The Toyota 20R and 22R 4 cylinders are some of the most popular engines ever
produced. The new D.U.I. (Davis Unified Ignition) is the ultimate ignition for this
application. Produced from 74-89, trucks with this engine need to be upgraded
with today's technology, specifically the D.U.I. The D.U.I. is a one-wire, one piece
distributor. No more messy wiring or points to worry you. The Toyota D.U.I. is
available in either the Street/Strip version (up to 7000 rpms) or the Racing version
(up to 9000 rpms). Due to the longer duration spark which the D.U.I. produces, you
will be able to open up the plug gaps to a whopping .055". This burns the fuel more
completely, leading to more power. Our Dyna Module is designed with more dwell
time producing a hotter spark. No ballast resistor is used. Stock toyota systems
and many aftermarket systems require a ballast resistor which reduces the voltage
in the ignition system. Our D.U.I. allows FULL voltage into the ignition system,
giving you a better spark and more power. Because each D.U.I. is calibrated on a
distributor machine with a very accurate advance curve, you should be able to
increase your initial base timing from the factory setting of 0 degrees to 8 degrees.
That will set you back in your seat fast! The D.U.I. is a real work of craftsmanship.
Although it is uniquely designed, replacement parts are easy to find. GM HEI
replacement parts will fit right on the DUI and these parts can be found at your
local auto parts store. The unit is polished and lubed as it is assembled. Built
for durability, the D.U.I. has an upper and lower bushing, unlike stock Toyota
distributors with only one bushing. A tach hookup is included with the D.U.I.
according to everything ive ever laid my hands on base timing is not 0* its 8*
again, you have the stock carb you need to plug the vacuum line in the correct port
sounds like there's a problem with the low speed side of the carb maybe but i cant help on that
