SM4 has cheapo resistors used to cut voltage to injectors

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 12.9 ( 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.
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TE Chea wrote:

www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/f2/4b/0900823d800cf24b.jsp
you're out of your mind chea. go see your doctor.
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www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/f2/4b/0900823d800cf24b.jsp
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
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On Tue, 7 Aug 2007 10:16:07 -0700, "Michael Pardee"

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.
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www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/0c/f2/4b/0900823d800cf24b.jsp
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
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| 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 3 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.
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HA HA HA HA HA HA! That's the funniest thing I've read in WEEKS!
--Gene
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