High Performance MAF Sensor

[aj_111_78]

Has any one upgraded to this Granatelli High Performance MAF Sensor or something similar to it with an after market intake? Did you see any real inprovements? I am running a K&N intake and was thinking about getting this but I am Curious if its worth it.




http://www.mossh2.com/Shop/ViewProdu...eIndexID=54971

[dochummer]

I have the granatelli, the airaid filter and tube and Hypertech. I noticed a bit more pickup off the line. but nothing huge...

[HUMMERcustoms.com/TAZ]

I had Granatelli on 99 Silverado with 5.3L and felt it of little help. So did not even look at one for H2. Even under boost of supercharger I see stock MAF doing fine up to 10lb. boost setup maybe a little less. I will need to look at maping tuner software above 5lbs. of boost and just eliminate the MAF completely since I have invested in tuning software anyway..

Plus since I'm moving to higher boost anyway I'm going back and store a tune for 5lb. boost as well since i can change boost level with change of a pulley. Then just flash the tune that goes with it.

Just an opinion but, do not feel it is worth the money when You could go to a tuning shop and just get a better tune for even the stock setup which will get the hidden HP and torque. Custom tuning is not just for boosted engines.
Go get all You can wth MAF money saved by getting a custom tune. You will be pleasantly surprised. Custom tune will get You more than what a handheld tuner will get. Having the handheld just allows You to go back and forth when You want to be completely stock.

When You get any tune make sure if you go into dealer that You either return the stock tune or make sure the dealer knows you have a custom tune. If You do not tell service dept. when they hook up to do any diagnosis their equipment will automaticly overwrite the custom tune. It recognizes that something is different than stock tune and want to get rid of it. Then replace it with something normal to machine the dealer uses.

TAZ

[obzidian]

i agree, for just about the same amount of money, you can get a pcm tuning software and get way more out of your stock lq9.

the granatelli is a good product but has been problematic during tunning.

TAZ, for sure you should go SD, also, im not sure if you have seen this, but a MafPro will allow you to, i believe, target a secific a/f ratio under WOT and adjusts your spark/fuel multipliers accordingly. Thus, giving you the opportunity to let say, increase your boost level, in cab, up to 20psi from 15psi and not have to worry about re-writing your pcm EVERYTIME!!

pretty trick huh? The big names in tunning, like the BS3 have this feature, all you have to do is implement the mafpro into your rig and your set.

[HUMMERcustoms.com/TAZ]

I'll check that out obzidian.

The problem I see after having been thinking about solving the boost and tune changes is that the higher the boost goes the less accurate the modules look to potential be. I have visited with an owner of HPTUNERS and they are looking at this as well. If you are running on the edge of blowing up or not, a small amount of variance could be very harmful. I have talked to MSD Inc. about this also. I love there multiple spark controllers. What has happened to Accel anyway? It seems they have conceded the high tech stuff to MSD but, has continued to hold there own in the older muscle car needs. Sorry just came to mind as i was thinking about this.

I think You are correct in us looking that direction and it may do the job. The problem is different with supercharging versus turbo with an electronic controlled waste gate. You still even in that situation cannot have as sharp a tune as you would like because to many variables still exsist when really pushing the edge even with a turbo.

If you are trying to stretch a tune to cover to broad of a boost range they tell me the less accurate the tune is going to half to be or more liberal on one end of the spectrum than the other. None are sure yet how to get a round that from what I understand. On supercharger will someone design an adjustable SC pulley like grain harvesters use to change air volume that is blown through the crop to seperate crop from trash while it is on the go? That was the first thought I had since I farmed most of my life and was familiar with the cab controlled air speed that came along in late 70's and early 80's. Now no one even thinks about them being there since it is standard now. One side of pulley is rigged and the other is moved in and out with either an electric motor or by hydraulic force. Off the wall I guess as it would still have variables as the belts used wear out the width real quick from being squeezed in and out all the time. I had to stop thinking about it awhile because it hurt and I'm very familiar with the problems that system caused even in the newest machines on the farm still using the method. But, in that use it does not matter if air speed is of 100rpm or not. If the belts wear down it does not matter the pulley squeezes down till it gets the rpm you need on the gauge in the cab.

The main problem being in a SC is the pulley determines what boost is and each pulley can be 1/2lb. or so of boost different but, it does not matter as we tune to match the pulley and any amount of boost that we get on boost gauge. There are some problems I wonder if we are not going to get around when trying to be a tenth away from blowing a hole in a piston. I would think somebody will tweak it to be usuable in a general situation and it be safe.
But, I'm a little unsure about wanting to trust anything but the pulley I have the boost it gives and the tune to match. Then I want to keep close watch on the wear of the fan belt used. If tune is made with a new belt it needs to be maintained that way. So it still falls to degree of tolerance one can get for the use each has in store for the motor and ride.

I think the situation will end up being solved by having a gear box on the SC to be adjusted from driver seat so that You can have precise tunes to match a more precise boost adjustment. That may be a gear box on the front of the SC thus not changing pulley and then allowing for tune changing easier and more so trustworthy.

In my situation as others I'm going to tune as tight as i can based on a boost that I know I have with a certain pulley in hand. Then along with the fan belt age or wear. I'm guessing the problem is not going to be as temperamental when You are allowing alot of tolerance.

So I will sit back and watch what happens with advancement. I can change a pulley in a few minutes while waiting for computer to upload the tune and reflash with another tune. Maybe total time 10 minutes which would be at a track then change it back before heading out. I think Your suggestion would work real good in lower boost range in what would be the daily running around mode. I'm still out on this though till I see more numbers and especially what my sponsor HPTUNERS think as they look at it more.

Thanks for good info!!

TAZ

[tomp]

At the MossH2 price, I would do it for sure! It "will" help some. I like mine and paid the retail price for it