PTYIS2

Hopefully, someone had experience this and can provide me with another perspective of why this happens.

I have noticed that sometimes the sound made by the intake is like the flap stays close because it doesn´t sound as loud as most of the time.

Could it be possible that this is done by the ECU when there is heatsoak? or Because i have an after market drop in element, ECU is adjusting something, or what else could trigger this? I have the stock airbox with an AFE dry drop in.

for instance.......today driving to work got behind a truck that was goin around 5-10 Miles, so I got ready to overtake him.....so im i 1st gear driving slowly at around 5% of throttle at 3800 RMPs above the revs point where the flap opens, but you cant tell if it open because of the little throttle, then i step on the gas, expecting to hear the growl, but instead all i hear a very soft sound like if the flap didn´t opened, and i could be wrong but it also feels with less power.

any ideas?

Vervish

iTrader: (4)

I had the same problem - turned out to be that the dealer checked my air filter and did not fully seal my airbox, they left it unsealed at the very bottom.

Check your airbox - especially the bottom hinge...

PTYIS2

Just checked, it was fully sealed. So it got to be something else.

JP

Joker4096

iTrader: (2)

Check the vacuum line to the flap control.

av8or

or just remove that vacuum line and tape both ends shut, where it ends and where it connects.. no more waiting for 3k rpm.. growl away..

FFM

It doesn't open just based on RPM does it? I'd imagine it's more based on the engine load making it a necessity. Light to mid throttle at even upper rpms may not be enough demand for the flap to open.

av8or

It's suppose to open at or above 3k.. but when you close the vacuum line, the second intake remains open so you get they "growl" everytime you step on the gas.. no need to wait for 3k

j3ff

​​​​​​
I'm under the same impression also that it's not just rpm alone but engine load and vacuum pressure.

FFM

Exactly, and especially in first gear in which you may not even be under full load with quite a bit into the throttle.

PTYIS2

Ok, but what I believe its happening is for example.... if im at light throttle for example 4000rpms, and i step on it, i believe it will still not open the flap, sounds is not like it has opened the flap.

I was wondering if it got to do with the ECU compensating because i have the AFE drop in air filter instead of the OEM one. I have read posts that said that if you use an after market filter the first days you will see power gains, but after a few days/miles the ECU will compensate and you loose the gains.

My question is then: "how does the ECU compensate to restrict the gain obtained at the beginning? will it be related to the flap, engine ignition timing, other?

JP

flowrider

iTrader: (9)

Folks it has absolutely nothing with engine RPM, ignition timing or any other function, it's vacuum (or lack of vacuum) that actuates the flap.

Lou

FFM

Yup, so load it is then.

PTYIS2

Thanks Lou.

Now... can someone help me understand "how does the ECU compensate to restrict the gains obtained at the beginning when using an aftermarket air filter instead of the OEM? "

flowrider

iTrader: (9)

^^^^AFAIK, it does no such thing. I've been running a Takeda intake with an AFE cone filter for seven years with absolutely no problems. For a year prior to that I ran a JoeZ intake with a K&N filter. I ran the K&N for three months prior to the JoeZ addition. Never experienced any power restriction.

Lou