MAF Calibration?

[OldSkool69]

Dudes,

I'm trying to settle down my truck from 1000 to 2300rpm.

I'm guessing the fault is the maf calibration!!!!

I had this Grannattelli MAF CAI tuned, but it just send values from hell, so Allen told me to change to the stock one.

Since I have CAI TB80mm and my kind of high cam, I want to know wich is the OE MAF threshold?

Any one can give me a hint on where to star in this values?

My Black Truck Has a Grannatelli MAF non CAI tune, and is tuned by Allen. When I check the values of that one, I see them like to high for the original MAF

Any hints will be apreciated, thanks in advance.......

[FlaBouy]

<div class='quotetop'>QUOTE(Gabe &#064; Sep 7 2006, 11&#58;30 AM) [snapback]64255[/snapback]</div>

Dudes,

I&#39;m trying to settle down my truck from 1000 to 2300rpm.

I&#39;m guessing the fault is the maf calibration&#33;&#33;&#33;&#33;

I had this Grannattelli MAF CAI tuned, but it just send values from hell, so Allen told me to change to the stock one.

Since I have CAI TB80mm and my kind of high cam, I want to know wich is the OE MAF threshold?

Any one can give me a hint on where to star in this values?

My Black Truck Has a Grannatelli MAF non CAI tune, and is tuned by Allen. When I check the values of that one, I see them like to high for the original MAF

Any hints will be apreciated, thanks in advance.......
[/b]

I tune with HP Tuners and all I can say is there will be no way to rescale a MAF without logging the truck and seeing error against a know VE table...... When you change any MAF, whether you are changing to another stock or aftermarket MAF, you must tune to that particular MAF. Since the MAF is the driving force behind fueling at WOT on a stock NA tune, then it is important to scale the MAF to meet your specific AFR requirement.

Not sure I understand the threshold question, but I know a stock or Granatelli MAF is good for about 60 lb/min of airflow. Most stock 5.3L will flow 32-35 lb/min at WOT. My blown 12 psi 5.3L is maxing the MAF out at 65 lb/min at 185 kPA. So unless you know your airflow rate at this point, not sure how you would know if you are meeting the limitations of the MAF.

It is easy to scale a MAF using the HPT log and tuning package....

[OldSkool69]

FlaBouy

It is easy to scale a MAF using the HPT log and tuning package....[/b]

HEre dude is where a want an ABC training.....don&#39;t know what the heck is that. I also Use HPTuners.

I,ve been working on scaling my maf..here&#39;s an example

1.64063 1.95313 2.29688 2.67188 3.09375 3.74219 4.28906 4.74219 5.36719 6.02344 6.74219 7.53125 8.37500 9.28125 10.25781 11.27344 12.38281 13.57813 14.85156 16.23438 17.71875 19.29688 20.98438 22.77344 24.65625 26.64844 28.73438 30.92188 33.20313 35.59375 38.09375 40.74219 43.55469 46.52344 49.64844 52.90625 56.30469 59.85156 63.54688 67.37500 71.36719 75.51563 79.84375 84.35156 89.03125 93.88281 98.90625 104.08594 109.44531 114.96875 120.73438 126.92188 133.52344 140.12500 146.67188 153.34375 160.19531 167.26563 174.70313 183.07813 192.66406 202.26563 212.47656 222.72656 232.98438 243.79688 254.32813 265.15625 276.66406 287.98438 299.10156 310.39844 322.00781 333.95313 346.27344 358.99219 372.12500 385.69531 399.75781 414.32813 429.48438 445.25781 461.67188 478.75781 496.31250

but that dont seem to work as I thought, is better, but not good

[Motocycleguy]

Have fun dialing it in, Mines a &#036;400 paper weight.

[chrisj6]

Easiest way to dial it in is over your already dialed in VE table so you can just lay the MAF table right over it. Use a wideband and AFR error % to dial in the VE then reenable the MAF and start with the stock table and go from there.

[Motocycleguy]

<div class='quotetop'>QUOTE(chrisj6 &#064; Sep 7 2006, 08&#58;05 PM) [snapback]64314[/snapback]</div>

Easiest way to dial it in is over your already dialed in VE table so you can just lay the MAF table right over it. Use a wideband and AFR error % to dial in the VE then reenable the MAF and start with the stock table and go from there.
[/b]

Im not sure? But I think he knows how to scale the MAF?. Problem is its a Granattelli MAF, They are notorious for there problems. Some guys can stick them in with no tuning and be fine, But most cant and cause big headaches.

I would go back to the stock MAF and dial it in, Or at least scale the stock MAF then install the Granattelli to get you not even close. Wash, Rinse and Repeat.

[OldSkool69]

Thanks dude, I just started hating those Granattelli MAF, Cant wait for my SD tune&#33;&#33;&#33;&#33; now them I&#39;ll send Mr. Grannattelli a big finger&#33;&#33;&#33;&#33;&#33;

[FlaBouy]

Sorry, been out a few days... I agree with the others.... Two basic dont&#39;s when it comes to MAF&#39;s....

Never buy a Granatelli and never descreen..............

I dial in VE table with the wideband AFR % error technique, and then turn MAF back on once the VE table is zero&#39;d or has a slight negative bias to keep any trim from following me into PE.... Then use the histogram to tighten up the MAF.......

Good Luck

[OldSkool69]

FlaBouy,

Thanks, I&#39;ll need it&#33;&#33;&#33;&#33;

Just felling deperate and with some EVO rice hunger