Ok, thanks. So the the final/bottom/max value of that table would be something like 306(kPa)/315 load% correct?

 

The max value is the maximum of your map sensor and then you should be able to get a feel for where the other values go by plotting MAP in maptracer so that you can see approximately what MAP value corresponds to what load value.

As for getting the cruise dialed in there isn't anything particularly special. Just drive and keep adjusting until the car feels snappy and your fuel trims are fairly close.

 

So, I shouldn't put the maximum load/kpa of my car, but the actual max of the map sensor (omni 4 bar), even though I'll never hit that boost/load? When you say log MAP, you are referring to the map sensor I'm assuming and not Baro or other form of a logging item? Also, is it best to to have higher resolution for lower loads, say up to 100, and then do some bigger jumps?

 

You use the max value of your map sensor. I think the way how it's coded is that your load won't go over the last column, so you want some margin of safety. You don't want to overshoot your last value and not get the proper fueling, etc.

I believe John mentioned this in one of the SD threads that he created.

 

Sorry for all the questions...I'm trying to read all the threads about SD, but each one is 20 to 60 pages long and I get lost. Trying to figure out what pertains to me and so one and so forth. I've heard it's easy to tune once you know what you're doing and what the numbers represent.

That makes sense about the max value- thanks for the explanation. As far as resolution/scaling goes, you only have 8 lines/values to have everything smoothed out, so do you focus a majority of lines to daily driving and only a couple max values to WOT?

 

You'll have to just have some experience to know where you need resolution for a specific car. If you have trouble in an area then go ahead and add resolution but really my settings aren't terribly far off from linear and I believe that jcsbanks even played around with using a linear scale just for fun and found that it worked pretty well. Personally I have slightly more resolution in the cruise area and also in the 220-270 load area where I have a maximum load right now of around 260, if I was flowing more air then I would move that up. Honestly I don't need the extra resolution up top though, I just used it because there really are more cells than necessary for a setup like mine.

 

Here is what I "think" my max load/kpa should be (screen shot). I have left everything else alone so far- not ready to fully convert yet (obviously )

I'm running the omni 4 bar, so the kpa is correct (I added 14.5 to the 43psi max of the sensor), but as far as the load % goes, I will never hit that, but as mentioned earlier, it is good to have a safety margin. The one thing I don't understand, is that how could it go as low as 10 kpa when I thought you added atmospheric to it, so the lowest should be 14.5/14.7 right (or 101kpa)? I know I'm missing something here that would really simplify for me. I'm pretty sure I'm trying to think too deep into this.

 

^You're missing that our cars run in vacuum at part throttle, idle, decel, etc.

 

Would you use the first 6 lines for daily driving and the last 2 for WOT or leave more lines for WOT?

 

Ya know what,,,,fudge it. I'm just going to roll with what I got set. I can't decipher the computer lingo on this thread. I'm just a normal dude who tunes his car. I figure, go with what came with the downloaded file, and adjust as necessary. I'll figure out what works, and what doesn't. I appreciate the explanations, but they are over my head. I'm looking for a simple break down of what the numbers mean, how to adjust and so on. A screenshot of somebody using a omni 4 bar with settings would be perfect, but I don't know how many people are running that combo. Of course mods will come into play....just looking to put 2 and 2 together. Wish me luck in the next week or so.

 

Leftmost cell should be around 10kpa. You'll likely idle at around 20+kpa but you need it to be low in case you are stalling out or something is going wrong. Make the second from right about 20 higher load than you expect to hit as your maximum. Leave all the cells along except for those two highest cells and alter from there. Generally the kpa line should just stay the same and then go ahead and adjust the load up or down based on what you see in your logs. After you've played with it for a bit then you can start adjusting each side as you see fit. It is probably best to just jump in and start playing because it will really help make everything click together. My car idled, drove, and boosted well enough to be driven safely with preset values and my car isn't even an evo.

For reference these are my numbers but don't copy them because my motor is nothing like yours.
RPM VE
96.0938
96.875
99.2188
100
100
100
100
100
100
100
100
100
99.2188
96.875
95.3125
92.1875
90.625

 

^ Thank you so much for the explanation- makes much more sense now. Much appreciated.

How do you figure out the load percentages? Or are they actual load values that's registered under 2byte?

 

Here are the settings that I used for the Omni 4-bar. If you are using the Omni 4-bar, you have to make sure that you map 16bit scaling is ECUFlash is set correctly. It should be:

That being said, these were my settings when I was running the Omni 4-bar for SD. As others said though, these may end up being a bit different for your car, but it can give you an idea:

Map VE:
RPM VE:
90
95
95
97
97
97
100
100
100
96
96
96
96
94
92
88
87




Eric

 

Awesome! Thanks. As far as the load% numbers on the right column, are those numbers actual load or a percentage of load? If it is a % of load, how do you figure out the %?

EDIT

I think I'm starting to understand this now. Correct me if I'm wrong please. If you have a value of 60 in the load% column and 70kPa in the kpa column, that value of 60 came from the equation of 408*60%=244 load. So at 244 actual load the user was seeing 70kpa during logging. Is that the correct way to interpret this?

EDIT

As far as the VE/RPM table, that is used to adjust fuel trims if I understand that correctly.

 

No, you're a little confused. 70kpa isn't even at 0 boost yet...it is in vacuum.

Your map VE table is mapping a map value (absolute pressure in kpa) to what load you are seeing. So, at 70kpa absolute, if you are seeing 60 load, that is what you put in that table (assuming your RPM VE at that point is 100%).