can't get my head around injection timing for cam

[Sierra09]

i cant find that other thread now that say witch way going advances and retards EOIT. if Advancing would be increasing i would go say around 530ish? from 3,072-2,560 should i increase alittle more? or am i wrong and need to decrease alittle? if i understand correctly i am going to leave idle rpm stock 0-1,024=520 and from 1,536-2,560=530ish 3,072-5,632=? 6,144-8,192=590 thanks
this is what i have in my boundry right now
0 512 1,024 1,536 2,048 2,560 3,072 3,584 4,096 4,608 5,120 5,632 6,144 6,656 7,168 7,680 8,192
520 520 520 527.5 530 530 545 550 550 550 550 560 580 590 590 590 590

[07GTS]

increase Boundary = delay eoit
increase rpm = advance eoit
increase ect = advance eoit

[Sierra09]

Another question truck has headers no cats and the raw fuel smell is extrem. Not changing the stock boundry it probably will not help this? Any suggestions for that ?

[GHuggins]

I didn't see your lobe sep angle in the cam card you posted - you'll need to run a different ect table - I'll post one up for you to start with later tonight or tomorrow... What's your injector duty cycle peak at wot? Need to know that one too... Your boundary also looks like your doing steps - you want to have a smooth curve - one that resembles a factory MAF curve only it starts out flat and then flattens out up top...

[GHuggins]

540 at 2500 then smooth until it wont smooth anymore from there to 1000 rpms and from there to the first 590 cell then after that just smooth the first 590 cell down between it's neighboring cells just enough to round the corner off... Use these ect values and see how they work for you... You'll adjust the ect table until your no longer pulling fuel and to where you have great throttle crispness during colder engine temp snaps without lean outs on the wideband...

[Sierra09]

114lsa injector pulse width? i don't believe i have duty cycle unless that is it. pulse width is running 12.5-13ms @WOT
07gts stated that decreasing boundary is advancing so should i be dropping off to 510-515 around the 2000-2500rpm and then slow start retarding the injector timing? or should i stick with 540 and do trial error? i don't have dyno time just street and feel. and i am changing my normal EOIT with those correct?

[mowton]

Not sure if this will help but here is the worksheet we use in our training sessions......

Ed M

[GHuggins]

Should be like this... Adjust the ECT table for throttle response and exhaust smell. This is what I meant by "more" advanced from 2500 down - notice above this it jumps up more steeply...

[GHuggins]

Not sure if this will help but here is the worksheet we use in our training sessions......

Ed M

Ed, If I understood this correctly - which I probably looked at it wrong - is there a reason why your moving the boundary after the intake valve is closed? I'm just looking at where you said you can move it within 20 to 30 degrees of the new closing point and then you have the new max boundary line about that far after the intake valve is closed in the graphic...

[mowton]

Ed, If I understood this correctly - which I probably looked at it wrong - is there a reason why your moving the boundary after the intake valve is closed? I'm just looking at where you said you can move it within 20 to 30 degrees of the new closing point and then you have the new max boundary line about that far after the intake valve is closed in the graphic...

I'll have to relook at it when I get home but if memory serves me right I thought that sample cam had a ivc of 620...

Ed M

[mowton]

IVC 622 and new boundary moved to 600 in the example.....

No where as versed as you at injection timing Greg, but I would say this setup would need larger injectors in order to bring the injection cycle within the current cycle as the -119 degrees with the current stock injectors at 17ms is taking too much time at 6000+ rpm.

Ed M

[Sierra09]

Thanks a lot for the help guys this was a huge difference the fuel smell is way better throttle response is greatly improved and all out pull of the truck 👍

[GHuggins]

Just watch out - number one "complaint" I get is how the vehicles start to break the tires loose at highway speeds during stomps Not saying yours will do this - just saying better to expect and be ready even if it doesn't...

[ants-gts]

Hey Greg between the injection timing and meth could add 3 deg through most of the midrange and 4 deg up top end 😎
Now tracton is a real issue lol