No, in low load there may be not enough cylinder pressure to get knocking even though your timing is far from best fuel efficiency and increasing pressure pulls against piston making the work unefficient.

Yeah for light load knock is hard to get unless you go way way too far. Likely sympoms are a bucking or surging feeling. Basically wherever you get the highest vacuum is likely the best mileage and power delivery for light cruise. Go too far and like xhomm02 said, you are making the engine work against itself.

^ When I cruise and check the evoscan timing* readout display, there is no surging or hesitation as it cycles around 40*-44*, so I guess that's a good sign.

I am not sure about your Costco but up here that is where the cheap people go and no one cheap uses premium so it just sits in the tanks and goes bad. Try using a different brand of fuel if you are experiencing knock where the majority aren't.

I don't speak for all of us but I am tuning with an ethanol blended fuel which is going to require more timing to have the flame front at the same spot as an unblended fuel.

Knock means you have definately gone to far. However it is quite possible to advance your timing beyond MBT. MBT in a simple definition is defined as the minimum amount of timng required to make the maximum torque. What this means is that these engines will pass maximum torque before they knock. many engines with ineffeicient combusitoin chambers will knock before they reach maximum torque. This can be done on the roaad however a dyno really makes this alot easier. Real time tuning makes this even easier I have looked at the code I think there is enough room to add pointers. It will depend if there is enough ram avail. Enough chatter and on to the project.

Cheers C

Actually, reasons why I use Costco:

1.) Cheaper by at least 35 cents/gallon from Shell, etc.
2.) I think they always have the most "fresh" gas since cars usually lineup (long ones), including luxury brands that use premium gas only.
3.) We go there once every two weeks for groceries, so it's convenient

I never got any knock with this thread's mod too... :-)

Just speaking from experiance I had here with customers car's that all of a sudden started knocking out of nowhere. My biggest enemy is fuel quality and it shouldn't be because most of the NorthAmerican fuel comes right out of the ground up here. I guess your Costco is different than ours. lucky you I would love to use my grocery purchases against my gas bill LOL

Oh wise ones... take this screen shot and guide me to which tab I need to go to and adjust?

And here is another shot with all of the tables collapsed except for the ignition ones.

Ign low det

Not the WOT one though right? I'm assuming not but just checking. Now what I need to do is adjust the timing just in the RPM ranges I will be cruising in or ...?

Here's a pic of that table... can someone give me a little insight here?

The axis is just flipped compared to evoscan (Hiboost's image). Don't adjust the high det map, only the low det map. Where you see 40 for timing, you can up to 43 or 44 with some smoothing, but only make changes in the 2500-4500 rpm range or so. Follow HiBoost's example but just make sure you have some smoothing so you don't jump more than 6 degrees between adjacent cells.

Here is my copy of HiBoost's map... there are some RPM's that I don't have that he does and I don't know what to put for these... would someone mind telling me what needs to be changed and what looks ok? From 120 and up I left it unchanged since HiBoost had nothing written for his.