here are the numbers from infiniti computer for low dynoed 03 m 45.

[caug]

here are the numbers from infiniti computer.#1.eng speed 650rpmmas a/f se-b1 1.32vcal/ld value 18%mass air flow 4.35gm/s#2.eng speed 2475mas a/f se-b1 1.11vcal/ld value 16%mass ari flow 16.42#3.eng speed 2500rpmmas a/f se-b1 1.94vcal/ld value 15%mass ari flow 16.30 gmsplease let me know if these looks good.thanks,caug

[maxnix]

Seems strange that you are flowing less air at a higher RPM in 3 than 2.

[Q45tech]

#1.eng speed 650rpmmas a/f se-b1 1.32vcal/ld value 18%mass air flow 4.35gm/s

Looks like a normal warm idle, the others are transitional. The mass air flow should follow the rpm if the load is the same...................and it does.

At HP peak rpm and 100% load the mass air flow might be 255 gm/s.........50 times more air flowing into engine per second than at idle.

Normally there is one MAF voltage that corresponds to one mass air flow.

It is confusing that the same ~~2500 rpm mass flow shows 2 different MAF voltages.

[caug]

this is with stock air filter test.i had k&n filter removed an hour before the test.It was a new filter, i had it in for a couple of month. i know that oil from the filter might mess up the mas air sensor, but i never cleaned it and never reoiled it. so should be no problem i hope.thank,caug.

[Q45tech]

The MAF voltage is way to gross to make measurements with tiny variations, BECAUSE you can almost never duplicate the air temperature, humidity, and barometric pressure.

Manometers can be acquired with 0-10" H20 [0-1/3psi] or 0-3" H2O ................since a factory air filter only causes 1" H20 or 1/27.7 th of a psi loss..............these devices can resolve down to 0.1" or better that is 6.8%/ 277 or 0.025 of a single percent in power loss.

The point is oem filter are very very very good and anything better flowing will have to by definition allow more destructive dirt into engine decreasing it's ultimate life.

To gain a few horsepower [at best] and decrease the end life a significant amount [ring wear] is not much of an economic trade off.

[caug1]

I UNDERSTAN ALL OF THIS AND I AGREE WITH YOU ON DIFFERENT FILTERS.I JUST WANTED TO SEE IF BRAND NEW K&N VS. REOILED ONE COULD MESS UP THE MASS AIR SENSOR.I DID NOT TELL THIS TO DEALER.THANKS.

[maxnix]

PLEASE DON'T SHOUT AT US!

Ok, now that we are back to a polite level, you should know that oil from a K&N filter will shorten the MAF life by contaminanting it. But the good news is you have all kinds for performance issues just before it craters.
Modified by maxnix at 9:12 PM 3/15/2007

[caug]

what do you mean, all kinds of performance issues?like what?

[maxnix]

Like you are experiencing now.

Think what a dirty MAF wire would do to its calibration.

[caug]

so you think that k&n messed up my air sensor?i had no check engine or any other lights to come up.my car feels very strong no any kind of hesitations or anything funny going on.i will take it to the drag strip first week in april.it should run high 13s and over100mph.if car do that , i will be all set.

[Q45tech]

For MAF low air flow [idle and cruise] is harder to get correct than WOT high flow.

Automobiles are always a good learning experience, how aftermarket pumped items can bite you big time. Every mod always has some downside.

[maxnix]

Depends how long you have been running K&N air filter and how oily it is.

If you can do 13s at over a 100mph, that is strong.

[caug1]

K&N FOR 2 TWO. IT WAS BRAND NEW THEY ALL THE SAME OIL LEVEL. IT WASN'T DRIPPING ON THE FLOOR. I THINK K&N KNOW WHAT THEY DOING.I HOPE MY CAR RUNS 13S.

[CrimsonQ]

Damn dude, you just got a few hundred dollars worth of REAL tech advice and you end by being a d!ck?

tap the caps lock button

[caug1]

<rant edited my Administrator>

LOVE AND PEASE,CAUG

[maxnix]

Caug1, this site is about knowledge and politeness.

You have neither, nor apparently do you wish to acquire either.

Good luck. You'll need it.

