Think we could get a quick how to on using IDA for this?

 

It's amaizing how accurate this "AIRFLOW/RPM*852" is,

Thanks

 

I'd agree that it's pretty accurate *until* your reported airflow maxes out at 1603.95. Are you still using that formula once your reported airflow actually goes above 1603.95, but is still only be reported (clipped) at 1603.95? How are you getting around that limitation? Perhaps you're using some other logger than Evoscan that get's around that obd2 reporting limitation. What logger are you using?

If I'm just not getting this, you guys can feel free to make fun of my stupidity. I've been resorting to interpolating timing-rpm (providing I'm not getting knock) to located load cells for now.

So once again... Am I just wrong about the problems under high-load using that formula? Please advise.

 

Does the ECU roughly do the same calculation deciding what load it's at? Is the 1604hz an EvoScan thing or a MAF thing?

If so then the ECU will do the same math and also have a 1604hz cap

 

the ECU correctly handles values over 1609hz, only the MUT output is clipped at that value. I was told all mitsubishi ECUs did that (Older turbo DSMs)

Not sure if we'll ever find if the MUT/OBD protocol has two locations for the entire value..

I am using a piggyback/logger to overcome this stuff so its really not a problem for me.. but I did log a friends car with only Evoscan and I can see how frustrating it is.

 

I have yet to have my airflow max out above 1566, but my car is not heavilyu modded. The formula works very well for me.

 

MalibuJack, that is my understanding as well, and I belive you're using ECU+ which get's around that whereas Evosscan does not (yet).

Nj1266, wow, I'm suprised you're not going over 1566. My Evo IX went over 1603 even stock with nothing but a boost controller peaking at 20.* psi.

 

The 9 has a bigger cold side on the turbo. Maybe that is the cause for the higher airflow on the 9 than on the 8.

 

Logs of stock UK IX FQ320 (JDM with a cat back exhaust and intercooler pipes) show about 1500 Hz at standard boost. With similar setup but catless with boost controller they seem to do about 1600 Hz at 5200 RPM or so depending on the boost level you use and the gear. These are on standard induction.

 

Not only that, but air density will affect it too, other mods that affect the intake tract too.. So altitude and temp will alter the value, hence the reason the we need baro and air temp sensors to put the values back in check.

 

so there's no easier way to determine load cells while tuning than the timing block method? there has to be an easier way! i wonder if my pocketlogger goes over 1604 Hz? probrably not since it's through the same port the tactrix cable uses, huh?

 

I'm gonna say this in a nice way. Airflow is not to be ****ing confused with load. Load is a value that the ecu uses for a lookup on your maps. It is in grams/rev. Airflow is a Hz value that your karmon vortex MAF spits out. The reason the value stops at 1603 is due to a math limitation in the data line to/from the ecu. Also your load value will be strongly affected by air temp and barometric pressure.

 

You guys REALLY need to quit looking at MAF Hz values. It is meaningless. Your using the biggest part of a three part formula. Your going to get a lot further faster if you just unclick the MAF Hz in your logger.

If you want to see if your moving more lbs/min of air watch your injector pulsewidth (without changing your fuel tables). If your have more IPW your moving more air.

We need to know the grams/rev value in the ecu. It needs to be found. This is THE most important part of working with the stock ECU. Knowing this value is about all I need to know to tune my DSM. I'll be picking up an EVO 9 this weekend so hopefully that will speed my process of helping out.

In the meantime, what I used to do in my DSM before we found the grams/rev value is the timing lookup that you guys hate. For now, I'm sticking with my 1 deg timing retard per 3 counts of knock value. That is ***-U-ME ing an octane value of 255.

That brings me to another point. I'm gonna want to write come code to do some usefull things like reset the octane value every time you start the car. Anybody have the opcodes for the SH2 processor that the evo uses?

 

I had to go and edit my post because I did not realise I has such a serious typo above. I meant to say it clips airflow at 1603.95, NOT LOAD. OOOPS!!! Bad, very bad!

I do fully understand the differnce as you can tell by my other posts (that remain without such a typo, without being edited).

DanI, I've been dealing with DSM every bit as long as you, but am still capable of a typo here and there.

 

What stinks is my W/M controller not only uses boost but also uses that frequency to route VDC to my pump. At 1602 my pump will only run 90% max no matter what the boost.

Is it my imagination or does anyone else notice Ecu becomes a little picky in areas where load changes fast per rpm unless timing values aren't flat (redundant adjcent values)?