Is this a correct turbo housing porting job?

[Sotarts]

I've never seen it ported this way.
The guy in the shop says that port will help even more. Wouldn't the WG gases interfere with already flowing gases, screwing up s smooth flow?
Then there's a 34mm flapper installed, but the passage is only 25mm or smaller. He says they cannot port it up to 29mm. Is he full of sh*t?

 

[GSX4LIFE]

This is the popular tecnique used by PTE to help with creep. This is not traditional turbine housing porting.

 

[Sotarts]

Would that cause any problems though? It seems I will have to take out some of the o2 housing devider as well. Otherwise the smooth flow will be greatly disturbed.

What about waste gate passage? The guy says he cannot do it to 29mm. He didn't even know what it was ported to. I took a ruler and it looks like 24 or 25mm.

 

[kpt4321]

Yeah, it will create a little more turbulence, but not much more then there already is.

You will have to remove some material from the O2 housing.

I would leave the hole the size it is for now, and then open it up more if you need to. The larger the hole is, the greater a chance you have of the flapper door blowing open, which is very common.

You also might want to pay a little attention to the wastegate inlet area right after the collector.



....Kyle T.

 

[jbillakdsm]

I would agree that this is not the traditional way of porting, but has been pondered for a while. When you take that section out, you are making a greater area for exhaust gas to get away from the wastegate and out to the rest of the exhaust helping with the creep issue. On the other hand, you are making part of your O2 housing into a wall for gas to smack off of.

I personally would rather take an EVO gasket and match up with it for effective performance. I used my 14b and a 2g O2 housing and matched it with a EVO gasket and I get no creep with the stock wastegate flapper installed. I spent more time porting around the top of the wasteagte so it could open fully and only a little making the hole larger and smoother. If you're going with a 34mm flapper I think you can use a 1 1/8" drill bit to run down the hole but don't quote me on this. That would make the hole 28.575mm in size and would still leave more than enough room for the WG to close and not blow open.

 

[Sotarts]

Originally posted by jbillakdsm
I would agree that this is not the traditional way of porting, but has been pondered for a while. When you take that section out, you are making a greater area for exhaust gas to get away from the wastegate and out to the rest of the exhaust helping with the creep issue. On the other hand, you are making part of your O2 housing into a wall for gas to smack off of.

I personally would rather take an EVO gasket and match up with it for effective performance. I used my 14b and a 2g O2 housing and matched it with a EVO gasket and I get no creep with the stock wastegate flapper installed. I spent more time porting around the top of the wasteagte so it could open fully and only a little making the hole larger and smoother. If you're going with a 34mm flapper I think you can use a 1 1/8" drill bit to run down the hole but don't quote me on this. That would make the hole 28.575mm in size and would still leave more than enough room for the WG to close and not blow open.

That's alright. They had that already ported, so I gave them $150 + my turbine housing and walked out. Then I measured the WG passage and it was enlarged only to 24mm, the guy said it would cost even MORE to port it to 29-30mm. $150 + more. Rip-off.

I went back Monday and returned it, got my $150 and turbine back.

The non-traditional removal of the devider would work much better when used with an aftermarket o2 sensor housing (with no deviders inside, which I might end up doing, otherwise I think I'd have to remove lots of stock o2 housing devider to smoothe out the air-flow.

It's pathetic though, that closest local shop is so overpriced. Rediculous.

I shipped out the housing elsewhere (accross the country :laugh: ). Where I'm sending it, they will enlarge the WG passage to 29-30mm, install a 34mm flapper, and judging from pictures on their website, do a much better inlet porting job - ALL FOR LESS. Even with shipping paid both ways, I still saved $30.

That's just f*cking pathetic.

 

[ChicagoGSX]

The other thing about that is if you have an external dump then it will be loud all the time.