Thread: Welding external WG onto stock manifold?

You mean he needs the exducer housing (the exhaust housing)? I guess because they don't have a jig for your setup just yet. That is unfortunate. I would still do the TurboFX part even if I had to wait 6 weeks over any of the other solutions, I really would. Maybe you could buy a GTi-R manifold for like $80 (saw one for sale yesterday...) for which they already have a jig made which may speed things along? Ask them about it...

Buy a busted turbo for super cheap to send them that exhaust housing?

Lots of ways to skin this cat...

I would get the ball rolling on the TurboFX part and get this done right. Get everything else ready to go in those 6 weeks so you can just bolt the thing on and go?

Hi Ben,

The 5-6 week lead time is for already fabricated parts. This was actually for the Bellmouth design so it's possible the split dump would take even more time if I needed to send my housing off for a custom/new job.

I had my car down for about 2 months during my engine rebuild..wish I thought of doing this then! :/

GTI-R T28 housing is an option...it should fit over the 2871R, correct?

-G

Can you clarify this?

So the turbo you're going to use is a GT2871R? (TurboFX should know that those exhaust housings have a built in divorce wall, so their custom j-pipe doesn't need to implement that.)

And you want to know if you could simply send them a GTi-R exhaust housing in it's place for them to work off of? (If that is the case, I am 75% sure the GT28 series Garrett turbos are all based around the T25 exhaust side and compressor side both, which means they have the minorly different T25 style output flanges. Which means you're better off sending TurboFX a T25 exhaust housing instead. I think.)

Or were you suggesting something else?

I was suggesting having them send me their GTIR design and getting a GTIR exhaust housing to replace my 2871R housing as I'd guess I wouldn't have to send them the GTIR housing since they already have one designed. I thought that's what you were suggesting? lol..

It does have a divorce wall, but it doesn't go all the way to the top of the housing so I think there's still turbulence and a divider would still be required. Perhaps all I do need then is the bellmouth design and just keep my current housing? I do have boost creep, but I'm not convinced it's the housing I think it may be the wastegate itself. I'm really looking for smoother flow more than anything.

-G

I was suggesting a GTi-R turbo manifold... Aren't you using an Avenir one?
Although your idea of the different exhaust housing might help. I think you should contact TurboFX and find out what part versions they can get out ASAP and see if you can accommodate that?

I've not studied one in person. That's a bit disappointing. =/

That might be the ticket.

Oh well that changes everything. I didn't know that. Any of the TurboFX options are going to increase creep versus a stock J-pipe. They increase the flow of the main exhaust part much more than they do for the wastegate, so creep gets a bit worse... Not better.

Right. Your external wastegate idea seems to hold more merit now.

If the flow of the main exhaust is most important and the creep isn't a bid deal then one of the TurboFX solutions could still work for you.

I am using an Avenir. What are the advantages to the GTI-R manifold? That would require a DP flange re-adjustment, no? Nothing gets out ASAP. Like I said, even the bellmouth are 5-6 week wait.



Oddly enough, this is what A.Miko says as the VET seems to share the same housing as my 2871 you can also see what I mean by the divider not coming all the way up:

http://www.sr20-forum.com/174571-post134.html

Actually, mine is a little different:

I knew the divider wall had that little hole, but I never noticed it didn't come all the way up. Building something to work with that is going to be a total bitch for TurboFX (I'm sure they could do it but it will take even more time). If you keep that exhaust housing, I'd just go with a bellmouth setup. If you want to swap to a GTi-R T28 housing then a full divorced makes more sense. Again, I'm not 100% sure the GTi-R T28 exhaust housing will bolt on and fit the GT28 exhaust wheel properly. I think it will, but not sure.

The advantages of the GTi-R turbo manifold over the Avenir is better flow, and slightly better turbo placement (a little further away from the block and transmission mating surface). It is also made of much higher quality cast iron with a high nickle content. GTi-R manifolds are so cheap, I honestly don't know why anyone goes with the BB or Avenir setups...

If you went with the GTi-R exhaust manifold, it does place things more toward the radiator. That means most people go with a GTi-R j-pipe which puts the outlet of the exhaust in the right place for a typical downpipe, which is turn means the DP flange needs to change to match the GTi-R j-pipe flange difference. Obviously TurboFX could build you a j-pipe that wouldn't require that change...

I had no idea the GTI-R manifold flowed better. I thought it was only better at turbo placement/position. If I knew that, I would have gotten one from the beginning. Do you have any references/proof that it flows better?

-G

Everyone has always said it flows better, I have no doubt it flows better, looking at the design of it and the bends and the diameter of the "pipes" make me think it flows better. I've never seen actual proof, but I think there was some waaaaay way back. It is basically a given now. No one questions it, so I've not seen proof ever posted. Maybe someone who was more connected in the scene for longer will have that info.

weird, I never had the impression that it flowed better but maybe I was just not paying attention...I guess the question then becomes HOW much better?

-G