APR INTAKE DIY SOUND DOOR

[Twist1]

After having my Apr intake for a couple years I decided to add my own "sound door" like the IE design.

I wanted the sound to be a touch louder but not too loud. It ended up being perfect, and was exactly what I was looking for.

I took just a simple rotary tool and carefully cut these cut outs from the back of the intake. It went through like butter. I then sand papered to clean lines up.

All in all a cool little mod for bored diyers. I think this would apply to really anny intake that you want the sound to increase 30%

 

[Twist1]

I should add: because of the way it is shaped and the size of my cuts, it gives a nice clean higher pitched turbo noise rather than the low and raspy noise of an open intake.

Honestly came out amazing!

 

[ecacafce]

I should add: because of the way it is shaped and the size of my cuts, it gives a nice clean higher pitched turbo noise rather than the low and raspy noise of an open intake.

Honestly came out amazing!

I really want to hear this mod! I want more sound out of my APR intake as well.

 

[Twist1]

I really want to hear this mod! I want more sound out of my APR intake as well.

It sounds perfect. Has a nice clean whistle to it and low rpm shifts sound cool as hell.

 

[ecacafce]

Can you give me some approx measurements of your sound door?

 

[It's Sam]

If you wouldn't mind, could you post a few sound clips? I'd love to hear the difference, since I can barely hear mine.

 

[Twist1]

It's gonna be hard to do but I'll try my best. It's about a 3.5-4" square cut with that IE design of two triangles. Ez to do just be careful

 

[ecacafce]

How did the sound door affect the flow? I know you mentioned it in the FS post but I'm interested to know some #'s

 

[Twist1]

How did the sound door affect the flow? I know you mentioned it in the FS post but I'm interested to know some #'s

According to facebook and mygolfmk7s "flow tests" the apr intake shouldn't be able to support what Im about to do without higher than normal WGDC when compared to my local friends with nearly exact same set up but CTS open intake. If they are similar I am calling BS on APR flowing the worst which I still find hard to believe looking at the design. It just doesn't have very much surface area around the filter. So it's not going to be able to hold as much pressurized air through the system as a whole as compared to an open or bigger inlet intake. But I mean, looking at the design I see what their engineers were getting at. The problem is when people don't open up their grill there is literally no direct route for air to get into the spiral, which was a massive design flaw in terms of instructions. APR should have provided an air scoop like eventuri did and I bet they'd perform the same.

If I find out the CTS actually DOES flow better then APR in real world, on car conditions then yea Im gonna trade em out. None of this is applicable under stage 3+ levels though imho. My is38 set up has lowest duty I think I have ever seen but then again our DA is pretty ridiculous so its hard to compare.

However I AM swapping my APR turbo inlet pipe out for CTS as I absolutely believe that flow tests are relevant for that product and how air flows through it. APR TIP is tiny compared to even CTS. The gradual design for reducing compressor surge is a mute point for me now lol.

 

[ecacafce]

According to facebook and mygolfmk7s "flow tests" the apr intake shouldn't be able to support what Im about to do without higher than normal WGDC when compared to my local friends with nearly exact same set up but CTS open intake. If they are similar I am calling BS on APR flowing the worst which I still find hard to believe looking at the design. It just doesn't have very much surface area around the filter. So it's not going to be able to hold as much pressurized air through the system as a whole as compared to an open or bigger inlet intake. But I mean, looking at the design I see what their engineers were getting at. The problem is when people don't open up their grill there is literally no direct route for air to get into the spiral, which was a massive design flaw in terms of instructions. APR should have provided an air scoop like eventuri did and I bet they'd perform the same.

If I find out the CTS actually DOES flow better then APR in real world, on car conditions then yea Im gonna trade em out. None of this is applicable under stage 3+ levels though imho. My is38 set up has lowest duty I think I have ever seen but then again our DA is pretty ridiculous so its hard to compare.

However I AM swapping my APR turbo inlet pipe out for CTS as I absolutely believe that flow tests are relevant for that product and how air flows through it. APR TIP is tiny compared to even CTS. The gradual design for reducing compressor surge is a mute point for me now lol.

I am tempted grab an ECS inlet scoop to increase flow in to the APR intake. I know some guys were making some DIY scoops but I would rather just go with something a little more polished. I also thought about adding some small circular holes on the side of the intake which faces the drives side wheel.. Not sure that will have any effect though.

Edit: Did some reading.. You make these LOL. Do you still make them??

 

[ecacafce]

After having my Apr intake for a couple years I decided to add my own "sound door" like the IE design.

I wanted the sound to be a touch louder but not too loud. It ended up being perfect, and was exactly what I was looking for.

I took just a simple rotary tool and carefully cut these cut outs from the back of the intake. It went through like butter. I then sand papered to clean lines up.

All in all a cool little mod for bored diyers. I think this would apply to really anny intake that you want the sound to increase 30%

So I cut mine up yesterday but with a different strategy. I wanted to make sure I could cap them if I needed to so I stuck with 1.5" and 1" holes.

