Turbo Manifold Options

[GTSBoy]

Yuh, 2" is a bit on the side.

[Dan_J]

it just means you would have less response and some more top end power then smaller dia tube

[GTRNUR]

That would have to be 2" OD, not ID. Id will be about 38-40mm.

[GTSBoy]

If it were pipe I'd agree, but it looks like thinwall tube.

[R32N00B]

double post :-/

Edited September 19, 2013 by R32N00B

[R32N00B]

My mistake gents
Not 2in ID, yes the od is actually 1.9in hence the confusion
Weld els measure differently than regular pipe
Medium runner manifolds (typical manifolds you see like 6boost/full race etc) are 1 1/4" weld els but have an inside diameter of 1.44in (od 1.66in)

Mine was built with "large runners" 1 1/2" weld els
Which have an inside diameter of 1.66in (od 1.9in)
Sorry for the confusion there. But this thing is just massive next to the full race we have sitting around its so much tighter together with the larger runners.

It's also not thinwall like someone said
This is stainless steel 304 schedule 10 pipe

It's like the 6boost but it's stainless not mild steel and larger runners

Edited September 19, 2013 by R32N00B

[R32N00B]

what i meant to say is pipe measures differently than tubing.... tubing is measured OD where pipe is measured ID.....

1.25" pipe has a 1.25" ID (on schedule 80 pipe) the OD stays 1.66" so schedule 40 pipe will have a larger ID and schedule 10 even larger. Thats why my 1.5" pipe has an ID of 1.66".... it only has an ID od 1.5" on schedule 80 pipe....

hope this makes sense

[GTSBoy]

Makes sense. It was clear that it is huge, as it takes up all the room between the engine and, well, everything else on that side of the bay!

I just said it looked like thinwall because the welds are more like the welds you see on tube. But given that you have used Sch10 pipe, which has only a 2.77mm wall thickness, that explains the welds. Not as thin as tube, but pretty thin for pipe, hence the welds end up looking wide and flat.

[R32N00B]

ya sch 10 is .109" (sorry im going imperial on you lol its what im used to here in the states)

schedule 10 pipe is PLENTY thick for manifold. as long as its built and welded/backpurged correctly it's the optimum thickness. Any thicker is a waste and will weigh quite a bit more, and also will have smaller diameter ID. At least this is my fabricators point of view. He hasnt had one crack yet and they're out getting all out hammered on a daily basis.

Edited September 20, 2013 by R32N00B

[R32N00B]

also as a note on the welds my guy likes to taper the "butts" of the pipe all the way to the ID. Typically they come tapered halfway in but he likes to taper it the entire way, that coupled with full backpurging allows for deep/full penetration.

[scotty nm35]

I just saw 430kw flow through a stock exhaust manifold, GTX35 at 26psi. Surely there are better things to spend your hard earned on?

[AngryRB]

Id definitely stick with a stock manifold in future, from what I remember the runners were slightly larger diameter in comparison.

[rondofj]

430kw through stock mani- is that in an RB25? Sorry I didnt read the earlier posts ;-

[B-rice]

quite interested on some more info on the 430KW stock mani if its not really off topic. It would be good if you could compare engine temperature of a top mount and low mount.

[R32N00B]

Has to be rb25 (which isn't even relevant here) cause rb26 are a finally 2 t25 flanged manifolds, can't really run one gt35 on it (rb25 is t3 I believe so you could)

[R32N00B]

*actually not finally

Damn autocorrect

[scotty nm35]

How can it be off topic, people need to realise the stock manifold isn't the restriction it's made out to be. I must admit I was surprised with this result.

I did the recent fab work on it, the car is still restricted by a hollow 3 inch cat in the 3.5 inch exhaust, return flow cooler, and the Z32 afm still holding back the 4 inch intake. There would be much more in it if the gearbox could take it... Not too laggy either imo.

[AngryRB]

That's mental response for a GTX35..

[Roy]

What sort of dyno is that and what dispacement engine? Is it an auto or manual? Seems a rather odd-amazing result.

[scotty nm35]

It's a red dyno.