Alright, now that I am going to COS3 and getting things in order, I thought I would start a new thread to ask about how to tune timing for an initial tune.

So, thinking about it, it would seem like there are only certain cells that would need to change in the spark tables. For example, in the base spark in park, how would I ever even have a cell like .08g/cyl and 4800 RPM get hit? Once I increase RPMs, air intake will drastically increase. Am I thinking about this correctly, or should I be changing ALL cells?

Just for reference, I am attaching my mods and tune.

  • 2001 LQ4 bored and stroked to 408.
  • 317 Stock Heads with Comp Lifters and Comp Springs
  • Wiseco dished 4.030" 9.5:1 CR pistons
  • Comp 230/238 .600 .603 @ 114 (Spec'd by Comp to maintain towing ability)
  • Melling High Volume, High Flow Pump
  • Cloyes single timing set
  • All new sensors in the block.
  • Whipple 2300AX (want to get to about 10-15psi)
  • Fully built 4L80E
  • Circle D 278mm 4L80E Torque Converter 2800 stall
  • Tru-Cool 40K Transmission cooler
  • 1000cc at 43psi FIC Injectors, so with manifold referenced they are about 114lb/hr @ 58psi
  • Pacesetter 1-7/8" LTs Tri-Armor with true dual 3" custom system
  • Volant CAI with Scoop
  • Intercooler Kit - CX Racing 31x12x4
  • EFI Live V1 going to COS3 and SD tune.
  • 34" Radiator w/ '05 Efans



Attachment 17163