Havnt ruled that out completely, but I just figured it maxes because Im flowing alot of air.
So in light of being completely stumped and extremely frustrated with the knock issues I poured what little methanol I had left into my tank and set out for a run with alky on. Set the blue knob at 12:00 position (my razor's alky kit is old, 2004 and doesnt have numbers) and hit the test button to make sure alky flowed. Did two runs up a my "track", which is a hill but its nice and wide and the cops dont go around there too much. Stupid me did not log the first run, but from the way it felt Im sure it wasnt much different from the 2nd one I logged. So in the recorded run, I eased into boost to make sure alky was flowing, than slowly gave it more and more throttle until the end where I gave it more of a stab almost to full throttle.
Now in comparison to my other logs there's some definite similarities. Just like all the other ones, at around 10.4lbs of boost knock comes in and settles down by the time it hits 12lbs. Not audible or anything. Now, near the end of the run you will notice a 0.7 0.5 0.2 knock sequence. I heard one audible "tick" of knock when this occurred. This also happened on the previous run I did not log. One audible tick. This once again stumps me. Only 15 lbs of boost
with alky and I get knock? Than it goes away? The only thing that I find slightly odd is when this knock comes in, the AF ratio drops from 11:5 to a low of 10:6. When it comes back up to the 11:5 range the knock goes away.
Both runs were silky smooth with no power loss, stumble, or anything of that sort.
I had been holding off on the alky for a long time because I felt it was a bandaid or crutch. That the car should be able to make 15lbs of boost without it, and I wanted to make sure the car was truly at its limit before I put alky in the equation. I do now wonder if 13-14lbs of boost is all the car can run on straight 91 octane. I consider the knock in the 10lb boost range most likely false since it shows up in every run in the same place and I can never hear it. So if I take that out of the "alky run", its knock free until 15lbs. Logically that means to me that the alky is suppressing some real knock along the way.
Now I am left to wonder why the blip of knock at 15lbs with alky? And should I risk turning the boost up a bit with alky to see what it does? I think I should be able to get much more than 2-3 lbs of boost over 91 octane limit with alky.
Here is the run, has a short log of the car idling as well.