HARRISON'S 5.3L LS CONVERSION PT. 2

Now that the motor was installed for the last time we were able to address the wiring and plumbing.  For the engine wiring and ecu we decided to go with Holley's new EFI system.  The system comes with the engine harness and a new stand alone ecu.  As with any aftermarket harness it comes with all new factory colored wiring and plugs.  The harness is completely independent so it has an integrated fuse box for the ecu and fuel pump powers.  Where the Holley EFI stands apart from the the rest is it's ability to self learn.  Once all of the basic perameters are entered and the car is running, you can put it in learn mode and let the ecu tune itself.    Our 5.3L had a cam, valvetrain, LS6 intake, throttle body, and the MAF was eliminated.  I was new to the software and it took me about 30 minutes to plug in all of the information.  Once I had it loaded the car fired up on the first try.   

The ECU itself is quite compact and was right at home mounted in the glove box. 

We use Interstate batteries in all our builds.  This battery is an AGM and weighed 14lb.s  With 2 guage wires for the charging system, this little battery has plenty of power to crank over a V8.  We did built a tie down with an mount for the circuit breaker.

As for plumbing we wanted to keep everything as clean as possible.  There is nothing more obvious about a conversion like than when people have worm clamps and hoses spliced together everywhere.  Gates has recently come out with new hose unions and thermal clamps that look nearly oem.

Nissans have a return fuel system that does need to be converted to a dead head style or non return.  This time we used the factory corvette fuel filter to handle the fuel return.  Not only is it a fuel filter but it is also a fuel pressure regulator.  It gives us our needed 56psi of fuel pressure and will return the un used fuel to the tank.  With some adapters, we ran a -6AN feed like the the factory LS6 fuel rails. 

The last bit of plumbing to handle was the exhaust system.  We built a system that has dual 3" into a single exit 3.5"  We used all Vibrant stainless components.