I was wondering if anybody has made an equal length manifold with a GT28 flange? If so, did you cut the collector differently? Or just use the collector which was originally made to fit a T3 flange? Just wondering what you guys do. It might be possible to weld the collector, heat it up and try to crush it a little bit so it doesn't overhang on the flange as much? Make it more rectangular Here are some pics for comparison. Thanks.

 

if you buy an unfinished collector you can tack half together at a time and belt sand it down until you get rid of the overhang.. thats assuming that the T3 is bigger.

here's what i did to improve a collector that i baught.



i'm extreemly happy with it NOW. the person who cut these collecotrs has since changed the design from what i've read (i dont blame him!!)

 

Ah, that's a good idea Did you use a woodworking belt sander? That's all I have, hehe. Thanks.

 

I have a fairly big wood lathe and used a 10" disk sanding attachment on it. worked great but i would have rather used a belt type.

 

Collectors are better now.
I take full advantage of the turbine exhaust inlet, yes the flange will need ground a bit on the inside but the collector will be larger on two sides of a triangular turbine inlet.

Here is my t25/28 collector.

 

that looks like a 5zigen header to me...

 

Is it possible to shave the inside of the turbo flange so that its round? looks like that little lip could lead to a lot of reversion

 

the collector needs to be made smaller at the bottom. the T25 flanges r more of a round shape. the air that is trying to get through to the turbo just runs right into a wall(flange). that is why it is best to take your time and use trail and error while making a setup to make these collectors to fit the flange properly. just my 2 pennies.

 

I think your thinking of the dsm t25, that is round. the t25/t28 is not and is the flange pictured.

And as i said in the last post yes you grind that lip out.

 

Looks much better. There's some company, they post on homemadeturbo.com....they make a flange that's already "ported" like you're talking about doing to yours.

 

Even if you grind that down, it's still a sharp turn for the air to make. Why not continue the collector down at that taper until it's the right size? Or change the angle of the tubes to meet at that dimension earlier.

 

Its really not that bad think about all the other obstructions the air hits in the system. Making the collector next to perfect would higher the cost and for the amount it would actually help its pointless in my mind.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by toyosupr &raquo;</TD></TR><TR><TD CLASS="quote">Its really not that bad think about all the other obstructions the air hits in the system. Making the collector next to perfect would higher the cost and for the amount it would actually help its pointless in my mind.</TD></TR></TABLE>

I guess it's all realative. There shouldn't be any obstructions in the system. I guess my mentality is if you're going to spend the time and money to do something, at least do it right. Obstructions in the path of airflow are just a sign of incompetence or laziness...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">

I guess it's all realative. There shouldn't be any obstructions in the system. I guess my mentality is if you're going to spend the time and money to do something, at least do it right. Obstructions in the path of airflow are just a sign of incompetence or laziness...</TD></TR></TABLE>

i agree

 

i dont agree.. its a great product and once that is ground down this is no obstuction so im not sure what your talking about.

 

Its relative. Nobody is going to make huge power with this turbo anyways, so it won't make any real world difference. If this was a high power drag car then ok. If you feel your missing that 5whp from having a semi obstructed collector flow turn the boost up a bit lol.

My point is, a t25 turbo isn't for a serious power turbo kit, so what difference does it make.
( + i supplied him the collector for it too lol )

 

Ugh.. bad blood. i think that if its for a t25/t28 its obviously not meant to make too much power and cost is more of a concern. However, i'd like to see a company make a collector that would fit the flange it is used for exactly be using a flat piece of SS in between the collector tubes to make it a actual rectangle. I gues the only reason i would see this as effective is because it seems the collector would nee more material in the middle if each side to make it a rectangle because 4 tubes cut into qtr's at the bottom would only be a square without lengthening one side. The only problem is im not sure on how it would fit up inside the collectorm i guess its time to test it out on old toilet paper rolls...

No one i see is doing this.

 

Like this:

 

well what i have seen on most post about cutting a collector for a t3 is measuring the angle then cut , then rotate then cut again .. make 4 like that and they should all be symetrical ..


well untitled instead of welding in a pice of s.s .. y not just make two diff size cuts ..i mean say first cut is 1"off the 2" tube .. well if u made all like the u get a oval or circle .. well make the first cut the lenght needed .. so

lenght of the flange flange inlet - diam of tubes=what u need to cut off /divide by 2(b/c two pipes)..

now hieght of the flange inlet -diam of tubes=what u need to cut off/divided by 2

the hieght cut will require more matierial needed to be cut off b/c its not as high as it is long .. a reqtangle ..

just look at toyosup pic .. see were u can see the big part of the flange portruding into the collector .. well just remove material from the height part of the flange to bring the pipe closer "in" .. the length on the pic seems just right ..

hope that was usful ..

p.s .. a t28flange is a bigger pita then the t3 ..

i still cant get it donw right ..

also toyosup .. your collector is basiclly pipe cut in half ? how come u dont make it like the other merge collector were its a full pipe on top then u get thoes points that meet up in the middle ?

 

I see what you mean but since its a round pipe it would turn out like a clover... you see? kinda hard to explain without actually talking to one another about it...


Can i meet you for Dinner sometime? j/k

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by untitled &raquo;</TD></TR><TR><TD CLASS="quote">I see what you mean but since its a round pipe it would turn out like a clover... you see? kinda hard to explain without actually talking to one another about it...


Can i meet you for Dinner sometime? j/k</TD></TR></TABLE>

clover ????? wtf .. i knda dont get it .. how so? .. one side has more cut off then another ..

were u located .were having taquitos tonight ..

 

or hit me up on aim at mk2vw16v ..

 

You guys following me at all?

 

my collector is 4 tubes cut i just cut the bottom of a collector off so you can see the inside.