I stumbled on this...

MSD - RPM pills/Ohms
3000 - 1930
3200 - 2084
3200 - 2086
6000 - 4590
6100 - 4700
6300 - 4910
6400 - 5010
6400 - 5020
6500 - 5130
6700 - 5350
6800 - 5460
6900 - 5570
7000 - 5690
7400 - 6150
Now you can make your own.

What, you don't like spending $50 on a $.01 resistor?

You could have said... What, you don't like spending $50? 

Anyway, it didn't suggest the wattage of resistor required. Go big, it'll be cheap.

The MSD pills are resistors. Resistors in quanitity are about 10 to the penny. MSD charges ~$50 for a set of pills, which are pretty 1/4 watt resistors.

For the power requirement, that is easy enough -

E=IR

or in this case use a little algabra  -

E/R=I

so

12Volts/1930 OHMS = .0062 Amps

Amps * Volts = Watts

.0062 * 12 V = .074 Watts

So in theory, an 1/8th Watt resistor could work (.125W) - but you usually (at least) double for guardbanding.

Keep in mind the 1930 ohm resistor would draw the most current - the higher RPM pills would draw even less.

The MSD pills are resistors. Resistors in quanitity are about 10 to the penny. MSD charges ~$50 for a set of pills, which are pretty 1/4 watt resistors.

For the power requirement, that is easy enough -

E=IR

or in this case use a little algabra  -

E/R=I

so

12Volts/1930 OHMS = .0062 Amps

Amps * Volts = Watts

.0062 * 12 V = .074 Watts

So in theory, an 1/8th Watt resistor could work (.125W) - but you usually (at least) double for guardbanding.

Keep in mind the 1930 ohm resistor would draw the most current - the higher RPM pills would draw even less.

Got it

Thanks 2sav

I doubt that you'll find that exact value (1930) in a resistor.  You can go 1.8K or 2K and keep in mind there is a +/- 5% shift possible.

Good point. You can get a 1% resistor, but those that aren't EE's or Physicist don't realize - everything in electronics is an approximate. 1930 ohms is the calculated value, not nessasarly the exact one. Close enough is a way of life.

only if you want the rev limiter to come on at 3K...otherwise you need a larger value...

only if you want the rev limiter to come on at 3K...otherwise you need a larger value...

I was just using the 2K as an example.  Meaning I was rounding up from the 1930 ohm.  Hell you can buy these resistors from Jameco . Com for around a penny a piece.  Problem is you have to buy 100 at a time.  Group buy???  LOL

How many of us would it take to come up w/ a buck?

Hmmm,  From what I've read maybe 30 or 40 of us.  LMAO!!!