Turbo compressor wheel question

[And_44]

Yes I have been searching for a bit now but havn't found anything similar. I have a 1990 Talon TSi with the stock 6cm TD05 turbo housing but it has the 16g compressor turbine. Nothing wrong and it works great. Plan on porting the exhaust side to 7cm later. The previous owner told me he did a "Stage 1 turbine upgrade" and just thought he was blowing smoke out his butt. Just took it apart and saw that the compressor wheel had the alternating small big fins. So now wondering.

Questions-

Anyone know the limitations/expectations for this combo?
Is this a common thing (16g wheel in 6cm housing)?

 

[And_44]

Been a while but marked as solved even though I found out LONG ago. It was a small 16g from a Galant. Took the part number on side and did a google search.

 

[snakeyes711]

Word, Can anyone tell me if you gain anything by doing this?

Or tell me if this explains it.

6cm housing=quick spool, lower top end power?
7cm housing=little longer spool time, increased top end power.

That would be my guess, but can anyone confirm that?

Oh, I wouldn't say that would be a "stage 1 upgrade" either. You'd make less power with a 6cm housing if I'm correct, Maybe higher torque but less power. Probably a little hype on the sellers side to get more money if you ask me.

 

[JusMX141]

Plan on porting the exhaust side to 7cm later.

You cannot "port" a 6cm turbine housing into a 7cm turbine housing. It's impossible. What you're saying here would be the same as saying you plan to port your cylinder head into a 2.4.

You can open the mouth of the housing at the inlet a little, but you're not able to open up the volute around the turbine wheel, nor are you able to alter the angle at which the airflow hits the turbine....so at best you'll have a ported 6cm housing.

The previous owner told me he did a "Stage 1 turbine upgrade" and just thought he was blowing smoke out his butt. Just took it apart and saw that the compressor wheel had the alternating small big fins. So now wondering.

Post some pics of the compressor wheel if you can.

 

[And_44]

Snakeyes711- I did notice a difference compared to a T25 on a 2g, the small 16 started boosting a few hundred rpm later and has a taller top end, it also pushes slightly more air.

At about 2500 I had 10psi, never raised boost so had about 3k of nice boost till I shifted at 5500. Was nice, and over last 2 weeks I'm regretting selling car. Never heard of sellers remourse:-(

Sold car so cant post a pic. In my update I said that I found it to be a small 16g off a Galant.

And yes you can port them from what I've read in my searches. If peeps are porting their 14b's with same measurements why not do the same to the s16g it probally won't be 7cm but gasket matched.

Better clarify better on the porting for the moderator. Since it's getting picked apart.

Meant to enlargen the exhaust manifold at the collector to match the gasket of a 7cm turbo then do the same for the intake of the turbo.

Yes the turbo needs directional air to be at peak performance. But through a few searches back when I originally made the post found that the air movng through manifold when it hits the collector is already moving in a direction optimal for turbo perfomance. There are fins inside the collector that direct the air, so when you port and dont grind off these fins your doing nothing to the direction the air is flowing.

 

[JusMX141]

In my update I said that I found it to be a small 16g off a Galant.

Then it should already have had a 7cm turbine housing unless someone dropped the Small 16G CHRA into a 14B's 6cm housing.

And yes you can port them from what I've read in my searches. If peeps are porting their 14b's with same measurements why not do the same to the s16g it probally won't be 7cm but gasket matched.

Better clarify better on the porting for the moderator. Since it's getting picked apart.

Meant to enlargen the exhaust manifold at the collector to match the gasket of a 7cm turbo then do the same for the intake of the turbo.

Yes the turbo needs directional air to be at peak performance. But through a few searches back when I originally made the post found that the air movng through manifold when it hits the collector is already moving in a direction optimal for turbo perfomance. There are fins inside the collector that direct the air, so when you port and dont grind off these fins your doing nothing to the direction the air is flowing.

Looks like I stand corrected.

You can port the top of a 6cm housing as large as you want, you're not changing the size of the volute around the turbine wheel, nor are you changing the angle at which the airflow hits the wheel.

Let me put this in 1st-grader terms- if you have a funnel with an outlet the size of a dime, the funnel's inlet can be 5" in diameter and the funnel will only flow as much as the dime-sized outlet will allow. This is how the 6cm and 7cm housings differ....the volute around the radius of the turbine is cast differently and cannot be changed.

