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

[@jeferainman2990]

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

[@WT4T]

Much appreciated!

[@mrgusss3224]

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

[@yalitorres3723]

When can we see what is this part

[@racedynamix]

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

[@WT4T]

Just plugging away!

[@chrischarles9218]

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

[@WT4T]

Yeah, I was shocked the difference

[@chrischarles9218]

@@WT4T Mr. Perrin let you reveal yet?

[@WT4T]

@chrischarles9218 nope

[@VBmike2100]

@@WT4Twhen!? lol

[@ITZAWRAP_AU]

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

[@WT4T]

I'm super interested in why anyone would need or want a plumb back diverter valve when the factory one isn't known to leak or fail and is ecu controlled.

[@ITZAWRAP_AU]

@WT4T I personally changed it because the standard one drags when coming off boost and has a terrible noise when doing so with a air intake

[@Kasperght]

Will you update your video and tell us what that prototype part is when you are allowed to? I'm very interested in parts that are focused on longevity of the car.

[@WT4T]

If it ever gets released 😭

[@SubySlider17]

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

[@WT4T]

I'm not sure how that would pick up power but interested to see.

[@SubySlider17]

@@WT4T yea just a guess, you seemed surprised in picking up power. Looking forward to seeing what it is when Perrin gives the go ahead. Cool video!

[@WT4T]

@TheSubyslider17 🧐

[@Antykain]

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

[@brian6speed]

diverter valve

[@Antykain]

@@brian6speed Nah.. He already said it wasn't the diverter valve in another post.

[@WT4T]

Not a diverter valve.

[@JSTwizzy]

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

[@WT4T]

Probably pretty negligible

[@EricMixon]

Was it a PCV valve? It’s the right size and in the right area and not something you would expect to improve performance, but I saw Radium makes one that they claim is better than a normal PCV valve so I guess there’s room to iterate? Since it’s an emissions thing I could see why they didn’t move forward with it, due to CARB.

[@WT4T]

Not pcv 🫣

[@bryanheredia3374]

Does this turbo inlet require a tune after install ?

[@WT4T]

Not on our maps, but I can't speak for others or stock.

[@Swaggie-Dee]

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

[@WT4T]

You're just in time, but alas, it was not a map sensor.

[@Turbobrahhh]

so can i get an etune from you or Clark tunner etc as i add things

[@WT4T]

Yes sir, we can get you taken care of! I can't speak for Clark as we're not associated with them.

[@Turbobrahhh]

@@WT4T used i it as an example i meant if i get a tune from you and i had a few things added after is that covered

[@WT4T]

@Turbobrahhh like all things time is money but it's not a full retune fee, just depends what changes are needed. This is pretty standard across the industry.

[@Turbobrahhh]

@@WT4T yeah I gotcha that's why I'm picking an choosing my directiot

[@JordieG8]

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.

[@WT4T]

Negative

[@JordieG8]

@@WT4T come one man, I like your channel, give me more than that! Lol Edit: oh, you meant Negative to the diverter valve. It was worth the guess.

[@WT4T]

Perrin has a fix for this, which is the lines I put up top on the car 🤗 Yes, the "negative" was for the diverter valve comment.

[@JordieG8]

@@WT4T I’m not sure if they can fix the deletion of the venturi, there needs to be a decent vacuum source to keep the crank case under vacuum. When the manifold is transitioning to positive and the inlet pipe isn’t flowing enough to generate a decent depression. A mechanical vacuum source or venturi would be the only way. Personally, I just wouldn’t want to give up the benefits of having solid crank case vacuum for the limited benefits of not having it. It’s actually a clever solution. Moving to a venture style PCV system on gen 3 E888’s has basically eliminated oil consumption on track and helps to mitigate PCV issues when running larger intakes. In my testing of my own venturi system, it takes about 10g/s of airflow at 29PSi. The wastegate PID hardly has to do anything.

[@WT4T]

@JordieG8 interesting. Now I'm curious, I'd like to measure how much vacuum it actually draws vs the solution Jeff came up with.

[@arielperalta1641]

Are you able to dosclose the prototype part yet?

[@WT4T]

I don't believe so 🫢

[@yankpr1]

10 months later what was the part

[@WT4T]

Still cannot disclose

[@carbon9652]

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

[@WT4T]

Nope. Zero interest in aftermarket diverter valves.

[@carbon9652]

scratch that seeing where is being installed is a Perrin EGR

[@aaronbryan5095]

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?

[@WT4T]

They're using it to pull a little vacuum on the evap system and I do mean A LITTLE.

