Intake silencer removal
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Originally posted by Arcanum
My car will be needing to hit the dealership in about 2 months for a checkup/oil change. So I thought I could get the part # and have it waiting for me there.
My car will be needing to hit the dealership in about 2 months for a checkup/oil change. So I thought I could get the part # and have it waiting for me there.
I don't have the part number or anything but I did manage to 'find' one of those caps for my WRX
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I got tired of it and put mine back in. It was takeing up space in my room. 
And my HKS BOV takes care of that "cool" sound. And if you want your BOV to sound even LOUDER in the cabin just remove the firewall plug behind the clutch pedal. (blue ej20) told me this and it works, but your feet get cold
And my HKS BOV takes care of that "cool" sound. And if you want your BOV to sound even LOUDER in the cabin just remove the firewall plug behind the clutch pedal. (blue ej20) told me this and it works, but your feet get cold
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iTrader: (2)
Joined: Nov 2002
Posts: 15,425
From: Under your bed, in your closet, and in your head
Car Info: Corvette Z51
Originally posted by Arcanum
IMHO, Shiv seems to be a good guy. I have no personal experience with him, but how could you prove a 1HP loss? I've seen dyno runs of the same car back to back show differences of 5 HP.
/\rcanum
IMHO, Shiv seems to be a good guy. I have no personal experience with him, but how could you prove a 1HP loss? I've seen dyno runs of the same car back to back show differences of 5 HP.
/\rcanum
the firewall thing that nevz was talking about works. i used that to route my boost line to the TT, and after that i heard the turbo much louder. i left the plug in, but i taped it on, so it wouldnt fall out. if you do decide to take it out watch out for it, dont let it fall out, itll be a ***** to fish it out.
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Where else does it draw air from?
I would imagine it would suck air from the holes in the bumper cover. When you block off that large hole it will have to suck more air thru the same holes in the bumper. Therefore it will create more of a vaccuum and could possibly draw in water if you drive thru a puddle under throttle.
At least thats my guess.
~v6
I would imagine it would suck air from the holes in the bumper cover. When you block off that large hole it will have to suck more air thru the same holes in the bumper. Therefore it will create more of a vaccuum and could possibly draw in water if you drive thru a puddle under throttle.
At least thats my guess.
~v6
Registered User
Joined: Nov 2002
Posts: 72
From: Calgary, Alberta, Canada
Car Info: 02 WRB WRX
Intake Silencer Testing
Myself and another member did some Delta Dash testing of the intake silencer mod. We tested three scenarios:
1. Stock intake
2. Silencer removed
3. Silencer removed and dryer hose to connect airbox to scoop
All testing was conducted on the same day on an otherwise stock WRX. Results shown are for three WOT runs up to 4th gear. #3 run was cut off due to police presence.
In the attached pictures/files I will show three charts:
MAF vs MPH
MAF vs RPM
MAF vs Time
JC
1. Stock intake
2. Silencer removed
3. Silencer removed and dryer hose to connect airbox to scoop
All testing was conducted on the same day on an otherwise stock WRX. Results shown are for three WOT runs up to 4th gear. #3 run was cut off due to police presence.
In the attached pictures/files I will show three charts:
MAF vs MPH
MAF vs RPM
MAF vs Time
JC
Registered User
Joined: Nov 2002
Posts: 72
From: Calgary, Alberta, Canada
Car Info: 02 WRB WRX
MAF vs MPH
This chart clearly shows that MAF is highest for all MPH ranges with the stock intake. This indicates that a "ram air" effect is occurring at higher vehicle speeds due to the ram air effect in the front of the car. Note that this is good.
Caution - this chart does not take into account RPM yet and thus, these results seem to indicate an obvious advantage for the stock setup at this point...
Caution - this chart does not take into account RPM yet and thus, these results seem to indicate an obvious advantage for the stock setup at this point...
Registered User
Joined: Nov 2002
Posts: 72
From: Calgary, Alberta, Canada
Car Info: 02 WRB WRX
MAF vs RPM
This chart clearly shows that MAF is better for the modded intake silencer but starts to fall behind in the upper revs. Nontheless, its not so much worse in the upper RPM ranges that it offsets the obvious gains obtained in the lower RPM ranges.
Also note the significant amount of scattering of the data in the stock setup. This shows that the intake silencer mod provides much smoother airflow due to decreases in turbulence in the intake.
Also note the significant amount of scattering of the data in the stock setup. This shows that the intake silencer mod provides much smoother airflow due to decreases in turbulence in the intake.
Registered User
Joined: Nov 2002
Posts: 72
From: Calgary, Alberta, Canada
Car Info: 02 WRB WRX
Conclusions
So, as you can see from the attached graphs, the stock setup seems to be better than the others in the upper RPM's and the silencer mod results in low end gains. I also did a statistical analysis (multiple linear regression) using MAF, MPH, RPM and IAT and the MAF reading seems to correlate well with MPH and RPM, but not IAT.
So, based on what I see in this chart, there is either some "ram air" effects from the stock intake or it is accessing colder air at high RPM/MPH (most likely the former). Note that the MAF takes into account air velocity and temperature to be able to calculate the "mass of air" entering the engine. Of course, the more air you can get in, the more power you are going to make.
My experience with the silencer mod (I currently have the hacked version) was that it provided increased smoothness and low-end gains. These charts support my hypotheses based on the 'ol butt dyno.
JC
So, based on what I see in this chart, there is either some "ram air" effects from the stock intake or it is accessing colder air at high RPM/MPH (most likely the former). Note that the MAF takes into account air velocity and temperature to be able to calculate the "mass of air" entering the engine. Of course, the more air you can get in, the more power you are going to make.
My experience with the silencer mod (I currently have the hacked version) was that it provided increased smoothness and low-end gains. These charts support my hypotheses based on the 'ol butt dyno.
JC
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Originally posted by V6turboTA
I feel that if you put that plastic cover on the new hole in the fender well you will increase your chance of sucking up water into the filter.
I feel that if you put that plastic cover on the new hole in the fender well you will increase your chance of sucking up water into the filter.
I could be wrong but I don't think under normal conditions water should be a problem.
I had a hybrid Civic and was running a cold air intake with the cone filter mounted directly behind one of the fog light cut outs (with no fog light). The car was pretty low, I live in Vancouver (rainy winters like Seattle) and never had any problems.
Maybe somebody can chip in with a water on filter hydrolocking disaster story for us. I personally have never heard one.