Hello,
Have an 04 Silverado 2500
LQ4
SS2
Deka 80's
3 Bar
GT45
My boost gauge has always read more than my MAP, (but Sunpro Ebay special doesn't exactly mean accurate). I had the EFI source MAP, switched to the Camaro MAP. Both of these ended up reading about the same under boost.
The turbo seems to either be pumping hot air, my IAT's rise insanely fast, despite the sizable intercooler, or it's actually pushing more boost than the MAP is telling me.
Either my MAP is reading incorrectly, and I actually am humping about 15-17lbs through, or this turbo is out of it's efficiency range at like 7-8lbs as per the falling boost curve.
I am also curious as to why my absolute manifold pressure is telling me over 30lb (minus 14.5), but my KPA is telling me 7-10. This is the standard 312.50/11.25 offset unit.
Anyone shed some insight? A few pulls attached as well as my current tune.
100 pull.hplbc up pull.hpl1-2.hplfans screwing around.hpt