Turbo Inlet Pipe (TIP) Comprehensive Thread

[Kei_Loper]

I have the Autotech intake with the CTS TIP. No problems with the fit.

Thanks, you guys just pretty much sold me on picking one up. I remember the enormous gain on the mk4 1.8t, and I noticed that the mk6 and mk7 didn't seem to be so popular with these, but even though it's not a huge gain....it's still something that works, and for very little cost.

Glad this thread exists. ??

Kei

 

[MeatCat]

So the CTS and the Leyo have slightly different connections?
I have stock intake. Would one of these connect to the stock intake easier than the other?

 

[Deviation01]

So the CTS and the Leyo have slightly different connections?
I have stock intake. Would one of these connect to the stock intake easier than the other?

I had the leyo with the stock intake components fit perfectly fine. Here is the install video.

https://youtu.be/lZd4ImJH-aA

 

[teemmy]

Just installed my cts turbo inlet and so far i have some mixed feelings...It does seem like the throttle is more responsive in terms of turbo spooling, however, the increase in cabin noise is a bit too much for my liking...I feel like I'm driving a small diesel engine by the way it sounds

Is anyone else having the problem with significant increase in sounds (not smooth sounding like stock)?

 

[ltktw]

Mst performance 3" turbo inlet kit

 

[TDI Matt]

I love my cts piece, spool noise increased slightly. I would definitely not say it sounds like a diesel.

 

[jacincm]

Wouldn't you need a tune for a mod like this? The ECU is going to see changes in these parameters and will readapt to factory settings to accommodate


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[jacincm]

There's also no substantial evidence that I builds boost at the turbo inlet.

Pressure is built by through a high mass flow rate through a narrow opening. By increasing the diameter of the inlet pipe, you reduce velocity. Bigger isn't always better. It could also create laminar flow conditions which would be the last thing you want.

If people like the sound it makes, that's cool. But I believe people like modding for the sake of modding.


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[ErBall]

There's also no substantial evidence that I builds boost at the turbo inlet.

Pressure is built by through a high mass flow rate through a narrow opening. By increasing the diameter of the inlet pipe, you reduce velocity. Bigger isn't always better. It could also create laminar flow conditions which would be the last thing you want.

If people like the sound it makes, that's cool. But I believe people like modding for the sake of modding.


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Your argument would hold water if this were on the positive pressure side of the system, but it's not. The inlet acts more as a straw than anything else. Volume is more important than velocity.

And no, you don't need a tune to accommodate this at all.

 

[jacincm]

Ahhh gotcha, thanks for the clarification. That makes sense. You want to bring in the most mass of air so it can be compressed into the turbo and create more Boost coming out of the turbo


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[phxvwking]

Velocity is important as well. So is having clean (non turbulent) air entering a compressor. If you drop velocity you increase the risk of reverse flow (compressor stall). That is why when I look at the designs of these TIPs I would never put one on my car. As a aircraft mechanic I have actually had some training on compressor inlet design. I'm no engineer, but I do have a rudimentary grasp on the basic design. My argument was always - look at the companies that actually have some engineering background or staff. The ones that use CFD analysis to design the products they sell. APR, IE etc.. They don't sell these. (well APR does now, https://www.ecstuning.com/b-apr-parts/apr-turbo-inlet-pipe/ms100137~apr/) !! The only ones I have seen that I like are on LOBA and TTE turbos and not sold apart from those turbos.
I DO believe there are gains to be had here, but not at the expense of turbo longevity or cheap, improper design. I'm really glad APR jumped into this, I think this one might actually be one worth getting.

 

[Chowderhead72]

Velocity is important as well. So is having clean (non turbulent) air entering a compressor. If you drop velocity you increase the risk of reverse flow (compressor stall). That is why when I look at the designs of these TIPs I would never put one on my car. As a aircraft mechanic I have actually had some training on compressor inlet design. I'm no engineer, but I do have a rudimentary grasp on the basic design. My argument was always - look at the companies that actually have some engineering background or staff. The ones that use CFD analysis to design the products they sell. APR, IE etc.. They don't sell these. (well APR does now, https://www.ecstuning.com/b-apr-parts/apr-turbo-inlet-pipe/ms100137~apr/) !! The only ones I have seen that I like are on LOBA and TTE turbos and not sold apart from those turbos.
I DO believe there are gains to be had here, but not at the expense of turbo longevity or cheap, improper design. I'm really glad APR jumped into this, I think this one might actually be one worth getting.

So what does the APR version do that the VWR doesn't? Give me a reason to switch.

 

[AtlantaDad]

So what does the APR version do that the VWR doesn't? Give me a reason to switch.

Or CTS, or BMS, or Leyo... Someone's been drinking the kool-aid.

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[phxvwking]

What Kool-aid is this you speak of? I hope you don't think I'm some kind of APR fan-boi. I have never owned any of their products. But I do think they produce some really good ones. With proper research and engineering behind them.
Back on point..
Have you ever seen a CFD (Computational Fluid Dynamics) model of airflow thru a 90 degree bend in a pipe? Its crap! The airflow does not just flow thru the bend, it slams in to the far wall of the pipe creating a high pressure area and starts to tumble. The near side, by the smaller radius of the bend (inside of the elbow) will have a low pressure area. Then all of the aftermarket TIPs I have seen closeup pics of have a reducer or bellmouth to meet up with the turbo inlet. So.. take all of this turbulent, chaotic airflow with different pressures and velocities, cram it thru a reducer and present it to your compressor. Everything I have learned and observed about airflow into a compressor (Axial or centrifugal flow, Turbo, Centrifugal supercharger, APU, ACM Jet engine) is that they, to operate at the highest efficiency, need clean non turbulent high velocity airflow entering them. The average aftermarket 90 degree welded tube elbow can at best provide only a slightly higher volume of air. While throwing out every characteristic that the turbo actually needs to gain it. The factory designed the stock piece with efficiency in mind, and in this case efficiency= performance. We all know how the auto industry chases every ounce of it in their designs. Look at the stock TIP, Its not really a 90 deg bend, its more like 2 45s with a slight curve in the middle and a constantly reducing ID. The compound curve along its length smooth the airflow and the reducing ID keep velocity up. Now look at the APR piece (or the TTE or LOBA ones). Very similar design to the stock piece, keeping all the features the turbo needs to be efficient AND increasing volume (CFM) over the stock piece. So far APR is the only one on the market even worth looking at. Of course all this is IMO... And if anyone with a engineering background wants to correct me, feel free.. I'm always up for learning something new.

 

[Chowderhead72]

Or CTS, or BMS, or Leyo... Someone's been drinking the kool-aid.

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Huh? I have the VWR already I was asking the difference between them. I could care less about the others.. Sorry I TRIGGERED you with my question.