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I took my car to the track. Help me analyze my passes.

Discussion in 'RT/10 and GTS Discussions' started by heath1225, May 18, 2014.

  1. heath1225

    heath1225 Viper Owner

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    OK, here is the set up:
    1997 GTS Hennessey Venom 500
    (headers, exhaust, smooth tubes, 3.55 gear)
    Stock rims with Toyo Proxes TQ drag radials @ 15 psi (345/40/17)

    I dont have my time slips with me at the moment, but my best passes were all very similar.

    1/4-
    11.8s @ 121.5-123 mph

    1/8-
    7.85-7.95 @ 94-95 mph

    60 ft 1.95-2.05

    My three best passes were 11.86, 11.87, and 11.89.

    I know my 60 ft is terrible, but I figured I would trap higher in the 1/8 than I did. I tried everything to improve my 60 ft. I launched higher, I launched lower, I bogged, I hazed, I slipped. Still all above 1.9.

    I was still impressed by my trap speed and my ultimate goal was to get in the 11s. I guess it was mission accomplished.

    So, what can you tell me about my passes? What does my trap in the 1/4 tell me? What about the 1/8? I thought my 1/8 trap would be around 100, so thats one thing i want to know for sure.

    thanks!
     
  2. Viper98912

    Viper98912 Enthusiast

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    I'm impressed. Very close passes overall, and great times for not being super or turbocharged. Drag radials probably helped a lot too. My stock GTS ran 12.7 at VOI12 @ 117 mph.

    Not the answer you were looking for, but some kudos.
     
  3. heath1225

    heath1225 Viper Owner

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    The drag radials didn't help me as much as I would have liked, considering my 60 ft sucked. But I think it was more in my launch technique than tires.
     
  4. 7TH_SIGN

    7TH_SIGN Enthusiast

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    60ft is definitely slowing your times. Hard to tell why without a in car video. Are you shifting fast and at the correct rpm?
     
  5. heath1225

    heath1225 Viper Owner

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    I am shifting quickly, but might be at too high of an rpm. I am shifting around 6k. Also, on my launch, I bogged down nearly every pass. I think I wasn't giving it enough throttle as I slipped the clutch.
     
  6. Camfab

    Camfab Viper Owner

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    First off make sure you heat the tires up, then hold the rpm somewhere around 3500. It's going to depend on traction but the rpm you launch at will vary a bit. I let the clutch out relatively quickly without much slippage. If you've heated the tires and you've given it the right amount of rpm you'll launch somewhere in the 1.8s or better. Great times and very good mile an hour for a relatively stock car.

    If your clutch is slipping, it's time for a new clutch. My stock clutch holds strong for a modified engine.
     
    Last edited: May 18, 2014
  7. heath1225

    heath1225 Viper Owner

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    My clutch is still good. My tires should have been heated just fine. I think I didn't give it enough throttle when in slipped my clutch on launch, thus it bogged down.
     
  8. viper k

    viper k Viper Owner

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    thats good i have a 1996 gts with 355 and exhaust no headers darg radials 60 foot time 1.6591 1/8 mile 7.4935 @94 mph 1/4 mile 11.6277 @121 mph !!
     
  9. heath1225

    heath1225 Viper Owner

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    viper k- great run!
     
  10. viper k

    viper k Viper Owner

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    thank you heath!!!
     
  11. viper k

    viper k Viper Owner

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    heath if you get your 60 ft time down you will be running 11.50 with on problem!!!! you have a fast street car!!!
     
  12. heath1225

    heath1225 Viper Owner

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    I know. I think my problem is I am used to launching on the street and I am too easy on the gas. I wasnt giving it enough throttle as I let the clutch out and it bogged down. I will try again next time!
     
  13. Camfab

    Camfab Viper Owner

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    Exactly what I said, but you stated you tried everything and that you either bogged or hazed or slipped. Thus you either didn't give it enough rpm at launch, didn't heat the tires properly, or your clutch is giving out. You stated your issues, not me.
     