[@aaronbryan5095]

@@WT4T that's the strangest way of implementing this that I've ever seen from the factory 😂

[@WT4T]

@aaronbryan5095 yes sir. #engineering

[@VBmike2100]

@@WT4Tso if there’s no vacuum for evap isn’t that a bad thing?

[@Kopernicus67]

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.

[@WT4T]

The turbo connection is billet aluminum but the tube itself is wire reinforced Silicon. Pretty standard in the industry. You don't need much to "clamp onto" because the part carries no load.

[@Kopernicus67]

Thanks for the clarification. Still don't like the coolant line, rather than zip tie, I'd shorten the coolant line altogether farther up in the engine bay, @@WT4T

[@WT4T]

@Kopernicus67 I agree there but I left it alone so I can go back easier later.

[@Chris05STi1982]

Ahhh Perrint prototype EGR!!?

[@WT4T]

Not sure what that is or how it would make power.

[@Nom_Nomzzz]

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

[@WT4T]

Probably 5-10hp more on 92oct

[@pauletecelebradocusi3555]

What was the part?

[@WT4T]

Sadly still cannot divulge 😪

[@pauletecelebradocusi3555]

Lol damn! That’s a long time. I watched this video like 3-4 mo ago. Finally about to put the inlet on next week

[@WT4T]

@pauletecelebradocusi3555 yeah. I think they shelved it due to epa stuff

[@pauletecelebradocusi3555]

@@WT4T I noticed you didn’t have to take the top mount off for the inlet. Was it hard to get back there and insert that little piece

[@WT4T]

@pauletecelebradocusi3555 no, it wasn't hard at all

[@matthewwain9958]

@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 :) )

[@WT4T]

I wouldn't use any mods at all really on a stock untuned car because there's no closed loop fuel control at WOT on the stock map. Basically any tune even like the ots Cobb maps or my maps adds closed loop control and the inlet is fine on those.

[@matthewwain9958]

@@WT4T perfect. Thank you!

[@chewy6367]

Mystery part a DV ?

[@WT4T]

DV?

[@chewy6367]

@@WT4Tdiverter valve sorry.

[@WT4T]

Oh, no, no reason for one. Factory is fine

[@chewy6367]

@@WT4T great videos, very informative.

[@WT4T]

Thanks, many more to come on this platform!

[@ironmandingo1]

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

[@WT4T]

Definitely not more than 3k.

[@ironmandingo1]

@@WT4T thanks man. I might get that turbo inlet to run with my e40 tune since it doesn’t need any type of tune

[@WT4T]

I can't promise that for everyones OTS maps, but ours run it great.

[@ironmandingo1]

@@WT4T ok. I’ll get with the tuner and ask if it’s ok to run it. Great talking to you

[@WT4T]

@ironmandingo1 it's ALWAYS a good idea to consult your tuner before changing parts. They know better than anyone in the industry what works and what doesn't.

[@0Camus0]

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]

I do a series of 3-5 runs for every "test". As for environmental conditions all runs are same day as close together as possible and weather corrected using a weather station in the room.

[@0Camus0]

@@WT4T My apologies! Perfect, then the change is significative and not noise. I wasn't expecting such an increase without re calibration.

[@WT4T]

@0Camus0 me either!

[@boostedproblems5139]

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

[@WT4T]

I wouldn't say "always" scan tools can't make up their mind and neither can service manuals

[@chads7796]

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?

[@WT4T]

😏 maybe. I do have quite large hands. It could have had hardware.

[@chads7796]

lol you are good. Well the bag was fairly small so only so many things can fit. You installed on the dyno so it must have been quick/easy. All I know is I want one and have a Perrin turbo inlet, Perrin mBPV and a few other non essential bits to add and a retune (currently dynoed at 354whp/356wtq on 93 Drunkmann tuned at Felix Performance). Wonder when Perrin will release this?? I will probably wait for it for a retune.

[@djdigdugg]

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

[@WT4T]

Sure 🤷‍♂️

[@renob98362]

Perrin? Like the T-shirt company?

[@WT4T]

They do sell t-shirts, but they've been making car parts for at least 20 years.

[@blkstang4830]

A shiny new oil cap 😂

[@WT4T]

You'd probably be able to see that in the video after the install.... but... 🤷‍♂️

[@M0NST3RIAMP3D]

Imma guess it’s a throttle spacer 😅

[@chrischarles9218]

@@M0NST3RIAMP3D That is what I was thinking when I saw him take off the inter cooler. Some type of spacer that separates the heat from the throttle body to the intercooler... just spit balling here..

[@woodzy575]

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

[@WT4T]

Zero that's ever worth anything. I tested them a while back on brz and zero real gain with tons of issues.