MAF flow rate help

[02bigstrokin]

i have had no luck with this table in my trucks tunes. does anyone have a good working maf rate table they might would share for a 6 inch intake? i have messed with it and messed with it and i cant figure it out. i go one way with it, i have no pedal starting off, doesnt fuel at all. i go the other way with it pedal is better but throws the transmission code ive been fighting for so long. ive tryed adding percentages to the ones that dont throw the code but have no pedal and i cant get it right. any help is greatly appreciated.

 

[sweetdiesel]

my table is stock besides wot area

I only use 5 intake though

 

[sweetdiesel]

Josh I could help u use efi to calibrate your intake if you want?

 

[jpowel29]

I have been wondering the same thing about my 6" intake tube. Mine is not yet running so I can't comment on how it is going to work with the stock MAF settings. I will keep an eye on this thread for updates and will gladly share my feedback once mine is under its own power soon.

 

[TrentNell]

Josh , I can get you the MAF table i use in my truck, not sure if it will fix your issue but i have never had a problem with it .

 

[02bigstrokin]

i tryed the maf table from the other tune trent and it drives pretty good but throws the code.

it seems to only be on my comp tunes that do all this mess. the street tunes dont have any problems.

 

[jpowel29]

Been data logging MAF pids along with fuel while staging and launching (I have a 6" diameter intake).

At 25% throttle position (2094rpm, 45mm of calc fuel flow, around 130mpa of rp, 1250us pulse, holding the brakes hard while staging) MAF voltage is 1.8v and lbs/min shows around 13.

At 100% throttle position (2400rpm and rising) calc fuel flow drops to 32.8mm, rail pressure drops 123mpa, MAF voltage is now 1.0 and lbs/min bottoms out at 6.3.

I have not re-scaled the stock LBZ MAF table yet. Anyone have a good method to help dial this back in?

 

[JoshH]

Been data logging MAF pids along with fuel while staging and launching (I have a 6" diameter intake).

At 25% throttle position (2094rpm, 45mm of calc fuel flow, around 130mpa of rp, 1250us pulse, holding the brakes hard while staging) MAF voltage is 1.8v and lbs/min shows around 13.

At 100% throttle position (2400rpm and rising) calc fuel flow drops to 32.8mm, rail pressure drops 123mpa, MAF voltage is now 1.0 and lbs/min bottoms out at 6.3.

I have not re-scaled the stock LBZ MAF table yet. Anyone have a good method to help dial this back in?

You can always modify the Main Injection Mixture Limit table (B0795). Make the numbers smaller for more fuel and larger for less.

 

[JOHNBOY]

Been data logging MAF pids along with fuel while staging and launching (I have a 6" diameter intake).

At 25% throttle position (2094rpm, 45mm of calc fuel flow, around 130mpa of rp, 1250us pulse, holding the brakes hard while staging) MAF voltage is 1.8v and lbs/min shows around 13.

At 100% throttle position (2400rpm and rising) calc fuel flow drops to 32.8mm, rail pressure drops 123mpa, MAF voltage is now 1.0 and lbs/min bottoms out at 6.3.

I have not re-scaled the stock LBZ MAF table yet. Anyone have a good method to help dial this back in?

Here is what I do.

You need a stock air inlet tube with the MAF mount in it.

Use a silicone reducer or duct tape to seal it to the end of your intake tube.

Now log you need to log the MAF voltage.

Use the DVT tool to raise 100 rpm at time.
Then log MAF flow and voltage.

Write down the RPM, voltage, and grams per second for each RPM.

Example My stock 07

700 RPM 35.2G/s .8v
800 RPM 37.0G/s .8v
900 RPM 47.8G/s 1.1v
1000 RPM 59.0G/s 1.3v
1100 RPM 65.2G/s 1.4v

and so on

Remove the stock MAF mount and then mount the MAF back in your intake.

Repeat the same test.

The actual flow should change very little. But do to the larger inlet Diameter it will read off.

Now say for examples sake at 1000RPM you had.

Write down those values just like you did for the first test.

1000 RPM 24.1G/s .47v

Your stock MAF flow reading was

1000 RPM 59.0G/s 1.3v

So go to table B0201 and correct the voltage from the new intake to read the Grams/sec of the stock one.

This should get you close.