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hints for the 1/4 mile

Discussion in 'Time Slip Data Base - Sponsored by Sydney Dragway' started by 17UCK!, Oct 31, 2010.

  1. 17UCK!

    17UCK! New Member

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    planning on running down the quarter mile soon for the first time. ive got some semi slicks 255s 16s. just wanta know what pressure to put in. and any other tips.

    i got a manual vr ute 355.hp w/ 4.11s

    what revs to stall up to on take off?

    ive also heard people take off in second for better times. should i?

    any other little tips would be great. thanks guys.
     
  2. 17UCK!

    17UCK! New Member

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    any one?.........
     
  3. karlos

    karlos New Member

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    Ill try to answer the questions.

    -Tyre pressure would be around 18psi cold,after the burnout it will have around 20psi in it which is what suits my semis fine.What brand are you using ect?As soon as you see a decent plume of smoke(not see through)get off the brake if on it and slowly stage.Do the skid at the end of the water spray(last foot)as to not wet your guards underneath and having water drip on tyres.This may be able to be done in 2nd(burnout)?

    -Because you have the semis and assuming they are still grippy and not old Im going to suggest 4000 rpm launches with clutch control of some sort,I dont know how your engine behaves or condition of track.Its not a case of in or out,what clutch does it run?

    -Dont take-off in 2nd.

    -Use your handbrake to roll gently into deepstage(1 light on),pull handbrake to stop you,dial up the revs and release clutch/handbrake at the same time if you want to attack the 60ftrs.@ lights if you just want to keep it simple.Its all in when you like to leave when the tree is dropping.As soon as the last yellow is up(I means soon as lol)release the clutch,dont wait for the green:)

    -Dont worry about the person next to you,run your own race.

    -Shiftpoints are critical to ET's,memorize the exact optimum numbers.

    -When you get back go over the vehicle for any abnormalities,check tyre pressures if going back out(2psi less in burnout so it gains to the psi you need)

    -Dont be afraid to experiment with techniques,its a gradual step up usually to the best ET your vehicle can get due to so many variables on the day/s.

    -Have fun and keep hydrated.
     
  4. 17UCK!

    17UCK! New Member

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    thanks mate helps heaps , not sure of the clutch brand but its a heavy duty. the semis are worn but 50% left in them. not sure of the brand ill have to go have a look later.
     
  5. Bz Kn33z

    Bz Kn33z Active Member

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    keep us updated on the times?
     
  6. 17UCK!

    17UCK! New Member

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    yeh mate, wont be for awhile but ill let ya's kno
     
  7. 17UCK!

    17UCK! New Member

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    no1 else has any tips?
     
  8. BradSV8

    BradSV8 Nitrous Junkie

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    You shouldn't use your handbrake if its your first time out, it will only complicate things. Your car will not roll as the track will be flat. Stop your burnout short of the start line and roll up to it slowly until the car is staged. Hold your clutch at the friction point and bring up the RPM as the the lights start. When you launch try different rpms. Start at say 2000 and go up in 500rpm increments till you find out what works the best. Also SLIP the clutch do not drop it, if you drop the clutch the car will never hook up and you will most likely break something. When I say slip the clutch I mean take off like you would in the rain, just a quick slip so the wheels don't spin. This is hard too do but once you work it out you will be very consistant and quick off the start line.
    Also dont worry bout trying to get killer reaction times off the tree. If it is your first time out take your time and concentrate on launching the car it doesn't matter if your reaction is .3 or 2 seconds just concentrate on getting a good 60 foot. You should be aiming for around a 1.7-1.9 sixty foot time depending on track conditions. On a good track you should be able to see these sort of 60 foot times on regular street tyres.
     
  9. 17UCK!

    17UCK! New Member

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    thanks mate. i have alot to practice. i might practice sliping the clutch around the streets a bit first so im ready for the big day lol
     
  10. BradSV8

    BradSV8 Nitrous Junkie

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    Just dont slip it too much driving around otherwise you will fark the clutch. It should only take around a 1/2 a second to a second in the total travel of the pedal the is a fine line between a quick slip and dropping the clutch.
     
