Quote:
last summer when I only had my modded exhaust and stock intake system.
I was tuned to 75. but few month ago I decided to do a test and my timing was the same with 70-71
so I lowered it
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From what I believe ~75 would cause mine to ping at high RPMs. I have a feeling your ECU may have been retarding the timing back to 70-71 levels which is why your timing is just the same between those settings. You are probably running safer now than you were last summer if that is the case.
One thing I want to note, is that if ~75 was working on the Dyno, it might not be working on the street. If that is the case, the argument for getting it tuned on the street is very important.
Also, I notice you have mid to high 70s in your timing map at low to mid throttle. Thats definately and area I should look at some more. I wonder if your fuel economy went up from setting those numbers that aggressivly. For me, I have not gone there yet as I've noticed that anything over ~1/3 throttle runs through the right-most 5-6 bars. Anything left of that is all for cruising and economy.