VTEC question

Discussion in 'Gearhead Garage' started by hans5849, Mar 26, 2005.

  1. hans5849

    hans5849 Serious as a heart attack

    Messages:
    10,204
    Trophy Points:
    63
    Location:
    Manama, Bahrain
    Wtf does Vtech mean anyways and what are the different implemntations of it.
  2. Dustin

    Dustin Junior Member

    Messages:
    2,731
    Trophy Points:
    53
    Location:
    BC, Canada
    It's Variable valve Timing and lift Electronic Control. It's a system that basically changes the cam profile on the fly, creating higher valve lift and cam duration at a certian set RPM/range to create more power.

    It's almost the same as adding a more agressive cam to the motor, but it's only activated at certian times, which makes it easy to get good fuel economy and also build power at the same time
  3. BrentN

    BrentN Banned

    Messages:
    2,320
    Trophy Points:
    0
    Location:
    Calgary Alberta
    I thought that it would only use half the valves on a DOHC until a particular rpm point, in wich it opens all of them for more power?

    I had no idea that it actually controlls the lift of the valve, thats pretty neat. How is this possible with the camshaft? does it somehow move the camshaft closer to the vaves to give them more lift or what?
  4. El_Presidente_Pufferfish

    El_Presidente_Pufferfish I grew up here

    Messages:
    1,082
    Trophy Points:
    53
    Location:
    Seattle
  5. hans5849

    hans5849 Serious as a heart attack

    Messages:
    10,204
    Trophy Points:
    63
    Location:
    Manama, Bahrain
    im smarter now, thanks guys
  6. Alex B

    Alex B Junior Member

    Messages:
    644
    Trophy Points:
    31
    Location:
    Los Angeles
    ok, just so you know about vtec:

    Yes, vtec is cleverly implemented
    Yes, it's a very good system that works well
    Yes, vtec (set up right) enables you to rev higher than with a conventional valvetrain

    NO, vtec is not the end-all be-all solution
    NO, honda did not invent variable valve timing
    NO, adding vtec alone will not add more power than a turbo alone (ask if you need clarification)
    NO, having a stock vtec engine will not enable you to beat muscle cars
    NO, vtec will not make your penis larger

    im sorry, it's just that many so called "import tuners" jizz their panties when they talk about vtec. it's good, but not all it's cracked up to be...
  7. shrugs*

    shrugs* New Member

    Messages:
    817
    Trophy Points:
    0
    Location:
    Toronto, ON
    lies.
  8. Phant0m51

    Phant0m51 From Utah, NOT mormon

    Messages:
    2,418
    Trophy Points:
    53
    Location:
    Utah, USA
    vtec, as it is implemented currently, is fairly limited. You have to reach a certain RPM to get the most out of the engine.

    This is why I'm looking into designing the first ICVTEC (Infinitely Changing Variable Valve and Lift Electronic Control). No more camshafts.

    Of course, I don't know if it will work as I haven't built it yet, but My wife just got herself a J O B and we have an extra $800 a month. I need about $400 to design and build it, and then another $500 to actually implement it into a car (not including the motor). I'll see if she'll let me do it.
  9. Dustin

    Dustin Junior Member

    Messages:
    2,731
    Trophy Points:
    53
    Location:
    BC, Canada
    Which was the point of the design in the first place! :)
  10. Jackalope

    Jackalope NNNNEEERRRRDDDSSSSS!!!!!!

    Messages:
    6,504
    Trophy Points:
    63
    Location:
    Clute, Tx
    hmm icvtec.

    kinda reminds me of an idea I had, but I was wondering if ti woukd even be possible to implement.

    imagine instead of cams and valve springs, using electronic silynoids(sic) to actuate valve movement. the only problems I can find are 1. heat and 2. finding a silynoid(sic) that can actuate fast enough

    the only other problem would be of course mapping everything. Mapping an absolutely perfect profile for every RPM and condition would be a very very tough job to do. I mean, sure you could work off existing cam profiles, but even working off of those you would have a hellofa job w/ all the variables involved.
  11. hans5849

    hans5849 Serious as a heart attack

    Messages:
    10,204
    Trophy Points:
    63
    Location:
    Manama, Bahrain
    will adding a body kit make my car go faster? j/k
    my penis is big enough all ready, epenis could use some enlarging though
    Im not going to add a turbo unless i have a second car
  12. integra00

    integra00 Junior Member

    Messages:
    2,515
    Trophy Points:
    53
    Location:
    Starting a small fire in ur moms panties
    some guy comes into home depot yesterday with one of those knock off mercedes blinker in the mirror thing... and i asked about the fitment on his car hes like yea it fits good. i have a 94 civic has vtec and some other stuff i added.
  13. hans5849

    hans5849 Serious as a heart attack

    Messages:
    10,204
    Trophy Points:
    63
    Location:
    Manama, Bahrain
    Little bump here.

