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

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Old 08-29-2013, 01:03 AM   #1
Rdunn
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not bad for a shakedown run..... 10.6@131mph

well even thou it was insanely hot today (over 100*s) I decided to go and just work on the cars 60's and just basicly get some passes on the new set-up out of the way.

I got to the track and there was only about 30 cars there total. there was no waiting in line you could literally just drive straight up to the starting line when you wanted to race. so soon as I got the car tech'd in I just went on up....not a great choice lol

car was still completely heat soaked from the hour drive to the track.

did my burnout, pulled to the line and left from idle. cut a 1.77 60'. car pulled great in first and second and then half way thru 3rd the iats were to hot and the car pulled all the timing out of it. literally felt like I just pulled to parachutes....so I let off the gas alittle before the end and coasted to a 11.1@127mph

After that I went and bought a bag of ice and threw it on top of the whipple. turned on my mini generator and pulled my fan in to start cooling down the car. this time I would wait till after the sun went down and the car had cooled off completely.

with the car cooled down I went back to the staging lanes. temp was about 85-88* and the DA was just over 3000. I dropped the tire pressure to 18psi in the 20" nitto 555r's and ran the car again.1.69 60'.... pulled great in first and second and most of the way thru 3rd....then parachutes lol. but much closer to the finish line this time. car went 10.6@131

now there is still a bunch of room for improvement in the 60' and also by adding some cooling mods to the car( some decent weather would also be nice) . I just bought all the stuff to add an ice chest to the trunk. so hopefully I can make a full pass here soon....then it's time to turn the bottle on.


here is a vid, sorry about the sound. the truck I was racing was open headers. so it was really messing with the mic on the camera.
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Old 08-29-2013, 01:10 AM   #2
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I watched this vid at the track and you can notice some sparks coming from under the car. but only for about the first 80-100'...I was looking at the track but could see anything with a flashlight. so im going to get under it tomorrow and see if I can find what it was. seems to only be doing while the car was squatting from the launch.
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Old 08-29-2013, 05:21 AM   #3
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good #'s. do you have a copy of the time slip? also were you spraying it?
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Old 08-29-2013, 05:33 AM   #4
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Well done, looks like you're on your way to 9's....I'm assuming you still have the 3.27 gears on the rear (factory), do you have any idea what your RPM's were at the end of the run?
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Old 08-29-2013, 05:53 AM   #5
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Nice pass.
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Old 08-29-2013, 07:22 AM   #6
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CONGRATS

Thinking come cool weather, you might need some 18's or smaller to get your best 60'

Was hoping to get down to your track this year-hasn't worked out-maybe next spring

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Old 08-29-2013, 08:16 AM   #7
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Very Nice Run!
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Old 08-29-2013, 09:15 AM   #8
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Nice run!

Give TrekGTO a PM and look into doing an AI Super Chiller to get your water temps down so it won't heat soak. I ran 3 back to back passes basically matbe 3-5 min. in between on Tuesday at 85+ degrees and my water temps were 40*,50*, and 53* starting and IATs were 50,60,65 degrees on the starts. Its a great way to ensure your IAT stay low and avoid knock.
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Old 08-29-2013, 10:04 AM   #9
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Quote:
Originally Posted by 94guy View Post
good #'s. do you have a copy of the time slip? also were you spraying it?
no bottle yet.

yep got the slip sitting right here.

r/t .547
60' 1.694
330 4.604
1/8 6.949
mph 105.27
1000 8.963
1/4 10.675
mph 131.50

my best time before was a 7.0 @ 100mph. but the weather was 62* and the DA was 1200....so I think this combo has a lot left in it with some cooler weather.

the weather/heat was so bad yesterday I really didn't think it was going to run anywhere near what it did.
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Old 08-29-2013, 10:09 AM   #10
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Quote:
Originally Posted by HRD_WRK View Post
CONGRATS

Thinking come cool weather, you might need some 18's or smaller to get your best 60'

I have a set of 17" weld rts sitting in the garage already.
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Old 08-29-2013, 10:12 AM   #11
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What was the temps and DA when you ran this time?
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Old 08-29-2013, 10:29 AM   #12
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Quote:
Originally Posted by Turbo99 View Post
What was the temps and DA when you ran this time?
its in the first post...

first pass around 96* and 3200 DA

2nd pass 85-88* and DA 3000+
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Old 08-29-2013, 10:33 AM   #13
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this is my set-up at the track. everything fits in the trunk. 2 chairs, mini generator, floor drying mini fan, ext cord.

its a great set-up. just load up and go to the track. no truck, trailer etc, etc. nice break from the racing im use to.

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Old 08-29-2013, 10:37 AM   #14
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It's that hot at night where your located?
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Old 08-29-2013, 10:41 AM   #15
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yep. yesterday was one of the hottest days we have had all year. it didn't get out of the 80's till almost 11pm

tonight it doesn't even get down to 80* till 4 am. then starts going right back up FML

https://www.google.com/#q=hourly+weather+st.louis+
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Old 08-29-2013, 10:55 AM   #16
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Old 08-29-2013, 10:59 AM   #17
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Nice numbers man is this on a stock 6.2? Cam?
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Old 08-29-2013, 11:03 AM   #18
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long block is 100% stock with a cam thrown in it.
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Old 08-29-2013, 12:36 PM   #19
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I usually start with the fan in front of the car, once the radiator is cooled down then I move the fan to the engine.
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Old 08-29-2013, 12:46 PM   #20
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The sparks looked like they were coming from right around the rear end. Its very strange. I watched it probably ten times trying to see.
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Old 08-29-2013, 12:56 PM   #21
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I did a pretty good search at the track. couldn't see anything. as soon as the baby goes to sleep this afternoon im going to get under it and look in the daylight
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Old 08-29-2013, 03:06 PM   #22
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found the source of the sparks

the bigger bolts used on the driveshaft were hitting some bracing when the car was squatting. it appears that they have gone ahead and clearanced themselves for me lol.

also found one spot on the new driveshaft rubbing on the tunnel, so I'm going to give that a little clearance also.

here are some pics.


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Old 08-29-2013, 03:58 PM   #23
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Damn time for some upgrades!
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Old 08-29-2013, 08:22 PM   #24
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You need to get some drag wheels and let that car leave like it's supposed to!!!
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Old 08-29-2013, 08:59 PM   #25
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its was only the second pass on the new set-up, give it some time. I have a set of 17" welds already in the garage for it.
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