new $EE tuning thing!

[Terminal_Crazy]

Anyone had any success playing with the new O2 Tools?

I've messed around a little but can't make any subjective opinions on any changes I've made.
It seems to very hard to tell much difference when altering settings.



TIA
Mitch

[kur4o]

Make sure you burn the bin with the latest .exe and there is a check box on right up side of the 02 controls window, that needs to be checked.
I remeber I did a quick beta test and all of the 02 trims worked as expected. Doubled checked with direct memory dump, so they changed the values when commanded. These settings are slow acting and will take some time to see the input. When you uncheck the enable box the last settings will be in effect untill you zero them with the boxed checked, or turn the ignition off.

I never experienced any dtc, only a brick situation with a single bit off error.
There is a possible condition that will have random dtc set for a split second, but that`s not your case.

[Terminal_Crazy]

Hi

Been reading up on the EOIT settings

Can you clarify the TDC position... I'm guessing 0 timing is TDC at compression ?

This is the Stock 1995 Z28 table.

DegC Deg Hex TDC+
spk btdc
0 0 0 TDC
-40 2 20 180 180 bottom of power stroke ?
-28 2 20 180 180
-16 2 20 180 180
- 4 2 20 180 180
8 4 40 360 0 TDC exhaust
20 4 40 360 0
32 4 40 360 0
44 4 40 360 0
56 5 50 450 90 90ø down on intake stroke ?
68 5 50 450 90
80 6 60 540 180 BDC (Bottom of intake stroke?
92 6 60 540 180
104 6 60 540 180
116 6 60 540 180
128 6 60 540 180
140 6 60 540 180
152 6 60 540 180


Each 90ø is covered by 16 points so 5.625ø == 1Hex value
My cam is about 56 degrees overlap guestimating 34+ degrees bigger than stock
6 x 5.625 = 33.75
7 x 5.625 = 39.375
so try adding 6 ... should have it at 573.75

So fired it up let it idle for a while to warm up
then played with EEhack eoit settings
The table opens with a value of 270 which i guess is a 3 (30H) on the table.

Moving the slider affected the fueling until CL settled down again so it is working.

Initially I moved the slider a few points at a time without major improvement
dropping the slider down to 96 seemed to give the smoothest fueling
So I stepped 90 degrees at a time and reset BLM's each time until it settled...

BLM's were
96 110 120 & 113 121
186 121 123
276 105 128
366 108 128
456 108 128
546 108 128
636 108 128
714 113 131 & 108 134

With Control off (back to 66H)
Resetting BLM's several times settled on
118 121
120 121
123 124

engine temp down to about 86C but smoking & spitting water - crap throttle, response boggy and hesitant.

I've not driven the car yet, it's too cold wet and dark.
I'll see if i get 5 mins tomorrow.

Anyone else played with these settings yet?


Thanks
Mitch

[Terminal_Crazy]

@ kur4o:

Hi, Can you clarify some EOIT numbers please.

EOIT is degrees ( Reference periods and fractions of 90 degrees) ATDC on compression.

Stock LT1 has 6 in the table so would be at 540 degrees which would be at bottom of the intake stroke.
IF B&Y cars are 270 degrees that would be 7 in the table?

You say the table's highest figure is 6F which is 7 reference periods.

On EEHack the Overide table will adjust from 96 degrees to 714 degrees.
Does this mean the table starts at 90 degrees or your slider values are off ? 7x90 = 630 max ?

Does this table have an offset similar to the HPTuners thread where it's referenced from -784 ( 2 revs, 720 and -64 degree offset) ?

I've just realized that it could be the XDF I'm using to view it that's incorrect but all versions I have seem to have the same parameters.


Thanks
Mitch

[kur4o]

This graphic should explain it all.

The red line is the injector firing.
You can see the open event vary based on the commanded pulse lenght but the close event will be at the exact value specified at the table.
If you want to fine tune, you should factor the time the fuel needs to evaporate also.

The built in limit of 6f is a software limiation, the PCM might freak out if you go over it.

You can chart your cam specs in the chart and see where is the overlap and make a tuning startegy from there.

I charted the gm846 cam here.

Green -yellow is the overlap at 0.05 lift. 4 degrees in total
Blue -red is the total overlap.

I am still looking for complete specs of stock gm b-body cam.
It will be very good source how gm tuned it. As you can see the compression in the cylinder already.

[Terminal_Crazy]

Sorry, I'm having difficulty matching the values.

I was really after clarity on the numbers as they dont match with EEHack's control panel.
The control slider adjusts from 714 to 96. Should it not start from ZERO?

It states degrees ATDC of the cylinder fire event so I presume it counts in hex in 16ths of 90 degrees starting at zero?
1995 LT1 Z28 has 6 or (Hex60) in the table when hot. That would be 540 degrees, ( 360+_180_ or 6*90).

What does the B & Y body have in the table to get 270 ? I see it would need to be a 7 (6F MAX) ( 360+270 or 7*90 = 630)

What is the degree value of each value in the bin?
and can you confirm it starts at ZERO?


Thanks
Mitch

[kur4o]

720 - [value] * 5.625

value = table value converted in decimal.

That is the formula to convert the table value to degrees.
You start at $01[ pcm will not like zero] and go to $6f max value.

At ideal conditions $00 should be 720 degrees and $80 sholud be zero degrees.
0-720 = $80-$00.

At some point the counter should reset and start again at $80.
That`s could be the reason to not go beyond 6f. The PCM might freak out.