Hi!
I am writing this post on behalf of my dad.
He has a old GMC Pickup that was restomodded back in 2016 using a 6.2 LS3 from a manual 2012 Camaro SS, and a wire harness + ECM / TCM / O2 sensors from PSI Conversion in NJ.
The installation was very smooth and the car ran right away, but recently we started running some 1/8th mile to get me used to dragracing in preparation for another car we are building.
While running we noticed that the ET and speed was very low compared to what we expected for 430HP / 1500kg , and my dad has his friend check the car with HP Tuners.
The car was showing almost zero degrees ignition advance on WOT, and his friend noted that there was probably 150 or so less HP than stock.
He also noted that in HP Tuners there is no AFR reading shown.
He tried changing up some things in the tune, and we were able to get it to run much better, but with some hesitation due to knock retard at WOT high load.
Am i right to assume that the AFR should be shown inside HP Tuners if it is actually being read, and that the ECM would run in Open Loop in the absence of AFR readings, which could perhaps explain why it's so sluggish?
We have tried everything i can think of including checking that the o2 sensors are providing voltage ( which they do, it fluctuates a lot though, anything between 0.1 and 0.9 volts on WOT) and verified all spark plugs/ingition cables/coils etc.
So basically, the cars starts and runs nicely and smoothly, but it feels like there is almost no power at all on WOT.
Does anyone have some tips and tricks on what we can do?
I should probably note that i have zero experience with Hp Tuners, but we do have my dads friend who knows the ropes.
Attached is a log from some test runs.
Thank you in advance.
pickis.1 (1).hplpickis.2 (1).hpl