Overboost issue post Dawes Valve and catch can fitment.

[wranga]

Hooe this pic works. This valve has 3 ports. One takes boost from intercooler. One is plumbed to the VNT on the turbo. Other is plumbed to a vaccuum chamber about the size of an old distributor coil that is on top of the engine. No plumbing to the boost controller by the air box.

[mudski]

Hooe this pic works. This valve has 3 ports. One takes boost from intercooler.Correct, assuming its the boost side of the controller One is plumbed to the VNT on the turbo.Correct Other is plumbed to a vaccuum chamber about the size of an old distributor coil that is on top of the engine. No plumbing to the boost controller by the air box.Not correct. It should be from the middle port on the vacuum solenoid which is found under the intake pipe, mounted to the air box. That line that goes to the vacuum canister is the vacuum supply line, it should be going to the end port on the vacuum solenoid. Assuming that the HPD controller are plumbed in the same way as the Dawes is. Which I reckon it would be.

That vacuum chamber just by pass that, they do nothing except leak. Nissan got rid of them in around 2002.
Having it plumbed the way it is, you, or the ECU in fact, will have zero control over spool up rate via the vac solenoid. Which it still needs to do as you dont have a needle valve to do this.

[wranga]

Right thanks for all the help and advice guys. Today i have had battery disconnected. Removed MAF and cleaned with contact cleaner. Retrieved and cleared fault codes from ECU one was for MAF and one was for boost issue. Driven a 80km round trip test drive with no overboost issues (was MAF dirty). Retested for fault codes and there are none. Have contacted HPD direct to find a correct plumbing guide from them. Am going to purchase a blank plate and fit and by the sounds i DO need a needle valve from reading what you guys are saying. Where is best place to source a needle valve and plumbing. Cheers for you patience.

[BigRAWesty]

Pretty sure you still need some sorta needle valve with the hpd controller..
The hpd use a 3 port valve where tillix and dawes use simple valves and T joiners..
As for getting a needle valve.. @mudski do you have any left?
If not I know Lindsay from Tillix does sell bits seperatly..

[mudski]

Pretty sure you still need some sorta needle valve with the hpd controller..
The hpd use a 3 port valve where tillix and dawes use simple valves and T joiners..
As for getting a needle valve.. @mudski do you have any left?
If not I know Lindsay from Tillix does sell bits seperatly..

Can't say for the Tillix but the Dawes uses three ports Kallen. One for boost and two for the Vacuum side. If you are to fit a needle valve in then you use another T. And yeah I have plenty of needle valves in stock.....

[BigRAWesty]

Can't say for the Tillix but the Dawes uses three ports Kallen. One for boost and two for the Vacuum side. If you are to fit a needle valve in then you use another T. And yeah I have plenty of needle valves in stock.....

But the actual valve is only 2 ports.. in and out ain't it?

[mudski]

But the actual valve is only 2 ports.. in and out ain't it?

Nope. Three. One boost, two vacuum. As you need to T into the vac supply line to the turbo.

[BigRAWesty]

Ow ok.. the tillix is simple a in out with spring a plunger in it..
Use a T peice to tap it into vac line.. and then a second T to tap in the needle valve..
Im actually seriously considering throwing the stock setup back in but having the tillix to control the over spool..
I don't miss the surging though..

[BigRAWesty]

Nope. Three. One boost, two vacuum. As you need to T into the vac supply line to the turbo.

https://youtu.be/7tQziIey884

[BigRAWesty]

Nope. Three. One boost, two vacuum. As you need to T into the vac supply line to the turbo.

I see what they have done..
Clever..
So yea it's sorta a 2 port valve with inbuilt T..
So the HPD setup is similar again just bigger..
Anyway..
Still need a needle valve..
@mudski what is the quality of the needle valve you have on ebay?
I'm finding the width on my chisel mark is making a difference but then the locking nut affects it too..