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Location:
Adelaide
Registered:
May 2003
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Engine Electrics (Amperage Draw)
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Mon, 16 May 2005 08:40
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Alright just a quicky. Ive been doing some calculations for a little thing im doing, and just wanted to doublecheck them with others.
Mainly on the injector side of things. I figure the current draw for most low amperage injectors to be around 0.5A and that high impedence will be even less. Thats going by some of the Edelbrock and other carby>EFI conversion docs ive found around the place.
Second is im thinking that the ignitor trigger wire would be a decent amount less than 2A to trigger.
Basically im hoping pretty much everything in the engine bay (sensors, injectors, and ignitor triggers) will run off less than 2A each.
Care to confirm or share?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Engine Electrics (Amperage Draw)
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Mon, 16 May 2005 08:48
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Measure the resistance, work it out.
V = Ri
13.8volts = 2.7ohm x i
i = 13.8/2.7 = 5amps per low impedance injector.
13.8volts = 13.8ohm x i
i = 13.8/13.8 = 1amps per hi impedance injector
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Engine Electrics (Amperage Draw)
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Mon, 16 May 2005 08:58
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yup, bu tbear in mind that the low impedance will use (you would hope) peak'n'hold, so the average current draw will also be around 1 amp.. add to that for both types the length of pulse, and average current may be around 0.5amps.. better to over engineer to sayy 2amps each, than have an injector fuse blow 
most sesnors etc have little current draw, but not sure about igniter trigger? you mean the power to the ignitor itself (small)? or the current drawn by the coil thru the ignitor(large)?
i think i put most things on 5amp fuses, with the exception of lights, fans, pumps, coil, and anything else big i forgot. injectors were coupled with O2 sensor (5amp max draw) on a 10 amp fuse.
Cya, Stewart
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Location:
Brisbane
Registered:
February 2003
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Re: Engine Electrics (Amperage Draw)
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Mon, 16 May 2005 12:48
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coils can suck fair wack of current - maybe look at what fuses are in the engine bay and kick panel of EFI that the motor came out of and us that as reference.
fwiw: i was going to put a 30 amp fuses in the power feed to all of the EFI gear then after that 2 separate fuses for the ignition and fueling sides (e.g feed to coils, feed to injectors). Fuel pump has own fuse - before a relay that's controlled by the ECU.
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Location:
Adelaide
Registered:
May 2003
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Re: Engine Electrics (Amperage Draw)
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Mon, 16 May 2005 13:42
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Im trying to figure it out so i can use a quick connect for the entire engine loom, in order to simplify the Haltech wiring loom. The wire which the quick connect has should be around the 10A mark, but what normally flows down it is around 2A or so, so i know that thats the nominal max.
Im using Coil over Plug packs and as such there are 3 connectors on the coil/igniter. Power, ground, signal. The power and ground would be a 30A rail shared between 4 coils/igniter combos. While im hoping that the signal can be passed along the quick connect.
Currently its looking like i can use the quick connect for everything bar the major power supplies. I.e. coil power and ground. Which i will be able to use a seperate 2pin nylon 30A connector for as detailed above.
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