Not trying to be rude but could somebody please answer my above question? The one that is like 4 posts up from this one? Thanks,
FLeX

 

ask madz. He didnt seem to have any troubles with mine. I doubt it will be a problem, but he should know for sure.

 

there is no way the Granatelli maf will help your car long term. if it doesnt trick the pcm to it can add hp. if its calibrated to tell the pcm the accurated air flow then the pcm would still add fuel (if it accualy ot you more air in the engine.) becuase it goal is to hit 14.7to 1 a/f ratio. so if it doesnt trick the computer it worthless.

now if it does trick the pcm it will relearn the fuel corrections in a couple of days. thus its worthless agian.

the reason lingenfelter was prabably using it, was becuase he was probably making enough power on the dyno to need extra air flow. by the way the stock maf is good to 550 rwhp.

you tell me what it does to the air or fuel to gain power. (add dont tell ne it calibrated, that gives it power) and then ill beleive it (maybe)


by the way take it off and sell it on the board to someone who really wants one, and put a stocker back on, im glad i did.

 

If your claim is correct, then the onus is on you to explain how it adds horsepower without tricking the PCM.

Ignoring the pcm's limit for air intake, the stock maf can flow enough air to produce over 2000rwhp if you like, but that doesnt mean it wont be a restriction.

The screen is the restriction on the stock MAF. If you take the screen out, the stock maf will not give accurate readings to the pcm, whereas the granatelli, without the screen, will. Thus it allows for more airflow, which at the same fuel ratio = more HP.

 

the limit for air intake is set by the maf, it 500 gps (only obd2) not obd1. theres no limit for obd1. and this can be solve with lt1edit for the obd 2 people.

i may have mis spoke im saying if it tricks the pcm, by letting more air in and telling the pcm that theres less air coming in. the o2s will pick up the extra air and lower the blms to add more fuel becuase it sees the extra oxygen in the exhuast, so it will corect for the extra air. this is temporary hp.

now if it callibrated accuratly there will be no gain becuase the pcm will add fuel if theres accually more air coming in. but theres not any more air coming in because the stock maf and the stock intake are more than enough for a stock engine it wont take any more air with a different maf on it.

the screen is not a restriction, it is there to give a accurate reading by straightening the air so it not turbulent. a restiction is something holding back the air from the engine to prevent power and the stock maf does not do this.


but what makes me wonder about this maf thing is, instead of buy the maf why not by tunercat and you can do anyhtign to the maf calibration you want, sence the stock maf is plenty for a stock or even camed car, and tunercat only cost a 100 bucks. save 225.

people need to learn more about the function of most all the sensors and pcm fueling on you car before you start claiming gains from a new maf. you would understand why not to buy it. (at least at this point in time) and if you out grow the stocker you probably would be better off tuning in speed density and doing away with the maf.

oh and by the way www.ws6.com tested the maf and picked up some hp. and a few days later lost all the gains, and thats dyno proven. that also porves that the stocker was suffecient in providing enough air for the engine, becuase if it was a restriction it would keep the gains because it got rid of the so called resriction

 

you didnt understand what i was saying.

you claim that the granatelli will NOT result in a horsepower increase if it does not trick the PCM. The fact it, it DOES provide and horsepower increase AND it does not trick the pcm.

Just because the purpose of the screen is to smooth out the flow of air does not mean that it is not a restriction.

I could not find the link on ws6.com to the dyno test. If there is a dyno test on a granatelli maf sensor that shows a temporary power increase, this would prove they are falsely advertising and the question would be settled. Please show a link because i had trouble finding it.

thanx

 

ok you have a engine that has 500 hp and the stock maf is suffecient in supplying air that 500 hp engine what is a bigger maf sensor on a stock engine good for... nothing. the engine will only take so much air unless force it in. unless it alters the amount of air acctual (grams per second) not tricking the pcm, accually more air. it can NOT improve hp.

