Author Topic: Porting and polishing turbo questions (Read 3766 times)

subsonic · « **on:** March 20, 2007, 10:20:08 pm »

OK, so I have been reading up on turbos lately. I have seen the term porting and polishing used more than a few times in regards to turbo enhancments. Took a browse through e-bay and saw some of the same stuff. I have the concept down as to what a P&P is for heads, manifolds etc.. I have not seen the term used for turbos on this forum. Whats your take on this? Are we just talking smoother flow for faster spool, or actually enlarging portions of the turbo housing. Has anyone done this, OR run a turbo that has had this done? Whats the dealio?

Jim

Darkness_is_spreading · « **Reply #1 on:** March 20, 2007, 10:34:30 pm »

Usually to keep the turbo spool characteristics in proportion you do not change the turbo housing. Just port and polish your intake manifold and exhaust manifold, and then Port match the PnP head to the intake and exhaust and you should be good. You wanna limit any drag factor in the intake or exhaust, and exlarge the flow dynamics of the manifold ( more airflow, less restriction). Then run straight pipe by cutting off the muffler and running a piece of 1 1/2 inch pipe diameter to the back of the car.

In my opinion, I would suggest that you leave the turbo alone and go after everything before and after it, close the wastegate or close the line to the wastegate via a valve from Home Depo....

SMOKEYDUB · « **Reply #2 on:** March 20, 2007, 10:44:31 pm »

well yo could clean up the exhaust side. maybe enlarging the inlet side of the turbine will allow the incoming exhaust air to speed up like a venturi effect. polishing really wouldnt do any harm but i dont think you will see any real world power increase. But if i was doing work to one it would be the turbine side. Any one ever heard of clippin some of the exhaust wheels fins? I believe it is just to improve the flow past the turbine wheel itself but i have heard it helps the turbo spool quicker. Anyone have any experience with that?

sethyboy85 · « **Reply #3 on:** March 20, 2007, 10:46:05 pm »

Don't clip a stock turbo, it's not worth it...

Many guys from the 2.2l 8v dodge world would of rather spent the money doing the turbo correctly, some have even posted lost TQ because of clipping the wheel.

subsonic · « **Reply #4 on:** March 20, 2007, 11:33:50 pm »

Most of the stuff I saw online was talking about opening up the intake and exhaust sides of the turbo. Some went further and polished the heck out of everything they could reach it seemed. That exhaust side must get pretty damn hot. I would think it would be kind of sketchy to thin the walls out to much. Would this really help out flow that much? One of the " Performance " shops talked about doing the ceramic coat on the inside of the turbo. Any benefit, in theory anyway? Just curious.

subsonic · « **Reply #5 on:** September 07, 2007, 05:51:17 pm »

This has photos of ported turbo's. What do you think?

http://www.gpopshop.com/portpolish.html