Is the 13 degree advance @ peak torque/boost in the low or high octane map? If it is in the high octane map, then isn't that a lot of advance? My 05 stock would run 1-3 degrees advance depending on conditions. Was the peak torque/boost rpm range leaned out AND timing added?

 

The following is just the way I understand it... I may be incorrect.

Keep in mind that the ECU doesn't simply switch from the High map to the Low map. It is a function of the current "octane number" that the ECU has determined. Seeing no knock the octane number will be 255 and the ECU will run the High maps. If the number gets reduced to 128, the ECU will run 1/2 between the High and Low maps. If the number gets reduced all the way to 0, the ECU will run the Low maps. When the engine starts to produce consistent knock the ECU starts to lower the octane number. When the knock has subsided, the ECU will slowly start to increase the number again. It will try to maintain a safe, low knock condition.

 

<--Holds envelope to temple and exclaims: "8".

<--Rips of the end of the envelope, blows a puff of air into the envelope, pulls out an index card and reads it aloud: "What timing value is in Rob W's peak-torque cells?"


... am I right?

 

lol in a "Dynoflash"

 

He said the peak timing is 13 degrees more than stock low octane map (-5 or so) so pro bably 8 or 9 degrees

 

Yeah, that's basically correct, but to clarify based on what I have seen on my car:

- Somewhere around a knock count of 16-20 the ECU will immediately switch to the low octane maps AND pull additional timing (beyond the low octane timing map) based on the knock count
- the octane number will start to decrease at the same time
- the ECU may switch back to running the high octane map values within the same pull, if knock counts subsided fast enough
- this entire process can occur in less than 10 seconds ... I've logged runs coming out of a toll booth that illustrate this exact sequence of events.

I think MalibuJack summed it up very nicely as to what to look for in your LO map, although personally I have my LO maps pulling timing and fuel all the way down to the 100% Load column, since my car occassionally sees knock during tip-in and I'd rather be safe than sorry. I also pull a small amount of timing and fuel in the 0-100 load range for anything above 6000 rpm - basically mirroring what did with the factory maps to a lesser degree.

l8r)

 

Sorry for the slow response... I am traveling and my last hotel didn't have internet access.

Anyway, if you look at the upper right corner/half of the stock EVO 8 LO timing map, you see a lot of -10's. Mine has a lot of 3's and 4's (NOT a square of 8's! . The lower left half is untouched. I'm kind of interpreting this as a spool-up strategy, but wasn't sure, which is the reason I originally posted. (I hope no one interprets this as vendor bashing, as I'm just trying to learn here)

Of course, in general, the HO map is much more advanced than this, but in a more spotty, unsmoothed way. So, there are actually a couple cells where the LO map may be slightly more timing than the HO map, but I don't think that was necessarily intentional. In fact, I'm hoping I can safely ADD timing in those suspect cells of my HO map, when I finally get a WB.

MalibuJack, thanks for the detailed reply. I need to re-read it a couple times to digest it though. (it's been a LONG day)

To answer one other question: the map was not rescaled at all. The max load column is 260.

Also, I did some logging with EvoScan and found, on the worst of ~6 pulls, a knock count of 4 at about 2500rpm. Most pulls were 0-2 counts at a similar rpm. Based on what I've been learning here, I'm assuming this is nothing to be concerned about.. just random noise.

I appreciate all the detailed discussion from everyone. I'm learning...

 

I wouldn't worry about that area. How can you make a load before 1000 RPM without a turbodiesel V10.

I bet your fine

 

Actually .. the -10's are there for a reason .. I don't understand why people would put it to 3's or 4's .. though like what's mentioned .. you'll never see the engine go to that region of the map ..

if you look at your original map and your LO maps .. you'll notice that you can transition into the -10's map at the loadsite corresponding to higher boost at peak torque rpm (ie 3500-4500rpms) .. my understanding is this is actually boost cut and its most likely a safety feature where you do not want to trespass (unless of course you're running higher boost, higher load at lower rpms etc)

just change the cells that you use or will be using .. and leave the rest that's not used untouched..