The woes of the 'new' Liberty

Bodge · Post by **Bodge** » Wed Oct 06, 2010 9:00 pm

The kid in me is over the moon with the Liberty wagon, but it does come with a small amount of baggage.

Firstly it isn't impressing me with it's awesomeness powerwise as of yet.

It came with a non-functioning boost gauge and I had no idea what it was producing, so I replaced it and turns out boost peaks at a flat 5 PSI. (I think it hit the heady heights of 7 PSI once when I was trying in vain for the manual boost controller to control anything). Assuming that this low boost was the reason for the ordinary performance, I wound out the controller some. This first adjustment did squat so I played more and eventually wound it right out and then right in with no change in max boost pressure.

I'm not sure if the controller is plumbed up backwards or to the wrong vacuum line? Maybe the vacuum lines are incorrectly plumbed to start with? I did see two vacuum 'ports' without a vacuum line on 'em!

Also why would it need a manual controller when it has a VOS chip? I thought the chip covered boost control?

There is more but I'll post them in new threads for clarity.
Any ideas on what the is going on here?
Cheers

Gannon · Post by **Gannon** » Wed Oct 06, 2010 9:31 pm

Can you give us more information to work with please

Assuming its an RS or converted Liberty with an EJ20 of some sort, but is it an RS, WRX or STI engine?
Turbo?
Modifications like intercooler, intake and exhaust?

An engine bay pic always helps.

Id disconnect the manual boost controller and use just the factory solenoid if it has a VosChip.

This should help you check the hose connections

There should be a brass restrictor pill in the bottom hose.

Bodge · Post by **Bodge** » Thu Oct 07, 2010 6:51 pm

Thanks for the pic, I would have had to guess if that wasn't there.
Especially mentioning the reducer in line, I didn't have a clue why a loose vacuum line had a joiner in it, glad to know it's needed.
Cheers.

d_generate · Post by **d_generate** » Fri Oct 08, 2010 12:49 am

I think the restrictor pill is on the passenger side of the turbo on a small L shaped vacuum line that attaches directly to the turbo, it won't boost past about 6psi without it, that's where it is on most Subi's that I've seen.