Made a difference in sound. I think I will add more on the weekend.

 

[Twist1]

Probably better for air route anyway

 

[MyGolfMk7]

According to facebook and mygolfmk7s "flow tests" the apr intake shouldn't be able to support what Im about to do without higher than normal WGDC when compared to my local friends with nearly exact same set up but CTS open intake. If they are similar I am calling BS on APR flowing the worst which I still find hard to believe looking at the design. It just doesn't have very much surface area around the filter. So it's not going to be able to hold as much pressurized air through the system as a whole as compared to an open or bigger inlet intake. But I mean, looking at the design I see what their engineers were getting at. The problem is when people don't open up their grill there is literally no direct route for air to get into the spiral, which was a massive design flaw in terms of instructions. APR should have provided an air scoop like eventuri did and I bet they'd perform the same.

If I find out the CTS actually DOES flow better then APR in real world, on car conditions then yea Im gonna trade em out. None of this is applicable under stage 3+ levels though imho. My is38 set up has lowest duty I think I have ever seen but then again our DA is pretty ridiculous so its hard to compare.

However I AM swapping my APR turbo inlet pipe out for CTS as I absolutely believe that flow tests are relevant for that product and how air flows through it. APR TIP is tiny compared to even CTS. The gradual design for reducing compressor surge is a mute point for me now lol.

1. You're going to compare the WGDC of two different vehicles and attribute similarity or difference to the airbox? How are you controlling other variables that could affect WGDC?

2. APR has the lowest flow of the 7 aftermarket products tested. Since I have to purchase the majority of products that I test I have incentive to acquire products that have a high likelihood of performing well, because I could be using one for a while. APR was being put up against some of the "best" intakes that I could source.

3. Removing the housing from the APR intake increases airflow through it substantially. I believe the constraint in their design is the channel from the inlet to the filter section, it narrows a bit. The Eventuri that I am presently using has a similar opening but as the width of the intake narrows the height increases. I suspect the cross sectional area of the Eventuri increases along the flow path and the APR intake decreases, before opening into the filter housing.

4. Both the APR and Eventuri intakes were flow tested in the same manner, with the inlet open without any restriction. The scoop is something I've looked into as well and the difference it causes is miniscule, less than one hundredth of a psi during the measurements I made at 50 mph.

5. The flow bench exists in the real world. It's a real device purposefully designed to measure airflow through parts like the intake. The measurement device was calibrated prior to each intake test. The "real world" comparison you are planning is a poorly suited means of evaluating airflow through the APR airbox.

I am tempted grab an ECS inlet scoop to increase flow in to the APR intake. I know some guys were making some DIY scoops but I would rather just go with something a little more polished. I also thought about adding some small circular holes on the side of the intake which faces the drives side wheel.. Not sure that will have any effect though.

Edit: Did some reading.. You make these LOL. Do you still make them??

See above, the scoop does next to nothing.

 

[ecacafce]

1. You're going to compare the WGDC of two different vehicles and attribute similarity or difference to the airbox? How are you controlling other variables that could affect WGDC?

2. APR has the lowest flow of the 7 aftermarket products tested. Since I have to purchase the majority of products that I test I have incentive to acquire products that have a high likelihood of performing well, because I could be using one for a while. APR was being put up against some of the "best" intakes that I could source.

3. Removing the housing from the APR intake increases airflow through it substantially. I believe the constraint in their design is the channel from the inlet to the filter section, it narrows a bit. The Eventuri that I am presently using has a similar opening but as the width of the intake narrows the height increases. I suspect the cross sectional area of the Eventuri increases along the flow path and the APR intake decreases, before opening into the filter housing.

4. Both the APR and Eventuri intakes were flow tested in the same manner, with the inlet open without any restriction. The scoop is something I've looked into as well and the difference it causes is miniscule, less than one hundredth of a psi during the measurements I made at 50 mph.

5. The flow bench exists in the real world. It's a real device purposefully designed to measure airflow through parts like the intake. The measurement device was calibrated prior to each intake test. The "real world" comparison you are planning is a poorly suited means of evaluating airflow through the APR airbox.



See above, the scoop does next to nothing.

Your research has destroyed the resale value of APR intakes lol! Its been fun cutting one up.

 

[Twist1]

I think real world tests are more relevant than a flow bench when it comes to some of the designs like APR or eventuri. They were designed to have moving air on a moving car. Yes the area around the filter is smaller than others which your tests point out. However, one piece that I do agree is comparable to real world results is the TIP testing. Due to how air is moving through that a flow bench is going to show the ones that flow the best. I sold my APR TIP but I just am not sure how an APR intake with my grill sliced open, an air scoop shooting air into it, and the backside cut out is gonna flow like a stock intake lol. I just don't see it.

And no my test is simple: put CTS intake on and log. put APR intake on and log. Same car. Same conditions.

I have no sway one way or the other. I've sold some APR parts just want to see which is best for my TBB dbv2 which just hit 31psi last night with my "stock" flowing intake fine.