 

if a motor is producing 500HP on a stock maf, and the vacuum at the manifold is 30inches mercury, that means there is a restriction somewhere. If that restriction is removed, the vacuum in the manifold will go down, airflow will increase, and horsepower will increase.

SO now you put in a granatelli mafsensor, and the vacuum in the manifold goes down to say... 25 inches mercury at full throttle. This means there is less of a restriction and more air is making it into the motor, and you are producing, say... 525HP.

its a very crude example. This is analagous to producing 500hp on stock manifolds. Chaning to headers will increase the HP, by decreasing restriction and allowing more air to flow.

anyway, the only real way to know is to dyno with a granatelli on a stock motor immediately and a few hundred miles after installation.

 

There were a few maf tables which the PCM uses for calibrating the MAF.
The Hz returned by the sensor determines the gm/sec.

Can't all this be solved by just measuring the Grantelli MAF's Airflow and reading the Hz at different airflows. Then plot out the Hz vs Gm/sec on paper and set the table in the PCM for the MAF sensor to what the graph reads?

Once this is done anyone can put a Grantelli MAF in and calibrate the computer properly for it. Does Grantelli supplie such a table? Or does anyone know where one can be found? It should be simple once we find one and everyone can go out and buy a Grantelli MAF, program their MAF tables and know its set right....

 

What he said was correct you might see a gain for a few weeks but in the long run its a huge waste of money

 

I have to agree that the Granatelli is a huge waste of money BUT, it was already on the car when I bought it back so now I'm wondering what to do with this $300 MAF sensor that I basically got for free. I read a thread a couple days ago that had comparisons but they didn't get around to testing the Granatelli. All they did was test the stocker without a screen and then with ported MAF ends. I was unhappy with the test results on the stocker after finding that the stock setting caused the car to run better than the ported setting. What I am wondering is if Granatelli programmed their MAF to tell the computer that the extra air flow is okay and not to make the AFR dangerous.

 

you can make 330rwhp on an lt1 with stock exhaust manifolds. Does this mean that somebody with 290rwhp will not gain anything from headers?

If the granatelli maf sensor gains are due to leaning the combustion mixture, the gains will be temporary. If the gains are due to reduced restriction through removal of the screen, that reduced restriction will not disappear over time.

The bottom line remains: the only way to know for sure what the gains are with a granatelli maf sensor, and if they disappear, is to find out on a dyno.

 

it cant tell the computer to make udjustments it can only tell the pcm how much air is coming in. and if its lying the pcm will correct for it.

no it does not, but sence the maf will flow more air at 28"of hg than the car can take in at 28"of hg, this means it is not a restriction.

the first restriction is the TB.

 

If at WOT and the engine is sufficiently modified, the engine may need more air than the maf can supply. Not more than the MAF Can read.
Super simplified example:
1. Stock MAF will read up to 500 GPS theoretically.
2. Stock MAF will flow up to 250 GPS without causing too much restriction.
3. Stock MAF after 250 GPS may still flow but more and more energy from the engine will be needed to go above 250 GPS.
4. Because of #1, #3 will still accuratly report the correct GPS.

1. Grantelli MAF will read up to 500 GPS theoretically.
2. Grantelli MAF will flow up to 350 GPS without causing too much restriction.
3. Grantelli MAF after 350 GPS may still flow but more and more energy from the engine will be needed to go above 350 GPS.

The TB may or may not be a restriction, but that doesnt mean the MAF isn't adding to it either.

My gut feeling is that the Grantelli mafs are calibrated to accuratly report the amount of air going in... but like my post above implies, we don't know this for sure because nobodys really been able to measure the grantelli MAF readings vs actual airflow! They also have a P/N for a cold air calibrated MAF. Which really seems odd to me and i'm thinking that that might be intentionally "mis calibrated". Again, a chart of this MAF would tell us exactly whats going on as well.

I think on their website they "claim" that the HP gains stayed. But thats hardley an impartial view

 

Time to try the truth machine. Dyno before and after install, and then a few hundred miles after install.