porting my 2g mani...

[daren_p]

it almost seems as if you shouldn't touch a 2g mani except knife edge the divider from what i'm hearing. after looking on vfaq and MANY posts on here, everyone was doing what i was doing. i ported the runners to match the gasket where it met up with the head. i just find all this hard to believe that what i did was wrong if so many ppl have done it. it's almost like saying if you don't have a ported head an upgraded exhaust manifold is pointless. but if im wrong or missing something please tell me, i feel like i could possibly be struggling with this issue.

Knife edge the divider if you want, I left mine alone. My thought was to leave it thick to try and help prevent it from cracking. Main area is to work on is to port the collector flange outlet to match a 7cm gasket. If the runners are alreadys larger then the exhaust ports on your head I don't see much point in enlarging them even more. Just go in as far as you can and basically smooth eventhing out, as their usually pretty rough internally from the casting process.

 

[99gst_racer]

Maybe he is refering to their new cast manifold, as it looks like they don't have it cast with much of a divider anymore. I don't have personal experience with their new design as I have their older mani but this is the way it looks from their posted photos.

Well, my picture was an example of a 2G manifold with an SBR stage 1 port job. I do have personal experience with their new manifold casted with the 38mm Tial flange, and it has almost no divider at all. I'm not sure why they did cast them without it, but I'm sure they have a good explanation.

 

[LRS95TSI]

so from the factory the whole at the collector is 6 cm, and i wanna take that to 7cm correct? thanks for all the responses, i really appreciate it.

 

[oldman]

so from the factory the whole at the collector is 6 cm, and i wanna take that to 7cm correct? thanks for all the responses, i really appreciate it.

This is what I would do, I also am aware that your turbo was ported by a vendor, let's pretend that it was never ported and start over.

1. Purchase a 7cm gasket from one of our sponsors them gasket match both the manifold collector and turbine housing inlet, the better they match, the faster air travels through the turbine housing, the faster the spool.

2. Read through this thread and this article. Might as well take care of it in case if boost decides to creep up on you.

3. Finally wastegate exit and o2 housing.

That's what I call a complete 3 piece porting job.

 

[LRS95TSI]

thanks for the specific responses. not to be rude or anything, but i can remember from recollection that my turbo was ported very well in these specific spots when i got it. i think maybe the flapper part could b ported a tad, but im honestly not going to mess with it as of right now. i am gonna go ahead and finish the manifold (port the collector to 7 cm, and finish the runners to match the gasket. as noticed from my pix, i did take the divider down (but will b knife edging it). since i did this as oppose to you all, will it hurt or help me. do i need to get a new mani and try it over or will this be ok. i have faith in my porting skills but by taking the divider is it gonna b worse off then before. just for more info, i plan to add a o2 dump. once again thanks for all the help i just can't say it enuff!!!! keep adding suggestions comments!

 

[LRS95TSI]

since this is my first time i was a lil nervous....
when i drew a 7 cm circle on my mani, it looks like the porting would bring that collector cirlce out pretty close to the 4 holes on the outside for the bolts...is that the case? i did exactly 7 cm so hopefully im right.

 

[pboglio]

Opening you want is 2.36", which is the size of the 7cm^2 gasket opening.

 

[LRS95TSI]

I NEED A QUICK ANSWER!:
everyone told me to port to 7cm. the 7cm^2 gasket is actually measure different and comes out to be 6cm. if i gasket match to my over ported mani, will that create a problem. the hole would end up being about 6.5 cm diameter? i am trying to put it on today but need to kno if this will hurt performance or cause probs in future.

i realize imma idiot so please dont flame!

 

[skinnykenny84]

are you saying your mani is now 7cm and your turbo is 6 or 61/2? I am confused. what I do is take out the lip around the whole in the mani. Did you take out more than that?

 

[oldman]

I NEED A QUICK ANSWER!:
everyone told me to port to 7cm. the 7cm^2 gasket is actually measure different and comes out to be 6cm. if i gasket match to my over ported mani, will that create a problem. the hole would end up being about 6.5 cm diameter? i am trying to put it on today but need to kno if this will hurt performance or cause probs in future.

i realize imma idiot so please dont flame!

It's Ok to port your manifold collector to 7cm, I know there is enough room becuase I did the same but you must now match your 7cm^2 gsket (6.5cm) and your turbine inlet to 7cm like the collector.

