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Flashing the New ECU and Initial Test Drive

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What Happens If You Turbo a 5.3L Yukon With No Other Mods? Lets Find Out! (Uncle Rob Hits the Dyno)

What happens here

Back at the shop, the team attempts to flash the newly acquired 0411 PCM using tuning software (likely HP Tuners). However, they encounter errors, with the software failing to detect the PCM. After some troubleshooting, they discover the issue is a loose battery terminal. With the terminal secured, the PCM is successfully detected and flashed with the turbo-specific tune, enabling proper fuel and engine management.

Goal: Successfully flash the replacement ECU and ensure engine functionality.

Tools and materials

  • Laptop Dell — Running tuning software (e.g., HP Tuners) to flash the ECU
  • Replacement 0411 ECU General Motors — The ECU to be programmed and installed
  • Tuning Software HP Tuners — Programming the ECU with a turbo-specific tune
  • Wrench — Tightening battery terminals

What they say

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we're doing some questionable things today yeah sure it'll be fine we'll figure out what the stock fuel limits are like we're ordering this stock like no no nothing done stock fuel rails stock engines like literally we have not touched the fuel system because um we want to put that money towards diamond jesus that's that's what we're doing no no that's not what we're doing but we are going to see what the untouched stock fuel system will do with a turbo on it first i just got to tack up this downpipe and then load this up this is probably going to be the most regular thing that's ever been on this dyno no i had a cobalt one time oh so we got we got a cobalt beat i'm i'm cool with that no this would be a fun one to test the two wheel versus four wheel drive with because it's so low power yeah that is your 50 50 we're fine i'm pretty sure the mechanical transfer cases are 50 50. yeah but yeah i wouldn't want to test that with the escalade but you know when that thing's going to make 400 on a good day yeah i think it'd be i've brought some f-150s up there and it was fine raptors yeah yeah we'll have to give that a shot then if the 4l60 survives let's go get this thing ready are you ready to dyno no already he doesn't want are you ready no he's not ready he's fired he's ready okay shop dog ready for the dino he doesn't like the mariachi you don't like the mariachi music good me neither anyway i just gotta weld the downpipe to the flange to anchor it down um i'm not gonna fully weld it because i'm not exactly sure that's where i want to keep it i'm just gonna tack it in a few places so that it won't come off yeah it's probably going to leak a little bit but you know what the exhaust dumps pretty much right down there anyway so it's inherently going to get fume leakage under the hood regardless

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