My Custom Turbo Plans

[Guest INASNT]

Ok instead of spending $5000 on a new hks 3037 turbo, i can get a melbourne garrett guy to make me a turbo using all garrett parts to the same spec as the hks 3037 or 2835. My mechanic has a spare 3037 sitting on his bench not doing much at the moment and he said i could borrow it and give it to the garrett guy to pull apart and make my turbo to the same spec as the 3037 but keep it internal gated and match the flange and put new braided hose oil and water line, so i can fit it back to my stock manifold all for around $2100. This way i can sell my turbo for X of dollars. I was going to go the gcg updrade but that way u have to send them your turbo and they modify it for $2200.

Now i am thinking will the 3037 spec housing be 2 big to fit mount? should i get a custom manifold made and high mount to display it and look full sick when i pop the bonnet?

Now the main part being will the car be easy and have a nice power curve? I am aiming for around 250rwkw +, and have all the rest of the parts i need preety much sorted out, i was told it would make full boost around 4000-4500rpm when running around 16psi!

Your thoughts?

[raist60]

Sounds interesting....

Few things number one no it prolly wont fit onto standard manifold. You can just get a spacer made up and some longer studs. Simplest way, im still running standar manifold and put down enough power.

What kinda specs are you gonna go on the turbo? The main difference i see between a garret and an HKS is the actual housings, i dont think garret would be able to make it the same as a 3037.

Why dont u just go a GT30 or something similar from garret they are just as good and you wont be messing around mixing and matching turbo bits hoping that it will turn out ok. I did that and the car ran like shit until i tried again.

Second thing that i know is gonna be an issue for you is there is absolutely **** all decent size turbine housings with internal gates.

[Guest INASNT]

There is a hks 3037 with internal gate u can buy from hks!

hks basically buy the garrett turbo and modify it and stamp their name on it!

I might look into getting a gt30 and have it modified to fit my manifold. This guy makes them usually from scratch to whatever spec u want

[raist60]

Im aware of the HKS internal gated housing. Call up any aussie turbo joint and ask them the availability on ANY brand of T3 Internall gated housings over .60 A/R....

GT30 is a T3 plate and will bolt straight on if you have spacers. The GT30 centre cannot be built. It comes complete from garret and then they just bolt on the appropriate housings (after prepping)

[Nismodified]

HKS do get their turbos from garret, but in the end, you wont get the same results as the HKS unit, with all the money they put into there R&D.

Im not saying this 'melbourne garrett guy' cant get the results your after, but it may fall short of the genuine article

[Guest INASNT]

Originally posted by Nismodified

HKS do get their turbos from garret, but in the end, you wont get the same results as the HKS unit, with all the money they put into there R&D.

Im not saying this 'melbourne garrett guy' cant get the results your after, but it may fall short of the genuine article

for the thousands i will save i dont mind loosing the poofthints of power i will loose. It sucks that hks dont advertise their turbo specs either.

[Jay95R33]

Sounds like a good plan - just make sure you get ALL the spec's of the new turbo, cause if it works well then I'll copy it

What sort of boost and power are you aiming for?

J

[Guest INASNT]

aiming for 250rwkw on mild boost and around 280rwkw on higher boost

[raist60]

250 rwkws about the limit of stock bottom end reliability wise, also your AFM peaks at 250.

I can tell you now that a gt30 (500hp) will definitely get 250rwkws. Speaking from experience. But that was with an external gate.

[grepin]

What previous experience?

GT30 external gate ona R33 GTSt was it.

What power did it make and when was it at full boost.

Stock injectors and internals?

Just a GT30 or was it like 3040 or something?

Actual experience is valuble info.

Thanks

[Guest INASNT]

Originally posted by raist60

250 rwkws about the limit of stock bottom end reliability wise, also your AFM peaks at 250.

I can tell you now that a gt30 (500hp) will definitely get 250rwkws. Speaking from experience. But that was with an external gate.

i have already got z32 afm, pfc, 550cc injectors etc etc etc planned.

And if the engine blows i will put in forgies, short penned rods, nitrided crank, ported head etc.

[Steve]

Garrett make the turbos for HKS, but the specs are only available to HKS, so as previously mentioned, the garrett copy wont be quite the same.

the specs for the turbos are here: http://www.hksusa.com/categories/more.asp?id=1092 but they dont publish the compressor maps. the quoted hp rating on the above chart is at 1 bar and is approx 10% below actual figures - thing to remeber though is that the figures are purely for the turbo, and dont allow for things like intercoolers and pipework etc. But it sould give you a guide.

