Hi guys,
Thanks for the suggestions. The remote LED/shift-light will be quite easy to implement. The flat shifting feature is also do-able but will take a bit of time to do well and safely.

I did some testing today with the close loop fuel control feature, which I believe is a first for any piggy-back engine control system. Basically, I've created a new table which intercepts the front 02 sensor and maps it as a function of engine load and RPM. Then, I played around with mapping it, forcing the factory closed loop feedback system to "zero in" on the new desired A/F target. This allows for a richer, more stable idle (esp. those with cams, upgrade intake manifolds, aggressive headwork, etc,.) as well as a leaner cruise for better fuel economy. Another thing I'm fiddling around with right now is smoothening out the transition from low load to moderate load, something that was always a little lumpy with the stock car as it switch from closed to open loop. Pretty neat stuff.

Another thing I'm working on is applying this function to the rear o2 sensor to supress a CEL for catalyst inefficiency. It can actually be done in the harness which would be a nice treat for those who really want to run cat-less.

As for datalogging, here's a portion of one of the datalogs I took today while revving the car in neutral. Check out the sampling rate :

Time (s) RPM 02 in Calc Torque Knock Count
0 877 0 0 0
0.01 876 0 0 0
0.02 876 0 0 0
0.03 875 0 0 0
0.04 870 0 0 0
0.05 870 0 0 0
0.06 870 0 0 0
0.07 870 0 0 0
0.08 870 0 0 0
0.09 870 0 0 0
0.1 870 0 0 0
0.11 871 0 0 0
0.12 871 0 0 0
0.13 871 0 0 0
0.14 871 0 0 0
0.15 869 0 0 0
0.16 869 0 0 0
0.17 869 0 0 0
0.18 873 0 0 0
0.19 876 0 0 0
0.2 876 0 0 0
0.21 877 0 0 0
0.22 880 0 0 0
0.23 880 0 0 0
0.24 880 0 0 0
0.25 877 0 0 0
0.26 877 0 0 0
0.27 877 0 0 0
0.28 875 0 0 0
0.29 874 0 0 0
0.3 874 0 0 0
0.31 873 0 0 0
0.32 873 0 0 0
0.33 873 0 0 0
0.34 873 0 0 0
0.35 871 0 0 0
0.36 871 0 0 0
0.37 871 0 0 0
0.38 870 0 0 0
0.39 870 0 0 0
0.4 870 0 0 0
0.41 869 0 0 0
0.42 869 0 0 0
0.43 869 0 0 0
0.44 869 0 0 0
0.45 872 0 0 0
0.46 873 0 0 0
0.47 873 0 0 0
0.48 877 0 0 0
0.49 881 0 0 0
0.5 881 0 0 0
0.51 881 0 0 0
0.52 881 0 0 0
0.53 881 0 0 0
0.54 881 0 0 0
0.55 878 0 0 0
0.56 878 0 0 0
0.57 878 0 0 0
0.58 877 0 0 0
0.59 877 0 0 0
0.6 877 0 0 0
0.61 877 0 0 0
0.62 877 0 0 0
0.63 878 0 0 0
0.64 878 0 0 0
0.65 875 0 0 0
0.66 874 0 0 0
0.67 874 0 0 0
0.68 873 0 0 0
0.69 869 0 0 0
0.7 869 0 0 0
0.71 869 0 0 0
0.72 868 0 0 0
0.73 868 0 0 0
0.74 868 0 0 0
0.75 868 0 0 0
0.76 869 1 0 0
0.77 869 1 0 0
0.78 868 1 0 0
0.79 867 1 0 0
0.8 867 1 0 0
0.81 867 2 0 0
0.82 869 3 0 0
0.83 870 3 0 0
0.84 870 3 0 0
0.85 870 4 0 0
0.86 869 4 0 0
0.87 867 4 0 0
0.88 867 4 0 0
0.89 867 4 0 0
0.9 863 4 0 0
0.91 863 4 0 0
0.92 863 4 0 0
0.93 852 4 0 0
0.94 842 4 0 0
0.95 842 4 0 0
0.96 842 4 0 0
0.97 815 4 0 0
0.98 812 4 0 0
0.99 812 4 0 0
1 826 4 0 0
1.01 845 4 0 0
1.02 845 4 0 0
1.03 868 4 0 0
1.04 921 4 0 0
1.05 921 4 0 0
1.06 952 4 0 0
1.07 1006 4 0 0
1.08 1006 4 0 0
1.09 1073 4 0 0
1.1 1096 4 0 0
1.11 1121 4 0 0
1.12 1179 4 0 0
1.13 1179 4 0 0
1.14 1252 4 0 0
1.15 1257 4 0 0
1.16 1312 4 0 0
1.17 1331 4 0 0
1.18 1385 4 0 0
1.19 1404 4 0 0
1.2 1454 4 0 0
