Made a few passes with Bravado Tribute and MT 305/45/18'S

Discussion in 'SRT Hellcat Wheels and Tires' started by Just4Fun, Jun 6, 2015.

  1. Just4Fun

    Just4Fun Senior Hellcat Member

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    My first time with the Charger at the Drag Strip. I went to Osceola Drag Strip (Northern IN.), they are not know for being the best, it's old and known for being about a tenth slower than a place like Martin (US 131 Motorsports Park). Still a great place and lots of fun, $25 for Friday night Test and Tune, CHEAP fun!!!
    I made 3 passes.... My rims spun in the tires, the right side moved about 18'' total, left side turned about 9''. But, I did not check them after each pass, that's what I found when I got home. Maybe they spun more, who knows. Time for some glue?
    1st. 11.31 at 122 mph, 1.82 60 ft. ( 16 PSI in tires
    2nd. Spun the tires ( did not check tire pressure
    3rd. 11.29 at 122 mph, 1.79 60 ft ( 15 PSI in tires
     
  2. VanishingPoint

    VanishingPoint Silver Member

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    How long were they on the rim? Takes some time to dry the stuff they use to get them on it. Good for you to notice they moved-you may need to re-balance them now too.

    Are you at elevation?
    What was your air like?

    Not to be negative, but 122 seems off by 2-4 MPH in the traps?
     
  3. Just4Fun

    Just4Fun Senior Hellcat Member

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    They have been on the rims 2 days as of now.
    Elevation is 748 feet
    The air was a little thick, I'm not sure what the humidity was, but about 72 degrees.
    I think I would pick up a few MPH at the long end if my 60 foots were better. But I'm with you, I thought 122 was a little off. 125 and 127 seem to be fairly common.
     
  4. paul suloff

    paul suloff Silver Member

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    DA was great at 748 or was that the elevation of the track? Sixties should be in the low 1.60s. Sounds like track prep lacking. Also these cars don't seem to like any brake torqueing. My sixties didn't improve trying to raise RPM against the brake on launch. I have the same tire wheel combo on my Challenger.

    Also reaction to the accelerator seems delayed, car just doesn't go instantly when you mash it?
     
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  5. B5 Blue

    B5 Blue Platinum Member

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    Start at 20 psi 18-20 for DR's
     
  6. VanishingPoint

    VanishingPoint Silver Member

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    I personally always would wait a week or more on fresh installed tires, depending on driving amount, sun, temp etc.

    That would explain it. I think you should just re-balance them, maybe hash mark them next drag to see if they are still spinning?
    And invest in a new driveshaft soon as it is available.

    That "tenth" slower might also cost you a MPH, and the hundred extra ponds of car?
    Were you in Sport (for traction), street (for suspension), track (for shifting)?

    This is supposed to be the hot setup regarding spin, weight transfer, and speed of shifting.
     
  7. Just4Fun

    Just4Fun Senior Hellcat Member

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    I was in Sport with traction control on. I would disable the traction control (hold the button for 5 seconds) for the burn out. Then use all of the traction control in the Sport mode. I heard that the Sport mode was a bit softer on the suspension end, I guess it was supposed to let the car squat or transfer weight to the rear for a better launch.

    I'm lost on the electronics!!!
    I could use lots of help there, I mean kindergarten kind of help!
     
  8. Deputydog

    Deputydog Gold Member

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    I would think you'd want traction completely off but I'm a novice too.
     
  9. bam bam

    bam bam Silver Member

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    most drag racers at the track spray the beads with gumout then mount them and they will stick to the rims like they were vulcanize to them. it really works.
     
  10. wolfmann442

    wolfmann442 Silver Member

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    What about rim screws on the back of the rims?
     
  11. Brauner

    Brauner Hellcat Member

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    did you install tire pressure sensors on the Bravado wheels?
     
  12. Just4Fun

    Just4Fun Senior Hellcat Member

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    I did not. Never even thought about it. What do they cost? Do they have to be programmed to the car?
     
  13. Nycsrt

    Nycsrt BANNED

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    Go to srt pages and set everything to track except suspension sport traction control fully off and car does like foot brake but tires gotta be hot or track prep good if your not cutting 1.6 something is off track prep or the burn out not was long enough for shitty prep to stick
     
  14. Driver72

    Driver72 Gold Member

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    I did the exact same 1.79 60 foot time as you had, and did the exact same 11.3 ET. My DA was 1670 feet however, and my trap speed was 126 mph. I was on the stock Pirelli PZero tires however.
    So everything seems to match up as it should be except the trap speed. 11.3 should yield you 125-126+ mph on the Hellcat.
    Are the trap speeds of most cars on that track slow? If so, I'd bet they need to have their timing lights re-certifiied as they are probably miscalibrated.
     
  15. Driver72

    Driver72 Gold Member

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    Traction control does NOT need to be fully disabled for the 1/4 mile run
    You can have it in sport.
    Sport allows quite a bit of tire spin.

    If you are spinning more than a tiny bit anyway during the run, the run will have bad times, so there is no need to fully disable traction control. Ideally of course, you are launching as hard as you can without the tires losing traction. Same with throttle input. If you mash it down to hard or fast and the rears start to spin, you will not have good time/traps.

    Also do not deflate the tires too much. There is a point where if they are deflated too much you are doing more harm than good on your times.
     

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