porting out 2g manifold and mating to stock 14b questions

[coryf1233]

If i port just the lip out of the manifold , that will not bring the manifold to 7cm correct? i dont have the time to port the turbine housing out to 7cm as well.

Also I have a 7cm gasket and the hole in the gasket is bigger then the manifold collector so am i still in the clear as far as mating the manifold and turbine without porting?

Also can i use a stainless 7cm gasket on 6cm parts?

 

[jjrock5]

If i port just the lip out of the manifold , that will not bring the manifold to 7cm correct? i dont have the time to port the turbine housing out to 7cm as well.

No that will not bring to to 7 cm^2 area, you have to place the 7 cm gasket on the mani, trace the hole with a marker and get to porting and cover yourself in metal shavings...its fun times.

Also I have a 7cm gasket and the hole in the gasket is bigger then the manifold collector so am i still in the clear as far as mating the manifold and turbine without porting?

Yes if the hole is smaller than the gasket, then you are clear to move. But you maight as well port the mani AND turbo, if thats where youre heading with the question...

Also can i use a stainless 7cm gasket on 6cm parts

This is basically the same question you asked above but, yes.

 

[dsm-onster]

Why would you port the collector outlet and turbine inlet to what a 7cm^2 housing is? Where's the gain? You're not making the turbine housing flow more by jsut opening the inlet to it any more than running the stock gasket and seal ring. Just get a seal ring and run the stock 6cm^2 gasket. Save yourself the time and get a smooth transition from the collector to the housing.

 

[jjrock5]

Please explain, so then why the heck do most ppl gasket match their turbines and manis to a 7cm?? which is also shown in the vfaq.

 

[donniekak]

The evo3 turbine housing housing is the housing with a larger inlet. That is the housing people port out their mani's to match.

 

[jjrock5]

ANY housing would benefit from a wider opening, as it is known, gas likes to take the path of least resistance so opening up even the mouth will create a larger area for the gases to exit. I recommend to go one step further on porting INTO the housing. And I think any time spent is worth the time if the owner is interested in at least a few 100 RPM of faster spoolup and maybe a couple HP. I guess its all in what the owner wants.

 

[dsm-onster]

Bull. The turbine housing simply necks back down to the 6cm^2 critical area housing by the time you get to the actual volute affectign the turbine wheel. You've now created an even LARGER transition from the collector to inside the turbine housing vs. using the seal ring.

As mentioned, the point of porting was to get a 2g manifold to work with a 7cm^2 turbien housing. Since there is no seal ring that can transition from a 6cm^2 outlet to a 7cm^2 inlet. By doing this to a 6cm^2 turbo like the 14b, you've just created more volume in the collector and entrance to the turbine housing to slow the gases; AND caused a greater area difference between the turbine housign inlet to the actual volute. Everyone knows increasing difference in the area difference ina transition kills flow.

I know THROUGH ACTUAL EXPERIENCE that you won't gain not one bit of spool speed going from a 6cm^2 setup with the seal ring to 6cm^2 setup ported to a 7cm^2 opening.

You can't turn your 6cm^2 housing into a 7cm^2 housing with an inlet port job. You can't turn your .48 a/r garret housing into a .63 a/r housing with a port job. As well, MHI has matched the turbine inlet to the turbine housing critical area already. They seamed disinterested in great differences in transition from the turbine inlet to the actual volute critical area (the inlet hole is MUCH greater than 6cm^2 or 7cm^2 for their respective housings). The evo3 manifold doesn't come with a 6cm^2 turbo from the factory. The 5cm^2 13g turbo on the automatic also has attached to a manifold with an even smaller collector area than the 1g/2g 6cm^2, to match the smaller critical area of the 5cm^2 housing.

 

[coryf1233]

so i already ported the collector portion of the manifold, I do not have time to port the turbine housing, but i have to put a new exh manifold gasket on , so i figured i would put the new manifold on, are you saying that by porting the collector, it will do a worse job then just leaving the stock 1g mani?

 

[jjrock5]

Well then I hope that 100s of dsmers read this and bash themselves in the heads because almost EVERYONE has had their hand at a port job, even by opening the mouth. As far as myself, I did what I just described above and actually FELT and saw on my RPM gauge that the spoolup on my T28 was faster by about 250-300 rpms. Now to me this was worth the few of hours I took to do the porting. I guess it is at this point that ppl are distinguished whether they are dedicated enough to get those 'measly' extra hp/RPMs. Also, I suggest you go ahead and go through the process to remove the Porting VFAQ because apparently that is not as correct as youd like it to be.

But you are a Wiseman so I respect your input in this thread. To each their own.

 

[dsm-onster]

You felt an increase in spool speed vs. running a seal ring. Right. I felt no difference. Did your t28 come with a 7cm^2 inlet? If not then you wasted your time. The VFAQ is abotu the 7cm^2 housing with the 6cm^2 manifold. OR if you cannot get the seal ring. . . The actual pictures and porting done on the vfaq specifally are of the 7cm^2 turbine housing.

For years, we've been doing things certian ways. That has nothing to do with what actually brings you a benefit. There is no reason to believe a larger collector volume, which is all you would be doing here with a 6cm^2 housing, would actually help flow and spool. Now if you can't find the seal ring or don't ahve the cash to buy the cheap ring (but manage to have the money to run a compressor for that long) or you have a 7cm^2 housing and a 6cm^2 hole (that cannot have a ring to smooth the transition, then port 'til you hearts content. Why waste your time making a larger collector volume which won't make a smoother transition than jsut putting in the seal ring?

 

[jjrock5]

Yes sir, thats what I said. And no, it didnt come with a 7cm^2 housing.

 

[coryf1233]

I dont mean to sound really repetitive. I was just under the impression that porting the lip out of the collector, would help flow. If the 2g manifold flows better in stock form, how would it not give positive results porting the lip??

 

[jjrock5]

I think the Wiseman already answered your question. I know I already gave mine and my opinions on the matter. Now its in your hands as to what you want to do.

 

[dsm-onster]

If you've already ported the 2g manifold, then you ahve to match your 14b turbine housing to that now.

There's no benefit to removing the lip because, if you use the seal ring, there is no lip. It didn't help my 14b at all.

 

[coryf1233]

thats what i needed to hear, thank you sir

 

[dsm-onster]

No problem. Jjrock5, thank you for your input here, too. It's something to think about that one person saw no gain with the 6cm^2 setup and another did.

 

[jjrock5]

Yeah sure, no problem. Im probably not as experienced as you are but Ive had my share of wrenching time and experimentation. I hope this info will help in any way.