B16g turbin housing is an upgrade to the e316g housing?

[PieEyedPiper]

eBay Motors: Ported Evo 3 16g Turbo w/ Big 16g Turbine Housing 4g63 (item 260239589039 end time May-18-08 19:27:36 PDT)

I was just cruising the bay when I saw a peculiar piece of info that I'd not come across before.
I find that hard to swallow, does anyone know anything about that?
I'd have just guessed they were near identical apart from exterior casting and nickel content.

 

[T9S1i]

well the only reason its an upgrade is because its ported. However, it doesnt even look ported by the pictures...The description says the step is removed, but its not in the picture.

 

[rich3389]

I was always under the impression that the evo3 housing was supposed to be "better" than a regular big 16g housing.

 

[architechnik]

The EVO3 16g is comparable to a ported big 16g with better flow characteristics. It comes with the larger housing outlet and shouldn't require any porting unless it was based off the small 16g. Compare these pages
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Mitsubishi TD05H "Big" 16G
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Mitsubishi TD05H "EVO III Big" 16G

EDIT: There is information on the site you posted that states the step is ported. The step is to hold a ring that ensures alignment between the manifold and turbo, although most people do not have this metal ring installed. Therefore, the inlet flow would be better than a stock E3 housing, assuming the manifold and gasket match.

 

[PieEyedPiper]

I did not see anything that indicated that the turbine housing was better because it had a shiesty port job. And even if there were I'd simply consider that a misrepresentation/poor use of language.
I'm just wondering if there was any support to a rather unique claim. As I thought, it seems not.

 

[architechnik]

There is a benefit to doing what they are stating they did, if it were done properly. The problem is that it likely was not done properly and it's not really worth the money. Some suspicion arises from the statement implying that it is a hybrid of a Big 16g and Evo3. Further down the auction it specifies that it is just a ported exhaust housing on a typical E3

If you notice, none of the pictures provide angles that show any of the porting of the WG or outlet. This should raise a red flag for anyone thinking of purchasing a hack job like this suggests.

 

[PieEyedPiper]

There is a benefit to doing what they are stating they did, if it were done properly. The problem is that it likely was not done properly and it's not really worth the money. Some suspicion arises from the statement implying that it is a hybrid of a Big 16g and Evo3. Further down the auction it specifies that it is just a ported exhaust housing on a typical E3

If you notice, none of the pictures provide angles that show any of the porting of the WG or outlet. This should raise a red flag for anyone thinking of purchasing a hack job like this suggests.

Yes yes, we all know porting has benefits. And how a bad port job is just that, bad.
The item, indeed, does appear to be using a b16g turbine housing though, and is not a typical E3.

..assuming of course that the compressor side is an E3 and not the matching half of that b16g turbine housing...

The auction also mentions the turbine itself flowing more?

Again, I think this is all just poorly chosen language on behalf of the auction holder.

 

[romeen]

The B16G has thicker walls at the turbine inlet which can allow for more porting. The thinner walls of the EVO 3 16G will allow only so much porting before getting too thin but it does make it about 2 lbs lighter.

In the pics it looks like the step has only been partially ported.

 

[webconnect]

I myself would never buy from a person with only 2 transactions .

 

[Boosted98gsx]

The volutes between the e3 turbine and the standard big16g turbine are the same. The evo3 has less material and is made from a higher nickel alloy making it more resilient to cracking, and lighter. The outlet of the evo3 has a larger bore diameter on the exit making a smoother transition from the turbine to a big exhaust due to this taper. The evo3 also comes with a 34mm flapper if I am not mistaken, so no need to upgrade to resist creep.

 

[PieEyedPiper]

The volutes between the e3 turbine and the standard big16g turbine are the same. The evo3 has less material and is made from a higher nickel alloy making it more resilient to cracking, and lighter. The outlet of the evo3 has a larger bore diameter on the exit making a smoother transition from the turbine to a big exhaust due to this taper. The evo3 also comes with a 34mm flapper if I am not mistaken, so no need to upgrade to resist creep.

I don't think it comes with a 34mm flapper. Its just a popular mod people have done when they purchase the units form FP or the like. Problem with a large flapper is it can prevent you from running high boost.

 

[90laserRSfwd]

Problem with a large flapper is it can prevent you from running high boost.

Care to elaborate on that?

 

[architechnik]

A larger flapper usually means a ported exit and with a larger volume of exhaust that can go through. This means the WG actuator needs to be able to hold the pressure of the additional exhaust that is trying to go through. It's a matter of rotational force (torque) being converted to the flapper lever and then through the arm to actuator. There is a additional information in one of the posts on here, but it is a known potential problem for waste gate actuators that do not have enough internal force.

 

[Boosted98gsx]

A larger flapper usually means a ported exit and with a larger volume of exhaust that can go through. This means the WG actuator needs to be able to hold the pressure of the additional exhaust that is trying to go through. It's a matter of rotational force (torque) being converted to the flapper lever and then through the arm to actuator. There is a additional information in one of the posts on here, but it is a known potential problem for waste gate actuators that do not have enough internal force.

This is also why on large external gates, you want to get a spring combination as close to the boost level as you want to run. The larger the surface area of the plunger, the more force acting upon it by the back pressure in the exhaust. If you try to run a boost level too far from your spring rate, the gate will simply be overrun by said exhaust pressure and maximum boost levels will be hindered.