[ride5000]

Originally Posted by daemon

Yeah. I always looked at some of those stock maps and thought WTF. But then Subaru has the resources to hire some great tuners, maybe they know something we don't. Hahahahaha... Or maybe the tuners forgot those maps were there and they just ended up being the random garbage that was in the memory chips at the time. Or, sun spots flaring at the time of the ROM burn? (that is a joke)

the reason why subaru's oem maps look the way they do is because the kc map reflects the difference between the best and the worst pump gas--iow, the "octane sensitivity."

this was outlined in the patent application filed by FHI.

ken

[ZuMBLe]

It seems the dynamic advance tables are designed to pull more timing in certain areas if the IAM goes down. The areas with the higher KC values are affected more and the lower kc values less.

Originally Posted by ride5000

the reason why subaru's oem maps look the way they do is because the kc map reflects the difference between the best and the worst pump gas--iow, the "octane sensitivity."

this was outlined in the patent application filed by FHI.

ken

[ride5000]

yes, exactly. that way when the IAM/DAM is low you are effectively on a "low octane" map, and when it's high you're on the "high octane" map. the KC matrix represents an indicator of how much advance the 6-8 octane points buys you at various operating points, or, put another way, how knock prone the engine is at those operating points.

[EQ Tuning]

Originally Posted by ride5000

yes, exactly. that way when the IAM/DAM is low you are effectively on a "low octane" map, and when it's high you're on the "high octane" map. the KC matrix represents an indicator of how much advance the 6-8 octane points buys you at various operating points, or, put another way, how knock prone the engine is at those operating points.

I'm very happy to see other people understand this

To the OP, my maps tend to be smooth but sometimes you have to do something that may be less than "ideal" to get things running propperly. This can sometimes result in oddities in the map.

-- Ed

[WolfPlayer]

Originally Posted by EQ Tuning

I'm very happy to see other people understand this

To the OP, my maps tend to be smooth but sometimes you have to do something that may be less than "ideal" to get things running propperly. This can sometimes result in oddities in the map.

-- Ed

Like a small decrease in timing for fast shifting (drag racing) to prevent knock.

t

[EQ Tuning]

Originally Posted by WolfPlayer

Like a small decrease in timing for fast shifting (drag racing) to prevent knock.

t

Indeed, that is definitely one such instance.

-- Ed

[flatthump]

I usually give quite a bit of authority in the DA tables from 4800-6800RPM. Makes me feel all warm inside.

[SeeeeeYa]

Originally Posted by Dean

So looking at maps, I see a whole lot of spikes, pot holes, jagged/steep walls and plateaus in the stock, Cobb and custom ones I've seen so far. At least in the 3D maps. Most 2D maps are pretty smooth.

I can understand the plateaus on certain maps, but the other stuff is slightly mind boggling. Are people smoothing their maps out. I would think these jaggies and such would make any interpolation the ECU has to do potentially inaccurate or at least imprecise.

For discussion, take the Stage 2 v110 rescaled map which is available for multiple years.:
Dyn Adv. A or B: 200RPM, 1.3-1.9CL Spikes
Dyn Adv. B: 4000 RPM, 2.5-3.4CL Wall
Heck all the advance tables look like some form of jagged mountain range.
WGDC low: 3200-3600RPM Great Wall of steps, etc.

Even though I have a lightened flywheel I appear to have fixed my misfile CELs by smoothing my dyn. adv. tables out a bit. (Though it could have been the intake tuning I did at the same time. I should know better than making 2 changes at once.)

So how smooth are your tables, and any thoughts on smoothing?

The primary ignition table is very nice except for the couple ski jumps in the extended CL section which are excusable and a dimple here and there. Boost targets are also very smooth. Why wouldn't advance, wastegate and fuel tables be equally smooth? (fuel isn't bad, just abrupt cliffs) For those of you who have been doing this a long time, care to share pictures of your maps, comment?

I realize this is an old post, but I'm sure a lot of people fresh to ST have thought the same thing. I know I did.

One of the first things I did was spent an enormous amount of time smoothing those maps . They became aesthetically more appealing to my eye, but the car simply did not work as well. I started from scratch again and it went back to working like it should.

That said, I still, however, adjust a few cells that are not only obviously out of character for the map (talking timing right now) but by monitoring my Knock Learning table I have removed a tendency for negative timing adjustments in the edited areas. So, no, those maps are not perfect, but by and large far better as they are than pretty and smooth.

One thing to keep in mind, the Primary Ignition table is total timing MINUS Dynamic Advance. When you add the Dynamic Advance to the Primary Ignition a more complete 'picture' of timing results, and some of the things you might question go away.