OOOPS, too much porting?

[Robby Camero]

I have a few extra 14b exhaust housings laying around so I decided to play with one at work (machine shop) and match it to a 2g o2 housing which is severly ported (I mean its almost half the weight now after I dug it out some more)

OK, the waste gate and inlet sections went well, as I have done this many times before but I decided to try something new on the outlet of the exhaust housing. I bored the hole where the turbine sits out about 3 mm bigger all the way THROUGH. I then machined a new radius on it where the turbine wheel sits because the boring removed most of the origional radius.

Problem!!!


When I put an old center section I had laying around in the housing to see what it looked like, I realized that there is now a gap between the turbine wheel and the outlet of the housing. There always was a little gap but now its like 2 mm a side or mabey a little more, I didnt measure. I am thinking I should have not touched this part of the outlet and only bored the end at the o2 housing out and blended the two ends together. "Bellmouthed" to match o2 is what I am trying to say, which is what I usually do but I felt lazy and wanted to try some things on the cnc machine for porting.

My question is will this housing be useable or is this gap too big between the turbine wheel and the exhaust housing. Will it spool the same or will the exhaust just pass through the gap not spooling the wheel as much.
I have it in front of me right now and I have the shaft out of the center section. It doesnt look like it would affect spool too much because most of the turbine wheel is still in the path of the entering exhaust gasses.

I wish I took pics. Its beautifull!!!! its almost 2-3/8" diameter all the way through now, and is continued on through the o2 housing the same diameter and bellmouthed at the end of the o2 housing to match a 3 " down pipe. Its like an EVO now, except for the bigger gap.

I plan on using this with my big 16G comp housing and center section if indeed some of you can answer my question and the housing is still ok.


Very sorry for the long post,
Rob

 

[Defiant]

You don't want to open up the housing. You want the exhaust to expend as much of its energy on the wheel that you can get it to. Which means making it ride the blades all the way out.

 

[Robby Camero]

Shit!

 

[RipperXX]

There is another posible fix.


If you could get a exhaust turbine from a EVO 16g in there it might then take up enough of the gap.

I would look at the exhaust turbines of other mitsu turbos. You may have mistakenly created something...


(Would be intresting to see what a exhaust turbine from a much larger turbo would do to the same 14b compressor wheel...)

 

[kpt4321]

WRONG! The 16g has the EXACT SAME turbine wheel as the 14b, the TDO5H.

This is why you can't just go around porting th crap out of stuff hoping it'll be totally awesome.

That housing is junk now, all the exhaust gasses are going to just go around the turbine.

Why did you feel the need to open up the whole turbine outlet? Next time, taper it out.

 

[RipperXX]

Hey, it was just a thought. Chill dude. (what about that of a 18G or 20G?)

 

[Robby Camero]

Yeah I know, I suck!

I dont care though, I have two more to play with. I'll taper it next time.

 

[kpt4321]

I am "chill."

The 18g is the same as a 14b and the 16g. Some 20g's have the TDO5H, and some are TDO6H. The BR20g is a clipped TDO5H, and a lot of other companies make the same turbo. It's cheap and effective.

However, you can also get the 20g with a TDO6H wheel, that is the optimum way in my opinion.

 

[Robby Camero]

I am not gonna bother with a new wheel, I'll try housing # 2 this weekend. I'll take pics this time.

 

[RipperXX]

Darn, and I realy wanted to know how it would react with a larger wheel.. (duno why I didn't think of the TDO6H *smacks self* was just makeing sudjestions and not thinking.)