ignition idea
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Senior User
Joined: Jun 2006
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ignition idea
ok,some people tell me that if i go with a TFI coil for my DS2 ignition upgrade that i dont need that pesky resistor wire.is this true and if so does anyone know of a wiring diagram,thx ya'll
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Duraspark2? RFI capaciter?
My opinion on ignitions is just use an msd or like box with a matching coil. http://www.msdignition.com/pdf/6%20series/6series.pdf
This way, you have a MSD ignition (which is less failure prone than duraspark2), whatever coil you want and two connections to your distributor.
My opinion on ignitions is just use an msd or like box with a matching coil. http://www.msdignition.com/pdf/6%20series/6series.pdf
This way, you have a MSD ignition (which is less failure prone than duraspark2), whatever coil you want and two connections to your distributor.
Moderator
Joined: Jan 2001
Posts: 56,999
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From: Virginia
You can try what you want, but the duraspark II box and the duraspark II coil are made to work together with a resistor, and be reliable for years of service.
The problem is you never get something for nothing. If the TFI coil will give a hotter spark with the duraspark II box, that means it's drawing more current through the duraspark II box. Can it handle it? Possibly, I do not know. Will it shorten it's life? That is a possibility too.
The DSII system is also designed for a resistor. When you first apply power to the coil, the box sees it pretty much as a dead short for the first few milliseconds, till the magnetic field starts building up inside. Power is applied to the coil 4 times per revolution of the engine. The resistor limits this current surge and lets the coil and the box run cooler and last longer.
The GM HEI system does not use a resistor because it limits the current electronically inside the module. It's my understanding the Ford TFI system works the same way, and limits the current inside the TFI module.
The problem is you never get something for nothing. If the TFI coil will give a hotter spark with the duraspark II box, that means it's drawing more current through the duraspark II box. Can it handle it? Possibly, I do not know. Will it shorten it's life? That is a possibility too.
The DSII system is also designed for a resistor. When you first apply power to the coil, the box sees it pretty much as a dead short for the first few milliseconds, till the magnetic field starts building up inside. Power is applied to the coil 4 times per revolution of the engine. The resistor limits this current surge and lets the coil and the box run cooler and last longer.
The GM HEI system does not use a resistor because it limits the current electronically inside the module. It's my understanding the Ford TFI system works the same way, and limits the current inside the TFI module.
