i think your timing is low for that boost and meth. i'm running 18-22 IIRC with my 5.3 and tc78 with meth and 10-13psi. on a cold night with full timing oh man it pulls like crazy.

what are you tuning with? what is your base timing and what is it actually running? mine is set to 20 increaseing to 22 but half the time runs 18 or so due to iat vs timing.

 

I use hp tuners.. I need to check to see what timing was set at,
I am sure it was 15 deg, kept it lower because the truck will boost to 15-16 psi on the street

 

if i remember correctly. i ment was it 15 degrees timing. if you want email me your tune. let me know and i'll pm you my email.

 

Pm sent

 

I could take the tc78 off your hands lol

 

bump. Does anybody have any true input of when t-6 is needed versus t-4.

 

when u want to make more power...lol