remove one tiny part = more KW

[merlin]

just a small point, all the Evos have a parameter that limits boost when engine temp is below a threshold, I'm guessing the VR4 will have the same codeing.

Also, while removing the solenoid restrictor is a good mod, if still running the factory booost control, the ecu will see the system running above its preset target table and attempt to make a correction.
The correction interval is factory set at 1000mS, same as Evos.
I usually reduce this to 300mS on Evos for quicker correction response.
So removing the restrictor will likley only really have benefit in the lower rev range, before the ecu has caught up with events.
The correction table/code is quite aggressive, but can be wound back.

What I have seen is when the restictor is removed, the factory boost control can be tuned to give quite good results, due to the additional air that the BCS can bypass.

 

[VR4legnum98]

Hi Guys..... I'm new to the Leggy world and this thread has caught my attention ...
please forgive me for my ignorance but what is a MBC? , what does it do? any pics to help Identify it.... I would be so greatful
this thread is awesome and I thank you all for the information that you guys give ...
Keep up the good work

 

[pretzil]

Its a manual boost controller, there are bleed, or ball and spring valve type, ball and spring type tend to be more reliable as they aren't affected by temperature, also they will hold all boost until a set level to prevent wastegate creep.

Anyways:
http://www.ebay.com.au/itm/Turbotech-manual-turbo-boost-controller-THE-ORIGINAL
These tend to be the cheapest and best, its what I've got anyway.

Installation is a cinch, http://www.ozvr4.com/threads/how-to-fit-a-manual-boost-controller.908/

 

[VR4legnum98]

Thanks Rick , great info , helps alot .... going to look into it
this should be intresting

 

[jAY jAY]

Would you need 2 MBC's as there are 2 wastegates? or can you just use the one on the turbo in the upper rear of the engine (next to intake manifold) that connects to the wastegate solenoid?

 

[pretzil]

Nope, there is a T-Piece, just 1 MBC on the red tipped hose coming from the intake elbow.

 

[Gt_Galant]

^^^ Rick is correct

here's a link explaining how (scroll through the thread you'll most likely find pictures show you how)

http://www.ozvr4.com/threads/how-to-fit-a-manual-boost-controller.908/

 

[REI600]

So... as there might very well have been links in here and "how-tos", them links is dead.

Any chance someone on here is able to revisit the idea and tell us newer members the meat and vege of how to go about this?

I'm sure I wouldn't be the only one to appreciate it.

 

[TME_Steve]

Get it tuned with a 3 port. Tuner should be able to fit the 3 port while you're at it

 

[REI600]

1 - whats 3 port tuned mean?

and.....

2 - in Rockhampton? Thats a bit ambitious for this little place mate

 

[Vstar_83]

1 - whats 3 port tuned mean?

and.....

2 - in Rockhampton? Thats a bit ambitious for this little place mate

A three port tune,is just a tune with the three port solenoid instead of the single solenoid.

 

[zac billetski]

i have a copy of a writeup that im currently using to install my EBC. if that interests anyone ill find it and attach it.

i didn't write it, but it used to be posted on club vr4, may well still be there for all i know.