No primary boost on RSK?

[wrx_lou]

Mate of mine just bought an RSK. Boosts hard when it hits the secondary but it just doesnt seem to be doing what it should on the primary. Feels like little to no boost at all.

My knowledge on twin turbo is rather limited and I know this is probably a needle in a haystack style question but where do I start looking? It sounds like there may be a boost leak as there is a slight hissing on the passenger side near the bov.

It has a turbosmart bov and and exaust system of some sort (havent really looked).

I have also used the search function but have only returned threads relating to VOD.

[wrx_lou]

So nobody has any idea where to start?

[Joker]

would investigate the leek you think you can hear on passenger/primary side

[wrx_lou]

Reason i havent done already is that I havent really got a clue what im looking at.

I was under the impression that a leak would have the oposite effect and it would be spiking or cutting etc.

Sent from my GT-I9100 using Tapatalk

[Marky]

Quick way to verify the boost side of things - chuck a boost gauge on it first

On factory boost to be honest they feel damn near no-boost to start with at times.

There isn't many places for a leak to create itself - you can see and tighten the clamps from turbo to intercooler from the passengers side, just check the basics - are all hoses plugged in nicely etc.

Try an ECU reset before anything else, mine had defaulted itself to WG pressure for some reason (like 8psi), feels dead flat but still 15-16 on secondary, ECU reset, and a can of engine clean stuff through it and down all the vacuum hoses and it's woken back up, 14-15psi on primary and same on secondary, much more.. happier. If the car thinks there is a problem it may be not enough to go into limp mode, but might still hold boost back.

For the record I left the BOV hose off and went for a drive, actually drove relatively fine apart from me wondering why I had so much BOV flutter haha

[funkytown]

^^ you dont konw what your talking about sorry. 9-11 on the primary is normal.

[Jord]

Does the vacuum piping all look stock? i.e no vac lines leading to nowhere/blocked off?Its not likely but I'm just thinking on the off-chance that someone has had a fiddle with it and converted the system to parallel.

[wrx_lou]

I think so. As I say I'm not really an expert on twin turbo.

The only mod I can see is the plumback hose being blocked due to the atmo venting bov.

I've told him to reset the ecu and see what happens but he hasnt done it yet.

[neodowd]

Tell him to put the factory bov back in, see if that works.

[Guest]

Does he have a boost gauge? I would be checking for cracked lines. Are there any replaced lines which may have been installed with the bov?

[wrx_lou]

Bought it like that. I said that it could be the problem but we have no original to try.

If anyone has one around Rotorua I could try that would be great.

[wrx_lou]

 BigWillieStyles said:

Does he have a boost gauge? I would be checking for cracked lines. Are there any replaced lines which may have been installed with the bov?

Nope and nope. Next thing to do after hes tried the reset.

[Chosimba]

Had a very similar problem with my car when I first got it.

Tried almost everything on the damn thing but turned out to be the black box of Satan had just packed a sad, replaced that and it runs mint now and has been for the last two years.