Injector Phasing Information

[twoqik4u2]

Just so you know when boost comp'd the injector adds the extra fuel at the end of the original injector time.  Therfore, you need to advance the injection as load goes up for that rpm band at a lower load.  Hasta la vista!

[BrendanSmall]

Quickie question...

I find that I get better throttle response with the table set to 357 in every cell.  I'm running a 1300 box on a VW DOHC 2.0L motor, so there is not much support for my app .  Are there any problems with maxing out the table like that?  I'd love to set up the table properly, but since my exhaust valve closes at 4*ATDC (triple checked, degree wheel, engineers, etc), it's a bit tougher to set it all up.  I find that 357 works great, any issues with an entire table set like that?

[mx5]

357 in the table doesn't mean anything by itself - so noone can tell you if it is good or not. It is a degree offset modifier based on where you have set your injectors teeth and the phasing, etc. 


Better read this thread from the start   Learning how to set the table (calculating the time when the injector opens) is easy

Quickie question...

I find that I get better throttle response with the table set to 357 in every cell.  I'm running a 1300 box on a VW DOHC 2.0L motor, so there is not much support for my app .  Are there any problems with maxing out the table like that?  I'd love to set up the table properly, but since my exhaust valve closes at 4*ATDC (triple checked, degree wheel, engineers, etc), it's a bit tougher to set it all up.  I find that 357 works great, any issues with an entire table set like that?

[mld54]

ok let me see if I understand
on a 5.0 mustang I think that the cam sync edge is the rising edge and is at 10 degrees before tdc compression.
so would the injector open at the falling edge of the same signal or the rising edge of the next tooth ? (if things are set as Scott has listed in the first post of this thread)

[BrendanSmall]

357 in the table doesn't mean anything by itself - so noone can tell you if it is good or not. It is a degree offset modifier based on where you have set your injectors teeth and the phasing, etc. 


Better read this thread from the start   Learning how to set the table (calculating the time when the injector opens) is easy

Trust me, I've printed this thread out and read it every chance I get, lol.  My only issue was that I didn't understand how it all worked until I actually took my valve cover off, and the cam sensor cover too, and watched what happened when I cranked the motor over by hand.  After doing that, I get it .  I'm not much of a 'comprehender' unless I can apply it at the same time, I learn with my hands I guess.

Now I'm going to reset the phasing so that I can get the table back to 0, and have the injector open at the exact point the exhaust valve closes, so I have more room to play.  I do find the car runs really well right now though....

[LostBoy]

So I need some help...

OK TDC @ 1 is 1.53 (45,9 degree) tooth after sync... Injection is 6,53 (570 degree) tooth before TDC.

EVC is @ (609 degree) so at very high RPM I want to start injection at this point so I am putting to the map value like -321 ?

[IceY2K1]

LostBoy

No help here, but do you happen to have a Timing Event chart or know the IVO/IVC/EVO/EVC for stock cams(1994)?

So I need some help...

OK TDC @ 1 is 1.53 (45,9 degree) tooth after sync... Injection is 6,53 (570 degree) tooth before TDC.

EVC is @ (609 degree) so at very high RPM I want to start injection at this point so I am putting to the map value like -321 ?

[IceY2K1]

Nevermind...a Supraforums member pointed me in the right direction.

Stock cam info:
IVO 3* BTDC
IVC 50* ABDC
EVO 52* BBDC
EVC 4* ATDC

Supra has a 24-tooth crank and 1-tooth cam.

AEM base cal settings:
Injector Phase 0.00 teeth
Inject Tooth #01 19.00 teeth
Inject Tooth #02 11.00 teeth
Inject Tooth #03 3.00 teeth
Inject Tooth #04 15.00 teeth
Inject Tooth #05 23.00 teeth
Inject Tooth #06 7.00 teeth

So, I see the Inject Tooth to 1-5-3-6-2-4 Firing Order relation, however I need to figure out the Inject Tooth, Ideal Inject, and Inject Stop locations per FWombats' Injector Timing spreadsheet.

[SLYB28]

Thanks Guys have a better understanding of injector phasing.
Shu the link (http://forum.aempower.com/bbs/veiwtopic.php?t=8985&highlight=)
is not working and i would love to get the spreadsheet
thanks again SLYB28

[evomotorsport]

Why AEM guys don´t do what many other ecu manufacters do in ther systems and all the tables for injection advance and retard are refered to the END of the injection cycle?

[LostBoy]

For 2JZ

In AEM we are using -360 to +357 and basically it covers one full engine turn so from what I know with inj phasing 0 with Value -360 in the map inj@1 will occur at 570 degrees with value 0  it will occur at 210 degrees (570+360)-720. and my confusion is because at the top of the map High Injection Duty Cycle, injection should start after IVC 609 degrees value for aem map (-275,1) ... so during idle we starting inject after EVC 381 degrees value for aem map (216,9).

Here is excel with what I did for 2jz with 272 int/ext

http://racingteam.kessler.com.pl/other/SupraTT_LostBoy.xls

[Kjewer1]

Quick clarification here.

Is it reasonable to assume that the relationship between displayed parameters "Ign #x Firing Location" and "Fuel Inj #x Open" for a given cylinder is equal to the injector advance? For example, on a 4 tooth cycle, if the ignition event for a particular cylinder is at 1 tooth and the injector open for that cylinder is at 1 tooth, they happen at the same time? I'm refering to the parameters displayed when the motor is running, not what is entered in the options boxes. 

What I'm driving at is the fact that I don't care WTF injector tooth, injector phase, or injector advance are or how they are arrived at if I can simply monitor the end result with these parameters. I now know what Ign # refers to what cylinder (injector 1-4 line up with cyl 1-4), so I can simply watch the parameters and adjust Injector Phase until the seperation between these two events for each cylinder is what I want with timing advance set to zero and injector advance set to zero. What I would like to do is get the injectors, with 0 advance in the table, to be opening at TDC of the exhaust/intake stroke. Then build the advance table from that reference point.

Thanks in advance.

[Kjewer1]

I was able to get an answer to my aboved posted question here.

Apparently you can go by the parameters, they are on the same scale. So for what I'm trying to do, if each Ign # and corresponding Inj # are 2 teeth apart (4 tooth cycle) with ignition and injector advance set to zero, TDC of the intake/exhaust stroke is now my inject event reference point. This makes life easier for ****s like me. 

[shaundrake]

I found this link to be extremely useful in how to tune the injector phasing at home instead of calculating it or using a dyno (both of which are beyond me at the moment).

http://forum.aempower.com/forum/index.php/topic,17177.0.html

[nutzsrt4]

if my cam duration has increased should my injector phase reflect this earlier opening ??



sorry for the stupid post I am just trying to comfirm before I make changes to my map