1.21 1471 4 0 0
1.22 1523 5 0 0
1.23 1539 5 0 0
1.24 1597 5 0 0
1.25 1609 5 0 0
1.26 1648 6 0 0
1.27 1648 6 0 0
1.28 1673 6 0 0
1.29 1694 6 0 0
1.3 1735 7 0 0
1.31 1755 7 0 0
1.32 1786 7 0 0
1.33 1820 7 0 0
1.34 1839 7 0 0
1.35 1872 7 0 0
1.36 1898 7 0 0
1.37 1922 7 0 0
1.38 1954 8 0 0
1.39 1988 7 0 0
1.4 2012 7 0 0
1.41 2040 8 0 0
1.42 2078 7 0 0
1.43 2105 8 0 0
1.44 2130 8 0 0
1.45 2160 7 0 0
1.46 2195 6 0 0
1.47 2223 4 0 0
1.48 2248 4 0 0
1.49 2275 2 0 0
1.5 2313 2 0 0
1.51 2342 2 0 0
1.52 2368 1 0 0
1.53 2393 1 0 0
1.54 2413 1 0 0
1.55 2431 1 0 0
1.56 2440 2 0 0
1.57 2443 2 0 0
1.58 2443 2 0 0
1.59 2435 1 0 0
1.6 2435 1 0 0
1.61 2435 1 0 0
1.62 2433 1 0 0
1.63 2433 1 0 0
1.64 2430 1 0 0
1.65 2426 1 0 0
1.66 2422 1 0 0
1.67 2421 1 0 0
1.68 2421 1 0 0
1.69 2416 1 0 0
1.7 2416 1 0 0
1.71 2411 1 0 0
1.72 2410 1 0 0
1.73 2406 1 0 0
1.74 2399 1 0 0
1.75 2396 1 0 0
1.76 2383 1 0 0
1.77 2373 1 0 0
1.78 2361 2 0 0
1.79 2349 3 0 0
1.8 2339 4 0 0
1.81 2322 5 0 0
1.82 2309 6 0 0
1.83 2296 6 0 0
1.84 2284 7 0 0
1.85 2276 7 0 0
1.86 2270 7 0 0
1.87 2279 7 0 0
1.88 2286 8 0 0
1.89 2295 8 0 0
1.9 2295 9 0 0
1.91 2310 9 0 0
1.92 2325 9 0 0
1.93 2340 10 0 0
1.94 2358 10 0 0
1.95 2377 9 0 0
1.96 2394 10 0 0
1.97 2413 10 0 0
1.98 2440 11 0 0
1.99 2464 11 0 0
2 2492 11 0 0
2.01 2514 11 0 0
2.02 2543 12 0 0
2.03 2569 12 0 0
2.04 2601 12 0 0
2.05 2631 12 0 0
2.06 2658 13 0 0
2.07 2692 13 0 0
2.08 2721 13 0 0
2.09 2760 15 0 0
2.1 2791 16 0 0
2.11 2828 16 0 0
2.12 2860 17 0 0
2.13 2901 17 0 0
2.14 2935 18 0 0
2.15 2935 18 0 0
2.16 2979 19 0 0
2.17 3024 18 0 0
2.18 3075 18 0 0
2.19 3119 18 0 0
2.2 3164 19 0 0
2.21 3210 20 0 0
2.22 3253 19 0 0
2.23 3303 21 0 0
2.24 3353 21 0 0
2.25 3400 21 0 0
2.26 3451 22 0 0
2.27 3498 21 0 0
2.28 3554 22 0 0
2.29 3604 22 0 0
2.3 3656 24 0 0
2.31 3707 23 0 0
2.32 3757 22 0 0
2.33 3801 24 0 0
2.34 3604 22 0 0
2.35 3860 23 0 0
2.36 3906 23 0 0
2.37 3956 25 0 0
2.38 4013 25 0 0
2.39 4054 24 0 0
2.4 4104 26 0 0
2.41 4151 25 0 0
2.42 4211 26 0 0
2.43 4254 26 0 0
2.44 4306 24 0 0
2.45 4345 27 0 0
2.46 4404 24 0 0
2.47 4447 28 0 0
2.48 4493 26 0 0
2.49 4541 28 0 0
2.5 4589 27 0 0
2.51 4386 27 0 0
2.52 4642 28 0 0
2.53 4687 28 0 0
2.54 4729 27 0 0
2.55 4773 28 0 0
2.56 4819 29 0 0
2.57 4879 28 0 0
2.58 4939 28 0 0
2.59 4939 30 0 0
2.6 4981 29 0 0
2.61 5020 31 0 0
2.62 5067 31 0 0
2.63 5113 31 0 0
2.64 5154 31 0 0
2.65 5194 32 0 0
2.66 5238 31 0 0
2.67 5276 31 0 0
2.68 5323 33 0 0
2.69 5362 33 0 0
2.7 5403 32 0 0
2.71 5453 33 0 0
2.72 5488 34 0 0
2.73 5529 33 0 0
2.74 5529 33 0 0
2.75 5577 34 0 0
2.76 5613 35 0 0
2.77 5651 33 0 0
2.78 5688 33 0 0
2.79 5737 32 0 0
2.8 5776 33 0 0
2.81 5818 34 0 0
2.82 5850 35 0 0
2.83 5899 35 0 0
2.84 5933 33 0 0
2.85 5979 34 0 0
2.86 6012 34 0 0
2.87 6050 34 0 0
2.88 6093 34 0 0
2.89 6093 35 0 0
2.9 6121 35 0 0
2.91 6169 36 0 0
2.92 6201 34 0 0
2.93 6244 36 0 0
2.94 6275 34 0 0
2.95 6311 34 0 0
2.96 6356 34 0 0
2.97 6388 33 0 0
2.98 6414 32 0 0
2.99 6448 31 0 0
3 6494 30 0 0
3.01 6511 29 0 0
3.02 6540 28 0 0
3.03 6568 28 0 0
3.04 6568 27 0 0
3.05 6585 26 0 0
3.06 6615 28 0 0
3.07 6634 25 0 0
3.08 6653 25 0 0
3.09 6684 26 0 0
3.1 6697 24 0 0
3.11 6718 25 0 0
3.12 6726 26 0 0
3.13 6750 23 0 0
3.14 6763 21 0 0
3.15 6776 22 0 0