    At work the mexicans think they are gods when it comes to hondas. One of the other drivers there drives this POS 80's Honda. They asked me if i thought i could beat it; when i said maybe they said that it was Vtec so i couldn't. WTF if my engine produces more horsepower (which it does) and i don't fuck up on my shifts i could beat him.

    Then the other day i was talking with this guy about our cars, and im like yea mines a F22A but i want to put a F22b1 to get rid of my engine problems. He had no idea what i was talking about, so i asked him what motor he had. He responded with i have the engine from a Civic Si, and i asked him what motor that was and he had no idea.

    Now i understand your guys comments.
  14. offroadin

    offroadin New Member

    Messages:
    377
    Trophy Points:
    0
    The Solenoid idea isn't going to happen until you invent solenoids that can cycle like 100 times per second as well as having feedback so the computer knows where it is at (to adjust lift and timing).

    An idea I had would be to have the camshaft isolated from the engine RPM and run by a separate computer controlled electic motor. That way the cam timing could be retarded and advances, as well as have variable advance curves.

    NObody steal my idea. Its not patented.... yet...
  15. Dustin

    Dustin Junior Member

    Messages:
    2,731
    Trophy Points:
    53
    Location:
    BC, Canada
    It's already been done as far as I know.. but not reliable or very efficent yet
  16. offroadin

    offroadin New Member

    Messages:
    377
    Trophy Points:
    0
    Show me, i'd be interested to see what problems they ran into.
  17. Dustin

    Dustin Junior Member

    Messages:
    2,731
    Trophy Points:
    53
    Location:
    BC, Canada
    I think it was in one of those 'tuner' mags... I was reading it a while ago

    I dunno if I can find the article online. I think it was being developed for the future of F1?
  18. Jackalope

    Jackalope NNNNEEERRRRDDDSSSSS!!!!!!

    Messages:
    6,504
    Trophy Points:
    63
    Location:
    Clute, Tx
    i think somethign thats more impressive than changing the way the engine revs, is an idea that changes how the power gets to the ground.

    a Continuously Variable Transmission.

    It uses a series of pulleys and belts that constantly change and shift as speeds get higher. Basically what it will do is put a load on your engine, say at max torque. The CVT actually changes the gear ratio infinitely as you drive, making sure you are always in peak power. Its a really a hella cool concept, but they are having problems implementing it. As it stands now, the CVT can't take too much power, and its very complicated.
  19. Dustin

    Dustin Junior Member

    Messages:
    2,731
    Trophy Points:
    53
    Location:
    BC, Canada
    Yeah CVT is in the Nissan Murano and I gotta say it's really impressive. I love driving them with the CVT, very smooth
  20. integra00

    integra00 Junior Member

    Messages:
    2,515
    Trophy Points:
    53
    Location:
    Starting a small fire in ur moms panties
    didnt they also put a cvt into an audi tt i thought i saw it on that show with the british guy.
  21. offroadin

    offroadin New Member

    Messages:
    377
    Trophy Points:
    0
    I don't know about infinitely variable, but this idea has been used on snowmobiles and more recently quads for a long time. Some of the racing snowmobiles are making upwards of 150HP with 800cc 2 strokes so I don't think power handling is a problem.

    The main problem I see is having to overhaul the CVT systems, changing belts springs and whatnot.
  22. crappo

    crappo New Member

    Messages:
    78
    Trophy Points:
    0
    Location:
    Waterloo, Ontario
    are you thinking of that dual clutch technology audi has?
  23. integra00

    integra00 Junior Member

    Messages:
    2,515
    Trophy Points:
    53
    Location:
    Starting a small fire in ur moms panties
    crappo, yep i think thats what i was thinking about.