Quote: Originally Posted by RBob When the EGR is active there is a 12 line table of BPC's that is used. It is vs. manifold vacuum (not pressure). Table is at $2A1. Note this is for the '8746 ECM. RBob. Another BPC table??, that I didn't know . . . that complicates things. So you're saying that while I've been out datalogging with the BPW raised, EGR may be active, so the fact that I raised the BPW constant is being overridden by the "BPC when EGR off" table? I don't see any table by that name in my TunerProRT xdf file. Is that something that has to be patched? Is there a way I can tell if EGR is active? I see Flags in WinAldl for the AIR solenoids, but not any for EGR. How do I shut off EGR to see if that is my problem? Can I do that by maxing out the "EGR On" parameters so the engine can't get into EGR? So let's say the BCP EGR table is my issue. If I turn off EGR, raise BPW and get my blm's back in line, then go back and turn EGR back on (for fuel mileage), won't I be right back where I stated. Seems like the solution is to to fix the BPC EGR table.

Seems like the solution is to to fix the BPC EGR table.


BINGO!!!

The "BPC when EGR off" is a constant, the one you've been tweaking. There is a table of BPC values for when the EGR is on. If tunercat doesn't have it shoot an e-mail their way they are very good about adding things like that. In the mean time set the EGR temp enable temps to something sky high and see if that is your problem.

I got EGR turned off now, things seem to be much better. VE's all between 126-128. After a few iterations I got WOT to be completely flat at 12.5:1 across the whole rpm range. Now I need to get back to fixing AE.

One quick question about AE: Some of my VE's are now in the upper 90's. Can the VE table limit AE if you're close to 100%? I think it might be time to crank up my FP and adjust BPC to get some headroom.

Just having your VE in the 90% range doesn't necesarily mean your injectors are going static. You could be going static, or you could have 30% headroom. Your AE will be added on top of whatever PW your VE and BPC result in. Keep in mind on stock code that AE is injected Asynch, what this means is that it's injected on a schedule of every 12ms instead of on every ignition signal. Asynch is complicated beast and takes some reading to completely understand. Best to output your PW and check the result of your tune..

I got the PW patched into the PromID field of the datastream. So now I export the log file to excel and do the math => promid x .01526 + injector bias = pulse width. I just want to confirm that the injector bias value is the "PW - Injector bias added to pw (sync)" constant in my TunerPro XDF file. Is that correct. If so, then my bin has that constant set to 0 usec. Does that sound right?

I see that total spark advance can also be patched into the datastream as well. If PW is already being reported in the PromID field, is there another field that spark advance can be patched into so both can be logged simultaneously? That would be great to have both in the same log.

I got the PW patched into the PromID field of the datastream. So now I export the log file to excel and do the math => promid x .01526 + injector bias = pulse width. I just want to confirm that the injector bias value is the "PW - Injector bias added to pw (sync)" constant in my TunerPro XDF file. Is that correct. If so, then my bin has that constant set to 0 usec. Does that sound right?

I see that total spark advance can also be patched into the datastream as well. If PW is already being reported in the PromID field, is there another field that spark advance can be patched into so both can be logged simultaneously? That would be great to have both in the same log.

I usually patch it into some non-vital place. The IAT works well for me.

You are correct on the math, and yes some bin's don't have an injector bias.

You can out put the spark into any of the sensor channels, Jprevost posted a .xdf that was nothing but aldl stuff so you could completely change what got put into the data stream, the only problem is that winaldl does some math to most of the channels so outputing your spark advance in the voltage field gives you some funky numbers that are hard to convert. If your using tunerpro to log, then it's easy to change the math.

Fast, can you walk me through how to patch the spark into the IAT channel? In know that if I used the PROM id channel, I would need to modify the following addresses and change the values as shown below?

addr: Value:
$D414 $00
$D415 $61
$D416 $00
$D417 $62

What addresses do I go to and what should they be changed to? I actually would prefer to not use IAT since I look at that temp fairly regularly in my log files.

Thanks

Here are a couple of locations that I like to use:

To put SA in IAC steps: change address $419 to $62 (was value $FD)
To put SA in INTegrator: change address $425 to $62 (was value $A2)
To put SA in knock Cnts: change address $435 to $62 (was value $69)
To put SA in Battery Volts: change address $431 to $62 (was value $40)

The first three typically won't have math done on them. The BatV may be divided by 10, if so just drop the decimal point.

The reason for only needing to patch in the value $62 is that 99.9% of the time the SA will be BTDC. It will only use both bytes when the SA is ATDC (retarded).

Note these locations are for the '8746.

RBob.

Thanks RBob, that's exactly what I was looking for. I'll give that a try.

It's been a week or two since I've had time to do any more tuning. Anyway, I got pulsewidth and spark advance patched into my datastream. I've also tapped into the spark retard signal coming from the ESC module and wired it to the 0-5 volt user defined channel of my ZT-2 wideband oxygen sensor to monitor when knock is occurring. The ESC signal is normally a flatline 9 volts. When knock is detected, the volage drops in proportion to the amount of knock detected. Once the ECM pulls timing out and knock goes away, the voltage goes back up to 9 volts. I made a little voltage divider to drop the voltage down to about 3 volts for the ZT-2. So now when I datalog, I simultaneously log with WinALDL to get all the sensor data AND with the ZT-2, which records AFR, rpm, MAP, TPS and ESC signal. It really helps see where knock is occuring and how much timing is being pulled out.

I've attached a snapshot of a log showing both the wideband data and the WinALDL data for a WOT blast. The screen shot show up through 3rd gear. You'll notice a few things:
1. Still have nasty lean spikes during shifts (see ARF on top trace of the graph). I need to keep working on PE.
2. A missed 2-3 shift (that's the double clutch in the middle of the trace). Back to driving school!
3. Thee instances of knock. (see the bottom trace that says "2.84 User 1"), These are the three downard spikes. Height of spikes is proportional to the amount of knock. The last one happend during the missed shift. If you look at the WinALDL data you will also see the knock coutner increment and pull out timing.
4. The ESC signal gets a little dirty at higher rmp's. You can see the signal getting fuzzy instead of a nice flat line. Not sure if I'm on the ragged edge of knock, or maybe starting to pick up false knock??

So a little more work on PE and SA to squeak out a bit more performance. Hope to make a trip to the track next week to get some times.

91RockS

That is cool that you are getting all that data like that. And getting good results.

And thanks for the PM.

$226 and $227 filter coef. in the ANLU hac being lag i would assume the values ($226 = 20 and $227 = 36) are in time? Possibly Usec ? (V = 15.260000 * X + 0.000000) If so, i come up with Cold Filter ($226) = 305.20 Usec and Warm Filter ($227) = 549.36 Usec. IS this correct?

Where can i find a good tunner in md baltimore area?

Ihave a 91 z28 5.7 liter 9.5 pistons heads worked polish ported 3 angle job cam(lift not sure)computer stock, chip stock.injectos stock. where sould i start? with a reprogram,HELP PLZ!!!! NEW MOTOR!!

help plz.Ihave a 91 z28 5.7 liter 9.5 pistons heads worked polish ported 3 angle job cam(lift not sure)computer stock, chip stock.injectos stock. where sould i start? with a reprogram,HELP PLZ!!!! NEW MOTOR!! Plus can find out how to post a new post TY Jason..