The ECU does read values beyond 1600 Hz, but the MAF scaling, meaning how many L/Hz, is the same for all Hz readings 1600Hz and above.


Eric

 

I did some logs tonight at idle and noticed my STFT were 0, MTFT were -2 and LTFT were -3 with the Airflow Hz at 31.45. Given what I've read into the need to MAF scale I'd assume I am fine.

FYI - I am running the infamous K&N Typhoon intake and with no problems, ever in 2 years.

I should mention though that 100% STFT and MTFT are 100% with the LTFT at 74.21875? If I apply the same principal as is suggested for determining how far "off" I am it would appear I am off about 25%?

Any thoughts would be appreciated.

 

Scaling for the MAF is a little tricky, but your trims are real close to optimal, as even stock cars hover around there..

I don't know where you got your conversion for trims, but on an OBD-II scanner, and Mitsulogger, anything under +/-10 is going to be close enough that you don't have to worry about it for closed loop fueling..

Now when you do your open loop tuning (in the maps) the AFR's you see in your maps, and the actual AFR's you get, should be close.. However your maps may need fine tuning as that is where the values start to diverge. What I mean is (especially with the Typhoon) is as boost pressure increases, the MAF output may not be proportional to the factory scaling, in that case, you would find your load to be in cells higher or lower than expected, and you'll have to tune those cells accordingly.

 

Just an FYI for folks wondering why they ended up with a row of 1's in the left column after trying this: 96940011 (at least) is big-endian.

The instructions should probably be corrected to note that you should use whatever endian value the previous MAF scaling y-axis scaling had (ie. whatever uint16 is).

 

i dont understand. the airflow Hz that i logged with evoscan does not match up to the chart made by l2r99gst

 

airflow Hz in evoscan is 6.29*x

 

When I do the following with the latest version of ecuflash, and I pull my maf scaling table back up, i get a table that looks like nothing like the example (rom 92640008) on the y axis is starts with 4800, then 0,0,0,1 ... What the heck could cause this being as I have copied the instructions verbatem? I understand how maf scaling works I have done this with HP tuners on gms for years, I am just trying to solve this evo issue with a customer and this software is not working with me. Any help is appreciated.

 

^^ Go into your AirflowinHZ scaling hit edit change it from Little endian like the instructions say to Big endian.

 

anyone with knowledge on this?

 

For the 88840016 ROMID (EDM EVO IX), it should be BIG ENDIAN, not little. It took me about half an hour to figure out why my Hz scale was coming out rubbish.

Btw: i still didn't scale yet, but from what i understand, i should change the value for each cell of the right column.
Is it ok do to a bunch of pulls, and get the values of the trims for every Airflow Hz value, or do you have to stay at a given RPM/Airflow for some time for the trims to settle (just like when you scale your injectors).

 

I should have just tried that, i tried evrything else thank you.

 

Assuming this is the steps I need to take. I am having a problem hitting over boost. As the temps have dropped it has gotten worse. I was getting it in fourth now that we are in 30's temps I get it in third.

I was to understand the cold air intake is allowing my M/A to read beyond its threshold and making the car think it was injesting to much air/boost.

Anyone want to confirm that this is the adjustments I need to make.

Thanks,
Jeff

 

What loads are you hitting and what do you have in the Boost Limit table?

 

looks like i'm still waiting for an answer. i can't find it anywhere else.

 

Has anyone done this on the 96940011 ROM (2005 EvoVIII)? Does it work? Anyone been successful? Would like to find out how this has worked.

Josh