Sorry if the image is kinda on the small side, but I'll do my best to explain. This is currently on my 89 with very good results. I'm back to my aluminum heads and the only thing different about them is that they are ported. The 1.94/1.50 valves are still there.

So now I have set my timing at LV8s >192 to 36 degrees of total timing from 2400 rpms and up. The rest of the spark table I tweaked so there would be no low rpm surging/bucking at low speeds, low loads at 40 mph in high gear with the TCC locked.

For the PE mode spark advance, I changed all the values back to 0 because my spark table is slightly more aggressive that the factory ARAP table. Now it seems to have a bit more mid range torque without having to go into PE mode.

On mid-heavy all the way up to WOT, AF ratio is still the same regardless if you are in PE mode or not; 12.8:1. AF ratio on cruise to light throttle acceleration is a bit on the rich side; 14:1. That's might not be as good for you guys with catalytic converters, but since I have none, it shouldn't hurt anything.

In addition to that, I turned off DFCO mode because it causes a lot of jerkiness once you let off the throttle after 43 mph or 1200 rpms in OD, whichever comes first.

The rest of my modifications are in my sig. Enjoy!

 

 

FWIW,
running the timing @36 flat across the load range from 60-190, and starting @2800and up is quite excessive...was this a fix for low BLM as well? Bucking and surging did not necessarily mean lack of timing. The ARAP stock bin has actually quite a bit in the 60-90 LV up to 2800 (47*@60lv @2800rpm), and should taper down.
I do think it could use a little bump at WOT, but is already giving a max of 27* (not that far off).
The BL's, should be the first thing is to get under control. When you do start tweaking the fueling (maf) tables to attain a 128 blm tune w/the timing table posted, I would predict quite a bit of SK's using that table.
you might want to read this: (scroll down Grumpy's post )
http://www.thirdgen.org/techboard/di...ng-timing.html
and this:
http://www.thirdgen.org/techboard/di...b-tunning.html
A scan will not tell you that you have entered PE, the target AFR change and BLM being locked (learn dis-abled) will. IF you are seeing 12.8 in heavier load ranges, and the BLM is locked (not moving), you are in PE. The setting for load range, if not changed in a ARAP bin is 50lv. to enable Power Enrich.
Load value (min. load value to enable power enrich)and tps% values (max. and min. to enable power enrich vs. RPM), and temperature enable, dictate where power enrich is enabled. Once in PE the 12.8 Target afr is then determined from a calculation based on the table values of power enrich vs rpm, and power enrich vs. coolant, etc.
Using an LM-1 or similar AFR Meter only real way to know real AFR. The target AFR number in scans provide a "calculated" number based on the input of the tables.

The 14.1 targeted afr. mentioned in a lower load range/cruise, and if you are at normal operating temps., other tables have not been changed, and other sources of input (sensors etc.) to the ecm are good, this would not make sense.
If the afr is lower than inputs of other tables (incl. coolant temps etc.) programmed in the tables, and does not meet the tables criteria/values, it would then indicate that it would be operating somewhat rich for normal operating in CL (including Operating temp. etc. etc.) which would also then be providing very low BLM numbers in your scans and should be looked into further.

 

For comparison sakes, I've taken an arap spark table and added in the PE spark for LV8 144 and above to make a total table. The results are shown below.


0000 32.00 48.00 64.00 80.00 96.00 112.0 128.0 144.0 160.0 176.0 192.0 208.0
4800 47.11 47.11 47.11 45.00 40.08 39.02 37.97 36.21 36.21 36.21 36.21 36.21
4400 47.11 47.11 47.11 45.00 40.08 39.02 37.97 35.86 35.86 35.86 35.86 33.75
4000 47.11 47.11 47.11 45.00 40.08 39.02 37.97 35.77 31.90 31.90 31.90 31.90
3600 47.11 47.11 47.11 45.00 40.08 39.02 37.97 38.06 33.14 31.03 31.03 31.03
3200 47.11 47.11 47.11 46.06 41.84 41.13 37.97 40.08 35.16 31.99 31.99 31.99
2800 48.16 48.16 48.16 47.11 47.11 43.95 43.95 45.09 37.00 34.19 32.08 29.97
2400 48.16 48.16 48.16 47.11 47.11 46.06 43.95 45.96 40.69 35.77 31.90 29.79
2200 48.16 48.16 48.16 47.11 47.11 46.06 43.95 44.65 39.72 33.75 30.94 29.88
2000 48.16 48.16 48.16 47.11 46.06 45.00 43.95 42.18 39.02 31.99 29.18 27.07
1800 46.06 46.06 46.06 46.06 46.06 43.95 41.13 42.18 40.07 29.88 26.01 24.96
1600 43.95 43.95 43.95 43.95 41.84 41.13 37.97 35.15 33.04 29.88 26.01 24.96
1400 41.13 41.13 41.13 41.13 40.08 39.02 37.97 36.21 35.15 29.18 23.90 22.14
1200 29.88 34.81 40.08 40.08 40.08 37.97 35.86 33.04 30.93 27.07 23.20 21.09
1000 20.04 29.88 40.08 37.97 35.86 34.10 34.10 28.91 26.80 24.69 20.82 20.82
0800 20.04 20.04 29.88 29.88 29.88 29.88 27.07 26.54 24.43 20.56 20.56 20.56
0600 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.30 20.30 20.30 20.30 20.30
0400 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04

Although, its a little difficult to read you can see the resulting spark in PE and high load will run around 30-36 degrees above 2200 rpm, depending upon rpm and load.

36 may be a bit much for some of the lower rpm load/cells, but won't be too far off. You may want to try ramp up to 36 in a similar fashion as the effective total table (main +PE spark) as I've shown.

Like Mick, I'm also curious about the 12.8 AFR statement outside of PE. Is this your open loop target AFR or is it running that rich also in closed loop with the BLM pegged at 108? In closed loop the AFR target should be stoich (14.73:1) unless also in PE and the blm should adjust to keep it there. PE and AE will add more fuel.

Now I think I understand. Is this 12.8 AFR (presumably from a WB O2) where its running during mid throttle non-PE acceleration while in closed loop with the extra fuel coming from the accel enrichment? That would make some sense now.

 

Yeah, this is all in closed loop. BLMs are really on the richer side, 112 at idle. 124 on light, off idle throttle and cruise, 128 on medium all the way to WOT. After a short run with immediate idle, BLMs will stay pegged at 108 for like a minute or two, then go up to 112 again. Yes, the car seems to run rich at idle. I do have it to run richer than normal so I don't get an occasional backfire from the TB. These lean tip ins drive me crazy. Happens the most when the car just hits closed loop mode at 130 degrees or so. Also, the more retarded the timing, the more chances of TB backfire. Its kinda loud and surprises me every time.

But with this aggressive of a spark table, there has been no pinging yet. But I know it is also true that I like to keep my car running cooler in the 180s.