I am attaching 4 hp tuner files. I have a customer complaining of surging amongst other things. He presented me with these files to help diagnose.
I have a good understanding of cars but reading these files, I'm struggling to come to a conclusion.
2018 High Country with 36k miles on it. Whipple charger was added at 10k along with long tube headers, stage 2 kit, and underdrive pulley according to customer.
Was tuned and drove great for 20k miles. Problem seemed to happen overnight.
Transmission has since been rebuilt, with high performance torque converter and then back to factory torque convertor. Customer stated it made no difference with this issue.
He has replaced the throttle body.
I'm seeing lots of fluctuation in fuel pressure and STFT. Maybe someone with more experience can notice the issue easily.
Thanks in advance.
test drive 1 - 7-8-23 245 pm.hpl
test 2.hpl
test 3 305 pm.hpl
test 4 310 pm.hpl