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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Why are injectors measured in impedence and not resistance??
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Fri, 17 October 2003 00:21
 
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for something that is just 'on' resistance is often a decent enough measurement.
impedance is more like a measure of dynamic resistance...
hmm, to put it in car terms. think of free-revving a motor
resistance would be the internal friction that slows the engine down, and stops it revvign quickly.
impedance is more like the flywheel, as you have to put energy into over coming it's inertial impedance to get the motor revving.
for injectors, even tho two injectors may have the same resistance, the impedance may be much larger in injectors with large coils. this results in more power being needed to get them moving, as you have more 'impedance/inertia' to overcome.
a good example is the massive TBI injectors used on US V8's. these things are huge, and have very large impedance compared to say, MPI denso's. althought he may have same resistance, you need higher ampage to get them to initially get going (for low Z, PWM, peak and hold type injectors), but then similar power to keep them open. when they close, there is also more 'flyback' which is basically the power you put in, kicking back as the solenoid goes back thru the coil....
at least i think that's how it works 
something about inducing a field then moving something thru it, and sort of regenerating fields and current and shit 
Cya, Stewart
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| | Subject | Poster | Date |
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Why are injectors measured in impedence and not resistance??
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gabe | Thu, 16 October 2003 15:11 |
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Re: Why are injectors measured in impedence and not resistance??
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Cool1 | Thu, 16 October 2003 20:54 |
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Re: Why are injectors measured in impedence and not resistance??
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SXer | Thu, 16 October 2003 22:12 |
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Re: Why are injectors measured in impedence and not resistance??
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mrshin | Thu, 16 October 2003 23:10 |
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Re: Why are injectors measured in impedence and not resistance??
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gabe | Thu, 16 October 2003 23:29 |
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Re: Why are injectors measured in impedence and not resistance??
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Norbie | Thu, 16 October 2003 23:34 |
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Re: Why are injectors measured in impedence and not resistance??
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gianttomato | Thu, 16 October 2003 23:57 |
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Re: Why are injectors measured in impedence and not resistance??
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KDog | Fri, 17 October 2003 00:02 |
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Re: Why are injectors measured in impedence and not resistance??
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oldcorollas | Fri, 17 October 2003 00:21 |
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Re: Why are injectors measured in impedence and not resistance??
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mrshin | Fri, 17 October 2003 02:19 |
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Re: Why are injectors measured in impedence and not resistance??
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oldcorollas | Fri, 17 October 2003 02:28 |
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Re: Why are injectors measured in impedence and not resistance??
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KDog | Fri, 17 October 2003 03:09 |
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Re: Why are injectors measured in impedence and not resistance??
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mrshin | Fri, 17 October 2003 04:09 |
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Re: Why are injectors measured in impedence and not resistance??
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gabe | Fri, 17 October 2003 04:35 |
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Re: Why are injectors measured in impedence and not resistance??
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THE WITZL | Fri, 17 October 2003 09:14 |
