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Old 08-11-2012, 05:00 PM   #1
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Default What resistor to use?

I just picked up some supra black top injectors part number 23250-42010, I'm running an MS1 v3 board. I read in another thread that brain said to use a 50watt 10 ohm resistor wired inbetween each injector ground, is that correct?
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Old 08-13-2012, 08:41 AM   #2
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any one??
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Old 08-13-2012, 09:19 AM   #3
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That is one way to do it.
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Old 08-13-2012, 09:31 AM   #4
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What are some other ways?
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Old 08-13-2012, 11:16 AM   #5
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Another way would be to go to jbperf.com and buy a PWM injector driver board and wire it inside the MS. This would allow you to drive PWM injectors directly.

FWIW: I ran 450cc dsm injectors in my miata with 10ohm 10watt resistors with no ill effects (the guy that bought it from me still drives the **** out of it without issues)
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Old 08-13-2012, 11:34 AM   #6
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Yeah I'm probably going to end up buying some resistors and wirig them inline with the injectors. Is there any stores that sell that high wattage of resistor? I know radio shack doesn't carry that high, but idk what other types of places would other than online
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Old 08-15-2012, 07:08 PM   #7
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14.1V/10Ohms = 1.41A.
1.41A x 14.1V = 20W.
So even if your injectors had 0 resistance of their own and you had a 100% duty-cycle, 50W would be waaaaay over-sized.
Chassis mount resistors can exceed their watt rating considerably when properly cooled. That would mean bolted to a heat-sink (like the MS housing for example).
So 10W should be sufficient. They can be had at Mouser or Digikey.

Mouser
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Old 08-16-2012, 09:00 AM   #8
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I have a peak and hold injector driver now, but used to run resistors via raiding an junkyard for a resistor box from an old (88-91) prelude that was there.
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Old 08-16-2012, 10:16 AM   #9
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i just went ahead and bought some 50watt 10Ohm resistors. so we will so how it works out when they get here and i get my build done hopefully next week it will be finished
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