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Old April 23rd, 2005, 10:12 AM
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Chris Davis
94 D90, 88 RRC
Join Date: Nov 2003
Location: Colorado
Posts: 2,106
Hyfire ignition box

I have sucessfully installed the Mallory Unilite distributor and the truck is running beautifully. I am considering upgrading my coil and adding a Hyfire control box as well. I have read of people having issues with the control box and the tach signal and have to use the tach adaptor and sometimes other elements to make the fuel system inject properly--others have no issues. Has anyone here used the Hyfire? I would like to become comfortable with its sucess rate before I order it and start fooling with a good running truck.


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Old April 23rd, 2005, 10:29 AM
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Hans Haase
The D-90.com Lab Rat
Join Date: Oct 2003
Location: Long Island, NY
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Congrats on the Mallory. Which one did you end up getting? Also, have you been keeping track of your milage in the past? I'd be interested to see what kind of gains you will be getting.

Upgrading the coil over the stock unit should provide a hotter spark, just remember to use Mallory's suggestion for the plug gap, since you'll be able to run it more open. I know they recently released a newer coil that has the ballast resistor built-into the coil. Good if using just the unilite, but you can't use that version with the Hyfire.

For the Hyfire, from what I've been getting, it's simply a digitally controlled box that does the same thing as the MSD ignition box at a cheaper price. The Megasquirt forums really bash the MSD as being overpriced and a nearly empty circuit board. Because of the multiple spark nature, you definitely can't just run a wire to the coil terminal like it's set up now. Otherwise, you'll be giving the ECU a confusing mess of multiple sparks per cylinder. You would need a clean tach signal for the fuel computer to use.

At higher RPM it ends up being a single long spark per firing, which is probably why people running high RPM have less troubles. But I would definitely plan on having to run the tach adapter.

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