good port.bad port

arash15 · Jul 19, 2005

so does the porting look good or do i need to go more into the runners or the manifold? i found some hairline cracks in the 2g manifold next to the collector area. i dont know if thats somethin to worry about.

92tealTSI · Jul 19, 2005

collector area looks pretty good. you can open up the runners alot more though!

daren_p · Jul 19, 2005

92tealTSI said:
collector area looks pretty good. you can open up the runners alot more though!

Just check the runners against the port outlets on the head. Theres no point in making the runners huge if your exhaust ports in the head aren't as large.

I guess circles weren't your strong point in school

arash15 · Jul 19, 2005

daren_p said:
Just check the runners against the port outlets on the head. Theres no point in making the runners huge if your exhaust ports in the head aren't as large.

I guess circles weren't your strong point in school

not with a chipped carbide bit. LOL

porting is like slave labor. i can always touch up. but should i be worried about that hairline crack on the center divider in the colector of the manifold? i dont want it to grow.

gheintz81 · Jul 19, 2005

arash15 said:
not with a chipped carbide bit. porting is like slave labor. i can always touch up. but should i be worried about that hairline crack on the center divider in the colector of the manifold? i dont want it to grow.

I would say as long as its not through all the way then don't worry bout it, unless you want to find someone that can weld cast to maybe stop the crack.

CanadianTSi · Jul 19, 2005

Hairline cracks in the collector are perfectly normal.

daren_p · Jul 20, 2005

When I took my mani off my 2g, I found a large crack ~3/4" long in the larger center diverter in the collector area & this was with 35k on the car so I would say that its pretty normal for them to crack. I didn't want to take a chance so I bought a SBR cast mani but I think it was more of an excuse just to upgrade :shhh:

Burnett03 · Jul 20, 2005

arash15 said:
so does the porting look good or do i need to go more into the runners or the manifold? i found some hairline cracks in the 2g manifold next to the collector area. i dont know if thats somethin to worry about.

manifold is pretty sloppy down at the collector

arash15 · Jul 21, 2005

Burnett03 said:
manifold is pretty sloppy down at the collector

that was only an hours worth of porting. that damn bit is almost dead, and i wanna find em locally so i can finish it up real nice. what do you think about the porting on the turbo? should i keep working on it?

daren_p · Jul 21, 2005

arash15 said:
that was only an hours worth of porting. that damn bit is almost dead, and i wanna find em locally so i can finish it up real nice. what do you think about the porting on the turbo? should i keep working on it?

Its kinda hard to tell from the pic, but from what I can see the porting looks ok. It looks like its still rough, though. I'd get some sanding drums to smooth it out and then finish it off with a fine grit flapper wheel, this will give it a super smooth finish.

oldman · Jul 21, 2005

It's kind of hard to tell what you did with the turbine inlet but you might want to use this opportunity to knock off the material on top of the wastegate entrance to provide a directly path to it to ensure that you will not creep. I do agree with most here that you need to clean it up, make sure the collector mates up perfectly with the gasket and the turbine inlet. Good luck.

arash15 · Jul 21, 2005

surprisingly enough, everything is gasket matched. LOL

even though it doesn't look like it. "oldman" when you are referring to the <top of the wastegate> are you talking about the side that is closest to the top of the turbine housing? or the bottom portion of it?

oldman · Jul 21, 2005

arash15 said:
surprisingly enough, everything is gasket matched. even though it doesn't look like it. "oldman" when you are referring to the <top of the wastegate> are you talking about the side that is closest to the top of the turbine housing? or the bottom portion of it?

