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Originally Posted by Drweldin
Thanks...everything you said makes sense, but I'm a little confused as to how you can have 10.xx AFR's, and still have knock...is it simply too much advance / boost....? Assuming you have decent gas (92 or higher)...or will colder plugs help? Background: I have 13G's, 450, DSM smic, good tune, etc, 17 psi....car runs good (stock platinum plugs), but I always have knock here and there (1-8 counts)...Ive already retarded base timing to 4 degrees, and that was am improvement...in my scenerio, can I ever cure it? Do I need to cure it? Should I retard back to 3 degrees?
Also, what's your guys take on the NGK Iridiums? I may pickup the BKR7EIX-11's (one range colder)....sorry, I didn't intend to make this a "how to tune my car" thread, but hopefully it'll help someone else too....
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I'm using the Denso iridium plugs and like them. IMHO, iridiums are definitely better than Platinum plugs.
As far as getting knock, do you have a thread somewhere that details what your problems are eg. datalogs that show where the knock occurs while logging rpms, O2, knock, TPS etc.? Knock could be due to lots of things but one of the first things to try to rule out is phantom knock caused by things like worn motor mounts or a nut/bolt that was accidentally dropped in the vicinity of the knock sensor/lower intake plenum.
Can 13g's hold 17psi to redline? I didn't think they did well at higher than 15psi in the higher rpms.
Max