affect your RT as well. |
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| Author: | Davids63Dart [ Thu Mar 13, 2008 6:49 pm ] |
| Post subject: | |
I deep stage, I stage right as soon as the pre-stage light flickers off, Then leave right about at the very middle of the last yellow. It gets me .000 to .040 lights every time. Although, my car does only get 2.9 60ft times. In my 70 Nova though, I stage very shallow. As soon as the stage light flickers on. then I leave at right about the center of the last yellow. I get .000 to .040 lights that way all the time, but I also red light more with the Nova than with the Dart. I get 2.0 60ft times with the Nova. |
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