Hey NZ,
Did you not read my reply
to your other post ?
Go back to Banjo bolt set-up &
see if you've the same problem

 

I am effectively doing that, but not using banjo (dont have one now), will just get the 2 small pipes welded in and hose clamp the lines on.

 

You said it!!!!!!!

 

HEY NZ,
Forgot to tell you. Save your
money. The issue is not with
the BOV not at this boost level.
Like I said, you made too many
mods at one go & it makes it
difficult to debug. But logic tells
me that the culprit has to do
with the elimination of the banjo
bolt. Oh one more thing, makesure
that the ID of the pipe that you're
welding onn is the same size as the
banjo bolt.

 

mwc951, save bandwidth by not posting comments like that please. In fact you never have anything valuable to add, please dont post on my threads if possible. Even if you know the answer to a question I have and I plead for some advice that no one else can offer, dont post. Spend the time you write on my threads on your car. You will be much happier, and so will I.

I had already deleted the banjo, boost was running off the MAP before in a single port config with the stock WG. I think the issue may be a combination of the BOV and boost control. However, the info I have from Link says its not the boost control config but BOV capability. Time will tell.

 

I have to agree that the problem is not likely to be the size of the BOV -- not if it is gobbling at and under 1 bar. I have to think there is something wrong with the way it is plumbed or it is just not working right. Do you have a picture of it?

 

I have had a chat to the guys at link, one helped tune it last night, and he said its the BOV not being able to vent enough pressure fast enough. Good enough for me. It is gobbling under 1 bar, but not as pronounced. It cant be anything else other than the BOV can it?

 

NZ,

If you have a spare stock bypass valve, humor me for a minute and try it in your car. I just have a hard time believing your BOV is not big enough to bleed of 1 bar of boost. Is there any adjustments to make, or springs to shim? Is the 60-1 HiFi brand new? I suppose some turbos may be more sensitive to surge than others.

 

Turbo has 500 miles on it and looks brand new. I have the stock one... I will chuck it in... brb.

 

Ok, let us know what happens. Good luck.

 

"Really? You think that will work? I have been running off the manifold for ages, never noticed this at any stage. I guess the bigger turbo has rooted the crappy LR bov. So you reckon a dual banjo bolt in the IC for both lines, or just one line from there and the other from the manifold?"

NZ,
I wouldn't make any recommendations on connecting a 2-port wastegate, whose characteristics I am not familiar with, but if you only use one port, then I would suggest connecting the valve opening port to the IC pipe.

I actually think that the outlet pipe (just before the throttle plate) would be slightly better, since that eliminates the IC pressure drop, whatever that may be, under high flow (high rpm WOT), which contributes to the typical boost roll off with rpm.

I don't think you'll need a bigger BOV once the part throttle high IC pressure is under control.

If you look at my
pressure data you'll see that even the K26-6 produces an IC pressure of 27 psi for a manifold pressure of 15 psi if the wastegate is closed and if you are using the manifold pressure to open the wastegate at for example 16 psi the turbo has not yet gotten the message to slow down.

Laust

 

Just tested the stock BOV, the compressor surge is much worse than with the LR unit. I am waiting on the Boostguy pipes with the 2 small 4 mm ID pipes to change the bost control. Will get a bigger BOV while I am there, likely a Tial 50mm...

How much time are we talking about between a signal in the IC pipe and one in the manifold?

 

Which lindsey BOV do you have? If tom is bypassing enough CFM that he isn't getting surge supporting 350rwhp w/ a stock valve...then you should have any issues running a Lindsey modded (at 15 psi anyway). BTW how much CFM are we talking about w/ your turbo at 15psi?

Quoted from their site: "Stock BOV @ 28" of water column flows 40.7 CFM
Lindsey BOV @ 28" of water column flows 50.2 CFM, a 25% increase.
We did a little work on the part and maganged to get 55.3 CFM, a 36% increase. This is our modified version."

 

Where are you drawing vacuum for the BOV? If has to come from the head side of the throtlle plate -- i.e., the manifold. (Otherwise, it won't be vacuum until the surge is surged out).

 

Vacum tapped off the fuel dampener which comes from the manifold. When I take off the lines on the manifld banjo servicing boost control, I will use one of those for the BOV dedicated...