Ok, so I've been one of those who was never a fan of hot, moist and dirty (ooo errr) crankcase vapour being the only means of lubrication for the charger, so I intend on carrying out the boost return mod at some stage.
However, I want to dampen the sound as much as possible and I don't really want to remove the charcoal canister and purge valve etc to achieve this. Main reason really is I want it mostly to remain as factory as possible.
So, my idea is this - what if I remove the short length of hose from the rocker cover to the charger return, blank the return and run a new hose away relatively discretely from the rocker cover an down towards the slam panel into a catch tank.
Does that sound reasonable? My only concern really is the release pressure from the charger having to expel into the catch tank. May make a mess? My hope is this will cause minimal modification, but also dampen the noise?
Chris.
Surely you'd be better off running the boost return hose and blanking the inlet for the oil breather hose. Then run the oil breather to the catch tank.
plug breather hose at the bottom and run breather to a catch tank. (hidden)
Get a new (second hand) hose from rocker to charger. cut the bottom ridge off and put holes in the bottom of it. Then make a blanking plate same size as where it attaches to charger amd put it under the hose.
looks factory..... boost return
Hang on, but then where does the excess boost pressure go? I have become confused :P
excess pressure goes out the holes in the bottom of the rocker to charger hose.
Ah yes, makes perfect sense!
Cheers
The induction noise is still going to be largely increased too its just the dump valve noise that will be muffled slightly, you'd most likely still hear it.
This is what you mean?
(http://farm5.static.flickr.com/4107/5172547976_124d19ed8d_z.jpg)
Stop showing that under-bonnet shot Alex. It makes me feel inadequate.
Quote from: scotsjohn on February 26, 2012, 04:51:47 PM
Stop showing that under-bonnet shot Alex. It makes me feel inadequate.
It doesn't make me feel any better seeing as though it isn't there anymore.
Looks stock to me, Alex! So did you do what Pete described?
I had a blank at the charger end of the return pipe from the cover. I blanked off the breather pipe where it goes into the return elbow. Then I put a new length of pipe about 1.5 inches in diameter in to the elbow right on the corner after the tb and ran it down the back of the engine about a foot. Then fitted catch tank as normal. You can still hear the return but it's quiet compared to all the others I've heard and it looks stock.