315 samples in just over 3 seconds. Imagine the fun we can have with that

Cheers,
shiv

 

Great!!!

Thow I'm afraid that my head would blow up with data logging that's that fast

 

The back O2 fix sounds pretty awesome!

 

Very impressive. I wish some of the data loggers I had used in the past at work would have done those short time intervals.

 

/head explodes in thousands of mini shivs...............


numbas, numbas, everywhere..

 

I'm surprised no one noticed the titles in one of the log columns. Calculated torque

shiv

 

explain that one please.

Thank you
Eric

 

Can or will all of the data be able to be viewed in realtime or must it be logged, then reviewed?

 

I am more and more convinced that I bought one bad-*** computer setup. Not that I needed convincing anyway, but this is somm pretty cool ****. Of course if I understood half of it it would be even cooler..........

Maybe we need a Shiv's Xede users 101 for those idiot Xede owners like myself out there who do not even have a clue as to the capabilities of the system. It seems like more and more cool stuff is being added, I just do not know what a lot of it does and how it will help by doing what it is doing. Keep up the R&D though, we'll figure it out!

 

Will XFlash tuner have any of these capabilities?

 

JC,
Thank god for those mean, labor-expoiting Englishmen three hundred years ago who invented the modern market system, complete with the practice of "division of labor." With it, Shiv can be the master of performance engineering, while I can become an expert on "special education manifestation determinations." I have no need to understand all the stuff Shiv is up to. I'll just use it when it is available.
Smog

 

Shiv, great stuff, however one issue with leaning out the cruise is that you will put the catalyst to 'sleep'. Meaning that the cat needs those little rich/lean swings around stoich that it gets when in closed loop. The swings (or 'cross counts') let the catalyst catalyze effectively. That also means that the CEL for catalyst inefficiency will also occur even with a cat, if the lean cruise is active.

I'm not sure what this (prolonged lean / no cross counts) does to catalyst life, I'm thinking in terms of the loading/plugging effect that happens when the cat sees the alternate situation of prolonged rich / no cross counts.

Anyway, something to think about.

 

If you lean out the mixture in closed loop, the ECU (what is really in control) will just compensate by making the mixture richer. Up to 12.5%. After 12.5%, you can mess with it, but the transition from closed loop to open loop and vice-versa will be rather harsh.

 

The EVO ECU has an authority range of 25% so trying to "force" a certain a/f ratio by manipulating MAF is going to result in huge hesitations when going from closed to open loop. This is why we revised the software/firmware of the XEDE to intercept the o2 sensor signal before it goes into the XEDE. We can then bump the raw voltage up or down (as we do with MAF, MAP, etc,.) and force the factory computer to "zero in" on a new AFR without it knowing any better. We can even keep short term correction close to zero by accompanying the o2 offset by a complementary MAF offset. The nice thing about this method is that ALL of the factory temp, baro, correction, cold start, hot start, etc,. compensations are still in effect and drivability remains perfect.

My 2c,
shiv

 

If we dictate the value of the front o2 sensor, we can dictate the value of the rear o2 sensor and ensure that there is the appropriate voltage delta between them-- thus keeping the cat inefficiency CEL from ever coming on-- cat or no cat.

Neat huh?
Shiv