This one looks slightly different although it's definitely the same construction, this is second hand so someone else had already grabbed the turbo and wastegate. There's a gtx3582r I'm looking at with a .82 turbine which is probably somewhat appropriate. I got the impression that this sort of manifold is better suited to higher power builds (perhaps the stubby HKS cast one would have been better) but the price was right

The only manifolds on their website otherwise aren’t listed specifically for the FD chassis. Did your friend have it on an FD3?

yes it's listed as part of a kit only (the one I posted above), described as an "FD single turbo kit". they don't seem to list the manifold separately
It's obviously similar construction to the one you posted earlier but your picture has a strange long runner from the rear rotor swooping underneath. I wonder what the logic is behind that

Sorry for glancing over it. Yeah that looks like the same one to me.

Likely a combination of chassis fitment and wastegate priority by the looks of it.
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I think I may have made a mistake in grabbing this turbo-less package

The downpipe and manifold seem to be specc'd for a very large turbo. The manifold Vband is 3.5" (largest OD reading on flange) and the downpipe is a 4.21". It's weird, so many turbine housings are just listed as being "dual V-band", without them listing the actual V band size.... pretty useless really

Anyway it seems the 3.5" in 4.21" out limits me to GT40 or GT42 sized frames, unless someone's seen one for something smaller? There's a 4082 for sale at the moment which would probably do the trick, if I could get a housing for it...

Don't fall for the sunk cost fallacy.

If you want low power you could get away with a GT30 /clone or BW SX257 or similar, going several frame sizes larger with a non divided manifold will end in frustration, it will be like driving an old 2 stroke bike set up with a tiny powerband.

yeah I'm starting to think I should abandon the PAC gear, as nice as it is. I don't think there's any smaller sized turbos available with housings that would fit the setup. And adapters will throw all the alignment out. so there's an expensive lesson learned but maybe I can move it on

I'm with Slides here. I'm no expert on manifold design, reading dyno graphs, or turbo sizing, buuuutttt..

What I do know about those things, and with what I know about PAC, this thing screams "drag race application." Judging by your power goals, I would assume your are looking for a fun, safe, street car. And with that manifold, I think you'll be chasing your tail to achieve that. I'm sure you could turn that manifold around to a drag race guy and get your money back out of it.

Since your goals are pretty common (again, I'm assuming your goals here, so I may be wrong), I don't think you need to over think the setup. There are even some "off the shelf" packages (manifold/turbo/downpipe) available. The Turblown stuff is tried and true; look into Howard Coleman's manifold design threads; I've seen companies selling kits with the Artec manifold. [I personally don't think the Artec manifold is the way to go, but there have been people who have run kits with it and had success.] I know I'm not answering your turbo question here, but I do think everything starts there. It's why several people have included the manifold they are using in their answers.

There's no "best" on a rotary, from my experience. BUT there is a 'best" for your application. Do you want boost control or boost response? Do you want your 3-400 hp early and linear or do you want it on the top end?

Also, during your research, keep in mind: turbo 'ratings' are going to be based on piston engine output. Rotary output will be significantly less for that turbo. There are threads on those calculations on here to help you better understand those advertised numbers.

yeah I've accepted it was a misstep. I really just jumped at it because I knew it was a recognized brand, and it was very cheap
I don't want to put it back up for sale straight away because it'll make it obvious to everyone that I cocked up lol
plus not too many buyers around for this stuff right now I think

back to plan A, the HKS "special set up kit", still hoping that I can find a second hand one...

there are like 2.5 kits,
14020-AZ001 is just the manifold and wastegate
14020-AZ002 adds the downpipe, turbo oil lines and all the gaskets
then you can add the GT3 turbo to that

if you're looking at older stuff, like a T04S kit, it has a cast manifold which is identical externally, but different internally

Instead of selling the PAC kit, consider pairing it with a G35-900 Pulsar. It’s a budget-friendly setup that’ll be perfect for a low-power FD build. And if you ever get bored or embarrassed after getting smoked by a Fiesta or Polo, you can always turn up the boost for more power. Low power is fun at first, but it gets old quick on the street.

