 WTB OR TRADE: MSD pills or modules, Around 4400rpm... see pics |
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| jim_hoyland |
 Nov 15 2012, 04:32 PM
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Get that VIN ?  Group: Members Posts: 9,314 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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I'm looking for an MSD module ( or pill), or set of modules, that are pre-set for 4400 rpm + or -
I have a 5000 to sell or trade, its a little high for my needs. They look like this: (IMG:http://www.914world.com/bbs2/uploads_offsite/www.atomicperformance.com-643-1353024801.1.jpg) |
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Replies
| jim_hoyland |
Nov 18 2012, 09:21 AM
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Get that VIN ? Group: Members Posts: 9,314 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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The 3000 pill comes with the MSD RPM Activated Switch. Given the resistance/rpm chart above, can an rpm activated switch be made from Radio-Shack parts ? How might that be done ? Curious minds want to know... (IMG:style_emoticons/default/smile.gif)
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| ArtechnikA |
Nov 18 2012, 09:41 AM
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(jim_hoyland @ Nov 18 2012, 10:21 AM)  ...Given the resistance/rpm chart above, can an rpm activated switch be made from Radio-Shack parts ? How might that be done ? Those two thoughts aren't related... The resistance is what the MSD-6AL rev-limit circuit uses in its comparator circuit. Each comparator circuit design will be different. For instance, I believe the Crane HyFire is actually digital. I'd guess the MSD circuit is probably charging a capacitor of a known value through the resistance. Or possibly discharging at a known rate through the resistance, since no pill == no limit... But either way, you have something that's reset by each trigger, and a resistance-proportional charge/discharge rate, and an analog comparator (just a transistor?) that turns on the rev-limit circuit when the charge level is at the threshold. I bet a real EE could sketch up such a circuit on a napkin in 10 minutes. I'd have to re-learn a bunch of stuff to figure out appropriate values for the resistors and capacitors, as well as the relay drive part to do whatever it is you want done when the rev limit is achieved. You could also complexify it with microprocesor control and digital counters and such, but it's really not that complicated and the application tolerances don't require it. (E.g. - if you had a couple of rpm drift from cold to hot, it'd be fine...) I gave up on finding any useful parts at Radio Shack a long time ago. Now they just sell cell phones and such... Mouser and DigiKey get my business now... |
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Posts in this topic
jim_hoyland WTB OR TRADE: MSD pills or modules Nov 15 2012, 04:32 PM
jim_hoyland Would also consider a trade. I have a new and unus... Nov 17 2012, 12:49 PM
ArtechnikA There is no magic - the 'pills' are just r... Nov 17 2012, 04:25 PM Jeffs9146 I have a 3000 pill! Nov 17 2012, 04:36 PM campbellcj LOL, what are you guys driving, 8L diesels? (Actu... Nov 17 2012, 04:54 PM ConeDodger
LOL, what are you guys driving, 8L diesels? (Act... Nov 18 2012, 03:51 PM ConeDodger Jim, I have bunches of the resistor pills. The are... Nov 18 2012, 03:55 PM |
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