Injector End Angle Tuning

[xr4x4ti]

Wow, both sheets are pretty cool. If you play around with injector size and fuel pressure in the Holley calculator with the base fuel map zeroed, injector size makes a much much bigger difference than fuel pressure.

This makes sense because it tries to center the pulse on the ICL. A different injector will change the pulse width and therefore require the IEA to change to keep it centered. Tim XR4X4Ti

[allan5oh]

But if you zero out the fuel map, the PW is zero.

[allan5oh]

Anyway, there is no magic as to why I picked duration at .050 besides that is why allen5oh suggested. The spreadsheet works either way.
I put the table from the spreadsheet in my tune tonight and went for a pretty short test cruise and I think the gas smell is greatly reduced. Didn't get any other impressions. Tim XR4X4Ti

Did you use similar numbers to the ones I sent you?

[allan5oh]

Another thought: If using .050" events and a bit of offset vs advertised events plus accounting for port velocity.

Won't the numbers around the idle and off idle area pretty much be the same? But they would diverge further from idle area.
Also, if you dyno tune push the numbers around in the high load area. The slope should be correct, but I have a feeling many with smaller injectors get numbers that are too negative using the S2H method.

[xr4x4ti]

Did you use similar numbers to the ones I sent you?

I never got an email back from you? I did send you a file, but figured you were busy. I used the values from my own spreadsheet that I posted. I would love to compare what you would generate vs my numbers.

[allan5oh]

I never got an email back from you? I did send you a file, but figured you were busy. I used the values from my own spreadsheet that I posted.

I definitely sent you one, will resend right now. Let me know how it goes and how the numbers compare.

[Badassbird]

Is there a link to one of your spreadsheets that I'm missing?

[UARPerformance]

Same as he said. Where are the spreadsheets you guys are speaking of?

[81 TransAm]

Try these, they were taken from other threads.

[Paul P]

Below is a link to a simple page that you can put your basic cam profile in and get a graph. Useful for understanding the Auto Phasing function of the HP EFI software IEA function. https://mgispeedware.com/camshaft-calculator/. My camshaft entered onto the site.


This is the graph after entering in the cam information in the HP EFI V5 IEA page and hitting the Recalculate button. Interesting if you have these two things you can make sense of this quite easily. System will be injecting fuel just before the Intake opens at idle, and slowing moving it further towards the Intake open cycle as RPM increases.

[lazaris]

Nice information. Did you notice any idle, tip-in or part throttle improvements using the calculated table?

[Paul P]

Nice information. Did you notice any idle, tip-in or part throttle improvements using the calculated table?

I can't wait to try it. Unfortunately, I still have a lot of snow on the ground up here in North Central Massachusetts. As soon as I have clean unsalted roads, I'm going to give it a try. One thing I hope it fixes is the little bit of a surge around 2000 RPM. With this big of a cam, it's a small problem when cruising around 35-40 MPH.

[lazaris]

I sent you a PM.

[allan5oh]

I can't wait to try it. Unfortunately, I still have a lot of snow on the ground up here in North Central Massachusetts. As soon as I have clean unsalted roads, I'm going to give it a try. One thing I hope it fixes is the little bit of a surge around 2000 RPM. With this big of a cam, it's a small problem when cruising around 35-40 MPH.

I have a feeling my IPW based IEA maps would work better for you. Have I done maps for you?

[Paul P]

I have a feeling my IPW based IEA maps would work better for you. Have I done maps for you?

Hi Allan. No you haven't. I do want to see what happens with this change first when the weather clears. If I play with when the fuel is injected + or - in degrees on the table it is effectively adjusting the Injector Pulse Width. That being said what would be the difference in your IPW based IEA maps? I don't see your point here? Can you please clarify?

Checked around the forum here and saw your "Let me help you with Injector End Angle" post. I'll be using the V5 to start with and tuning it from there. I know there are false lean conditions from my previous experience with another system. The car liked to idle around 16.7:1. I ignored the WBO2 and gave the engine what it wanted then looked at the WBO2 and was surprised to see the false output.