Thanks, Andy, for a great video. I was researching secondary injector timing, and this is the best injector timing information I found so far. How about doing it at WOT, and even add the cooling effect of Methanol on the intake charge vs more fuel at the valve (primary injectors). That would be awesome!
This only really applies to an engine running at low power. At higher power levels when the injector duty cycle exceeds 25 % the injection duration is now longer than the intake duration so injection now occurs outside the ideal injection "window". As power level increases this situation becomes worse. The upshot is that true sequential injection is fine for low to medium power but is largely a wasted complication at high power levels.
The Maxx has an option to set the value based on the center of the injection event. Would that be a better way to control the angle than the start of the pulse?
Would this mean that peak RPM should corelate to peak torque. I'm trying to get a little more torque off idle. Mid length headers have softend the low end over long tubes. On the plus side, no scraping over speed bumps. Great series of videos by the way!
Hey Andy love the video it helped me understand better. Question, why would someone send me a base tune with fuel injection timing set at 550degrees from idle to 3000 rpms . Injectors are about 7inches away from intake valve . Small block Ford.
Do you think the hot intake valve helped atomize the fuel causing it to end up burning less. . Also the higher idle could have also been effects of the correction some motors like a little richer idle. I want to try this test no correction all fixed timing. I Love Finding Sweet spots. There is a lot of theory about when to inject fuel and I've heard both spectrums. Also it would be interesting to see how you would advance injector timing based on rpm to compensate for time delay from injector spray latency.
Great video I’m tuning my B18C stock injector location Pro Series Intake manifold and pro 1 cams I have my afr good and timing maps and On my Hondata s300 injector phase is set at 405 cold and 480 and 450 Hot BTDC. Are you familiar with these settings on Hondata ?
Again a great video :) can you do the same approach at max torque too? Or is there a better way to see where the injection timing wants to be at higher rpm?
Dear Andy, Hello! Please clarify 4:47. EGO cor and PW. As shown EGO cor stands for adding or deducting fuel to meet pre determined AFR. So as i see, PW(pulse width) and EGO cor are really correlating on their waveform but at around 340 degrees, EGO cor moves from lover to upper part of its chart showing fuel adding, while PW still stays below middle threshold. Why is that happening so?
Thanks mr. Andy great video..... Wanna ask a question. Is it the injection timing constant from Idle to high rpm? Or the injection timing is variable from any rpm VS load? Thanks
One question/correction: you state that the injection timing settings are in degrees ATDC but at least in current MS3 code, isn't it *before* TDC on the compression stroke? Of course at the default of 360 it wouldn't matter, but the video makes it sound like larger numbers in the table making injection timing later, and I thought larger numbers equaled earlier timing.
This is also my concern. He says the sweet spot is by putting around 350 degrees in the map (which refers to BTDC in the manual) so 10 degrees atdc in intake strokes. Makes more sense to me.. The timing line image with the strokes would be totally messed up if we're right.
Also very early injections (higher number) gets all the overlap and in the ego correction plot you see it's using more fuel. While later injections (lower numbers) find the intake valve more open and optimizes fuel saving since the vacuum draws vaporized fuel and you're not using all the duty cycle. Now everything makes sense. So I'm pretty sure the table is actually BTDC for the compression event. Andy did a very good work, just the assumption It was atdc misleaded him. This means that those 10 degrees he retarded the injection actually lowers the usable duty cycle if used in the high rpm range, where probabily the engine would benefit more of higher numbers (a little earlier before the intake stroke happens) to give time to the fuel to travel the long runners in this case.
Three years later since I first watched and this is still good information to refer back to. Thank you Andy.
thank you very much Andy, now I know how to adjust a diesel engine's injector timing
Andy. This is a very good study. Super logical and great outcomes. Love it. Rex here in NZ.
Thanks Andy, this is great info!
SUBSCRIBED! I've always had trouble setting the injector timing!!! Thank you!! :D
I am very grateful for what you have done for us
Nice work, Andy.
Thanks, Andy, for a great video. I was researching secondary injector timing, and this is the best injector timing information I found so far. How about doing it at WOT, and even add the cooling effect of Methanol on the intake charge vs more fuel at the valve (primary injectors). That would be awesome!
