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Forced Reving

Discussion in 'Racing and Driving Techniques' started by Sergey P.A., Dec 9, 2003.

  1. Sergey P.A.

    Sergey P.A. Senior Member

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    ok, I am talking about the downshifting you use to make your car go slower, so is that good bad, and why?

    because I spoke with one guy and he said that when you use downshifting to make you car slower, something like Forced Reving happens=you force your engine to rev.

    and he said that this is very bad on you engine= Not on tranny,

    and considering that I have a stock 2001 GSR with only 3,000 miles on it, should I wait till I have about 5g's on the engine than race and rev it up, or I can do it right know,

    //
     
  2. highperboi

    highperboi Senior Member

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    dont downshift to slow your car down. thats what your brakes are for.
     
  3. CRX_B16B

    CRX_B16B Senior Member

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    I think you tires would break free b4 hurting any thing in your engine but still
     
  4. pills_PMD

    pills_PMD Super Moderator

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    your tires dont have time to break free when you force the car into a gear lower than it should be in.. you just get a maddd high rev... and that leads to floating valves...
     
  5. cointelpro

    cointelpro Senior Member

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    learn how to double clutch... and learn when you can and cant downshift so that when you double clutch your rpms wont be more than they should be. :moon:
     
  6. highperboi

    highperboi Senior Member

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    rpm matching and double clutching arnt for slowing down tho... more for turning
     
  7. simplyfast

    simplyfast Senior Member

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    i call bullshit highberboi...when you are heel/driving you use the engine to help slow you down also. you are pressin the brake while you are double clutchin, using the engine to help the brakes out.

    when you just drop a gear w/o matchin revs, you are causing every shaft in your engine to exert a mean vibration that will fuck up the bearing surfaces.
     
  8. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    i race road course

    the BRAKES are for slowing the car

    the ONLY time you use the engine to slow the car is if you only need to slow a little by lifting off the gas for a second

    you NEVER down shift to slow the car

    heel toe braking is strictly about keeping the car smooth through the corner (the smoother you are through the corner the faster you can take the corner)
     
  9. Sergey P.A.

    Sergey P.A. Senior Member

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    so what about forced revvvvvvvvvvvvving, is this shit really bad....
     
  10. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    its not a good idea

    its not going to instantly kill the engine

    it does put added stress on it though

    you are putting yourself at higher risk of over reving and blowing your engine

    just use your brakes ... thats what they are there for
     
  11. Sergey P.A.

    Sergey P.A. Senior Member

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    what about downshifting in order to make the car slower lets say on the flash lights, I am hot talking about the high reving, jest you know daily driver thing, is this safe...
     
  12. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    sure
    do it up

    its still not "good" for the engine... but at lower RPMs the stress will be lower
     
  13. Sergey P.A.

    Sergey P.A. Senior Member

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  14. simplyfast

    simplyfast Senior Member

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    solsi, who told you not to use the engine to help slow you down?
     
  15. Sergey P.A.

    Sergey P.A. Senior Member

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    simplyfast that's what I said too,

    but I don't know,

    I heard allot of people for and against it...
     
  16. jamesA

    jamesA Well known pissed off telephone guy VIP

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    :blink: Every other person ever talking about this has said the exact opposite. The 60 year old hotrodder car guy, my brother, my dad, the mechanic I used to go to, etc.

    Honestly, I don't understand how you're going to hurt your engine that bad by downshifting from 4th to 3rd and only jumping the rpms up by 1100 from 3000 rpm. For that sake, downshifting to floor it would do the same thing, only worse because you're going to end up revving it higher when it gets into a lower gear.


    Basically anything you do to your engine will hurt it when it's moving.
     
  17. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    EVERY instructor ive ever had

    using the engine to slow you by staying in gear and lifting off the throttle :thumbsup:

    using the engine to slow you by shifting to a lower gear :thumbsdown:
     
  18. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    at low RPMs like you are talking about it isnt going to matter .... i already said that

    on the street at low RPMs go ahead and do whatever you want
    its not the best practice to get yourself into though
     
  19. B16

    B16 Super Moderator VIP

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    :werd:
    i can vouch for that with over a year of road course experience.

    also, what is cheaper to replace? clutch, tranny, engine internals? or brake pads and rotors? which is cheaper?
     
  20. jiahanhao

    jiahanhao Senior Member

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    :werd:

    I have a friend who makes a habit of always engine braking like crazy. He's on his 3rd engine now (3sgte to boot), and still doesn't get why his oil seals/valvetrain/whatever keeps going bad. He is one :fr:
     
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