SM4 has cheapo resistors used to cut voltage to injectors

Discussion in 'General Motoring' started by TE Chea, Aug 7, 2007.

  1. TE Chea

    TE Chea Guest

    Mine have resistance of 5.6 ohm, injectors - 2.1 ohm, ratio is
    8 : 3, when max 12.9v flows through both, # of watts wasted as
    heat is 12.9² ÷ ( 5.6 + 2.1 ) x 8 ÷11 = 15.71w.
    www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/f2/4b/0900823d800cf24b.jsp
    A buck*converter ( costlier but far more efficient )
    http://en.wikipedia.org/wiki/Buck_converter should have been
    used instead ( as used on pc's mboard, for cpu ). Tandy's 1984
    catalogue already had 2 * ( part # 14-844 & 270-1560 ) for sale
    .. If fitted with ECU in boot, a * will not get too much heat, i.e.
    will last long ( like those on mboards ).
    Battery & spark plugs will get more amperes : easier start, less
    sulfation of battery ( from higher charge ), less exhaust noise (
    from bigger sparks ), more torque & mpg.

    SM4's short 4-1 exhaust manifold & steel wheels are cheapos
    too.
     
    TE Chea, Aug 7, 2007
    #1
  2. TE Chea

    jim beam Guest

    you're out of your mind chea. go see your doctor.
     
    jim beam, Aug 7, 2007
    #2
  3. TE Chea

    jim beam Guest

    you're out of your mind chea. go see your doctor.
     
    jim beam, Aug 7, 2007
    #3
  4. Resistors are the best way to go. The power dissipation is variable but is
    always much less than your calculations because the injectors are energized
    a small part of the time (low duty cycle.) Same with the power consumption;
    if the duty cycle is 5% the total average power is around a watt.

    The resistors don't produce a constant voltage on the injectors, but serve
    as ballast instead. The injectors are very inductive so the full 12 volts is
    initially applied across the injector. As the injector current builds up and
    the injector is just being held open more voltage is dropped across the
    resistor to prevent cooking the injector. I don't know of any manufacturer
    that uses anything other than resistors when using ballasted injectors.

    Mike
     
    Michael Pardee, Aug 7, 2007
    #4
  5. Resistors are the best way to go. The power dissipation is variable but is
    always much less than your calculations because the injectors are energized
    a small part of the time (low duty cycle.) Same with the power consumption;
    if the duty cycle is 5% the total average power is around a watt.

    The resistors don't produce a constant voltage on the injectors, but serve
    as ballast instead. The injectors are very inductive so the full 12 volts is
    initially applied across the injector. As the injector current builds up and
    the injector is just being held open more voltage is dropped across the
    resistor to prevent cooking the injector. I don't know of any manufacturer
    that uses anything other than resistors when using ballasted injectors.

    Mike
     
    Michael Pardee, Aug 7, 2007
    #5
  6. Pardon me, but a buck converter isn't quite a simple in real life, as
    opposed to Wikipedia. A high power buck converter requires a bunch of
    passives (resistors, capacitors, and inductors), and is not cheap,
    especially in automotive temperature grades.
    They're also NOT instantaneous in operation, and don't like to have
    their supply turned on & off thousands of times per minute.
    They also dissipate heat (they're "bucking" the incoming power supply),
    which needs to go somewhere.

    Why don't you just switch to a carburated engine, like an '89 Ford
    Fiesta, to go along with your '84 Radio Shack catalog? They don't need
    those power-robbing fuel injectors anyway...

    --Gene
     
    Gene S. Berkowitz, Aug 10, 2007
    #6
  7. Pardon me, but a buck converter isn't quite a simple in real life, as
    opposed to Wikipedia. A high power buck converter requires a bunch of
    passives (resistors, capacitors, and inductors), and is not cheap,
    especially in automotive temperature grades.
    They're also NOT instantaneous in operation, and don't like to have
    their supply turned on & off thousands of times per minute.
    They also dissipate heat (they're "bucking" the incoming power supply),
    which needs to go somewhere.

    Why don't you just switch to a carburated engine, like an '89 Ford
    Fiesta, to go along with your '84 Radio Shack catalog? They don't need
    those power-robbing fuel injectors anyway...