[Repo Man]

<rant edited by Administrator>

LOVE AND PEASE,CAUG

Caug, he said you were being a d!ck, not that you are a d!ck. There is a big difference. It is a fact that typing in all caps is bad netiquette and anyone that spends much time online knows that. Everyone here that has helped you spends a large amount of time online, especially here at NICO, for no financial gain, just the love of cars and sharing of knowledge.

You need to relax and just not type in all caps as it implies that you are yelling at someone. Then when CrimsonQ brings this to your attention, you tell him to "**** off". Not cool, but hey if we all just chill we can let it go and move on.

I'm leaving this open as I have faith in Infiniti guys that we can bring this back to a mature technical discussion. Please don't prove me wrong.

Thanks.

repo

[audtatious]

In addition to what Repo just said, we have rules on this site concerning proper etiquette which you have broken. If you don't like the answers you are receiving then you can easily go somewhere else and try to find another site with members willing to discuss your airflow questions. Good luck with that.

[caug1]

i dont send lots of time on computer, so i dont pay attantion to cap or no caps stuff. i use this site as tech info only. i dont want people teaching me things that not about cars. if people dont like my typing then they shoudn't reply to me.i am here only to give or to get the tech info.i dont type well i dont know how to spell check. but i do know about cars and want to learn more. that is why i am here.please lets talk cars not the colors of the cars. i hope you know what i mean by this.thanks,caug

[audtatious]

Talking cars and talking tech is fine. On internet forums (all forums), typing in all caps is screaming. I don't care what forum you are on the result will be the same. Spend the extra second it takes to ensure the caps lock is not on and there are no problems.

You have two user accounts, which one do you want?

[Repo Man]

Caug, I hear what you're saying but you need to understand that each society, actual or eSociety (such as a forum), has it's own rules that must be abided by. If you cannot abide by our rules, which are in place for a reason, then please leave. I hope that you don't do that, but I guess some feel a need to resist rules just by the virtue of them being rules.

[Q45tech]

K&N DOES KNOW what they are doing they spend insane amounts of money on advertising, payolla authors to write good stories, and provide sponsorships of every class and massive free give aways and bid military helicopter filter contracts just to say they are used.

Wonder if anyone has checked for a correlation of crashes?

What a knowlegable company does - pay to confuse your customers.

[Jesda]

Quote »K&N is simply the company that spends the most ad dollars and thereforegets the most attention. I learned my very expensive K&N lessionover 20 years ago when I was actively building racing engines. K&Nhad some contingency money available so I replaced our Filtron(Oiled foam) filters on our motocross bikes with K&N. An engine that would normally last 10-15 heats was completely trashed by dirt before the first one was over. Frankly I've never seen such massivefilter failure. [/quote]http://yarchive.net/car/k+n_filters.html

[CrimsonQ]

Sorry guys didnt mean to rile em up.

I just hate to see good advice go unappreciated

Techs advice and others here are what keeps my car rolling

[AZhitman]

Great article on the REAL WORLD tests of a K&N: http://www.nicoclub.com/articles.php?id=180100

[jamestgk]

PLEASE DON'T SHOUT AT US!

Ok, now that we are back to a polite level, you should know that oil from a K&N filter will shorten the MAF life by contaminanting it. But the good news is you have all kinds for performance issues just before it craters.

Modified by maxnix at 9:12 PM 3/15/2007

actually this is not true. i personally have contacted K&N and they have said their testing has not shown the oil will hurt the maf. as well as they have no reorts of such happening. now for those of you who over oil you maybe promotting a problem.

as for filtering perfomance, the ISO test was shocking. i wouldnt have thought K&N would have skipped that test. oh well guess ill be adding a foam cover to mine.
Modified by jamestgk at 5:02 AM 3/18/2007

[audtatious]

I called Philip Morris and they told me that smoking does not hurt me either

[jamestgk]

ha thats funny, hope you smoke filtered. as an ASE tech i have seen a many high blow by engine with oil down to the filter and have yet replaced a maf. then there is the fact i have 15 years of using K&N on different vehicles and no maf failures

[CrimsonQ]

thats cool if you like them. I had 1 on my cobra and it killed the maf. Thats enough evidence for me.

wonder why real race cars and drag cars dont run k&n?

[audtatious]

The Maxima community saw a large number of MAFs go out in the 2k2-2k3 models when K&N filters were used. Now, I can't say they are correct in the assumption that the filters were the cause since I have had a K&N on my Maxima for 40k miles thus far without any problems.