hey guys was wondering if anyone could help me with this issue i've been fighting on my forged 5.7. Its a 6.1 crank, drop in piston/rod 10.3:1 comp ratio .010 overbore with a magnuson 2300. The issue i've been dealing with is seeing knock retard at relatively low timing and only 12psi. I run a 10gph nozzle spraying pure M1 methanol and usually run 93, however i just tried E70 and even that didn't help at all. Here's what has me lost, at the same boost pressure on the stock block (11-12psi) i was running 17* timing with just M1 and 93 and the car saw absolutely 0 knock. Now with the built motor I can't get the thing to take anymore than 13* up top(5500+) even with M1 & E70. In the midrange it doesnt like more than 8-10*,cells that i previously ran an extra 5* in with SBE. I figured maybe its a spark plug issue so i replaced them with NGK heat range 7 iridiums gapped @0.029", no difference. If anyone has any advice or ideas please lmk, my goal is to run 16psi on this setup but im afraid to turn the boost up if im seeing all this knock at only 12psi. I'll attach two tune files and two corresponding logs, both on E70+Meth with the only differences being +/- 2.5* timing.
Btw, I am not looking to just run a bunch ton of timing on the car, I haven't dyno'd it yet so I dont know where MBT is. My only reason for concern is its much more sensitive to timing on essentially the same setup just forged which is confusing, and I want to get it sorted out so I can run more boost knowing im not gonna melt a piston.
Tune files:
rev2_3.2pulley_E70_lowtiming.hpt rev2_3.2pulley_E70_hightiming.hpt
Logs:
rev2_E70_lowtiming.hpl rev2_E70_hightiming.hpl