HAS ANYONE OUT THERE HAD ANY DEALINGS WITH UPGRADING THE MAF SENSOR. GRANATELLI HAS ONE LISTED FOR THE DMAX. MUST BE NEW FOR DEISEL TO RUN MAF SENSOR UNTIL THE DMAX. NOW THE F##D 6.0 LITER IS RUNNING ONE TOO.
Be careful with Granatelli MAF's. It is a common mod on GM gas motors, but it has mixed results and no where near the advertised gains.
What a MAF does on a gas engine is to allow the engine to "know" exactly how much air is coming in so it can acheive a stoimetric(?) fuel/air ratio to keep the engine running clean, and to allow for the right amount of fuel to added at WOT conditions. By "tweaking" the MAF, you can make the engine run richer or leaner by fooling the computer.
Why a diesel needs one is something I wish I knew. It doesn't have to maintain a perfect ratio to run. It runs lean by nature. You can't run a gas motor lean or it blows up. Not true with the diesel. If you add too much fuel to a gasser, the engine runs like crap, again the diesel just makes more power instead.
If it is used like they use one for in a gas motor, you would be able to increase HP by unshielding the MAF or putting a small vane in their to show more air than is actually flowing.
I think the replaceing the MAF sensor would be futile. These trucks flow more air at idle then most cars do at WOT. I know that some aftermarket MAF sensors were larger bored then the oem, but our are just a finger in the airstream.
In Mustang world you upgrade the MAF for one reason. You have upgraded so many other engine componets that the stock MAF needs to be recalibrated. Basically the maf reads between 0 to 5 volts depending on air density and speed. Upgraded motors pull so much air that the sensor is pegged at 5 volts and the motor is still flowing more air. You need a new sensor ( thin wire cooled by moving air) so that it is responsive to your min and max air flow. I personally have no idea if the Granatelli upgrade will help a Dmax. I know on Mustangs you have no choice after upgrades or else they just will not run correct.
What someone needs to do is hook a datalogger to a Duramax, and do some stock WOT testing. Record RPM, gear, injector pulse duration, throttle position (go pedal), and MAF reading. (Yes, I know a diesel does not have a throttle).
Next do the same thing without the MAF in place.
All this will tell is whether the MAF can PULL fuel from the motor. Next, you would need to figure out a way to make the MAF see more air that is really there. Hmmm... perhaps immerse it cold water? Nope. Might damage the MAF. Need to think...
Create a small venturi using a piece of alum can securely attached to the inside of the intake tube. You need to focus more air onto the MAF element.
Do the testing again.
If the MAF function is higher, and the injector pulse width increases, you can increase engine output by modifying the MAF sensor. Either electronically or using airflow techniques.
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