MAF calibration spreadsheet, new and improved

[redhardsupra]

I put together a small writeup and a spreadsheet that hopefully will give people no reason to multiply their MAF numbers, but to actually calibrate it.
It's really simple, plug in your numbers, and you get a calibration, i even formatted it so it's easy to copy it back to HPT
Let me know how you like it.

http://allmod.net/hpt/

Marcin

[Dirk_Diggler]

404

[redhardsupra]

works fine for me, tried it from few different locations/browsers/OS's.

[Dirk_Diggler]

now it work before it didnt

[03Quadrado]

Nope. I keep gettin a 404. ???

[redhardsupra]

I don't know what's going on, I'm going to email my webhosting place. in case www.allmod.net/hpt doesn't work, try just allmod.net/hpt that's all i can think of right now. sorry guys, but i really cannot reproduce your problems

[SideStep]

I put together a small writeup and a spreadsheet that hopefully will give people no reason to multiply their MAF numbers, but to actually calibrate it.
It's really simple, plug in your numbers, and you get a calibration, i even formatted it so it's easy to copy it back to HPT
Let me know how you like it.

http://www.allmod.net/hpt/ or http://allmod.net/hpt/

Marcin

THANKS!!! for the time you put into this... I was doing SD over the weekend to get my VE table close, went through a tank and a half of gas. I will give your spreadsheet a shot this week... I have a very long road trip (350 miles).

How do you recommend going into SD mode? Some where here on the forum there is a write-up explaining to just set the Engine, Engine Diagnostics, General, MAF Sensor Fail Frequency to "0" and this would fail the car over to SD and use the VE table... Sound right???

[redhardsupra]

set the fail freq to 0, and the 3 diag codes everyone else mentions (101,102,103). that's all i do, seems to work right.

[MNR-0]

Just set fail frequency to 0. Don't need to do anythign else for temporary VE tuning.

[SideStep]

Just set fail frequency to 0. Don't need to do anythign else for temporary VE tuning.

Thanks... I was wondering.....

[SideStep]

Another question....

from your spread-sheet...


[glow=red,2,300]"1. log for Dynamic Airflow and MAFHz"[/glow]

Do you mean log the "Dynamic Airflow" (lb/min,g/sec) PID???

OR the

"Dynamic Cylinder Air" (g/cyl) PID???


??? ??? ???

Thanks

[redhardsupra]

Do you mean log the "Dynamic Airflow" (lb/min,g/sec)?

Yes.

[WS6snake-eater]

Another question....

from your spread-sheet...


[glow=red,2,300]"1. log for Dynamic Airflow and MAFHz"[/glow]

Do you mean log the "Dynamic Airflow" (lb/min,g/sec) PID???

OR the

"Dynamic Cylinder Air" (g/cyl) PID???


??? ??? ???

Thanks

hahaha...I was a dumbass on this one and tried to adjust last night, and was logging g/cyl.... back to square one on this one. LOL

[SideStep]

I have tried this twice now....

The second time I used a large 47,000 cell log, now my car will all most not idle and has died several times....

Until I can research it a little more I am going back to my factory MAF calibration

:'(

[redhardsupra]

Please send me the log and the spreadsheet with your data in it, I will take a look at it.

[redhardsupra]

Quick question for the spreadsheet users:
Few people I've talked to expressed interest in adding an ability to filter the gathered data, to prevent obvieously bad values of messing with the results. If you just chart the raw XY points, you'll see the main range of values, and a bunch of 'outliers.' I want a nice method for spotting such values. I know you can probably do it with standard deviation and such, but I slept through most of statistics in college, so I'm seriously rusty. Anyone has any idea how to do it proper? I figured it out with some excel tricks, but if i'm gonna publish it, I'd like it done nicely, with solid math behind it.

[JimMueller]

I have tried this twice now....

The second time I used a large 47,000 cell log, now my car will all most not idle and has died several times....

Until I can research it a little more I am going back to my factory MAF calibration

:'(

Same here. Mine will surge real bad from ~600RPM to about 1200RPM. Sometimes it will practically idle at 500RPM briefly before coming back up. My table has plenty of data at the low end, but it's not a smooth line... sort of a n S-curve if placed on it's side.

I'm going to play with that polynomial again.

[redhardsupra]

Did you do idle tuning after the new MAF calibration? What rpm are you trying to idle at? I have a dinky cam, but I set it at 800rpm and it's perfect, cold, hot, ac, whatever you throw at it.
For the low values don't even bother with equations, just look at the values and fill it out yourself.

[DooSPX]

im sorry, but I still cant open the link.

can you send it to me via email.

[email protected]

[JimMueller]

Did you do idle tuning after the new MAF calibration? What rpm are you trying to idle at? I have a dinky cam, but I set it at 800rpm and it's perfect, cold, hot, ac, whatever you throw at it.
For the low values don't even bother with equations, just look at the values and fill it out yourself.

No, I didn't perform an idle re-learn. But another effect I now have is hesitation off idle. I'm trying to idle at 900RPM, which was working great with the stock MAF curve.