hitting rev limiter before shifting into gear at wot

[Taviewavie517]

6.0 lq4 stock engine stock transmission 4l80e when driving it surges between gears until you give it more throttle and when going wot i hit the limiter before it shifts into gear and when it does it feels like a slingshot. any help would be nice.Zerba revisited 06052025.hptwagon new tune data log.hpl

[bk2life]

6.0 lq4 stock engine stock transmission

google blue cat trans tuning tool

do that, upload to your tune and see if your issues are fixed.
let us know how it turns out

[RDF1]

Does this have a chinese swap wiring harness?
Your speed is way off and doesnt make any sense unless you have a wiring issue or the TSS/VSS swapped

at one point it shows 119mph at 5280rpms in 1st gear.
Then it shifts into 2nd and speed falls to 77mph and follows RPM trace just like the VSS connector is in the TSS Sensor and the TSS connector is in the VSS.

Notice Speed jumping around sporadically and its commanding gear changes at the same time.

[Alvin]

when you swap the ISS and VSS on these ... VSS will go up and down with engine speed. I have to diag that all the time with our swap harnesses.

Regardless.. that saw tooth pattern at low speeds happens if the VSS wires aren't twisted to resist noise. Google search twisted pair.

[Taviewavie517]

what would be the best thing for me to do and from what i can tell its the factory harness for the engine i didnt do the swap