 

[And_44]

A small 16g from the Galant came with a 6cm inlet, dont't have the part number anymore but multiple searchs came up with the same it was a small 16g from a Galant. The reg. and big 16g's were 7cm.

True you can't change the amount of air that goes through the turbine, but you can change the amount of air that hits the turbine decreasing spool time, the wastegate is there to help control that. By porting the exhaust manifold collector outlet and the inlet of the small 16g your increasing the amount of air hitting the turbine making the spool time faster, once it hits the set boost levels the wastegate bypass's the excess air.

Make a long story short the engine puts out so much exhaust to spool our turbos, the wastegate on the turbo is there to bleed off the excess gas. If you increase the area that hits the turbine it spools it faster and when the boost reaches its set value the wastegate opens and bleeds it off. There for porting of the turbo inlet decreases spool time and turbo lag.

The small 16g is a good combo of a 14b spool and a reg/big 16g boost.

But again the part number off turbo and searchs I found it to be a small 16g off a Galant with a 6cm inlet.

 

[big_d]

That's what Justin is saying. You can't increase the area of the volute. "If you increase the area that hits the turbine"... you aren't accomplishing this by gasket matching the surface to 7cm...

 

[JusMX141]

But again the part number off turbo and searchs I found it to be a small 16g off a Galant with a 6cm inlet.

No 16G turbo ever came with a 6cm turbine housing....Small, Big, or Evo III. They all came with 7cm housings from the factory- so if your Small 16G had a 6cm turbine housing, someone removed it from a 14B and put it on the 16G.

 

[And_44]

Holy flaming revival Jusmx161

Jusmx161- Well, kewl. Wonder where you were at almost 8months ago when I originally posted this, the part number off the TD05 turbine housing was from a Galant 16g, but the inlet for the hot side was 6cm so it it was a mixed up turbo that did great, that's what I was originally asking 8months ago but never got an asnswer, it sat for 8months with out a single response

Never said to port the turbine area? Just the inlet.

And using that same 1st grader thinking, If the opening is 5" and the outlet is the same as say a knickle BUT theres a spinning wheel between the two. Then with another hole right before the spinning wheel (wastegate) the size of a dime.

If you increase the size of the dime opening before the spinning wheel and the opening. The area with the spinning wheel doesn't change but the area before does, it increase's the volume hitting the spinning wheel making it spin up faster.

If porting your exhaust components doesn't accomplish anything they why do so many people do it?


Snakeyes711- Actually there was alot done to car (rebuilt head, 3" turboback exhaust, tubular manifold {turned out to be poop}, some new parts, and this turbo hybird), but the previous ownder didn't know why it wasn't starting anymore gave up and had to go to college in a few months so I picked up the car for 1100 and all it needed was a new ECU, tune up, and an oil galley plugged. Got it pretty cheap I think.

Why pick apart what I say? Answer Snakeye711 question. Out of all this I was only one "trying" to answer it. Post sat dead for 8months.

Again RESOLVED and THE END

 

[JusMX141]

Never said to port the turbine area? Just the inlet.

And using that same 1st grader thinking, If the opening is 5" and the outlet is the same as say a knickle BUT theres a spinning wheel between the two. Then with another hole right before the spinning wheel (wastegate) the size of a dime.

If you increase the size of the dime opening before the spinning wheel and the opening. The area with the spinning wheel doesn't change but the area before does, it increase's the volume hitting the spinning wheel making it spin up faster.

You are seriously not thinking about this logically.

By opening up the inlet to the size of a firehose, the only thing you've accomplished is ruining the velocity of the airflow entering the housing.

I don't know what you cannot understand about this....if you have a 3" exhaust system with a 2" muffler, you might as well just say you have a 2" exhaust system because the whole system will be limited to what the muffler will flow. Same is true for this turbine housing scenario....port the inlet as large as you want, it will be limited to whatever the housing itself can flow.

Jusmx161- Well, kewl. Wonder where you were at almost 8months ago when I originally posted this, the part number off the TD05 was from a galant 16g, but the inlet for the hot side was 6cm so it it was a mixed up turbo that did great, that's what I was originally asking 8months ago but never got an asnswer, it sat for 8months with out a single response

Well, And_22, had the thread been started in the appropriate forum instead of a forum aimed toward basic maintenance, perhaps it would have received more positive feedback from knowledgeable members.

CLOSED; USELESS B.S. REMOVED, AND MOVED TO THE APPROPRIATE FORUM.