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Discussion Starter #1
As above, ive done a lot of searching, a lot of people seem to have no regard for it due to its low power output but i love its quick spool and it has enabled me to annihilate a few mildly tuned b series.

The turbo needs a better manifold.

If anyone knows where i can purchase an off the shelf ss upgrade it will be here, is there any pattern of other turbo that's suits a td04
 

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It is a T25 flange, which kinda limits the "off the shelf" options for the D series. You could get a T3 manifold and then get a T3 to T25 adapter. Or just have/DIY a manifold custom built.
 

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I have used an ebay manifold for about 3000 miles now. NO issues! The gasket has even lasted this long. It was 40 bucks, so even if it does crack a month from now, just spend another 40. Log style for me
 

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the artist formerly known as drexelstudent11
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if you're using the greddy setup, the chief restriction isn't the manifold or the turbo, it's the cast elbow and 2.25" downpipe. You can port the elbow, and KTeller makes a 2.5" downpipe that bolts up.
 

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Discussion Starter #6
I have already had a custom 2.5 downpipe installed, was just reading there that a t28 flange is same as t25 and td04 so that opens up another avenue.
 

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From what I've read, not first hand experienced, the only manifolds people will trust that is "off brand" would be a cast iron manifold. Not a whole lot can go wrong with them.
 

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I have already had a custom 2.5 downpipe installed, was just reading there that a t28 flange is same as t25 and td04 so that opens up another avenue.
Actually the Greddy 15g is a td04 turbo that has a T25 exhaust housing. The T25 flange is different from td04 flanges, the most common being DSM and WRX flanges.

A tubular ramhorn or "mini EL" manifold may offer gains of 10-20whp depending on your current power level, but shouldn't be your first change. The D16 isn't a magical unicorn by any means and won't respond that well to high-flow parts as much as will respond to increased boost. The best thing to do is get a 3 or 4 BAR map sensor and increase the boost to 15-20psi. If you have cast pistons and/or stock rods, neither extra boost nor a tubular manifold is recommended. The cast manifold & stock map sensor can allow for enough power overwhelm your engine's parts.
 

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Discussion Starter #11
I whipped out air con three years ago, being from Europe it doesn't get as hot over here compared to America.

I have a 4 bar map sensor, but the greddy manifold and elbow us definetly holding back my power after 5500rpm, in going purchasing a cast ebay manifold with longer runners and a get a stainless steel elbow manufactured to replace the useless cast elbow so that i can at least see 1 bar being extracted from this little 15g rather than the current 0.7bar.

I understand yes build engine for more power but at the moment this is not an issue
 

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I would vote to go bigger on the exhaust,

I have T25 and couldn't make over 10psi on my first exhaust (2.5"), cut muffler off and saw the 15psi that I wanted.

Finally got tired of the drone on the highway and went 3" all the way w/ 2 long glass packs, have seen over 20psi ( but keep it a 15psi). It gave me better spool and better top end.
( sitting at 250hp right now from the small T25!)

I'm using a t2 cast mani too(ebay special)
 
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