Subaru VB WRX: Perrin Turbo Inlet & Secret Prototype Part vs Stock Inlet Dyno Power Showdown 

You are the channel I was hoping to find. I like evidence and that is what you bring. Thank you very much.

You are awesome. I had so many questions and you answered a ton of them.

Pretty awesome to see the results on the Perrin Turbo Inlet. Have you been able to disclose the info on the prototype part yet? 🤔

It’s a diverter valve. Also, the removal of the PCV system venturi is stupid. It’s there for a reason, and that’s to keep the crankcase under vacuum during transient conditions. This is even more vital when running larger factory intakes / Inlet pipes due to the reduced depressions in them. It’s not a “boost leak” like Perrin calls it, it’s simply a recirculation from the outlet side to the inlet side of the turbo. A large portion of the energy lost is recovered because it increases the pressure on the inlet side which helps to decrease the pressure ratio of the turbo. Even if it causes a 5-10HP loss, it’s worth it to keep the crank case under vacuum. VAG has been using this system on different versions of the EA888 and for those without it, you’re starting to see people retrofit the venturi.

When can we see what is this part

That turbo inlet is a must on any tuned VB. Great video! I'm dying to know what that part is now.

Great video content, great explanations on the testing.. and congrats on 2k subs 👌

Be super keen to see you test the turbosmart plumb back diverter valve

Removed TMIC for mystery prototype part and others have guessed Diverter Valve... I am guessing an updated EGR valve then hmmm... Awesome to see gains from both the inlet and mystery part

Im late to the party but the proto type part is a 4bar map sensor

are you running a stage 2 on that tune prior to install?

I really enjoy the content . Do you think its worth it to remove the coolant lines from the oem inlet to lower intake temps? Would it be negligible and might as well do whole inlet replacement

You cannot complain about the power increase. However, I just don't like how flimsy it looks compared to the factory part, especially the dangling coolant line. The original part was a solid (I'm assuming aluminum) block with a lip to accept the intake tube, the Perrin inlet just looks like a wide flimsy tube held onto the intake tube and turbo with not much for the hose clamps to reliably grab onto. I dunno, correct me if I'm seeing this wrong.

Ahhh Perrint prototype EGR!!?

I wonder why the stock turbo and turbo inlet pipe has that weird path that allows for boost leak to happen. Is Subaru using it as an unusual way to hold back power at high rpm?

Does this turbo inlet require a tune after install ?

Are you able to dosclose the prototype part yet?

Left & right is always from sitting in the drivers seat same for usdm and jdm

Just as devil's advocate, how much of these could be only noise from run to run? Humidity, ambient temperature, initial IAT, etc? Seems to me ~3 whp is just variance, isn't? More than 5 maybe is significant? Thanks, great content!

@WT4T Any info on what the prototype part is yet? Second question.. does the turbo inlet need a tune, or can it be used safely on a stock car? (From a research paper : Effect of EGR jet position on gasoline performance and NOx emission :) )

is the Perrin Diverter Valve been waiting a minute to get my hands on it.

Was this an eye spy? You missed a spot :D

Hmm improves driveabilty, smaller part, no bolts just the part, part # is psp-eng-250. I know it is engine….made a little more power. Throttle Body Spacer?

I wonder how much power it will make when its tuned for these mods.

im running an e40 ots map. how often do you think i should change my oil? i know it loses viscosity early. i have the 22 wrx

A shiny new oil cap 😂

Perrin? Like the T-shirt company?

Mystery part a DV ?

I wonder how much power you can get from a lightweight crank pulley? nevermind, you can't fit a pulley in you hand. probably an egr jet or a spring