  14. Chuck 98 RT/10

    Chuck 98 RT/10 Enthusiast

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    For compare my bone stock 98 RT/10 best run is 12.05 with 60' times about the same as yours.
     
  15. SRToad4

    SRToad4 Enthusiast

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    Awesome runs, 11.8 @ 123 for just exhaust work and some gears is awesome.
     
  16. heath1225

    heath1225 Viper Owner

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    Cam- regardless, my 60 ft sucked and I need to fix it. Haha.
     
  17. heath1225

    heath1225 Viper Owner

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    I just need more practice.
     
  18. WANTED

    WANTED Viper Owner

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    try coming out at 2500rpm,slip the clutch a little then floor it never take the pedal off the floor. also learn how to speed shift. with stock tires just spin them to clean, no burnout. i ran 11.46 stock 2002 rt/10, check dragtimes.com
     
  19. heath1225

    heath1225 Viper Owner

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    Wow. Awesome time. What was your 60 and trap?
     
  20. Chuck 98 RT/10

    Chuck 98 RT/10 Enthusiast

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    Everybody is being nice. Yes, your 60 ft times are horrid for drag radials. If you have a 1/8 nearby jump on it and don't leave until you figure it out. I've made as many as 50 1/4 mile passes during a single Vipers only track day.

    You might have too much gear also.

    Just being honest.

    BTW I don't slip the clutch. It is true there can be a .1 or more if you do but it isn't worth it to me. I got 130,000 miles out of my stocker before changing it.
     
  21. heath1225

    heath1225 Viper Owner

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    Chuck- I need honesty, not sugar coating. lol Do you just dump the clutch? What RPM?
     
  22. WANTED

    WANTED Viper Owner

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    ok im getting old heres the correct time with 60', 1/8 with mph, 1/4 with mph

    60' - 1.68
    1/8 - 7.394 , 94.68 mph
    1/4 - 11.514 , 120.020 mph
     
  23. WANTED

    WANTED Viper Owner

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    above run april 26,2006
    9:00 pm
    temp 49
    humidity 29
    baro 28.94

    here are some times 2 weeks prior when i was running trophy class april 9, 2006
    temp 53
    humidity 29
    baro 29.15

    i'll also post dialed in ET and what i ran

    1:18 pm
    dial - 11.70 /
     
  24. WANTED

    WANTED Viper Owner

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    correct dial was 11.55
    ran - 11.599
    60' - 1.705
    1/8 - 7.497 / 95.58 mph
    1/4 - 11.599 / 121.18

    3:19 pm
    dial - 11.55
    ran - 11.583
    60' - 1.688
    1/8 - 7.479 / 95.20 mph
    1/4 - 11.583 / 120.90 mph

    now best run ever running my posted dialed in time

    dialed in at 11.55 and ran 11.554

    5:48 pm

    60' - 1.702
    1/8 - 7.481 / 95.88 mph
    1/4 - 11.554 / 122.14 mph
     
  25. Chuck 98 RT/10

    Chuck 98 RT/10 Enthusiast

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    I don't slide my foot off it but I engage it quickly. I guess you could say instead of feathering the clutch I feather the gas. It has been a few years but if I recall correctly 3K was where I would start and then go higher or lower depending on conditions. Keep in mind I run stock. Not sure what you should launch with a 3.55 and drag radials. Tire pressure matters too. Fiddle with that a bit.
     
  26. heath1225

    heath1225 Viper Owner

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    I went back to the track tonight. 11.63 @121 with a 1.65 60ft. Slipped the clutch quickly and hammered the throttle. I launched at about 4k.
     
  27. Chuck 98 RT/10

    Chuck 98 RT/10 Enthusiast

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    Good job. That's where you should be with your setup.
     
  28. Camfab

    Camfab Viper Owner

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    Now your kick'n some butt! Great job.
     
  29. heath1225

    heath1225 Viper Owner

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    I was really happy with my passes. It has more in it though. The DA was 2700.
     
  30. WANTED

    WANTED Viper Owner

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    awesome run ! you might want to try 24psi rear tires and 40 psi front. looking forward to your next runs. can you post your 1/8 times and speed plus time of day your running.
     

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