  11. eaton v8

    eaton v8 my little sleeper

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    are they drag radials?????
     
  12. wraith

    wraith Hand over the dog bikkies

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    Well considering no one has said it yet I will say my part. Yes these are fairly standard things how ever some times every little bit helps. Make sure your not carrying any excess weight with you. Heck you could go crazy and pull the spare tire and jack out if you wanted and re fit it when your done. Half a tank of fuel could help as well (at a rough guess half a tank is around 30 kilos where as a full tank is around 60 kilos.)

    In the end it's you who will find the optimum shift and launch point's and what work's best. As hard as it may be you shouldn't need to touch red line in a fairly standard commodore.

    Oh and also. No matter what any one says just go at your own pace. If it take's you 10 trips down before you start getting good times then it takes 10 trips.
     
  13. VT-565

    VT-565 New Member

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    As said, take your time.
    You will be nervous as all hell, try and pick a test & tune or street meet to go to, you'll feel a little less under pressure as it is more of a fun atmosphere, even the best of them f**k up from time to time and if so, this is the place and time to do it.

    Now, onto the car.
    Get as much weight out as want, I generally drop the spare, take out all the tools, clean out the centre console & glovebox, take seatcovers and floor mats out. It's free hp, all that **** adds up.
    Make sure your car is serviced well and has no leaks, make sure its as clean as you can get it.
    Since you haven't been out before, I'd say just go and do what feels right in the car, see what times you pull.

    If you are going to change ANYTHING on your car, do one thing at a time or adjust only by a little bit.

    Most importantly, just go and have fun with it.
     
  14. 17UCK!

    17UCK! New Member

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    its a ute so im thinking taking tail gate off, spare tire out, sub out. and run 1/2 tank of fuel. see how that goes. i dont really know what u mean by drag radials but there not street legal, there just for track use ( says on side of the tire ).

    ill goto a test and tune for sure. any1 know how much they are? and how many runs you usually get?

    ive got a fairly big cam, so i think for most power ill have to get to limiter. what gear will i get to over the line? 3rd or 4th? should i stay in 3rd if the lines not far away rather then changing 4th just b4 line?

    thanks every1 for your help so far :)
     
  15. VT-565

    VT-565 New Member

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    Tell us exactly what brand your tyres are, its not recommended you run a bias ply tyre (traditional slicks, Sportsmans etc) with radials (normal street tyres) on the front.
    Most good tracks will pick that up, but you don't want to get caught out trying to run a tyre that isn't permitted.
    Shedding weight is a good idea.
    If you launch off the limiter you will haze your tyres, unless they're good enough to hold, then you'll break the next weakest link.
    Just try driving it off the line for a start and take it up a little each run. You'll soon find the rpm range where you can successfully launch at.
    As far as holding gear, if you need to change, then do it. No good bouncing off the limiter for the last 50 metres of the track, remember, if you punch the next gear, it will get you going that little bit quicker.
    The street meets in T'ville are usually $30 and you need closed in shoes, long pants, long sleeve shirt and an approved helmet.
    Townsville is not ANDRA affiliated, so meets at your track could be a little bit tighter on scrutineering.

    Have fun with it.
     
  16. wraith

    wraith Hand over the dog bikkies

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    Leave the tail gate on. Mythbusters proved taking it off does nothing.
     
  17. VT-565

    VT-565 New Member

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    If he doesnt have a hard cover (which should come off as well) then removing the tailgate is more of a weight saving than an aerodynamic improvement
     
  18. karlos

    karlos New Member

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    If its a "true" street car then stay in street trim imo.

    lol,yeah leave the gate on.
     
  19. wraith

    wraith Hand over the dog bikkies

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    Leaving the tail gate up negates any weight penalty you may have as there is better aerodynamics with it up and it also helps to push the rear of the car down.
     
  20. 17UCK!

    17UCK! New Member

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    well i might have to try a few runs with it off and on. :D see how it goes.
     

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