Megasquirt maps?

[iamcreepingdeath]

Howdy ladies and gents.

Is anyone willing to share with me the maps they are using for their turbo M30? I am trying to get a good starting point. My setup is M30B35, holset HX35, TRE 42 lb injectors, running wasted spark.

Thanks

[tschultz]

You want an ignition map or a full msq tune? Some ignition maps are posted on the megasquirt thread by Brad D and some in my turbo thread. You can use the thread search tool to find results quicker.

[iamcreepingdeath]

You want an ignition map or a full msq tune? Some ignition maps are posted on the megasquirt thread by Brad D and some in my turbo thread. You can use the thread search tool to find results quicker.

What does a "full msq tune" consist of? AFR1 table, VE table, and spark table? Then there is a bunch of other setting I suppose. I guess what I am looking for is a good starting point for all the tables I need. I did copy the tables from Brad D, but without talking to him, I didn't confirm that those are the tables he ended up using, and I think I plan to run more boost than Brad D did.

I ran through the megasquirt setup manual, I cal'd all sensors, I set up timing and got it dialed in, set up fueling calcs table, cal'd idle, etc, and copied the tables from Brad D. Runs ok, but won't build much boost, and seems like it's fuel limited when it does build boost, and I'd like to sanity check my tables against other known working tables that people have.

I'll search for your thread, thanks!

[turbodan]

What do your AFR's look like when it's struggling to make boost?

Tables are one piece of the tune but there are a lot of other settings that need to be correct as well. Post your advance table and we'll see how it looks.

[iamcreepingdeath]

So a buddy and I did some tuning yesterday, and got it running pretty well. No boost controller, just a 11psi limited wastegate. Only real issue I still see is a rich condition when cruising at low load and low rpm. Not sure why, as the AFR target table specifies around 14 AFR around that region. Anyway, here is my AFR table:



And here is the fuel VE table once we got it running ok. I expect there is plenty of areas here that need fine tuning. If you see an issue, please let me know!



And here's the spark advance table.

[turbodan]

The fuel table needs work, it should have a fairly consistent slope downward toward the bottom, the slope on yours changes dramatically below 40-50 kpa. If you look at it in the 3d viewer you'll see what I mean. A little curvature overall is okay, the intake manifold tends to fill in the middle kpa region and attenuate the upper kpa region, but it should not take a nose dive down toward the bottom. There should also not be any points where a lower kpa bin has a higher fuel value than a higher kpa bin in the same column.

I suspect it's rich in the 40-50 kpa region and lean in the 15-20 kpa region. If you're relying on the AFR table to tune it off of 02 feedback it's going to have a hard time unless you're running it long enough in these regions to let it dial in. If the RPM and load are varying while it moves through most of the map it's never going to sort itself out. There are different ways to utilize the AFR table with or without closed loop operation so I'm not sure how you're set up. Even in closed loop your fuel table has to be close or it will constantly be chasing after the fuel trim trying to get it to the target.

The VE curve should be reflected in your fuel map from top to bottom. The highest values will be around peak torque and they will taper off above and below that. If you had a dyno chart, your fuel map should follow the torque curve pretty closely. Ignition timing will reflect the VE curve as well, you can dial in more advance in the 2000-3000 RPM range, pull it back a bit through peak torque and feed some back in above that. The ignition map should feature some vacuum advance as well, 10-15 degrees more at low kpa VS atmospheric.

I don't worry about a tenth of a degree, step it up or down in at least .5 degree increments. A few tenths is an insignificant difference unless you're fine tuning like the manufacturer does for absolute minimum emissions. Lastly, you want to set your x axis bins on the fuel and ignition maps where they are best suited to the engine. If you have peak torque at 3200 RPM, make sure you have a point on the horizontal axis at the point on the tables. These are inflection points and it is very useful to place bins there to get the best fit to the curve. I also label points where I find myself needing to make adjustments. If you often cruise at 1700 RPM around town or 2700 RPM on the highway, set bins there so you can adjust precisely to those points.

[iamcreepingdeath]

Thanks for your input! I will re-jigger the map accordingly!