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12-05-2008, 10:35 PM
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Ride: VP V6 Exec
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Posts: 368
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Questing about ohm differences
Ok if i had fuel injectors that wer 14.5 ohm and installed them in my car which is normally 12-12.5 ohm. What would be the outcome?
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12-05-2008, 10:37 PM
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Ride: 5 litre VG ute, VP V6 5 speed
Join Date: Jul 2005
Location: berri, south australia
Posts: 3,205
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lower injector operating voltage.... ohms is resistance, resistance affects current, less current = less voltage
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12-05-2008, 10:39 PM
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Ride: VP V6 Exec
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Ok in lame terms? What wont spray correct or what? And is there a easy way to up the ohm's?
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12-05-2008, 10:39 PM
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Ride: 5 litre VG ute, VP V6 5 speed
Join Date: Jul 2005
Location: berri, south australia
Posts: 3,205
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less voltage means slower pintle opening and closing basically
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12-05-2008, 10:41 PM
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Ride: VP V6 Exec
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Is there a easy/cheap way to up the ohm produced?
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12-05-2008, 10:43 PM
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Ride: 5 litre VG ute, VP V6 5 speed
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not really... why do you want to run more resistance?
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12-05-2008, 10:45 PM
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Ride: VP V6 Exec
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Well i need larger injectors and i have 2 options i can import a set for 270 aussie (12 ohm) , or buy a set of 42lb'ers off a bloke in oz but these are 14.5 ohm.
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12-05-2008, 10:50 PM
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Ride: 5 litre VG ute, VP V6 5 speed
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i thought that was how the size difference was measured? in the resistance of the windings inside the coils aswell as the size of the opening...
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12-05-2008, 10:53 PM
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Ride: VP V6 Exec
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What you think that the ohm increase with larger injectors? (i have no idea how it works hence silly question)
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12-05-2008, 11:04 PM
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I think ill just bite the bullet and import the same as stocky has then steal one of his tunes ehehe if he lets me, biggest concern was postage times.
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13-05-2008, 10:11 AM
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Ride: vx
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Quote:
Originally Posted by Peanuts Inc.
lower injector operating voltage.... ohms is resistance, resistance affects current, less current = less voltage
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Not quite. Less current = less power, the voltage at the injectors will stay the same(actually rise marginally due to less voltage drop along the wiring due to less current)
Whether the 14ohm injectors actually perform properly in the car, depends on their design. They may perform exactly the same as the lower resistance ones. |
14-05-2008, 07:09 AM
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Ride: VRII Acclaim
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commsirac is right, voltage stays the same. I think the gregorys specifiys the resistance as 12-15 ohms? I can double check but Id say it is ok. If it is working dont worry about it.
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15-05-2008, 10:26 PM
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Ride: VS S-Pack SII
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ohms law states: V = I x R
therefore: I = V / R (note, current flowing thruough the injectors is what activates them.)
For standard 12.5 Ohms
I = V / R
= 12 / 12.5
= 0.96 Amps <--- required to fire injector
For 14.5 Ohms
I = V / R
= 12 / 14.5
= 0.83 Amps
you do the math? (is it within limits?)
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