What 10k ohm resistor are you guys using for the holley ethanol sensor?
#1
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What 10k ohm resistor are you guys using for the holley ethanol sensor?
Im wiring up the ethanol sensor on my holley. Says I need a 10k ohm resistor. I couldnt find examples people are using. Went to a radio store and asked for one. He asked me what wattage I needed. I had no idea and just said its for a 5v signal. He sold me one and it says 5w on it. Is that the right one? I haven't been able to find any that guys are using and to be honest. Dont know if the wattage size makes a difference here. lol
#4
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Well....lets figure it out quick....
Voltage = Current * Resistance
12 Volts = Current * 10,000 ohms
Current = 0.0012 amps
Lets see what kind of current your 5W resistor can handle:
Power (watts) = Voltage * Current
5W = 12V * Current
Max Current allowed for 5W resistor= 0.4166 Amps
You could have used a tiny 1/4 watt resistor, or even a 1/8 watt resistor.
Minimum wattage of resistor would be:
P=V*I
Power = 12 Volts *0.0012 Amps
Required Power = 0.0144 Watts
Don't confuse wattage with resistance. However, your doing no harm with a higher than required power rating, so you will be fine with what you have. But the lower wattage are the physically smaller resistors and easier to hide in the harness.
Voltage = Current * Resistance
12 Volts = Current * 10,000 ohms
Current = 0.0012 amps
Lets see what kind of current your 5W resistor can handle:
Power (watts) = Voltage * Current
5W = 12V * Current
Max Current allowed for 5W resistor= 0.4166 Amps
You could have used a tiny 1/4 watt resistor, or even a 1/8 watt resistor.
Minimum wattage of resistor would be:
P=V*I
Power = 12 Volts *0.0012 Amps
Required Power = 0.0144 Watts
Don't confuse wattage with resistance. However, your doing no harm with a higher than required power rating, so you will be fine with what you have. But the lower wattage are the physically smaller resistors and easier to hide in the harness.
#6
TECH Senior Member
iTrader: (7)
Well....lets figure it out quick....
Voltage = Current * Resistance
12 Volts = Current * 10,000 ohms
Current = 0.0012 amps
Lets see what kind of current your 5W resistor can handle:
Power (watts) = Voltage * Current
5W = 12V * Current
Max Current allowed for 5W resistor= 0.4166 Amps
You could have used a tiny 1/4 watt resistor, or even a 1/8 watt resistor.
Minimum wattage of resistor would be:
P=V*I
Power = 12 Volts *0.0012 Amps
Required Power = 0.0144 Watts
Don't confuse wattage with resistance. However, your doing no harm with a higher than required power rating, so you will be fine with what you have. But the lower wattage are the physically smaller resistors and easier to hide in the harness.
Voltage = Current * Resistance
12 Volts = Current * 10,000 ohms
Current = 0.0012 amps
Lets see what kind of current your 5W resistor can handle:
Power (watts) = Voltage * Current
5W = 12V * Current
Max Current allowed for 5W resistor= 0.4166 Amps
You could have used a tiny 1/4 watt resistor, or even a 1/8 watt resistor.
Minimum wattage of resistor would be:
P=V*I
Power = 12 Volts *0.0012 Amps
Required Power = 0.0144 Watts
Don't confuse wattage with resistance. However, your doing no harm with a higher than required power rating, so you will be fine with what you have. But the lower wattage are the physically smaller resistors and easier to hide in the harness.
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#8
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I've seen/talked to people and some have used resistors and some have not with success. The only thing I noticed that's different is the people that don't use the resistor use the large body continental sensor (the square body style with the mountig holes). The ones that needed a resistor are the people using narrower body sensor (rectangular shape and no mounting holes). Makes me think maybe the square body sensors already have a resistor inside it. Idk, maybe I'm wrong but that appears to be the case.
#9
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The one in the instructions is the wide sensor with the mounting holes. That says use the 10k ohm resistor. Thats the one I got.
Last edited by chub406; 03-29-2017 at 12:54 AM.
#10
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I got a pack of 4 from Radio Shack, used the GM sensor listed in the Holley
instructions-with 93 octane from a pump that says contains 10% eth, I read
8%-so I made that 0% fuel added, then dumped 5 gallons of E85 (tested from the pump and was E85) it rose to 24%.
I noticed a smoother idle, was kind of surprised by that.
instructions-with 93 octane from a pump that says contains 10% eth, I read
8%-so I made that 0% fuel added, then dumped 5 gallons of E85 (tested from the pump and was E85) it rose to 24%.
I noticed a smoother idle, was kind of surprised by that.