I need help with a tune on 2006 Z71 with 4.10's
specs are:
5.3 mild cam, LT's and high flow cats, ported TB, 8.1 truck injectors, CAI
Comp cam specs out at 202/212 .507/.500 with 1.7" rockers and 116 LSA, 1.8"rockers installed.
adjusted scalar, VE and MAF tuned then adjusted PE and spark and began WOT tuning with LM2.
I have tuned a few 5.3's some stock manifold and some shorty headers with stock cats that feel much stronger down low than this truck does.
1. Is something missing in the tune or is it something else (not enough backpressure?) ?
At WOT, it is a dog until >3000 rpm then it pulls strong. I went to 31 advance with 12.9 AFR with no KR. It made a little better power at 27 degrees total and woke up low rpm PE with lower timing but it kinda flatlines in third. I tried adding and pulling timing and +/- PE AFR but it doesnt respond much better.
I am stuck and don't know where to go from here, please point me in the right direction.