Racebrewer

Mornin'

I'm new to Honda MAF sensors. Does the Honda ECU see a DC voltage from the MAF or does it see a changing frequency signal?

If it sees a DC voltage, what is the best way to increase the voltage so that the ECU will accept a larger diameter CAI? My understanding is that a larger diameter CAI causes the MAF signal to drop causing the computer to throw a CEL.

Thanks,
John

manxman

CAI's don't cause CEL's. At least the PRM intake systems don't. The diameter of the intake system isn't going to change how much air goes into the throttle body.

teamkitty

The Fit's MAF is located directly in a tube of the intake, as opposed to in the throttle body, so yes, CAI's do indeed cause CEL's on systems like that of the fit. Manxman, try building a CAI with a larger diameter (or smaller) intake tube and get back to us.

"The diameter of the intake system isn't going to change how much air goes into the throttle body." But, it will change how much air is recorded by the MAF and throw a CEL. Guaranteed.

As far as the original question, I hope somebody knows. Somebody besides Manxman.

manxman

The tube and filter of most CAI's that are made to fit the GE8 Fit are larger in diameter than any of the passages in the stock air box. None of them cause CEL's. The PRM intake does not cause CEL's. Why don't you get back to us with truthful info. for a nice change? Intake diameter does not make any difference in how much air mass can flow through the throttle body.

The MAF sensor is also located in the tube of any CAI. There goes your argument.

manxman

John,

There are thousand of us who use various brands of CAI's on our Fits. None of us have needed to "change the voltage" of the MAF sensor in order to get rid of a CEL, and the only way to get a CEL in the first place is to fail to tighten all of the hoses and sensors when you install the intake system.

Instead of reading B.S. posts, why not read reviews of all of the CAI brands on REAL Fit forums? You can ask CAI owners about your questions.

Or, you can believe the people who don't know the answer to your question, but make up b.s. because they don't have anything else to say. It's up to you.

Depending on the design of your CAI, you may have to go through the "Idle relearn" procedure that allows the computer to learn the new, slightly different sensor current that results from higher air velocity due to lower restriction of the new filter. In most cases, this procedure is not necessary. It is not necessary with the PRM intake system.

teamkitty

Wrong again manxman! Nobody is talking about the PRM intake aside from you. Basing your opinion on a sample size of one is pretty ignorant. Ever wonder why the takeda intake tube narrows in diameter only where the MAF sensor attached? Ever wonder why the T1R intake throws codes? The answer is in the diameter of the pipe where the MAF attaches.

"Intake diameter does not make any difference in how much air mass can flow through the throttle body." You've said this twice now and I agree with you. What i disagree with is your ignorance to the fact that intake diameter vastly affects the readings of the MAF, throwing CELs. Can't argue with the facts.

Now, about the original question...

Racebrewer

Geez,

Glad I didn't ask about the economy, gay marriage or religion, etc, etc......<LOL>

Actually several people have reported the problem on Fitfreak.net. Most manufacturers resolve the issue with necked down MAF sections except for AEM who uses an electronic widget of some sort (perhaps a voltage divider that feeds the MAF sensor a higher than expected voltage). The necked down section strikes me as being a restriction on airflow so I'd like to find a way around it so I can roll my own CAI without a big expense.

Any thoughts guys?

John

manxman

Despite what you read from some ignorant members, the smart GE8 owners bought the best intake, not the plastic toaster oven from T1R, and not the overdone crap from Takeda. PRM was the first, and is still the best CAI for the '09/'10 Fit. The diameter of the intake's fit where it joins the throttle body is what counts, and guess what? That is where the PRM intake has the MAF port.

If you read a post from several owners of some brand of CAI and they are all complaining about CEL's, the logical conclusion is that the CAI being reported on IS NOT PROPERLY MADE for the GE8 Fit. The T1R for the GE8 was a mistake right from the start.

I personally do not care what intake the OP buys. A properly made CAI is not going to cause CEL's. If the CAI that you buy already has posts complaining about CEL's, then you just bought the wrong intake. There have been several intake systems for Fits that were badly designed, and one of them was made by K&N for the GD3. I'm sure that there will be more badly designed intake systems being sold for the Fit.

teamkitty

PRM sure does make a really nice intake. Beating a dead horse. The MAF port on the PRM piece is located on a tube that is of the same diameter as the OEM piece. Thank you for proving my point. The end.

manxman

It actually never occurred to me that manufacturers were still trying to sell intakes for the GE8 Fit that cause CEL's. Why anyone would be interested in buying these things is amazing to me. It makes absolutely no sense from an engineering standpoint to have the inlet tubing of any intake system that is larger than the throttle body. If you buy such an intake, you deserve what you get.

In a Private Message, the above member calls me a "douche" and a "f*cking moron". Some people think that vulgar language makes up for their lack of intelligence. I don't. It's too bad that Moderator builthatch deleted this same members threat, on another thread. He was going to beat me to death with a very strange part of his anatomy (that probably doesn't exist anyway). Funniest post I ever read. Builthatch didn't like it.

So, I was WRONG in saying that CAI's don't cause CEL's. I guess that some do. Don't buy them. Buy good ones instead.

Racebrewer

Mornin'

I'm new to Honda MAF sensors. Does the Honda ECU see a DC voltage from the MAF or does it see a changing frequency signal?

If it sees a DC voltage, what is the best way to increase the voltage so that the ECU will accept a larger diameter CAI? My understanding is that a larger diameter CAI causes the MAF signal to drop causing the computer to throw a CEL.

Actually several people have reported the problem on Fitfreak.net. Most manufacturers resolve the issue with necked down MAF sections except for AEM who uses an electronic widget of some sort (perhaps a voltage divider that feeds the MAF sensor a higher than expected voltage). The necked down section strikes me as being a restriction on airflow so I'd like to find a way around it so I can roll my own CAI without a big expense.

Any thoughts guys?

John