Boost restrictor pill Removal

[Nick Mann]

Alan - it's the same part. Just Mark has got actual pictures of the VR4 solenoid, whereas I would guess that the first post shows a "typical" boost solenoid and restrictor.

All the VR4 solenoids I have seen look just like the one in Marks photos. And as Kat says, the restrictor is normally brass.

[scott.mohekey]

im confused, thats two differnt parts of the car compared with what the firstpost in this thread is talking about.

No, its the same bit. The picture at the top is actually from a GTO.

[AlanDITD]

hmm ok, so on the bulk head theres also two solenoids that look like the first picture, and it definately had a weird blanking pill on it aswell...thats why im confused!

Mark - well done on your beautiful photography skills, i can only aspire!

[MarkSanne]

hahaha thanks Alan, it's a 5/6 years old Sanyo compact digicam which I use as a 'garage-stuff' camera, but it does make pretty pictures despite it's age and all it's simplicity.

[AlanDITD]

hahaha thanks Alan, it's a 5/6 years old Sanyo compact digicam which I use as a 'garage-stuff' camera, but it does make pretty pictures despite it's age and all it's simplicity.

Yeah they are very detailed tbh....pics like yours are far more handy for hobbiest mechanics than any service guide imo. well a combination of the two possibly

[foxdie]

Okay, well, I thought I'd spend some of my bank holiday Monday on seeing if I could remove said pill, I got to the solenoid and both inlet and outlet weren't connected to anything..

I'm guessing that those of us with an Electronic Boost Controller no longer use the stock solenoid, and as such, don't need to remove this pill?

[The Vee]

Yep the whole thing can be bypassed with EBC etc

[Dom B]

The picture in the first post is from a website about tuning a VR4 or rather what the americans call a vr4 which to you and me is a GTO. Anyway the point is that the site is actually very informative and shows lots of dyno testing before and after pill removal etc if i remember rightly. If i can find it again i will post a link.

[Dom B]

I am not sure if this is the website as original i think it is one of the ozvr4 guys.

http://www.rpw.com.au/shop/index.php...urbo-271hp-atw

[horseybusiness]

Just given it a go, after finally managing to drill out the restrictor :-) Good result, my car is def boosting more, getting a sustained 11psi up from around 9 before, no idea why this would happen? I

[phosty]

A bigger hole in the boost pill allows the boost solenoid to vent more pressure from the wastegate actuators thereby allowing more boost.

[Davezj]

so by removing this pill bit does that mean you now can not turn the boost down if you need to.

[phosty]

How do you turn it down now? Do you use an EBC or similar?

[Turbo_Steve]

All the restrictor does is make the boost spike more before settling. Removing it just makes the ECU boost control work worse, spiking all over the place: you'd do far better to just fit an MBC and have the option of going back to standard if you need it.

[Davezj]

took the word out of my mouth Steve.

[jb2815]

All the restrictor does is make the boost spike more before settling. Removing it just makes the ECU boost control work worse, spiking all over the place: you'd do far better to just fit an MBC and have the option of going back to standard if you need it.

hmm I've got a MBC but the solenoid is still plumbed in, should I be taking it out of the equation? The boost controller is one with a seperate T piece (turbosmart copy?)

[Turbo_Steve]

Technically, your boost control will be more stable just using the MBC, however the VR4's boost control seems pretty noddy: I'm not sure it really notices!