Looking to see if anyone has experience tuning an ITB setup like this:
https://speedmaster79.com/Chevy-GM-L...Complete-Satin
This would be going on a 2000 C5, LS3/L92 6.2L, SBE and stock heads (no porting) with a BTR LS3 Stage 2 cam (Specs: 225/238 .612"/.585" 113+3). T56 and 4.10s. Intended use is a weekend warrior with a bunch of casual road racing use in the warm months. I am not too concerned with overall power gains, more so interested in the increased driveability and mostly the sound!
I?m thinking about adapting an LS1 78mm or LS2 silver blade throttle body, remotely mounted, to act as a servo with custom linkage to actuate the 8x throttle bodies mechanically, so theoretically DBW vs DBC is not really a concern. Since the car is currently running the Gen 4 motor it's using a silver blade LS2 TB with an conversion harness, but no reason it can't use an LS1 TB either.
Concerns:
-Need to figure out motion ratio of DBW TB vs ITB linkage to make sure they?re 1:1. Although the TPS% and actual DBW blade position is not the same, I'd think that keeping the ITBs and the "servo" (TB) would make sense.
-Need to fab up a vacuum manifold to supply vacuum to MAP, brake booster, HVAC system, and maybe a port for IAT. I'd need to tap a fitting into each runner between the throttle blade and the head, then join them at a common log mounted to the valley...
-PCV ? can add a port on this vacuum manifold to plumb similar to an OEM setup ? or just run lines from the valve covers to a vented catch can.
-Filtration ? I only drive my car on nice weather days, so elements aren?t a concern but there is still the issue of general dust/debris/leaves/etc. Filters/screens look goofy and rob power
-Tuning - The biggest concern. Obviously MAF is going bye bye and I will have to convert to Speed Density, but have read that the ITB setup causes the MAP to read atmospheric (100kPa) over 20-30%, which basically renders it useless. Does HPTuners support Alpha N calculations (RPM vs TPS only)?
What other special considerations do I need to look at when using HPTuners to calibrate an ITB setup?