This only really applies to an engine running at low power. At higher power levels when the injector duty cycle exceeds 25 % the injection duration is now longer than the intake duration so injection now occurs outside the ideal injection "window". As power level increases this situation becomes worse. The upshot is that true sequential injection is fine for low to medium power but is largely a wasted complication at high power levels.
So if you equalized the rpm could the injection duration improve @ 350 injection angle ?
for a small 1 cylinder bike can i use 360 deggress for all the rpm range ?
The Maxx has an option to set the value based on the center of the injection event. Would that be a better way to control the angle than the start of the pulse?
Would this mean that peak RPM should corelate to peak torque. I'm trying to get a little more torque off idle. Mid length headers have softend the low end over long tubes. On the plus side, no scraping over speed bumps.
Great series of videos by the way!
Hey Andy love the video it helped me understand better. Question, why would someone send me a base tune with fuel injection timing set at 550degrees from idle to 3000 rpms . Injectors are about 7inches away from intake valve . Small block Ford.
In semisequential, should the value of the injection angle be divided into 2?
Hi Andy - this is great info. Could you tell us what the cam was on this motor? Specifically the inlet opening timing?
Спасибо! Очень познавательно ! Мне пригодится это!
Do you think the hot intake valve helped atomize the fuel causing it to end up burning less. . Also the higher idle could have also been effects of the correction some motors like a little richer idle. I want to try this test no correction all fixed timing. I Love Finding Sweet spots. There is a lot of theory about when to inject fuel and I've heard both spectrums. Also it would be interesting to see how you would advance injector timing based on rpm to compensate for time delay from injector spray latency.
Great video I’m tuning my B18C stock injector location Pro Series Intake manifold and pro 1 cams I have my afr good and timing maps and On my Hondata s300 injector phase is set at 405 cold and 480 and 450 Hot BTDC. Are you familiar with these settings on Hondata ?
Awesome info , thank you very much sir :)
Again a great video :) can you do the same approach at max torque too? Or is there a better way to see where the injection timing wants to be at higher rpm?
That would have to be tested with RPM per sec or with a dyno.
good stuf andy !
Dear Andy, Hello! Please clarify 4:47. EGO cor and PW. As shown EGO cor stands for adding or deducting fuel to meet pre determined AFR. So as i see, PW(pulse width) and EGO cor are really correlating on their waveform but at around 340 degrees, EGO cor moves from lover to upper part of its chart showing fuel adding, while PW still stays below middle threshold. Why is that happening so?
Thanks mr. Andy great video..... Wanna ask a question. Is it the injection timing constant from Idle to high rpm? Or the injection timing is variable from any rpm VS load? Thanks
The settings would change thru the power band. Most sensitive at low power and less sensitive at full power.
Andy Whittle thanks for reply......learned alot from your video.... Thanks
One question/correction: you state that the injection timing settings are in degrees ATDC but at least in current MS3 code, isn't it *before* TDC on the compression stroke?
Of course at the default of 360 it wouldn't matter, but the video makes it sound like larger numbers in the table making injection timing later, and I thought larger numbers equaled earlier timing.
This is also my concern. He says the sweet spot is by putting around 350 degrees in the map (which refers to BTDC in the manual) so 10 degrees atdc in intake strokes. Makes more sense to me.. The timing line image with the strokes would be totally messed up if we're right.
Also very early injections (higher number) gets all the overlap and in the ego correction plot you see it's using more fuel. While later injections (lower numbers) find the intake valve more open and optimizes fuel saving since the vacuum draws vaporized fuel and you're not using all the duty cycle. Now everything makes sense. So I'm pretty sure the table is actually BTDC for the compression event. Andy did a very good work, just the assumption It was atdc misleaded him. This means that those 10 degrees he retarded the injection actually lowers the usable duty cycle if used in the high rpm range, where probabily the engine would benefit more of higher numbers (a little earlier before the intake stroke happens) to give time to the fuel to travel the long runners in this case.
What timing form are you talking about for the fuel injection? MS(milliseconds)? Are these dead times?
it tells at what point will the injectors start to be opened
So strong vacuum is a good sign of power then?
Strong vacuum is just a sign of a mild cam on the low power side of the Vtec.
But I want to know more about injector pump
Poor sound and display quality but a deep drive for sure.
Ummm... I'm presuming this isn't for batch fired injection? 😕
If you can afford pilot injection you can afford a microphone