Time For A New Turbo Set Up!

[R31Nismoid]

I'm thinking the twin 3037s will be a bit of a goer with the .74 exhaust housing.

"We're looking to make 450awkw with out too much boost yet trying to have as little lag as possible."

a turbo capable of making 300kw at the rubber (or more) on its own, isnt the best choice for 450kw if you want response

[discopotato03]

I'm glad its not my money ! From other peoples hearsay the TO4Z would be a straightforward single solution and far cheaper than twin turbos - particularly twin HKS's .

If you want more or don't like TO4 P trim turbines there are a couple of alternatives in the US , firstly the GT3567R From Full Race.com and secondly the 4067R from I think Precision Turbo .

The GT3567R is basically a GT35R with the same compressor (TO4R 84mm 63T) as the TO4R/Z turbos .

The GT4067R is a GT40R with the same compressor as the one above . It also uses the large TO4 flange as can the TO4R/Z .

I think either of these would be more responsive than a GT35R with either the 94mm or 102mm compressors from the GT42R/T51R KAI/SPL . If an 84mm big trim compressor can push the air you want why chase a larger 94 or 102mm one ?

Actually just had a sticky at the maps - a GT35R might just about get there depending on turbine housing a/r and drive line losses , the 3567R should romp it in .

Cheers A .

[S3_Girl]

You will be very lucky to get more than 410rwkw out of the .82

housing Gt35r, the 1.06 woudn't make to much more,

So To4Z or 94mm exducer Gt42., unless you use something from Precision inbetween

Judging by what they say in the US, the twin 2835 kit sounds laggy for the power it

makes.

cheers

darren

[MattSR]

The most I have seen a GT35R make is about 430rwkw and that was the turbos choked flow.

[Roy]

Who are Hypertune. A number of years ago all Hypertune cars were actually built by BD4s which would mean that odds are any plenums etc if not HKS would be done by Plazmaman...or have things moved on or is there a different Hypertune???

[discopotato03]

Fair enough , the map I was looking at shows ~ 62lbs airflow at ~ 23.5lbs boost . Output would vary with different engines , tuning , state of tune .

The 7/14 blade GT40's 88mm compressor map shows about 68lbs flow and the word is that the 84mm TO4R does 75lbs of flow . My preferences only , 88 GT40 more blades than is good for response and turbine efficiency + requires huge comp cover , 84mm TO4R wheel pumps more air and can use more compact comp cover - AND 6/12 blades good for reasons already mentioned . Everyone that uses TO4Z's (same comp) can't sing enough praise for its compressor and its non surging characteristics .

Cheers A .

[600hp]

I'll just straighten the whole Hypertune scene out.

Hypertune used to share the same facility as BD4's, they were never the same company. BD4's never worked on any of Hypertunes cars, where as Hypertune did a lot of work on BD4's cars.

As for Hypertune i get a lot of work performed by the guys down there at Taren point.

They produce all of their own gear using CNC mills and CNC mandrel benders.

I'm sure they won't mind if you go round to their factory to see what they do.

As for 3037's being a bit laggy has anyone got experience with these turbos?

any help would be great.

Cheers

[R31Nismoid]

since you seem to have missed the point of a lot of people

http://www.skylinesaustralia.com/forums/in...c=34855&hl=3037

If ONE 3037 can crank over 300rwkw (just one thread of many above as the example)

Then TWO would get you into the 550-650rwkw mark.

You goal is 450rwkw, get better matched single.

You asked for response, do you really want response?

If you did you wouldnt be thinking two monster twins.

[R31Nismoid]

or this aswell

http://www.skylinesaustralia.com/forums/in...dpost&p=1315401

[NXTIME]

I agree, if you want ultimate response, go the big single with moderate cams. Then again, more info is required on your engine specs: capacity, cams, etc

2835's are not as responsive as say 2530's or a GT35 or TO4R/Z unless you have a 2.8L or RB30, and even then they will still have a significant amount of lag. With the 3037S's they will only be laggier and less responsive.

Disco's suggestions sound very tempting also as improved response can be had with minimal power sacrifices.

You could make things simpler by going for GTRS's.

[CruiseLiner]

one more vote for the hks t04z, join the always growing t04z fanclub, haha

[600hp]

When people talk single 3037s they normally have a large housing like WRX i know wich has a 1.12 ex housing

where as for a street GTR we would run twin .74. i don't want to run big boost either that why i want a slightly larger turbo.

I'm looking a t running about 15-20psi.

[NXTIME]

You wouldn't be running any more than 20 psi on pump fuel on the street anyway. The most used housing on a single 3037s would be the 0.87 for the street anyway. 1.12 would be laggier for a street car. Twin 3037S's will make 450awkw quite easily on 20 psi.

However, similar power can be made using a single T04Z.

Question is, how much response do you want to sacrifice?

[BU5TER]

Can't really believe this hasn't been asked

what will the car be used for?

Dyno/boasting/something to talk about

Drag

Track

Street

as the midrange you'll get from the big twins at low boost 20psi compared to smaller say low mounts or single turbo such as t04z at the same boost will easily make them faster then the big twins that aren't running efficiently

[600hp]

Its normal use is just for driving to work and so on.

but for us to make 367kw we have to run 27psi

i know the turbos will have more lag but as someone else said

20psi on those turbos should make around 450kw.

[NXTIME]

Its normal use is just for driving to work and so on.

but for us to make 367kw we have to run 27psi

i know the turbos will have more lag but as someone else said

20psi on those turbos should make around 450kw.

<{POST_SNAPBACK}>

Have you seen this thread?: http://www.skylinesaustralia.com/forums/in...opic=93880&st=0

Plenty of different RB26 cobinations and their respective graphs.

If you are going to use this car for normal everyday use, why do you want 450awkw on 20 psi with minimal lag, especially using a high mount twin set up? It doesn't sound like you want it for drag or racing use, unless you plan on taking it for a blast every now and then. But you have specified very high power with quite stringent parameters. For an every day street car, 450awkw is lethal. I dont think that it is achievable unless you term "minimal lag" as being 5K+ as you won't see much boost below that with twin high mounts (3037S's).

It will also cost you almost twice as much to achieve it with a twin set up than a single.

[R31Nismoid]

i've been trying to say that

[600hp]

I know lag is a big thing, but if power hits at 5000rpm thats fine beause we will be reving it out to 9000rpm

The guys down at Hypertune will be performing all the work on the car,

They have been in cars with these turbos, and asure me with the right tune make 800hp no worries.

[R31Nismoid]

450rwkw is not 850hp

Do you want 450rwkw or 850hp?

If your rev'ing the guts to 9000rpm, then i'd say drop back 1000rpm and use boost.

IF you've got a motor to handle big revs, it'll handle a mild amount of boost

[discopotato03]

If you decide to use HKS's GT3037's I'd give serious thought to using the 52 compressor trim version (cartridge no 700177-0006) . They work out to be a better balance of compressor load to turbine power and if the SR boys can get nearly 400 Hp out of them in single form its more than you probably need in twin form . Also from memory HKS did a 48 compressor trim version but I don't think anyones ever seen one . HKS do T28 flanged housings for them in .61 and .73 a/r as well so my guess would be .73's .

It still seems a lot of turbo for the 600 odd Hp , what do twin 2530's get you if the manifolds and turbine housings are cleaned up and good dumps and cams are used ? Would be a lot cheaper and use a bit more of what you already own if its enough .

Also glad its not me paying for the driveline to support it ...

Cheers A .