Will this stop surge?

[Petrina Polo]

Hi,

We all know about our roller coaster dyno results. This has been shown to be due to wastegate opening/shutting etc etc...

I have seen a thread which talks about restricting flow to the N75. Will this device do the trick?

So if this tap is partially closed will the N75 not have the issue of opening the wastegate erratically due to getting air at the wrong times etc..... delay the effect of opening the wastegate..

My question is as follows

1. how much would you restrict the air to the N75? fully, half etc etc
2. Is flow and pressure a different thing? does this contraption make it unsafe?

[Petrina Polo]

Another photo... the valve is almost shut..

[shaneth]

I think you would probably want a gated boost controller. This blocks the flow of air to the wastegate until a certain psi that you have set. I was thinking of doing this but have decided not to do it. I have one if your interested, pm me.

As to which line you want it on or if it will give you the disired affect I'm not sure as I didn't get that far with my reaserch.

[JCM308]

I think you would probably want a gated boost controller. This blocks the flow of air to the wastegate until a certain psi that you have set. I was thinking of doing this but have decided not to do it.
As to which line you want it on or if it will give you the disired affect I'm not sure as I didn't get that far with my reaserch.

I remember reading somewhere that boost controllers will not work on the Polo's as the boost is controlled by the ECU. Is this true?

[shaneth]

I remember reading somewhere that boost controllers will not work on the Polo's as the boost is controlled by the ECU. Is this true?

Yes you are right. But I wasn't going to use it as a boost controller. Just a way of stopping boost getting to the wastegate so it doesn't bleed early.

[JCM308]

Yes you are right. But I wasn't going to use it as a boost controller. Just a way of stopping boost getting to the wastegate so it doesn't bleed early.

So does this mean the boost level wouldn't increase but boost would stay consistant to redline?

[shaneth]

So does this mean the boost level wouldn't increase but boost would stay consistant to redline?

Well that's the theory behind it. As I said I haven't tried it.

[Ben_GTI]

Just change the internal diameter of the line plumbed back to the TIP. A valve seems dodgy as, balls loosen up over time, or seize up depending on their construction.

Get a solid 50mm length of stainless which you can fit your hose to. Then get the centre bored out, so do some calculations work out your desired flow rate % change and have that size hole bored out. A knife and 2 hose clamps later bob's your uncle.

[shaneth]

I don't see how a valve that is made to do this is dodgy.

[mozzzy_2000]

I hope this aint to far off the thread but since I installed the APR R1 diverter valve I have not experienced any surge since it last happened prior to that install. Must say the performance of the R1 is incredible to say the least.

[mikepologti]

not trying to post to off topic either. but not to sound like a complete spanner, but what exactly does the r1 diverter do that the stock diverter doesnt? is it just build quality?

[shaneth]

TBH Mozzy I have never felt this surging that is mentioned, with a forge dv. It was more of a way to get a little extra power out of the car at the top end but after going phase 2 I don't think I need it. but I thought the valve could help.

[Blitzen]

I have never had any of this surging either...I have refitted my Forge Splitter valve, ans adjusted it properly(since I found that I was the problem, not the valve). I have been told that the stock DV is only good for 9PSI of boost. I don't know how true this is, but testing between the stock, Forge, and another brand DV, I have found that the stock one was bleeding off the boost at about 5000RPM.

[DaveMack]

I have never had any of this surging either...I have refitted my Forge Splitter valve, ans adjusted it properly(since I found that I was the problem, not the valve). I have been told that the stock DV is only good for 9PSI of boost. I don't know how true this is, but testing between the stock, Forge, and another brand DV, I have found that the stock one was bleeding off the boost at about 5000RPM.

Spot on, Ryan. Had the same experience and put in the same DV.

Dave

[h100vw]

not trying to post to off topic either. but not to sound like a complete spanner, but what exactly does the r1 diverter do that the stock diverter doesnt? is it just build quality?

Any replacement DV not just an R1 would be an improvement on the standard plastic one. Better able to handle increased boost.

Most are a piston but the R1 may be a diaphragm I can't remember.

Gavin