Remove your distributor, and never look back..
with Electromotive's new eXtreme Direct
The XDI is the latest ignition system from
Electromotive. This new, configurable ignition system uses a controller
with one or two Direct Fire Units (DFU) to power up to 14 different
engine configurations. The XDI uses Electromotive’s patented
direct fire ignition and it’s high-resolution crank position
sensing to produce the most accurate and most powerful ignition
available in the aftermarket.
The Direct Ignition Advantage High Resolution Single-Crankshaft-Sensor Decoding
A "Direct Fire" ignition fires the spark plugs directly from the coils
and not through a distributor cap and rotor. This is accomplished by
using multiple coils, each with two spark terminals. The coil terminals
are connected to the spark plugs, allowing one cylinder to fire on
compression while its companion cylinder fires simultaneously on
exhaust. Open spark gaps in the rotor and cap are eliminated, making
wear and moisture problems a thing of the past.
What sets XDI apart is the ability to charge multiple ignition coils at
the same time. This increased dwell time means that full spark energy
is available over the entire RPM range (up to 9600 at 12 volts). Unlike
Capacitive Discharge systems that only put out one very short spark,
the XDI puts out a full energy, long burning spark at your highest and
most critical engine speeds. Long burn times assure effective burning
of even lean fuel mixtures.
The brain of the XDI includes dual digital microprocessors using
patented spark algorithms (patent number RE 34,183), which takes the
electrical signal from the crankshaft sensor, identifies the two
missing teeth and then keeps track of the remaining 58 teeth. The XDI
determines engine speed and computes the spark advance from your knob
settings. Setting the timing advance curve is a simple task that anyone
In addition to synchronizing and firing the plugs at the correct
advance angle, the XDI also computes the exact dwell to produce 9 amps
of coil current. Coil charging is measured dynamically, so changes in
RPM, battery voltage, or temperature are all accounted for on every
spark. This corrects any errors that are caused by battery voltage or
coil temperature changes and insures maximum spark energy.
Some OEM direct ignition systems use both a crankshaft and a camshaft
sensor assembly, making the system more complicated and more expensive
than it needs to be. Other systems use low resolution, four to ten
tooth trigger wheels on either the crankshaft or camshaft; these are
not enough teeth to assure that the coils are firing without timing
errors. The XDI solves these problems with a single, high resolution,
60-minus-2 tooth crank trigger wheel. This affords resolution unheard
of in any other electronic ignition available today, offering spark
accuracy of ¼ degree of crankshaft rotation. This accuracy
makes the system ideal for the most demanding engines.