Injector End Angle Tuning

[allan5oh]

More than willing to help. The more data I have, the more refined my spreadsheets will become.
EDIT: This guy seems happy, and an unexpected positive shows up:
https://forums.holley.com/showthread...024#post105024

I love this car now after this IEA change!
This is way over my head! Lol! But will try to comprehend the change at least.
Hoping to make the changes mentioned in the earlier post and get to the track late next week to Bring the car up to speed and will report back!
#Greatfull
UPDATE: The car use to run 200°+ on a short cruise on a cool afternoon. We thought there was a cooling system issue.
After this IEA change the car will not go over 187° on a 90°F+ summer day in traffic!
And at 60 MPH the temps continually drop!

Mind you he went from an IEA of 0° to my maps, so this is an extreme example. Have a look at his datalogs.

[xr4x4ti]

Allan5oh, I love what you are doing here and I'm going to give it a try. But I don't understand why you broke it up into two Advance Tables. You mentioned resolution, but the equations in your spreadsheet (which I understand) are linear. It shouldn't really matter how many cells you have as long as the Holley linearly interpolates between the cells. Thoughts? Tim

[allan5oh]

If you look at the high table the Y axis is double that of the first table. If you smashed the two tables into one it just doesn't look as good.
If you want just one table I can do that. It's actually much faster, but where the two slopes meet will not be as good.
Also, I do have plans in the future for non-linearity. But let's just collect data first.

[xr4x4ti]

Are you using valve events (EVC) specced using advertised duration or duration at .050" in lift?

[allan5oh]

I use .050" duration then retard things a bit more. Advertised isn't always available and usually most have the cam phasing calculator filled in for numbers at .050" lift. Then I tell the person of they still have fuel smell add a bit in the idle area columns.

[TBART1970]

Then I tell the person of they still have fuel smell, add a bit in the idle area columns.

Add as in more negative?

[allan5oh]

Add as in more negative?

No, straight addition. Closer to zero, so less negative. Just adding 10° or 15° can make a huge difference. Try it either way. Watch what Closed Loop does, OR turn it off then watch AFR.

[Robs455]

Here's an Excel table, you can put your cam (.050”) numbers in and the calculator do the rest for you. Just keep in mind your last possible injection point must be enter manually.

Explanations:
Intake air velocity is difficult to determine. I have the values from the Engine Analyzer program. But somehow, values seem too low, so I made a button to adjust the speed.

*One bug is still there. When you change the injector to valve distance, you must manually activate & deactivate the button “Ignore port flow duration” to refresh the values.*

Real overlap. The intake valve goes open, but until the air is traveled to the exhaust valve the mixture that can’t be lost through the exhaust valve.
Real overlap starts at this point, where the mixture has reach the exhaust valve and will leave the cylinder until the exhaust is fully closed.

[allan5oh]

Holy smokes did you make that? I'm going to have to take a look at that closer.
What I eventually want to incorporate is a well tuned VE map (conversion clicked). VE should be a proxy for port speed.

EDIT: I want to add even with the fuel table zeroed out, the Holley calculator will change its output for injector size and fuel pressure. A lot more with a change in injector size.

[xr4x4ti]

Well, I made my own spreadsheet too. It doesn't look quite as nice. But it takes into account EVC and then automatically transitions to ensure all of the fuel gets to the valve before IVC.

To estimate time of flight for the fuel, I took into account fuel pressure and distance of injector from valve. I'm not sure this is valid, but I thought it was worth looking into. Port velocity might dominate the fuel time of flight VS the speed the fuel is being sprayed at. Take a look. Tim

[81 TransAm]

Why are you using @ .050" duration? You should be using advertised duration. If I plug my advertised duration numbers in, it calculates my valve closing & opening events properly and I get the same IEA numbers I'm currently using. The distance from valve setting only affects part of the table. With so many different port designs it would be impossible to calculate port speed for every different head out there. I think it would be up to the tuner to offset the table to accommodate the heads he has.

[allan5oh]

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.

[allan5oh]

Why are you using @ .050 duration"? You should be using advertised duration. If I plug my advertised duration numbers in, it calculates my valve closing & opening events properly and I get the same IEA numbers I'm currently using. The distance from valve setting only affects part of the table. With so many different port designs it would be impossible to calculate port speed for every different head out there. I think it would be up to the tuner to offset the table to accommodate the heads he has.

It actually seems to work. I usually just do a bit of an offset. Have you had better luck using advertised?

[81 TransAm]

I used advertised duration. If all you know is advertised duration, ICL & LS, xr4x4ti's calculator will give you the same table as the one you created using EVC point. I didn't offset my table. I have small runner (190cc) street heads that have a high port velocity.

[xr4x4ti]

Why are you using @ .050 duration" You should be using advertised duration. If I plug my advertised duration numbers in, It calculates my valve closing and opening events properly and I get the same IEA numbers I'm currently using. The distance from valve setting only affects part of the table. With so many different port designs it would be impossible to calculate port speed for every different head out there. I think it would be up to the tuner to offset the table to accommodate the heads he has.

There's 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