whats a header like this for?

[cory51191]

so are all headers like this or is this a specific kind (its a T3 tubular header)?
if all are like this..i never noticed the 2nd exit hole..its for wastegate right? but what kind of wastegate bolts to it? send a link example please? or if i'm wrong, please explain.

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[Only2G4Me]

Not all manifolds are like that. There are lots of diffrent styles. The T3 reference is the style of flange on the end of the header that bolts to the turbo (a T3 style exhaust housing on the turbo). The design of the manifold itself, I've seen it called a "ram horn" style most of the time. Like I said there are all kinds of styles and variations of the exhaust tubes. The idea behind having a manifold like this though, is that all the runners are the same length. Therefore you get the same exhaust flow from all the cylinders to the turbo. And yes, the exit right above the turbo flange is for an external wastegate like this one-TiAL 41mm Wastegate [ TIAL-41mm-WG ]

 

[cory51191]

The idea behind having a manifold like this though, is that all the runners are the same length. Therefore you get the same exhaust flow from all the cylinders to the turbo.[ TIAL-41mm-WG ][/url]

so i'm assuming this is the best style for performance considering it offers maximum flow for all cylinders.

and as for that type of wastegate....why is there 2 fittings? what are u supposed to bolt to the other end?...recirculate it somehow maybe?

 

[Only2G4Me]

This style of manifold is great for performance, but usualy is a bit on the expensive side. Basically though, if you're looking for a performance manifold its best to get an equal length one if it fits in your budget. Tubular manifolds are usually lighter and less restrictive than cast ones. (the factory manifold on your car is a cast mani.) But it all depends on what you can afford to meet your performance wants/needs. The other port on the wastegate pictured is for exhaust exit. The wastegate basically works like a valve and bypasses some of the exhaust flow from the turbo to regulate boost. So the excess exhaust gas taken by the wastegate comes out of that second port. You could just leave it the way it is, or bolt a dump tube to it and leave it open to the atmosphere or recirculate it back into the exhaust.

 

[qnz]

that style of header is called a "ram-horn" design. I think Greddy's Wastegate is also a square design

 

[jrohner]

It looks like it's for a 4-bolt 46mm wastegate.

 

[cory51191]

This style of manifold is great for performance, but usualy is a bit on the expensive side. Basically though, if you're looking for a performance manifold its best to get an equal length one if it fits in your budget. Tubular manifolds are usually lighter and less restrictive than cast ones. (the factory manifold on your car is a cast mani.) But it all depends on what you can afford to meet your performance wants/needs. The other port on the wastegate pictured is for exhaust exit. The wastegate basically works like a valve and bypasses some of the exhaust flow from the turbo to regulate boost. So the excess exhaust gas taken by the wastegate comes out of that second port. You could just leave it the way it is, or bolt a dump tube to it and leave it open to the atmosphere or recirculate it back into the exhaust.

would this o2 (http://www.maperformance.com/map-38...ngs-stainless-steel-dsm-map-dsmo2-mvs-ss.html) be fine with it so i have more than 1 wastegate?...i'm assuming the more pressure i can relieve, the better.


to recirculate the manifold wastegate back into the exhaust what do i need to set this up? would i just need to find a machine shop to bend some aluminum piping, weld one end to a hole cut in the downpipe and weld a flange on the other side so it bolts to the wastegate?

 

[falcon8r]

Do you want to upgrade to this type? There are trade offs with a race style header. I used a race style manifold. Different animal from the external wastegate. Much easier to install . Forced performance manifold. The equal lengh header with a true merged collecter should be the best for HP. That is the ramhorn style you have illis. For a daily driver it is not so good in the long run. Tres....

 

[cory51191]

Do you want to upgrade to this type? There are trade offs with a race style header. I used a race style manifold. Different animal from the external wastegate. Much easier to install . Forced performance manifold. The equal lengh header with a true merged collecter should be the best for HP. That is the ramhorn style you have illis. For a daily driver it is not so good in the long run. Tres....

so what i just said above is a terrible idea for DD?

just seems like it'd be better for the car

maybe just the o2?

 

[knochgoon24]

That manifold won't work with the stock T25 turbo. Just so you know.

I suggest you look here.
http://www.dsmtuners.com/sub.php?page=tech

 

[cory51191]

That manifold won't work with the stock T25 turbo. Just so you know.

I suggest you look here.
Tech Guide - DSMtuners

i've done endless hours and hours of researh. just haven't seen anything on this subject. plan on bolting a HX35 to it BTW

 

[awdtalon11]

It's for a 40mm wastegate, which obx also supplies. That's the setup I'm running on my T3 PTE6152 atleast.

 

[falcon8r]

so what i just said above is a terrible idea for DD?

just seems like it'd be better for the car

maybe just the o2?

Just a minor consideration is the heat shield and vibration fatigue. If you want to stay garage bolt on and get way more than 300hp, the dsm exhaust flange is more than adequate. Just look, lot's of folks on here get some impressive output with just the 16g turbos. As the hp increases, so does the breakage upstream. A goal of what to shoot for is a great magnet for all the resources on the site. Tres...

 

[cory51191]

Just a minor consideration is the heat shield and vibration fatigue. If you want to stay garage bolt on and get way more than 300hp, the dsm exhaust flange is more than adequate. Just look, lot's of folks on here get some impressive output with just the 16g turbos. As the hp increases, so does the breakage upstream. A goal of what to shoot for is a great magnet for all the resources on the site. Tres...

vented hood. aftermarket motor mounts.

and what is "garage bolt-ons"??
stock exhaust flange... nahh i'd rather upgrade my header for better flow

i'm shooting for 500whp

first things i plan on upgrading is everything for airflow (intake, bov, turboback exhaust, fmic)

i'm gonna hold off on the turbo mani, turbo, and o2 until i can get all 3 of them at once. and until i upgrade the fuel system and get something to tune with

 

[jrohner]

I believe he's talking about the turbo flange, DSM vs T3.

 

[2gawdtsi]

get the headers,
ditch the heatshield and ceramic coat it, or perhaps heat wrap.

a hx35 is no t25, which the exhaust manifold was created for.
and an hx35 will put out well over what the stock manifold can flow.

 

[jrohner]

The talk was about DSM vs T3 flange, not an actual stock OEM manifold (not like there's really anything wrong with the stock one though).

A DSM bolton HX40 has done like 670hp; it's not like the T3 opening itself allows for more hp than the DSM one does.

 

[2gawdtsi]

oh, i misunderstood,
the above posts made it seem like he was unsure to get a new manifold, or keep it stock.

but yeah, the only difference between t3 and dsm is the flange, which doesnt have much of an effect on performance.

 

[cory51191]

The talk was about DSM vs T3 flange, not an actual stock OEM manifold (not like there's really anything wrong with the stock one though).

A DSM bolton HX40 has done like 670hp; it's not like the T3 opening itself allows for more hp than the DSM one does.

considering i'd have to change the housing on the hx35, whats the best manifold and housing to go with (500whp DD)?