So I recently finished swapping a 128k mile LS1/T56 into my NA Miata. In the process, I upgraded the following:
-'99 LS1, stock untouched 853 heads
-228R .600/.600 112 LSA cam
-PAC Beehive springs
-7.425" Pushrods
-LS6 Intake
-New timing sprockets/LS2 Chain
-ASP 25% Underdrive
-MSD Wires
-TR55 Plugs
-Sanderson Shorty 1.50" Primary Headers
-True Dual 2.5" Exhaust/catless
Please see the attached logs/tune.
I am currently working on dialing in my VE tables, so running Open Loop, MAF-less. and a bunch of tables zero'd out. Commanded timing is matching spark tables, so no concern there. Again, keep in mind, I am still trying to dial in VE's.
My concern is, It seems like this isnt much timing at all to be running to get this degree of knock. Its not a very repeatable condition, I get it on some logs but not all. Of course, im trying to do a cross-comparison, but as many of you may know, that is difficult with so many variables.
My next course of action, is to go out and see if I can locate some 100+ octane to try.
Also note that I am running poly engine mounts, and stock transmission mount. It is, by no definition of the word, harsh in that department. Stock 243 head, which have never been off.