DUI DIS­TRIB­U­TOR IN­STALL

PER­FOR­MANCE DIS­TRIB­U­TORS’ DUI IN­STALL

4 Wheel & Off Road - - CONTENTS - Harry Wag­ner BY EDI­TOR@4WOR.COM PHO­TOG­RA­PHY HARRY WAG­NER

We im­proved power, mileage, and re­li­a­bil­ity.

IT’S NOT UN­COM­MON TO FIND A small-block Chevy engine un­der the hood of an FJ40 Land Cruiser. They make more power than the fac­tory six-cylin­der and are lighter to boot. We had many com­pelling rea­sons for keep­ing the fac­tory F engine in our FJ40 though. Af­ter per­form­ing sev­eral en­gines swaps we learned that they are never cheap, even if you al­ready have the engine. Bell­hous­ings, ex­haust, wiring, ra­di­a­tors, mo­tor mounts, new drivelines … the costs add up in a hurry. And this cream­puff is too orig­i­nal for a V-8 swap or 1-ton axles. While it would be more ca­pa­ble on the trail with these mod­i­fi­ca­tions, the ve­hi­cle would likely go down in value!

In con­trast, bet­ter per­for­mance from the stock F engine would be ben­e­fi­cial for a num­ber of rea­sons. Just be­cause we are keep­ing the fac­tory engine doesn’t mean that we aren’t look­ing for more power, mileage, and re­li­a­bil­ity. To ac­com­plish all of those goals in un­der an hour, we re­cently added a Per­for­mance Dis­trib­u­tors Davis Uni­fied Ig­ni­tion (DUI) dis­trib­u­tor and Livewires plug wires to our Land Cruiser. Uni­fied mean that the high-volt­age coil is lo­cated in­side the dis­trib­u­tor cap, and only one wire is needed to com­plete the in­stal­la­tion. The coil pro­duces 50,000 volts with a low enough am­per­age draw that we don’t need to be con­cerned about tax­ing our an­ti­quated wiring sys­tem.

While it is sim­i­lar to a GM HEI dis­trib­u­tor, we ex­pe­ri­enced sev­eral ben­e­fits that are unique to Per­for­mance Dis­trib­u­tors. The com­pany tunes the ad­vance curve for each ap­pli­ca­tion us­ing a Sun dis­trib­u­tor ma­chine to en­sure a pre­cise tim­ing curve tai­lored for your ve­hi­cle. The dis­trib­u­tor is also vir­tu­ally water­proof, mak­ing it per­fect for off-road con­di­tions from wa­ter cross­ings to mud bogs.

And since Per­for­mance Dis­trib­u­tors builds each unit with a cus­tom ad­vance curve tai­lored to your ve­hi­cle’s spec­i­fi­ca­tions, it’s like get­ting an ig­ni­tion dyno tune thrown in. With just a lit­tle wrench­ing you’ll in­stantly no­tice an im­prove­ment in driv­abil­ity and power, eas­ier start­ing, im­proved throt­tle re­sponse, and a 1- to 3-mpg im­prove­ment over the old ig­ni­tion parts.

We com­ple­mented the dis­trib­u­tor with a fresh set of NGK V-power spark plugs and Per­for­mance Dis­trib­u­tors’ Livewires. The Livewires use 8mm wire cov­ered by a heat-treated fiber­glass sleeve that is rated up to 1,400 de­grees F, which is a tem­per­a­ture we hope our old Cruiser never meets. Adding Per­for­mance Dis­trib­u­tors’ DUI dis­trib­u­tor and Livewires re­sulted in quicker start­ing, a smoother idle, im­proved throt­tle re­sponse, and even a bump in mileage. All in less time than it would take you to find head­ers that fit your engine swap. 1

This is an in­stance where size does in­deed mat­ter. Engine bays with dual bat­ter­ies or air com­pres­sors might have space is­sues; how­ever, we had no prob­lem fit­ting the Per­for­mance Dis­trib­u­tors DUI dis­trib­u­tor un­der the hood of our Land Cruiser.

2

Our old dis­trib­u­tor and coil were ad­e­quate, but there was def­i­nitely room for im­prove­ment. The good news is that it’s stabbed in an engine that was re­built shortly be­fore we pur­chased the Land Cruiser (we got re­ceipts). An­other rea­son to keep the six-cylin­der.

3

We started by not­ing the fir­ing or­der and set­ting the tim­ing to top dead cen­ter be­fore re­mov­ing the old dis­trib­u­tor. This was con­firmed by the ro­tor po­si­tion and the tim­ing mark on the fly­wheel.

4

The DUI dis­trib­u­tor is sim­i­lar to the HEI Gen­eral Mo­tors dis­trib­u­tor with a 50,000-volt in­te­grated coil and low-am­per­age draw built right into the dis­trib­u­tor so min­i­mal wiring is re­quired. We re­tained the wire from the orig­i­nal coil and added the in­cluded spade con­nec­tor from Per­for­mance Dis­trib­u­tors to power the dis­trib­u­tor. A tach pickup is also in­cluded for those run­ning tachome­ters.

5

Both the orig­i­nal dis­trib­u­tor and the new DUI dis­trib­u­tor use vacuum ad­vance, which comes from the in­take man­i­fold. Per­for­mance Dis­trib­u­tors pro­vides a cus­tom ad­vance curve that dra­mat­i­cally in­creased driv­abil­ity, and the DUI dis­trib­u­tor is cov­ered by a one-year war­ranty from date of pur­chase.

6

We added fresh NGK spark plugs at the same time as the dis­trib­u­tor and Livewires. Per­for­mance Dis­trib­u­tors states that the ig­ni­tion is pow­er­ful enough to open the gap up to

0.055 inch, so we did ex­actly that.

“We added more power, mileage, and re­li­a­bil­ity”

7

It’s clear that our old dis­trib­u­tor was not pro­vid­ing the cylin­ders enough spark to com­pletely com­bust the fuel. In­creased volt­age and more pre­cise spark de­liv­ery from Per­for­mance Dis­trib­u­tors should re­solve that is­sue.

8

The 8mm wires come in the proper length for our engine and are even numbered for fool­proof in­stal­la­tion. They are avail­able in black, blue, pur­ple, red, sil­ver, or yel­low.

9

The com­plete in­stal­la­tion took us un­der an hour, although we did spend ex­tra time clean­ing up the Livewires rout­ing af­ter this photo was taken. We added Per­for­mance Dis­trib­u­tors wire looms to ac­com­plish this task.

10

The fi­nal step was to time our F engine af­ter in­stalling the new dis­trib­u­tor. The tim­ing mark on this engine is not on the crank pul­ley but rather the fly­wheel. We di­aled in 7 de­grees of ini­tial tim­ing, and the engine purred and ran smoother than it ever has in the past.

SOURCE

PER­FOR­MANCE DIS­TRIB­U­TORS 901.396.5782 per­for­mancedis­trib­u­tors.com

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