the problem I have is that this PAC kit seems specifically designed for a G40 frame turbo, the smallest of which is the G40-900 which I think most would agree is too big for what I want... fitting adapters would throw everything else out of alignment. so I would have to try to find a G35 compressor with a G40 hotside (not sure if that's even possible?) or start cutting flanges off and sleeving everything down (probably pretty horrible for flow)

I mean all of that is overcome-able with enough modification, but that leads us back to the sunken costs fallacy

the great news is I'm out of money so lots of time to think and save

Agree and no point in throwing good money after bad!

Get a 7670 iwg kit from Turblown. It will all fit, work well, easily hit your goals and have room to grow in the future with more boost or a larger turbo. You can keep pretty much everything else stock at a bit over 300whp.

Or just hold out for someone selling a used kit here

talking of, anyone have a 7670 they want to sell? Thinking of slapping my spare motor into something really small and light, something a 7670 would already be way too much power for

don't be shy let's hear about it. I have a freight forwarding account in CA if you don't want to deal with shipping internationally, if I like it

OK so I continue to blunder stupidly around the single turbo world, shedding cash and disregarding advice

I bought an HKS "special set up kit" which is designed for a HKS GTiii-4R. Then I did some reading and found out (supposedly) that the GTiii-4R is just a Garret 3582 with a coat of makeup. OK I thought, instead of buying the $4k HKS version, I'll save a buck and get the Pulsar knock-off. I went with the "compact" version as it had a slightly smaller compressor for the same sized turbine, if I recall

Then the Pulsar agent calls me and says "are you sure this is what you want? we don't sell many Compacts". I told him the car I had and he upsold me to a Pulsar 6262. I foolishly thought that a T4 was a T4 and that the thing would fit (which in retrospect was extremely naive) anyway, the 6262 fits the T4 flange of course but nothing else lines up. the v-band outlet is the wrong size and is offset differently so the downpipe sits differently and the wastegate joiner pipe won't align with the manifold

So I either modify what I have, or bite the bullet and buy the GTiii that the kit was designed around (and there's two different a/r versions available, would they both be interchangeable? or do I need the specific one that the kit was designed around?) or do I take the middle path and go back to a 3582 equivalent and hope that it fits? I kinda don't want to go back to Pulsar as they so handily upsold me to something that doesn't fit, and then weren't interested in taking it back

The HKS turbos have several small tweeks and special castings that specialize them to the application and set them above the base garrett turbos.

Poor results with the base garrett t04z versus the hks t04z in regards to spool back in the day. Peak power was the same.

I wouldnt count on anything but the specific hks turbo being a straight bolt in with the hks set-up kit you bought.

He asked if you were sure or not, right?

Because they aren’t likely going to know all the details of some obscure, specialized Japanese turbo kit from way back when. Perhaps you assessed it more accurately at the beginning of the post
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i believe my HKS turbo is just a combination of parts that we not otherwise offered together. so its really similar to an Isuzu truck turbo, but with a different center (16mm Water vs not)
there could also have been a quality difference too, someone could have spec'd a closer tolerance.

there was also a T04R Cutback which was a T04R with a clipped turbine wheel

HKS specialized castings I knew of was T04Z and T51R and T51R KAI compressor covers and exhaust housings with tailored AR.

HKS is cast into these, so not just a mix of garret parts on those flagship turbos.

But HKS used garrett turbos and parts for all their kits (example tje RX-7 T04E and T04S kits used straight Garrett turbos as far as I know) like Greddy used Mitsubishi.

HKS GTIII is obviously specialized.

herw are dimensions to check if something else fits same.

i found the instructions for the T04Z Kit and there are a few things in the kit that would make a difference. most crucially there are some heat shields (plural) for the lower intake.
it also had some brackets so that you can keep all of the emissions stuff too

Has anyone actually bought the HKS kit with the GTIII-4R Turbo? It's a very cost effective solution here in Australia but can't find any Dyno charts or reviews online anywhere.