    --Gene
     
    Gene S. Berkowitz, Aug 10, 2007
    #7
  8. You have to understand that the Chia Pet's feelings about watts are
    like General Jack D. Ripper's feelings about precious bodily fluids.
    To waste them is a sin even if they are abundant. Chia will not have
    an electric clock in his car. He claims that they stress the
    electrical system, but I think he just can't sleep at night with the
    thought of the constant, unrelenting drip-drip-drip of milliamp after
    milliamp being lost forever.
     
    Gordon McGrew, Aug 10, 2007
    #8
  9. You have to understand that the Chia Pet's feelings about watts are
    like General Jack D. Ripper's feelings about precious bodily fluids.
    To waste them is a sin even if they are abundant. Chia will not have
    an electric clock in his car. He claims that they stress the
    electrical system, but I think he just can't sleep at night with the
    thought of the constant, unrelenting drip-drip-drip of milliamp after
    milliamp being lost forever.
     
    Gordon McGrew, Aug 10, 2007
    #9
  10. TE Chea

    TE Chea Guest

    | a buck converter isn't quite a simple in real life, as
    | opposed to Wikipedia.
    Wiki 's pages are written by PhD`s, you have a PhD in
    electronics ?

    | is not cheap
    Here, 1 can buy a new 3½ amp b-c for M$55 =~US$15.71, who
    in this NG cannot afford this ?

    | especially in automotive temperature grades.
    no need to fit under bonnet, twit

    | They're also NOT instantaneous in operation, and don't like to have
    | their supply turned on & off thousands of times per minute.
    Bullshit & irrelevant ; F20A's injectors® get a +ve voltage
    whenever ignition switch is on, ECU controls ®' -ve ground.
    www.autozone.com/images/cds/gif/large/0900823d800d0ddd.gif
    I already can replace F20A's resistors,
    www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0d/08/7c/0900823d800d087c.jsp
    with lithium battery(s), a b-c as a charger, & diodes. Trial result
    is good : noise, alternator & engine's heat, idle rpm, all
    dropped ~30%, battery's charge rose >10% www.batteryfaq.org .

    | They also dissipate heat (they're "bucking" the incoming power supply),
    | which needs to go somewhere.
    How much heat does a pc mboard's*b-c produce ? * processes
    10-20x as many amps yet heat cannot even be felt by hand.

    | Why don't you just switch to a carburated engine
    No 4ws. Incredible is how thick-skin salesmen & women are in
    these NG`s.
     
    TE Chea, Sep 6, 2007
    #10
  11. TE Chea

    TE Chea Guest

    | a buck converter isn't quite a simple in real life, as
    | opposed to Wikipedia.
    Wiki 's pages are written by PhD`s, you have a PhD in
    electronics ?

    | is not cheap
    Here, 1 can buy a new 3½ amp b-c for M$55 =~US$15.71, who
    in this NG cannot afford this ?

    | especially in automotive temperature grades.
    no need to fit under bonnet, twit

    | They're also NOT instantaneous in operation, and don't like to have
    | their supply turned on & off thousands of times per minute.
    Bullshit & irrelevant ; F20A's injectors® get a +ve voltage
    whenever ignition switch is on, ECU controls ®' -ve ground.
    www.autozone.com/images/cds/gif/large/0900823d800d0ddd.gif
    I already can replace F20A's resistors,
    www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0d/08/7c/0900823d800d087c.jsp
    with lithium battery(s), a b-c as a charger, & diodes. Trial result
    is good : noise, alternator & engine's heat, idle rpm, all
    dropped ~30%, battery's charge rose >10% www.batteryfaq.org .

    | They also dissipate heat (they're "bucking" the incoming power supply),
    | which needs to go somewhere.
    How much heat does a pc mboard's*b-c produce ? * processes
    10-20x as many amps yet heat cannot even be felt by hand.

    | Why don't you just switch to a carburated engine
    No 4ws. Incredible is how thick-skin salesmen & women are in
    these NG`s.
     
    TE Chea, Sep 6, 2007
    #11
  12. HA HA HA HA HA HA!
    That's the funniest thing I've read in WEEKS!

    --Gene
     
    Gene S. Berkowitz, Sep 8, 2007
    #12
  13. HA HA HA HA HA HA!
    That's the funniest thing I've read in WEEKS!

    --Gene
     
    Gene S. Berkowitz, Sep 8, 2007
    #13
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