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Dec 24, 2010 | 11:37 AM

Techsalvager

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joes spark output mod

Can I use 100 ohm instead of 270ohm without problem for spark out on ms2 build?

Dec 24, 2010 | 12:19 PM

WestfieldMX5

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Yes, but use a 1/2W resistor because you're pulling 50mA (=1/4W) through it.

Dec 24, 2010 | 12:25 PM

Reverant

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I wouldn't quite say that 50mW are 1/4W. More like 1/16W, a bit less even. So he's fine with 1/4W.

Dec 24, 2010 | 12:30 PM

WestfieldMX5

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50mA @ ~5V

Dec 24, 2010 | 12:40 PM

Reverant

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Dec 24, 2010 | 12:42 PM

Techsalvager

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I used 1\2 watts anyways, cause its what I have on hand.

Dec 24, 2010 | 01:20 PM

Joe Perez

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Quote:

Originally Posted by Techsalvager

Can I use 100 ohm instead of 270ohm without problem for spark out on ms2 build?

Yes.

5v through 100 ohms is 50ma, which is 0.25 watts. So a 1/4 watt resistor will do. It'll generate some heat, but it'll be fine. A 1/2 watt part won't even notice.

Dec 24, 2010 | 05:35 PM

Ben

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We use 100 ohm pullups in the PNPs. Some of the newer hotter coils prefer lots of pullup. Pretty sure they're all 1/4 watt.

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Quote:

Originally Posted by concealer404

Buy an MSPNP Pro, you'll feel better.

Dec 24, 2010 | 05:55 PM

richyvrlimited

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what's the advantage of more pullup?

Dec 24, 2010 | 06:18 PM

#10

Ben

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If your coils fire, then likely none.

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Quote:

Originally Posted by concealer404

Buy an MSPNP Pro, you'll feel better.

Dec 24, 2010 | 06:20 PM

#11

richyvrlimited

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They don't when it's really cold out...

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