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0-60 in 3.7 with a 2.5

Discussion in 'Roadster' started by zack, Apr 1, 2011.

  1. zack

    zack Member

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    How is it done, exactly?
     
  2. benji4

    benji4 Roadster 2.5 #0476

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    #2 benji4, Apr 1, 2011
    Last edited: Apr 1, 2011
    1) Need to have the Sport version of the Roadster
    2) Performance tires
    3) Hard top on the car
    4) No passenger obviously, and driver should be as light as possible (130 lbs. would be good!)
    5) Dry, warm weather
    6) Charge the car fully in performance charge mode, wait an hour or so after done charging
    7) Set drive mode to peformance
    8) Warm the car up with a few practice laps
    9) Turn T/C off
    10) From a stop, depress the accelerator to the floor as quickly as possible without causing the tires to spin, and hold it there until your speed hits 100km/h.

    This should get you close to 3.7 sec. I wish the VDS had a timer for this on it.
     
  3. zack

    zack Member

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    TC on/off?
     
  4. benji4

    benji4 Roadster 2.5 #0476

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    Sorry, forgot! T/C off. Fixed above.... It's a long checklist. I think this is why a lot of car reviews don't hit it.
     
  5. zack

    zack Member

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    I've never tried it, but I've read that when the TC is off and you go full throttle the rear wheels spin uncontrollably.
     
  6. benji4

    benji4 Roadster 2.5 #0476

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    You probably have to test this for yourself... That's the one bit of skill I think it takes in the whole process (other than trying to remember all of those things on the checklist!). If you have T/C on, the computer takes care of the spin problem for you, but it can't do so 100% efficiently and will thus slow down your sprint just a tad -- safely of course. If you have T/C off, then your brain becomes the computer and if it does a perfect job of controlling the acceleration without spinning should be able to beat the car's computer. Less safely of course because people do make mistakes!
     
  7. zack

    zack Member

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    Not quite the same as this quote from you before:

    "10) From a stop, depress the accelerator to the floor and hold it there until your speed hits 100km/h"
     
  8. benji4

    benji4 Roadster 2.5 #0476

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    Not quite -- I'll fix that one too!
     
  9. zack

    zack Member

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    Have you actually gone 0-60 in 3.7s?
     
  10. benji4

    benji4 Roadster 2.5 #0476

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    No, I have a base Roadster unfortunately! Also -- I have normal tires, I don't charge in performance mode, I don't have the hardtop, I'm too heavy (195 lbs.), and the weather has generally been too cold since my car arrived about a month ago. Oh, and I leave T/C on most of the time too. So unfortunately, I'm not a 3.7 sec. candidate.
     
  11. zack

    zack Member

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    Whoever has, I'd like to hear about it.
     
  12. mpt

    mpt Electrics are back

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    I think that you need to pre-load the transmission as well:

    Place left foot on brake to hold car back and depress accelerator to take the tension out of the transmission, release foot brake.

    This allows you to launch with your foot already partially down as well.

    In my classic 2.0 (i.e. non-sport) on regular tires I'm unable to spin the wheels on dry flat tarmac with TC off. It just squats down at the back and voom!
     
  13. vfx

    vfx Well-Known Member

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    Tried that at the drag strip (Irwindale) to no effect.
     
  14. zack

    zack Member

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    How did you achieve your best time, and what was it?
     
  15. vfx

    vfx Well-Known Member

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    A 1.5 and pretty pathetic. I'm not 130 lbs.
     
  16. zack

    zack Member

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    I must be asking the wrong question.
     
  17. TEG

    TEG TMC Moderator

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    As I recall from being at the dragstrip once comparing a bunch of Roadsters:

    • Having TC off makes a slight difference (perhaps .1s)
    • The battery SOC and temp also make a bit of difference, but a bit complicated. (Some things seem to do best when almost overheated.)
    • Holding the brake and accelerator pedal at once and doing a "loaded up launch" is also good for perhaps .1s
    • The weight of the driver definitely makes a difference.

    The 130lb driver with TC off, using the best pedal technique is likely to do about .3s quicker than the 200lb+ driver with TC on, just switching from brake to accelerator.
    In any case, it is all fun. You are just trying to eek out that last tenth.
     
  18. vfx

    vfx Well-Known Member

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    As we have chronicled here before, we found it to be kinda boring after a while. Except for the part of everyone gathering around asking "what is that thing?".
     
  19. zack

    zack Member

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    Is it possible to do a brake stand with a 2.5 by finessing the brake slightly?
     
  20. richkae

    richkae VIN587

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    Turning traction control off makes a huge difference, I feel strongly that it is a lot more than 0.1 second. I will test the next time I have dry roads.
    I never did the two footed start.
    The times were better with a warmer battery.

    From my several times at Portland International Raceway doing drag racing the track conditions make a huge difference - varying the 1/4 mile times of my 2.0 non-sport between 12.9 and 13.3 seconds.
    The runs in the 12.9s correspond to 0-60s a hair under 4.0 seconds according to the log files I pulled. ( Its hard to be sure because the log files only have a resolution of 1 second )
    Of course you want a nice hot and dry track. But a surprising good factor was the diesel club running before us. The big dirty trucks put a lot of rubber onto the track, helping the grip.
     

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