Read through this tech write up, it should clear things up for you.

siceclipse · Jul 21, 2005

Do you really need to port the runners? I was porting my manifold a couple weeks ago and called up RRE to find out how deep i should go in and the tech i was talking to laughed and said for the work you do on the runners the gains will be very small. He said that the only real port work that needs to be done is on the collector and center divider. its too late for me now since its in the car already but can anyone back this up or disprove it?

oldman · Jul 21, 2005

siceclipse said:
Do you really need to port the runners? I was porting my manifold a couple weeks ago and called up RRE to find out how deep i should go in and the tech i was talking to laughed and said for the work you do on the runners the gains will be very small. He said that the only real port work that needs to be done is on the collector and center divider. its too late for me now since its in the car already but can anyone back this up or disprove it?

They're half right. The reason for the minimal to no gain is because, as already said above, the head is not ported yet. If the head is ported, you would want to match the runners to the exhaust ports of the ported head and about 2 inches into each runner.

daren_p · Jul 21, 2005

oldman said:
It's kind of hard to tell what you did with the turbine inlet but you might want to use this opportunity to knock off the material on top of the wastegate entrance to provide a directly path to it to ensure that you will not creep. I do agree with most here that you need to clean it up, make sure the collector mates up perfectly with the gasket and the turbine inlet. Good luck.

Hmmm, does he even have to worry about boost creep? Its not like he's running an evoIII

I did do porting like that before I installed my evoIII and I can hold 14 psi no problem, without creep. Not that you'd want to run 14 psi anyways

oldman · Jul 21, 2005

daren_p said:
Hmmm, does he even have to worry about boost creep? Its not like he's running an evoIII

Hard to say, my small 16g used to creep to 22psi+ and here's a 14b for you.

Believe it or not I had helped out another guy with a creeping T25 as well but I can't find the thread anymore.

arash15 · Jul 21, 2005

Ive been porting the runners some more. just to get it nice and even. almost all the way through the entire runner. i cleaned up the collector ALOT. man that thing was ugly. but i haven't touched the turbo yet. ill leave that for tomorrows work. the turbo is a PTE 50 trim for those of you who were wondering.since its already ported in its cast design i don't know how much more i should go. Since I'm not in any hurry to get this setup back on the car, I'm taking my time with all the porting to make sure it is right. But can there be tooo much porting???? this setup is gonna be running on a street setup with 91 octane and i want to get the MOST power i can out this turbo. I don't want to just be another guy running a 50 trim in Cali.
P.S. I'll get some more pics up once i get out of work.

arash15 · Jul 21, 2005

here are some pics of the port job i did

siceclipse · Jul 21, 2005

see now thats what im talking about. what he did, is that pretty much just to resurface the runners? you can see how far out he could have gone.

siceclipse · Jul 22, 2005

shit! i knew it would double post!

gheintz81 · Jul 22, 2005

arash15 said:
Ive been porting the runners some more. just to get it nice and even. almost all the way through the entire runner. i cleaned up the collector ALOT. man that thing was ugly. but i haven't touched the turbo yet. ill leave that for tomorrows work. the turbo is a PTE 50 trim for those of you who were wondering.since its already ported in its cast design i don't know how much more i should go. Since I'm not in any hurry to get this setup back on the car, I'm taking my time with all the porting to make sure it is right. But can there be tooo much porting???? this setup is gonna be running on a street setup with 91 octane and i want to get the MOST power i can out this turbo. I don't want to just be another guy running a 50 trim in Cali.
P.S. I'll get some more pics up once i get out of work.

The PTE 50 trims do not require any more porting. Also 91 octane might not support the boost a 50 trim would like to see.

Defiant · Jul 22, 2005

Remarkable feats.

blcknspo0ln · Jul 22, 2005

did you put socks on for your 2nd round of photos too?

good job. I usually port with carbide, then stone, then wire wheel. EXCELLENT results taht way ! :thumb:

arash15 · Jul 22, 2005

blcknspo0ln said:
did you put socks on for your 2nd round of photos too?

good job. I usually port with carbide, then stone, then wire wheel. EXCELLENT results taht way !

. when you wake up hungover and somethin just strikes in your head, i just go do it! haha. theres no time to get everything nice and prepared. or wear socks.

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