Gt30 On Stock Manifold?

[STATUS]

dont think that the HKS housings are the same as the garret ones... they adefinately arent. i have a box of hks 2835 rears and some 3037s one from my old 180 when i was mixing and matching that i will hold onto till i need them.

[discopotato03]

Cubes not 100% but pretty sure the Pro S GT3037's had a unique port shrouded compressor cover in 0.50 A/R though not sure if it was based around Garretts T04B or T04E comp covers - probably the "E" type . A good chance that was to help clear the exhaust manifold and pull up a bit more bottom end .

Actually the 3037 and 2835 Pro S turbos appear to have almost the same housings . You have to be a bit careful with the IW turbine housings because even though they look like the same castings they were machined on different turbine centres . By this I mean the larger GT30 (60 x 55mm) turbine would have broken into the Pro S housing wastegate flow path had they not offset the cartridge in the casting . I think the port shrouded 0.60 A/R T04E comp cover similar to the one on the GT3076R comes std on HKS's GT3037S .

With GT Pro turbine housings I've never seen or heard of any with T28 flanges on them , the ones HKS used for IW GT2835's for SR20's appeared to use T28 flanged GT28 housings - the dreaded GT28 housing bored out for the cropped GT30 turbine scenario . The Garrett version according to ATP speak is called GT3071R WG or waste gated . I wouldn't bother with any T28 housing version of those turbos - low turbine efficiency and lag city . Cropped or std GT30 turbines only seem to work properly in a GT30 based housing , so if your using a 2835 that means the matching HKS Pro S housing . For a GT3037/GT3076R the propper Garrett GT30 IW or EXT gate housings are now availabe or similar things through HKS . Only HKS make dedicated T28 flanged GT30 turbine housings .

Cheers A .

[Cubes]

The HKS .6 port shroud comp cover is definitely different to the Garrett versions from what I've seen. I haven't looked past in to the side of the inlet snout to see if the inside is essentially the same or not.

I remember seeing HKS style inserts on ebay for the Garrett .6 port shroud comp cover, the comp covers have the grub screw holes for it so it all fits like Garrett intended it to.

So if any ones got a HKS3037S try to get a pic of in between the inlet funnel/snout and the comp covers outer.

Hard to explain. Pic attached.

I'll say it again so it doesn't get lost in the thread.

For those with the GT30 .6 IW garrett rears; they work well but you do need to follow a few simple rules for them to do so without creeping.

The hardwork has been done; run the larger flapper with a good split or bell and it works perfectly fine. Good split being one that isn't just a 2" pipe but one that has the pipe massaged out to meet the edge of the flange as to prevent the wastegate flapper partially blocking the 2" pipe.

You can see where the insert slides in to the inducer and the where the screw holes are to hold it in position.

I would be really interested if there's a seat of the pants or dyno difference with the smoother neater inlet. If they are still around I might grab one as they are only $100-150 odd. Bit of a back to back. Really haven't got anything to loose apart from $150.

[Wheezy]

HKS3037ProS were released with the port shroud .6 comp cover. Port shroud helps prevent surge.

Like I said, it was changed over. And I know it was a T04S cover on the turbo, and certainly was the T28 flanged exhaust housing.

Funny tho, this thread is quickly becoming a pissing contest.

[STATUS]

With GT Pro turbine housings I've never seen or heard of any with T28 flanges on them , the ones HKS used for IW GT2835's for SR20's appeared to use T28 flanged GT28 housings - the dreaded GT28 housing bored out for the cropped GT30 turbine scenario . The Garrett version according to ATP speak is called GT3071R WG or waste gated . I wouldn't bother with any T28 housing version of those turbos - low turbine efficiency and lag city . Cropped or std GT30 turbines only seem to work properly in a GT30 based housing , so if your using a 2835 that means the matching HKS Pro S housing . For a GT3037/GT3076R the propper Garrett GT30 IW or EXT gate housings are now availabe or similar things through HKS . Only HKS make dedicated T28 flanged GT30 turbine housings .

Cheers A .

T28 flange non internal gate are they ones i have at home... IW is gay:P old pic of car with real gay autosalon winning clown paint and 3037s.... tried 2 housings on the rear with the 3037s and then swapped it out for a 2835 and tried two housings on it.

and yeah i agree totally about how poorly matched the t28 versions are of garrets gt30's.

as far as the HKS inlet sleeve goes i cant see it being as important as the rear, the results i have experienced on my own car show that upgrading the rear housing on a sr is indeed money well spent i would assume the same for a rb20 as for RB25 i cant comment as i havent done the practicle exercise.

[discopotato03]

Just to fill the gaps in . If you read my last post carefully you'll see mention of T28 flanges and T28 (actually GT28) housings . They are not always one and the same thing . Its confusing because people want to call a turbine housing by its flange size when they should call them by their intended turbine family .

Some examples are , HKS made a lot of T28 flanged GT30 turbine housings so that people could mount GT3037's on engines with T28 flanged exhaust manifolds . There's absolutely nothing T28/GT28 about those turbochargers - except the mounting flange .

Another is the T3 flanged GT25 (nowdays known as GT28) turbine housings found on HKS's GT2530/GT2540/GT-RS turbos which are designed to be a bolt on for the T3 flanged exhaust manifolds on RB20 and RB25DET's . Again there's absolutely nothing T3 about those turbos - except the mounting flange .

You see people try to do things on the cheap like buy a 2nd hand T28 flanged GT3037 and use an adapter to bolt it on a T3 flanged manifold . It never works as well as the properly designed for the job part .

Garrett and HKS are both guilty of using T28 flanged GT28 family IW turbine housings as a cheap convienent way to get 2835/3071 turbos - with their cropped turbines - onto engines like CA18DET's and SR20DET's . All they do is bore their existing GT28 turbine housings out further inside to take the foreign modified GT30 family turbine . The propper solution would have been to develop and manufacture a housing like the T3 flanged GT Pro S one but with a T28 flange and the Nissan style dump pipe flange . They took the easy way out because making one off specialised turbine housings is very expensive particularly when they are cast in Ni Resist or some other high Nickel content iron alloy to withstand petrol fired EGT's .

For all sorts of reasons any really serious SR20 will have a T3 flanged exhaust manifold and T3 flanged turbine housing designed for the desired turbine family ie GT30 .

Nissan designed the SR20 for fairly compact engine bay apps and thats also why the turbocharger system is compact itself . In its (arguably) highest state of factory tune (GTiR) it still had a T28 but it was a large series T28 and had a better flowing exhaust manifold than the S13/14/15 or U13 Bluebird .

Back to RB's and R32/33's the way to go is either Garretts GT30 turbine housing in IW or external form or the similar equals from HKS . If you short change the conversion by using some cheaper bastardised turbine housing then you risk the success of the whole thing .

Cheers A .