14B People, A few questions

[sd_ff22]

its a 2g, so I will just have to make the 14b wastegate passage match the 2g o2 sensor houseing. I saw someone else high temp painted the compressor cover. I may just do that too. as for the porting, I really enjoy it! I ordered my gaskets and oil feed line today so I'm almost set!

 

[Caithness]

Porting is a ton of fun, I agree. The only downside is the large amount of metal lodged in your skin in the form of tiny iron spikes after you're done. It's still worth it.

I port to match a crushed 60mm/7cm^2 gasket. If you don't have a crushed gasket, leave a small lip around the inside edge of your new gasket, or when the gasket crushes it will stick out into the exhaust flow. I also generally port the exhaust manifold outlet a tiny bit smaller than the turbine inlet. It's my general rule of porting- there's a small amount of slop in the bolts, and if you port to exactly the same size you might get a lip on the turbo side sticking out into exhaust flow depending on how the bolts cinch down. I feel that a small step bigger in the direction of exhaust flow is better than a step smaller facing exhaust flow.

Another thing you can do is make a smooth transition in the turbine outlet to the o2 housing. It seemed like most people recommended against this when I was researching it. I think it's just fine as long as you don't touch the housing within about 1/2 inch of the turbine- if you go too close to the turbine wheel you will definitely hurt flow. But making a slow expanding cone outward to match the interface with the o2 housing seemed like it couldn't hurt. My judgement was (IMO) proven correct when I first saw an Evo 16g turbine housing- they have a similar turbine outlet that expands from the size of the turbine wheel at about 1/2" out to the size of the evo o2 housing at the outlet. In any case it certainly doesn't seem to have hurt my 14b power numbers .

Also, if you're concerned about creep, look up the Oldman boost-creep-elimination port job. In crude terms it's sort of a groove cut straight down to the wastegate passage to make more exhaust exit through the wastegate. Don't just cut a groove on my word- go look at his pictures and see what you really do. I purposefully avoided this when I did mine because I wanted it to hold as much boost as possible. I actually rounded off the little notch they made to catch exhaust gas flow and direct it into the wastegate so that more would flow through the volute. I don't know how much of a difference that made but I haven't had any trouble holding as low as 15 pounds of boost even with an open 3" downpipe.

 

[sd_ff22]

Caithness-
yeah I was looking at the example of the monster td05 exhaust housing. it has that flared exhaust passage into the o2 housing. I could'nt find the " Oldman boost-creep-elimination port job" you were talking about, but I am not really concerend about not having creep. I am concerned with as quick as possible spool.

Dream On-
you would be surprised but as I have been pulling this trbo apart, it is suprisingly clean and good conditioned inside. that seal is good, no cokeing, very little shaftplay.

 

[sd_ff22]

Oh and Bohrn,
can you tell me more about this??

"I found a well ported 14b to be very potent "

yes everyone I realize that I'm taking this slow, but i'd really rather take my time and do it right instead of just throwing it on and hopeing it works.

I'll keep you posted

 

[pneumo]

Here's a post I wrote about porting the compressor housing. There's a few more ponies tied up here, too. Don't do it if you're using the stock intake. If you have a large intake it's worth it.
www.dsmtuners.com/forums/showpost.php?p=50400274&postcount=7

 

[sd_ff22]

hey guys, I need a "holy $hit!" answer to a question! I just got done doing all my porting including gasket matching the exhaust inlet and out let to evo gaskets, and I also ported the hell out of a 2g o2 sensor housing. I also did the waste gate flapper 90degree port work. My question is this:

Why do the PTE turbos have the divider between the wastegate outlet and the exhaust outlet removed and is it worth it tp do that on my turbo? I am sure I wont have a creep issue as I've done a lot of porting but I want quickest possible spool with this setup. thanks for the answers guys. I will be back on here in about 4 hours and I hope some ones chimed in!

 

[Dream On]

I think it's just done that way to help with boost creep. I wouldn't do it on yours though. I think that it would be pretty turbulent in there with that wall removed.

 

[romeen]

I agree with Adam. Although removing the divider might aid in preventing boost creep (I don't think it's effectiveness has been clearly established yet) some guys who have done it feel that it negatively affected boost response, particularly with getting back into boost after shifts.

 

[Bohrn]

I would also caution on trying to remove boost creep too agressively. Yes creep sucks, but it can be dealt with.

what can't be dealt with is boost falling off. If you ever plan on running more than 16 or 17 psi, I would be careful.

I ported my turbo but left my wastegate passage completely alone. Also the stainless Evo gasket I used had a smaller opening for that passage and I left it alone.

Above 5800rpm boost would steadly fall off to about 16 or 17 when it was set to 22 psi.

 

[sd_ff22]

alright thanks guys, to tell you the truth when I got off watch the last thing I wanted to do was more porting. well I already cleaned and smoothed them all up and I'll get pictures in here tomorow showing my work. I think i did a damn good job for my first port and I can't wait to get it on the car.

 

[sd_ff22]

wow...
I'm embarased by these now that I get camera shots of them!!! they looked so good from a normal distance.
oh well.
here's the mess.

 

[Dream On]

I would try again honestly. There's a lot more material you can take out and a lot more smoothing up you could do. I realize porting isn't the most fun, but it pays off if you do it right.

 

[pneumo]

Just a little more to go and you're done.

I like the O2 inlet and turbine housing outlet, looks good. The porting around the wastegate in/outlet looks nice. Try to smooth the turbine inlet a little more, and blend it with the rest of the housing. There's not much more work in that area.

There is more room to port the O2 housing outlet if it'll match your downpipe. I can't see it well, but make sure you port the O2 housing all the way through as large as possible. When you're done it'll support some nice power!

 

[sd_ff22]

thanks guys, yeah I know that turbine inlet looks bad. should I remove more material from the turbine inlet around the wastegate passage? also the reason I only remove the step on the o2 housing outlet is because I am still using the stock downpipe and I know the rule of big to small.

 

[pneumo]

nah, don't worry about cutting back the wastegate inlet any farther. You've already cut it back plenty.