Injection Timing Assistance Requested

[Paz]

Right, this may or may not explain why mine is smelling pig rich at idle (really hope it is).

I'm running the attached at present, seems good on the road driving but like i said, i cannot for the life of me lean out idle (but could be also due to cam), it's hitting min pulse width for injectors (1.1 or so ms) but still reading 12.5 at idle up to about 13.5 on WB, adjusting VE does not improve it.

My Normal EOI Target Adder vs. ECT is at present-
230 230 230 230 230 230 185 140 140 110 110 110 110 110 110 110 110


So, i should adjust my boundary to 520 and have a play with the ECT by reducing it to the one number across the board whilst letting it idle taking note of WB to see improvements, once i have this sorted use that one number across the board in ECT and redo my boundarys with new ECT in spreadsheet, sound right?

[07GTS]

u have a fair amount of overlap but try what u have but change the ECT to 85, also the IPW should be able to go lower if u cant get to stoich at idle that will help with the smell alot just try lowering min PW to like 0.5 see if that helps for getting it lower

[Paz]

u have a fair amount of overlap but try what u have but change the ECT to 85, also the IPW should be able to go lower if u cant get to stoich at idle that will help with the smell alot just try lowering min PW to like 0.5 see if that helps for getting it lower

Yes it does have a lot of overlap, does not help the rich idle at all (goes damn well though lol).

So the entire "Normal EOI Target Adder vs. ECT" table to 85 GTS?

My min pulse width is already at 0.125 unfortunately.

[07GTS]

yea try at all 85 or if u like just the operating temps if cold start is ok as is but can just try it and see, something dosnt seem right if u cant get idle below 12.5 - 13.5 AFR u on petrol..? something stopping it from going lower..?

[Paz]

yea try at all 85 or if u like just the operating temps if cold start is ok as is but can just try it and see, something dosnt seem right if u cant get idle below 12.5 - 13.5 AFR u on petrol..? something stopping it from going lower..?

Cold starts are good but i'll try it out, can't hurt thank you.

Yep running 98, it's hitting the min pulse width allowed by the offset table, adders etc i think. Lowest i have ever seen it at idle is about 1.1ms, during decel have seen pw down to about 0.7ms in logs.

[07GTS]

the offsets help the injector pulse they shouldnt stop it from going below a set point unless they are too high..? sounds like u have bigger injectors so u should be able to go lower then 1ms i would think, so even removing more from maf/ve it still dosnt get back to stoich at idle..?

[GHuggins]

Min pulse width settings need to be lower on top of fueling needing to be dialed in. Put .125 in min tables then dial in maf and VE

[schpenxel]

Yeah drop it pretty low for now, you can raise it later if needed

[JR2010]

I have read thru this thread and downloaded the worksheets, played with them tried different things but can't seem to grasp the concept.

With that, here is what I have.

2010 Silverado, 5.3, LC9, 6L80E, Mods are dod/vvt delete with TSP cam 212/218 @ .050 (265/271 @ .006) 114 LSA 3 deg adv Low Lift, cat back exhaust, AFE air filter, stock everywhere else.

I have attempted to tune the vve & maf, better yet I have played around with it to see what happens when I make changes. I lowered the entire vve-open table by 10% then the coefficients kicked in, lowered the maf table by 2%, so the fuel trims are a still little rich but not excessive.

Idle was increased by 125 rpm & minimum idle table was adjusted as well. Proportional error increased to 100. Torque follower in 1st & 2nd gear lowered by 2. Throttle opening rate in 1st adjusted up from stock but not maxed out.

Timing all stock for now. I played with the tables with some success but put them back to stock until I get this fueling & air flow issue figured out.

Transmission was reset for the 31.91" wheel using the gear/tire wizard in the editor, other than that all stock settings.

TM is stock as well.

With all that, attached is the worksheet from my scan this morning during my 20 mile commute to work. I had a hard acceleration getting on the highway but the rest is pretty typical for each morning.

EDIT: Any guidance would be appreciated. Thank you.

[ATTACH]
71804[/ATTACH][ATTACH]
71805[/ATTACH][ATTACH]
71806[/ATTACH]

[Area47]

dumb dumb question. When entering the final numbers into HPT. Using the eoit table in the "Table" tab. or the user input data in the "input" tab?

[scottt28]

The idea is to enter values in the yellow columns on the INPUT page. These values are used in formulas on the TABLE tab. Values in the TABLE tab are then used to generate GRAPHS in the last tab.

[Area47]

blonde moment with a deer in the headlights. got it figured out.

[Paz]

I've had a bit more of a fiddle today.

Played around with the Normal ECT this morning and dropped it down from 110 to 85 in the operating temps (with 520 across the board in boundary), did seem to reduce fuel smell and saw a slight improvement in AFR (leaned out some) at idle.

So I've made some adjustments based on the above to my injection timing, currently running the attached, seems good under foot, opinions?

[07GTS]

whats it like up top seems very delayed at 660 in boundary input..?

[Paz]

whats it like up top seems very delayed at 660 in boundary input..?

Did seem reasonable in the log i did this arvo although i only touched on 6200rpm briefly.

My aim this time was to do as the notes mention of keeping EOIT-FRC about 20/30 deg before IV closes for blower motors but, i do remember GHuggins mentioning he only goes to about a max of 620deg for boundary up high in the RPMs which had me wondering?

[07GTS]

yea i remember GHuggins saying that also thats where i was wondering how it felt

[Area47]

I've had a bit more of a fiddle today.

Played around with the Normal ECT this morning and dropped it down from 110 to 85 in the operating temps (with 520 across the board in boundary), did seem to reduce fuel smell and saw a slight improvement in AFR (leaned out some) at idle.

So I've made some adjustments based on the above to my injection timing, currently running the attached, seems good under foot, opinions?

drop your normal ect to 60.
0 - 4096 rpm
535.0 535.0 535.0 550.0 573.0 575.0 585.0 600.0 605.0


you were running out of angle to work with. dropping the ect down gives you more to work with and cleans up the fuel smell at idle.

[GHuggins]

I've had a bit more of a fiddle today.

Played around with the Normal ECT this morning and dropped it down from 110 to 85 in the operating temps (with 520 across the board in boundary), did seem to reduce fuel smell and saw a slight improvement in AFR (leaned out some) at idle.

So I've made some adjustments based on the above to my injection timing, currently running the attached, seems good under foot, opinions?

You probably went past ppv - might want to double check your numbers as it should have actually made your afr go richer... Usually ppv at idle is ideal for any cam, but there are those odd balls

[dankmac]

So I've experimented with delaying injector timing as suggested in this thread, but yesterday for the first time I went the other direction...and my engine really loved it.

I got richer everywhere at part throttle and idle fairly substantially.

The engine is the smoothest it has ever run.

I have run stock, delayed, and now advanced injector timing and advancing the injectors to spray on a closed intake valve everywhere seems to be the hot ticket for me.

[GHuggins]

I like to shift it 30 to 40 degrees each way to see which way they are going to like to be whether it's advanced or retarded... I find that only certain cams and setups like to be advanced... But they are out there - I've even heard or people targeting 360 degrees for eoi at all times - I've never personally had any luck with it being there...