 

[LRS95TSI]

lemme explain a lil better sorry....my mani is a little over 6cm ### i stopped short. the gasket (7cm^2) is 6 cm, so the mani is a tad bigger then the collector. i cannot port the turbo becuz i cant have any down time what so ever(its really complicated) .

 

[hopwoodp]

Ok, so what you are saying is that you have a "7 cm" gasket but, in all reality it is smaller and when you measured 7cm on you manifold(collector area) it looks too big, right? Now, first make sure that the gasket you have is a 7cm gasket and not the 6 cm gasket. Second, it wont hurt your manifold to port it 7 cm. I know it may look huge but its okay.

Third, you need to port you turbo if it is still 6 cm. I see that you have a ported Evo 3 16g so it won't be an issue. But, before you assemble it may sure that the gasket is matched to the manifold and the gasket to the turbo. If all lines up you are good. Because you know it won't help alot to have a ported 7 cm manifold and a 6 cm turbine inlet.

I hope this helps you out. No worries I did this before and didn't have any issues. Good luck bro!

 

[oldman]

Because you know it won't help alot to have a ported 7 cm manifold and a 6 cm turbine inlet.

Not only it won't help, it will hurt due to the step. The velocity of air flow is the most important in this part of your turbo system, would have been more acceptable if the turbine inlet and gasket was larger than the collector but not the other way around. Bottom line, all three must match to achieve best possible performance, how you do it is up to you.

 

[LRS95TSI]

i kno this is going against what u all say, but i honestly can't port the turbo. it was ported from extremepsi, i'm guessing 6cm. it is ported in the shape of a cone. if i leave it 6 or 6.5cm on the turbo and the gasket and mani a little over 6cm a minor step won't hurt too much correct? i'm sorry to go against ## suggestions but porting my turbo is not an option for me at this stage.

 

[oldman]

If the manifold is already off, why would it be so difficult to remove the turbine housing, Two nuts off the DP and one nut off the turbo and it's out. You will most likely have to deal with boost creep anyway so might as well do it right this time.

http://www.dsmtuners.com/forums/showthread.php?t=186525

 

[LRS95TSI]

i just don't think i'll have enough time in one day to port the turbo after i take everything off and then have time to put it all back together.
i got a question:
i have a 21 gallon air compressor. i use a air die grinder with carbide bits. i kno cast iron is strong but damn it took me forever to do my manifold. is that tool used in the above article better for port work. my air compressor has got to be big enuff?!

 

[oldman]

What kind of carbide bits do you have? Are you refering to the carbide burr or the wheel brush in the other article? I use a double cut carbide burr and a $9 ebay die grinder on all my portings. To port a turbine housing properly, I can probably do it in 2hrs but I'm very picky on my port jobs and I take cigarret breaks.

 

[LRS95TSI]

here is what im using!

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sorry for the quality pix, kinda just took em!

 

[oldman]

You're right, those pictures sucked. This is what I'm using.

 

[LRS95TSI]

yea thats what mine look like...i paid like 45 for em...at least i didn't get em off ebay!

 

[skinnykenny84]

tip of the day........keep the bit/mani cool as possible, when it starts getting too hot the bit is less productive. can even spray wd40 to cool it periodicly

 

[skinnykenny84]

2nd tip of the day.........there is nothing wrong with buying CERTAIN things from E-bay

 

[oldman]

yea thats what mine look like...i paid like 45 for em...at least i didn't get em off ebay!

$45? you got ripped! I get mine from a local mechine shop, same ones they use, for $16.

 

[LRS95TSI]

alright mr. wiseman don't be rude to the little ducklings! i thought 45 for all three was a good deal, newayz.... so let's say i port the gasket to about 6.3cm to match the mani and leave the turbo for now, will it hurt or improve performance from stock? i will port the turbo but ###### not till early march.

 

[hopwoodp]

Well, Like the wise man said, it is better to have the turbo ported before you manifold not the other way around. That step will hurt performance. If I was you I would go to www.vfaq.com and see the article about turbo porting. I am not sure if you know this but the stock turbine housings are 6cm.

Read the article and take the time to do it right. Why put things together now and have to take it apart and do it right the second time? Don't waste your time, do it right. Do like I said earlier and you will be happy with the results. If need be ask more questions, that is what we are all here for. The only stupid question is the one you didn't ask. Good luck