whats up guys. i was wondering if anyone ever thought of Extrude Honing a compressor cover OR a turbine housing?? the compressor cover only for a smoother air flow and the turbine for a bit of a ported and also smoother air flow. it actually would not be hard to test either and if someone is willing to do it i can donate a hta86 cover, reg 35r cover ''anti surge'' , or a reg 35r cover. i dont have exhaust housings though. well i do but there TS.

 

Just get them ported. Cheaper and more effective.

 

extrude honing a turbo can be very beneficial depending on the turbo. It removes a lot a material. In affect it makes the a/r larger. If a larger a/r will help that turbo then yes its a good idea. I wouldnt extrude hone a mitsu exhaust housing. it will make the divider too thin.

 

Yeah, good point! The divider wall in the turbine inlet area is usually the weakpoint with a twinscroll design. In the past, I've had a couple of unported KKK twinscroll housings develop cracks in the divider wall. So, it is a design weakness.

 

to the porting comment.
yea i know porting works. but i am not looking for just a 2 inch port job into the turbine housing. and if you could smooth it out all the way that would be best.

the stock mitsu divider i agree is thin. but i have a 1.06 T4 and it is much thicker. the only thing i would worry about on my hotside is the tip of the divider along the turbine wheel getting to short. if that makes sense. as for the compressor side i wonder if it will help as well.

 

anyone else know if this would work?

 

I'd love to see results, particularly on the exhaust side.

Any idea on price though? An exhaust manifold is $495.

If it's more then $200 or so, I would think the money would be better spend elsewhere.

 

manifolds are hard as they have to go from the runners to the collector. i am told the hotside or the compressor cover is around 100 bucks each

 

Considering that most places charge like $75 for normal porting on a hot side, that seems very reasonable.

Some of the divided stuff could really use it. It's pretty apparent that the divided stuff was built for diesels and tractors where reliability (thick and heavy) is far more important then performance. It would help strip out a lot of the excess material and then most of them have crappy surface finish too.

 

exactly my point. i know a regular port job does wonder's when done correctly. but what about the rest. smoothing out the rest of the turbine housing or compressor housing. i think this would work well.

 

i would be worried about the effects on the nozzle area with extrude honing. i just ported my .95 a/r twinscroll 40r housing and i got a lot farther up than you would think. i used a 6" mandrel and went an inch or so past the flange with the grinder.

 

nozzle?

i had my 1.06 ported and it is only 1.5 inch's in but the rest of the casting blows. if you use a Garrett divided turbine then yours is in much better shape then mine because pte SUCKS but you can still smooth out the inside of your housing.

i just emailed them with a few questions. ill see what they say when they reply.

 

the thin area where it actually spins the turbine area. and yeah, mine is a garrett but it isnt nearly as nice as the new stainless gt housings. those are great looking. im surprised they only went that far in. if you dont get it extrude honed hit me up, ill help you out with it.

 

exhaust pressure spins the wheel.

i know what you mean though. the divider being smoothed away on the tip where its near the turbine wheel. yep. i asked about that.

 

i have not seen them. any links?? i really do not want to go smaller then a 1.06 a .95 on my turbo IMO will be way to small

ebay had a guy making 1.10 housings but i cant find him anymore. either thats a hint or i am not looking hard enough.