Weird Boost Issue? Help!?

[inmaniac]

Hey guys,

I have a strange issue with my RB25DET. It seems to have a weird fluttering/wooshing sound when coming on boost, a lot louder than normal. It seems to build and hold boost ok, maybe a little laggier than usual. I'm thinking maybe a boost leak, but here's the spanner in the works: the weird wooshing sound disappears during medium-hard left turns?? How weird is that? Does anyone know what could cause this issue and why it disappears during left turns only???

Any help appreciated. Thanks.

[mad082]

Maybe check your intake pipe. It may have come a bit loose and going round left hand turns is closing a gap that has opened up.

[inmaniac]

Tightened up pretty much all hoses, problem still exists. Do you think this could have anything to do with a malfunctioning BOV? I'm probably way off but whatever...

Anyone?

[inmaniac]

After the sound got worse I eventually found the problem - broken stud where the dump bolts to the turbo, letting a heap of exhaust through the gap. Now I have a worse situation than a boost leak, the stud is broken inside of the turbo exhaust housing and I need some way to get it out...Preferably without removing the turbo >_>

[GH05T]

probably drill it out?

[niZmO_Man]

Pull the turbo off man. Takes about two hours lol.

[SkudR33]

Trust me - I had the same problem last year... Take your turbo out and take it to a thread doctor or machinest... If you do it yourselves I can guarantee you'll ruin it.

Try removing the turbo yourself - if you need help just post on here and I'm sure you'll get plenty of help!

[gotRICE?]

Turbo is actually easier than it looks to come out.

Best advice I can give you is unbolt the dump pipe at the cat and lift it it with the turbo. Makes the job so much quicker lol.

[SkudR33]

And don't be shy with the wd40 - it avoids the whole ruining more bolts scenario... If your in sydney ill try give you a hand!

[mad082]

I'd suggest using something a bit better than wd-40. That shit should be taken off the market

[SkudR33]

Lol what do you suggest? I tend to use wd40 but you need heaps of it.

[mad082]

Get some decent penetrating spray lubricant. There's plenty out there on the market.

[niZmO_Man]

Get some decent penetrating spray lubricant. There's plenty out there on the market.

This interests me. What brands do you suggest? WD40 is easily obtained as it's available in Supermarkets.

[mad082]

There are many brands. Just go into any hardware or auto parts store and see what they sell. Loctite do one, as do many other big brands. We use one at work with graphite in it and it seems to work well (although it's a bit messy). I have a can of stuff somewhere that I got when I was working at an exhaust shop that we used to use there which worked well too. If I can find it I'll post up what it is.

[SkudR33]

Thanks I love learning about little things like that!

[niZmO_Man]

There are many brands. Just go into any hardware or auto parts store and see what they sell. Loctite do one, as do many other big brands. We use one at work with graphite in it and it seems to work well (although it's a bit messy). I have a can of stuff somewhere that I got when I was working at an exhaust shop that we used to use there which worked well too. If I can find it I'll post up what it is.

Thanks for the info.

The thing is, I can go and buy another brand, but if it works just as well as WD40, is there any point in paying more for it (if it costs more)? Hopefully the other brands can provide a stronger product, or one that lubricates better.

The graphite stuff sounds good.

[mad082]

Wd40 is only really a water dispersant and thin oil. It has very little in the way of actual lubricating properties. You can find some friction test videos on YouTube. If you search "friction master wd40" on YouTube there is a 2:36 long video of a test between protecta spray (which I've used and it's pretty good) and wd40. Protecta also have a video on YouTube doing the same test with more oils. I know the guy doing the protecta video and he told me about some other lubes that performed well on the test (almost to the level of protecta), but they didn't show them for obvious reasons. They were bicycle chain lubes though, so not much use for anything else.

Fyi, I am in no way affiliated with protecta.

And using some sort of grease or anti-seize paste when installing things certainly makes life easier in the long run.