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

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Old 07-18-2014, 11:41 AM   #1
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Car falls on face after about 10ft rolling out

Went to local 1/8th mile track last night launched car from 3000-5000. No matter what I did it would hookup when i released the clutch go about 10ft then fall on its face.Its not bogging at the initial hit just when car rolls out. During burnout box no problem just when it hooks and starts rolling out. The rpm drops like traction control cutting power then car just picks back up and hauls ass. I held the traction control button down 8 seconds turns on both lights giving me full control. Dont understand in the street I can slip the clutch at 3200rpms hazes the road and moves out. All you Manual 6sp track gurus give me some input. Car has cam,TSP headers,3.91 gears,ported throttle body,ported intake,Nx 150shot with standealone fuel system and fastlane coldair intake.I posted in another thread a member said fastlane intakes heat soak real bad.I only have couple of options because of my fuel cell.
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Old 07-18-2014, 03:27 PM   #2
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Log your runs and see what the data is telling you.
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Old 07-18-2014, 03:47 PM   #3
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What's the best with most user friendly data logger
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Old 07-18-2014, 03:59 PM   #4
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What's the best with most user friendly data logger
I just assumed you had HP Tuners or something to log with. I would invest in it or EFI live.
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Old 07-18-2014, 04:04 PM   #5
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Nah man I'm just getting into this racing scene. I'm going to order one in a few so next Thursday I can see what's going on .
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Old 07-24-2014, 01:11 PM   #6
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I have the same problem. I suspect it has to do with torque management/powerhop settings. it doesnt want to pull hard in first gear but once im in 2nd then it takes off
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Old 07-25-2014, 12:09 AM   #7
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Do you have a line lock when you do you're burnouts and do you have a separate clutch reservoir?
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Old 07-25-2014, 06:37 AM   #8
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It's gotta be in the tune
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Old 07-25-2014, 01:35 PM   #9
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Are you slipping the clutch out of the hole? You have to ride the clutch out and keep the rpms up, my car would do the same thing also. I hated the 6 speed, put a th400 in it like I did. You'll never look back, my car is faster and much more fun.
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Old 07-26-2014, 08:49 AM   #10
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I had Johnathon from Tickperformance Data logged my car at track. He left at 5300rpms car dead hooked rolled out 10ft then fell on its face again. We looked at the data the computer closed the throttle 15% .RPM dropped to 1400rpm then open back up to 100% throttle. What he found was a wheel speed sensor setting on one of the tables set at 15mph and certain rpm range. He disabled it raised rpm setting up. Then it started raining so we couldnt test again but we think we found the problem.
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Old 07-26-2014, 10:27 AM   #11
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Interesting, I wonder if my car had the same issue. My car was doing the same thing with the stick. Wouldn't matter what RPM I left at, always seemed to feel like it was getting dragged down right after launch.
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Old 07-26-2014, 10:32 AM   #12
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Bad70supreme I'm 100% positive it was same issue. He went through tables that he normally don't go into to find it.
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Old 07-27-2014, 02:23 PM   #13
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Interesting. I had mine at the track yesterday for the first time with the supercharger and 18' drag radials. Things hook like mad on a good track but it would either hop or bog down out of the hole. I didn't even need a burnout.

Now I get why guys say an automatic with a converter is better for the track in these cars.
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Old 07-27-2014, 05:04 PM   #14
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If I would have known this I might have gave my stick more time.
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Old 07-27-2014, 05:20 PM   #15
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Bad70supreme I'm 100% positive it was same issue. He went through tables that he normally don't go into to find it.
Share with us where the table or problem was found.
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Old 07-27-2014, 06:30 PM   #16
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Car falls on face after about 10ft rolling out

Bfastnotlast the guys from Tickperformance came to track drove my car data logged it and it took him a few minutes because he hasn't went into those tables before . I wouldn't know I will ask him Monday it was somewhere with wheel sensors are
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Old 07-27-2014, 07:28 PM   #17
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Bfastnotlast the guys from Tickperformance came to track drove my car data logged it and it took him a few minutes because he hasn't went into those tables before . I wouldn't know I will ask him Monday it was somewhere with wheel sensors are

Keep us posted as to what it ended up being.
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Old 07-28-2014, 01:06 PM   #18
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This pretty much beats the point of racing with a stick if this is true that the computer messes with you.
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Old 08-05-2014, 08:04 PM   #19
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Anything more?
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Old 08-05-2014, 08:59 PM   #20
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I went to track again this past Sunday. Car is bogging because I'm not leaving hard enough not the computer overriding the throttle anymore . I'm going to freaky Friday in Fayetteville this Friday to test . I'm determined to find that sweet spot of launch rpm and tire pressure . I will let you all know how it goes
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Old 08-06-2014, 09:49 AM   #21
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I went to track again this past Sunday. Car is bogging because I'm not leaving hard enough not the computer overriding the throttle anymore . I'm going to freaky Friday in Fayetteville this Friday to test . I'm determined to find that sweet spot of launch rpm and tire pressure . I will let you all know how it goes

Good to hear. Keep us posted to what you run in the 1/4. Looks like I will have to make the same trip on of these days as Z-max is not doing T&T this year and that is the closest 1/4 mile for me. Still too hot though, going to wait for the cool air to arrive.
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Old 08-06-2014, 09:51 AM   #22
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Are you going to spray it?
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Old 08-06-2014, 10:40 AM   #23
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Yes I am going to spray it. On a 10lb bottle with little purge how many passes can I get in 1/4
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Old 08-06-2014, 10:45 AM   #24
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I would make sure the car works without nitrous first and then spray it. Otherwise to me it's just a waste.

Run wise from a full 10 lb bottle, 4-5 runs?
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Old 08-06-2014, 10:51 AM   #25
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Absolutey I'm gone dial it in on motor. Then I'm going to spray it. A Buddy of mine went to that track he said he got 10 runs in and that was waiting 15min in between each run. So I should be able to find out what works .
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