You wonder sometimes how long these bad mods will continue to perpetrate? Eons ago when I was a teenager the great "mod" of the day was to jack up the rear of your car so it "looked like a drag racer". Never mind that it handled like a dump truck, wore the front end out because of the cockeyed alignment, and exposed the gas tank to a rupture in even the slightest rear end collision. It seems like no matter how asinine a particular mod may be, people will still do it if someone says it is "cool", ties it to some kind of junk science, or points out that "race cars have it".

 

well weve had this argument many times on this forum so lets not start another one.

 

Seriously though!! Unless you have tuning software, then you have no idea what you are talking about!! It is different on every vehicle!! Some will take to the affects better than others. This difference depends on how accurate the calibrations are in the MAF table and VE table!!! If your VE and MAF are already way off, and you LTFT are out of wack before you even removed the screen, then removing the screen wouldn't be the best idea unless you can TUNE IT!!!! It does however flow more CFM and at less turbulent flow characteristics when the screen is not there!! All the z06's come without the screen fyi...even my buddy's 04 Z06

 

Is a Granatelli MAF de-screened sensor any better than the stock MAF with or with out a screen?

 

No!!!!!! Granatelli's are very hard to tune!! Reason being, they have two small holes in the center bar that is between the 5 sensor bars!!! Since it is between the sensors, the MAF cannot calculate the extra airflow therefor making your vehicle run lean!!! Alot of people have trouble tuning this issue because there is no actual scale to use for calibrating it. Unless you have WBO2 then you will never get it where you need it to be!!! If you have a Granatelli then the general idea, that I've sort of came up with on my own since nobody had a good answer for me, is to make your VE table start reading -5% to about -8% fuel trims!!! Then when you calibrate the MAF table, make the fuel trims read 0% to about +2%. This should help the computer make the correct decision on fueling since you already compinsated for the Granatelli's natural lean curve!! Hope that helps!!

 

If you want to donate that descreened MAF to a worthy cause (my project) I'll gladly accept it.

 

i too descreened my 2000 5.3l and it runs fine, never noticed a difference good or bad but then again i do have a tune so who knows

 

My '01 4.8 has been descreened since I bought it. No problems. I also descreened my '99 4.3 Sten. Also with no problems. Does it help? ...I don't know, maybe the performance is all in my head. The aftermarket MAFs come descreened. I'm sorry to hear that you are having problems. I think that the 2 are probably unrelated.

 

I know 99% of poeple that have the Granatelli MAF have problems but some have had great sucess with it. My question would be, If one were going to go to Granatelli Himself for a Dyno tune would his MAF then be a good idea.

 

Done this with many many cars/trucks never had a problem. Think about it if it doesnt do that much for performance ie 1hp/1tq then how could it need a tune. It gets better hp and tq due to better flow right well thats not much more flow so why would you need to tune. My maro ss gained 5hp to the wheels with this mod. Nay sayers will say it was the air or some other factor with dyno results but this is what I gained. Who ever said it straightens air flow is off, GM claims it keeps debris out which it really doesnt.....this is why they dont need it on the Z06.