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How to log airflow in lb/min?

Car-specific questions and tuning advice for the Lancer Evolutions. EVO 8 and 9 mostly, but earlier models welcome.

How to log airflow in lb/min?

Postby honki24 » Mon Oct 06, 2008 10:59 am

Hey guys how (using custom logging) would you formulate logging airflow in lb/min?

1. How do I calculate "load" from my 2 byte load? Whats the equation w/ them that you get load out of? Also how do you call out those bytes? Tom?
2. I've read it can be approximated this way:

Load= (roughly) hz/rpm*852

g/rev= load/95

lbs min= g/rev*rpm/454

(copy/paste)

Which means lb/min ~ Hz/50.622 ??

Surely there is a better way, yes?
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Re: How to log airflow in lb/min?

Postby honki24 » Wed Oct 08, 2008 8:00 am

lol, thanks for the 12 views and no answers. Did some logging last night and that seems to be pretty accurate for me. I'm seeing a peak of ~36lb/min which sounds right for my 16G. That formula is pretty darn close even as simple as it is.
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Re: How to log airflow in lb/min?

Postby tlcoll1 » Wed Oct 08, 2008 10:03 pm

In the software, load is:

(256*LoadByte0 + LoadByte1) * 10 / 32

Can't help with the others.

Tom
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Re: How to log airflow in lb/min?

Postby honki24 » Thu Oct 09, 2008 8:07 am

Very cool. I'll compare the 2.

Uhhh... wait I see "Load" on the list of parameters I can put in an equation... Is this the calculated load already?
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Re: How to log airflow in lb/min?

Postby tlcoll1 » Mon Oct 13, 2008 12:52 pm

That's the ECU+ "load" value. You need to calculate it in the formula from the raw MUT-II values using the formula I just gave you.

Tom
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Re: How to log airflow in lb/min?

Postby honki24 » Wed Oct 15, 2008 9:17 am

yep, it didn't work. I can use the term "LoadByte0" and "LoadByte1" ?
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Re: How to log airflow in lb/min?

Postby tlcoll1 » Sun Oct 19, 2008 10:20 pm

What you need is to set up the software so that it logs "EVO 2 Byte Load 0" in one of the custom MUT-II values, and "EVO 2 Byte Load 1" in another one. Let's say that's "Logged value 2" and "Logged value 3" respectively on the MUT-II Logging pane of Settings->ECU+ Head unit. Next, go into Settings->ECU+ Win, and define a formula like this:

(256*MUT2 + MUT3) * 10 / 32

If this doesn't work, just make a simple formula containing "MUT2" or "MUT3" and debug from there.

Tom
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Re: How to log airflow in lb/min?

Postby honki24 » Wed Oct 22, 2008 11:17 am

aaaaahhh.. "MUT2" = second MUT value logged. Perhaps some labeling would help make that more intuitive. I had no idea where that term came from. Cool. Thanks. lol, the car's just sat there for the past 2 weeks. race it and park it.
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Re: How to log airflow in lb/min?

Postby tlcoll1 » Sun Oct 26, 2008 10:02 pm

Yea, it'll be described fully in the manual. For now, there's no documentation.

Tom
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