M122 blown 5.3 in my 99 silveraydo

[Vbb199]

That’s pretty impressive. I feel like a complete Luddite with my 388 build.

Honest question- what’s the chance of diagnosing a problem on the side of the road with all of the harness work, repinning, etc? Just curious. It’s all so custom that I was wondering about that.

One thing is for sure though (and some of this is just anxiety of a new build and hoping that the machine shop had their sh!t together and I also didn’t make any mistakes) that the next thing would be an LS/4L80 swap if I window the side of the block. With the modern architecture, it’s too easy to consider.

Honestly, i used to not be a fan of all this wiring and sensors, but its pretty cool I guess.

Coming from a background that started with carb and TBI and has progressed, its neat.
Again I dont know if i'd be putting an LS in my squarebody, and if it got anymore advanced than gen 3/4, or non chevrolet I would be out of my element.

This is my first LS powered truck build. Ive tuned plenty, rode in plenty, drove many, but never owned one.


To answer the question about custom stuff and compatibility and being on the side of the road... I do get that concern and honestly, im not too worried about electrical gremlins since I went wire-by-wire on the whole harness with a multimeter. So that main engine harness presumably has great integrity, and its been re-wrapped, new grounds have been ran... ive got ridiculous redundant grounding going on. My prayers are that I have no issues.... because I was so meticulous and soldered every joint and heat shrinked almost every connection

Theres always the concern basic stuff might fail though.... perhaps I will get a little truck toolbox with a spare fuel pump, spare intercooler pump, spare coils and plug wires... aside from that, theres not much hope lol

 

[Hunter79764]

Ever heard of a bistable, single coil latching relay?

I hadnt. Until I googled, tbh.


HOW I HAVE THIS SETUP goes like this >>>>

When i press "tow haul" , it still sends a momentary (-) to the transmission and my p59, which will stilll switch strategies.

But it also sends a momentary (-) to the bistable relay, which will "latch" a solid (-) or (+) of your choosing.

You activate the momentary ground again, it unlatches
The holley terminator sees that "latched" circuit, and what it will do with it is change how the supercharger's boost bypass valve behaves thru -pwm. A totally seperate PWM map i program.

So when a button press i can have race truck, or back to halfway reasonable with another button press.

I love what you're doing with this. Does the latching relay retain it's position when power is removed? i.e., if you have activated Tow/Haul and then turn the truck off, the factory system "forgets" that you were in Tow and defaults back to the regular shift map. Have you made sure your latching relay will do the same?

I've got some similar but very different hackery planned for high idle/cruise control on mine, very different uses and goals, but similar thread of looking at stuff that the factory has done, then advancing it to be even more...

 

[Vbb199]

I love what you're doing with this. Does the latching relay retain it's position when power is removed? i.e., if you have activated Tow/Haul and then turn the truck off, the factory system "forgets" that you were in Tow and defaults back to the regular shift map. Have you made sure your latching relay will do the same?

I've got some similar but very different hackery planned for high idle/cruise control on mine, very different uses and goals, but similar thread of looking at stuff that the factory has done, then advancing it to be even more...

Honestly my buddy brought up the same concern to me and my hope is that putting the little latching relay on switched 12v+ (pink) will kill it

I guess if its still polarized I may have to look into other options.

I plan once all the electrical is done to hook up a battery, key on, engine off, and go along and test each peripheral in the chain, which includes all 4 outputs and the 3 inputs, and all the sensors needed for functionality

Laptop will be open so I can see feedback on the holley and P59 I hope.