killernoodle

In spirit with my other post in the On3Performance turbo thread, I have disassembled the BOV and wastegate I'm going to be using in my build. The purpose of this thread is to educate people on how these parts are built and what kind of quality to expect. Maybe it will clear up a few myths about Chinese made parts.

First, the wastegate. This is a 38mm unit with vband flanges on both ends. It has a hardened seat that goes between the bottom flange and the vband on the exhaust, but I forgot to grab it when I was taking pictures. The valve is 1pc stainless as well. The diaphragm looks like silicone or something with some sort of fabric mesh woven into it. I'm not a chemist or anything, so I can't be technical about it. It comes with two springs, but I put the lesser spring in there because I'll be using a boost controller on it.

And I realize the pictures suck, I took them on my phone and my room is kinda dark, so it used the flash every time and made every speck of dust look like someone hit the parts with a hammer. I assure you, the fit and finish of everything is better than the pictures indicate.

killernoodle

More pictures.

killernoodle

More pics.

NemeSS

iTrader: (127)

killernoodle

And the BOV. 50mm v band. I have welded it to my charge pipe, which I haven't painted yet, so it looks like crap. Anyway, it looks to have the same sort of diaphragm as the wastegate, it has an O ring in the V band to seal it. It also has a seal on the piston's seat. Everything in here looks pretty nicely made and well thought out too. Machining tolerances are tight.

killernoodle

It was fun trying to put it back together with that huge spring

red281gt

iTrader: (6)

by any chance do u know what the stock springs are good for? like I said I just got mine but dont know what they are good for....

So.jerZ-28

iTrader: (20)

where's all the ebay haters? all I hear is.....

lsxmalibu

iTrader: (50)

My wynton ebay gate looks the same inside...same type of materal....working fine for 2 years.

killernoodle

The thing about wastegate springs, it is not possible to say a spring is a "10 pound spring" or whatever. Exhaust backpressure also plays a role in wastegate cracking pressure some, so there is no way of knowing.

What I do know is, with both springs in, it takes a TON of force to open it by hand. There is a smaller spring and a bigger spring, I used the smaller spring for now since the boost controller needs to be able to open the gate even at light pressure if necessary.

Sarg

iTrader: (6)

I'll tell you what man, I recently got a couple ebay 44mm wastegates just to try them out. They came in the EXACT same box as the Tial 44, same packaging, same everything. They probably are rolled out of the same factory and just have a different name cast in the side. I held both this one and a Tial 44 in my hands and they were virtually identical. I have not taken it apart yet.

killernoodle

You could probably tell the difference if you took them apart. Tial is made in the USA, the ebay one is definitely not. Still though, if the other one functions the exact same as the Tial unit, does it really matter?

SATAN

iTrader: (2)

Just wondering how you know it is hardened?

If I were making anything exhaust related close to the heads, I would not make it out of hardened steel. The exhaust temps get hot enough for parts to start glowing red or even orange in some cases. Then they are slowly allowed to cool by letting the car drive around or idle, then finally cool all the way down by shutting them off.

This is essentially the exact same process to anneal (soften) steel that has been hardened.

That being said, I'm not saying that they are NOT hardened, I just think that would be an odd choice for an exhaust component that certainly has the potential to see very high temps.

Sarg

iTrader: (6)

Maybe, they look to be made out of the same casting minus saying Tial on the side....same exact box, same exact packaging......I will let others draw thier own conclusions. This is not the same as the new water cooled ones, but rather the older v-band 44's.

Orange99Z

iTrader: (25)

As far as I know every head GM has built since '71 has had induction hardened valve seats. It has to do with fuel type and vehicle use eroding the softer material

SATAN

iTrader: (2)

Right, but I think the difference there is that the head is capable of pulling so much heat out of that seat, that it will never get hot enough to be able to anneal. The head just acts as a massive heat sink.

In the case of the waste gate, the manifold gets glowing red (which a valve seat in a head wont do). The heat has nowhere to go, so it can easily make its way into the valve seat on the waste gate, getting it just as hot.

This is just how I am thinking about it though. I may very well be wrong, and I'm alright with that.

So.jerZ-28

iTrader: (20)

whos got a tial that they can take apart to compare the parts?

killernoodle

I got a chance to test the springs in the emusa 38mm wastegate, using a 2nd hand boost gauge and the regulator on my air compressor, this is what I got for when the valve started to crack open:

7lbs - Small diameter spring only
11lbs - Large diameter spring only
18lbs - Both springs

eviltwin_1987

iTrader: (18)

Taking it apart and just looking at it is not going to do anything. Have the material tested to see exactly what it's made of and how strong it is. Do some google searching and you will find thread after thread about Tial copies that look the exact same until the valve snaps and takes out the turbo or motor. Never hear of a Tial w/g or bov doing that

TiAL

that is because they literally copy everything....