If you were to look at the 3037 kit that HKS do, the turbine AR ratio that is used is 0.87, so close to that would probably be fine.

Realistically though, you could get a HKS 2835 direct from japan, brand new, in whatever spec you wanted and it would probably cost less than 3K. The 2835 should easily make 250rwkw. To give you an example, a guy I know with an RB20 is making 230rwkw with a 2530 on 1.2 bar with FMIC and 3" exhaust and pod - everything else stock. It comes on boost quite early, and it will shread the tyres in third just by popping the clutch (hes into drift) With a 2835 on a 2.5L you would get alot better mid range too.

Just thought I would help add to the confusion:)

[Guest INASNT]

steve

but with 2835 i would need to add another 1g for a custom manifold!

[raist60]

Grepin:

Stock injectors NO (RX7 550ccs)

Stock Internals YES (But not for long)

I bought a GT30 Front housing (0.70 A/R)

GT30 CHRA (Dash 11 Core)

and a ARB 0.82 A/R Turbine Housing

Then threw it all together.

This turbine housing has a large flange built on to the top of it so you can pipe an external gate onto it without having to **** around with manifolds. I went a 45mm PSR wastegate.

This setup on my std rb25det pulled 250rwkws at 17 pounds. In terms of max boost, the turbo can run up to about 25 pounds whilst still being efficient i believe.

[Steve]

INASNT, the 2835 uses a GT25 inlet flange on the turbine, so just and adaptor, or the 2835Pro has a T3 inlet flange on the turbine so just bolt straight up.

[Guest INASNT]

Originally posted by Steve

INASNT, the 2835 uses a GT25 inlet flange on the turbine, so just and adaptor, or the 2835Pro has a T3 inlet flange on the turbine so just bolt straight up.

it would be near impossible to get a 2835pro second hand or new for around 4k

PS.

I wanted that clutch dammit

[lowlux]

has any1 priced up the turbo on the new BA xr6 as they are a gt30/40 turbo with internal gate,and probably a t4 flange????

[turbomad]

I had a look at the comp housing on the XR6t and it was only .50A/R, which I thought was strange considering the gt28 I want has a .70A/R, the next time I see one on a hoist I will check the A/R of the turbine housing, if it's only .64 as I suspect it may very well be a good upgrade for a RB25, however I doubt we'll get any cheap used ones as there rumoured to be able to make 300rwkw on the XR6 so not too many people are going to need a larger turbo.

[Al]

Originally posted by lowlux

has any1 priced up the turbo on the new BA xr6 as they are a gt30/40 turbo with internal gate,and probably a t4 flange????

My mechanic is in the process of fitting one of these to a R33. From what he told me, the turbo has been designed to be very restrictive. They had to change both the exhaust and comp. covers to free up the air flow. Not worth buying one, then having to modify it.

my 2c

[Zensoku]

From what he told me, the turbo has been designed to be very restrictive.

Sorry, incorrect.

Ford has setup their XR6T's inlet piping to be restrictive on purpose, not the turbo itself. The Ford engineers actually detuned the performance of this engine, because they didn't want their new engine to outshadow their new "Barra V8's" which offered more torque and power than the XR6T & weren't even released at the time.

I would just like to point out that the XR6T uses a "high flow" style Garrett GT ball bearing turbo. It uses a GT40 compressor housing and a GT30 exhaust housing, hence the small A/R you quoted. Obviously this would aid in this large turbo to spool up a little earlier in the rev range. Ford originally tried the GT30 off the shelf from Garrett, but found that it ran out of efficiency at high RPM/load. This is interesting, because, these XR6T's run very conservative boost from the factory, not enough to notice the "urge" of g-force associated with Jap turbo cars. I would be doubtful to the results of trying one of these turbos on a RB25DET, as this turbo was designed for the exhaust flow and engine volumetric efficiency of Ford's 4.0L engine.

If you get a turbo builder to custom build a turbo, you will NEVER get the exact same specs as a HKS turbo, as these are custom built by Garrett/Honeywell to HKS's own specs. HKS don't actually modify these turbos at all. They simply show all their engine dyno graph, flow bench tests to Garrett and get them to engineer different compressor and turbine wheels which fall into an efficiency range that HKS would be happy with.

A GT turbo from Garrett Australia will be alot cheaper than a HKS item, but will be just a bee's dick less in efficiency and power compared to HKS turbos.

HKS turbos should be fairly cheap to get direct out of Japan anyway.