Garrett Gt3582r

[nissan200sx.dk]

Hi.

Im doing a RB25DET swap in my s13. And now its time to choose turbo. Im aiming at ~500 hk in engine and was thinking of a Garrett GT3582R in A/R 0.63 (Rated at 550hk)

How will this turbo spool and response on a RB25DET?

[rb30gtr]

I am building a gtr32 for street performance and have opted for an gt35r 700hp compressor wheel with only a .63 exhaust housing, alot of tuners have said that it is much to small exhaust housing, but I wont be reving the motor past 8 so there is no need for more flow on a 2.6ltr motor for what I want it for.

If you are running internal gate I would suggest a bigger exhaust housing but if your going external .63 would be fine. Just remember its only a 2.5 so boost will come on a bit later than you expect but make for a much more fun drive.

Its good to see you havnt opted for a giant turbo which most upgraders do.

but dont take my word im just a dumb Skyline owner.

Nothing beats the rush of a big single BOOST UP.

Good luck with the build.

[nissan200sx.dk]

Had a loooong talk with my turbo seller today. I followed his adwise on the last turbo i used.. (On my old CA18DET @ 427hk).. THE best turbo ever i tried.

So im following him again. I have bought a Garrett GT3582r A/R 0.82. (rated at 600hk) Will prob run it @ 1,5 bar boost.

Cheers

Ronni

Ny Nissan

[HypeR33]

I am getting a GT3540R (GT3582R) .82 A/R fitted to my RB25 at the moment. I am hoping that with cams it wont be boosting too late.

[nissan200sx.dk]

Kewl. Keep us updated!

But a part of me is saying its too big for the job.... 480 hk(on flywheel) ish is prob a more realistic aim for a stock internal engine.. So a 0.63 AR GT3582r would be more suited or???

[RACESPEC]

Had a loooong talk with my turbo seller today. I followed his adwise on the last turbo i used.. (On my old CA18DET @ 427hk).. THE best turbo ever i tried.

So im following him again. I have bought a Garrett GT3582r A/R 0.82. (rated at 600hk) Will prob run it @ 1,5 bar boost.

Cheers

Ronni

Ny Nissan

Ronni

If you plan on running that manifold with the GT3582R. It wont happen, the compressor fouls on the rocker cover. Biggest you can go with them is the GT3071R

PS. We have new manifolds due in, that will change this

Thanks

RACESPEC SALES TEAM

[nissan200sx.dk]

If it wont fit, i'll just mod the manifold so it will.

Also have my doubt if the turbo will fit. I have changed the angle on flange for the turbo allready.

[discopotato03]

I would not fit a .63 housing to a GT3540R because I can't see the sense in choking the hot side of a reasonably large turbo . If you have to go to this length to get the desired response out of it thats telling you it (the compressor anyway) was too big to start with . This really is overkill for a 450-500 Hp RB25 . A GT30R (700382-12) with a large 1.06 AR turbine housing could get you there with a LOT less lag and much less chance of compressor surge . Even this would be pretty laggy on a std street engine and more than capable of killing a bog std one . If I was going to use a bog std R33 25DET and had to have a GT30 based turbo it would be a bought GT3037 52T or a GT30R with the 56T compressor flicked for a 52T wheel . If you get it built new its no where near as expensive as the HKS . A cheaper alternative may be to use the REAL GT3071R like someone else is doing here on an RB20 . As I've been saying Garrett are soon releasing a T3 flanged .82 GT30 integral gate housing which may make an easy convienent package for an RB25 .

Take note of how much a GT35 turbine doesn't flow with the .63 housing . Also look at the GT30R's turbine map . I tend to think along the lines of small compressor trim/smaller turbine housing GT30R's for RB25's and similar deal with GT35R's for for twin cam RB30's . The smaller engine can't generate the torque of the 3L at low/med revs and needs a turbo that can come on song earlier to get it going .

I know its been said that large exhaust housing GT30R's can handle similar gas flows as the medium size GT35R but don't forget that with 3L under essentially the same size valves and ports the gas velocity is going to be higher so larger AR housings is the way to keep things flowing out of the larger pots .

Cheers A .

[Bl4cK32]

disco, why is the 52t better than the 56t 3037s?

i was gunna use the 3037s 56t on my 3lt...just wondering why u suggested the smaller (?) compressor wheel...

[discopotato03]

That was for an RB25DET .

I think the 3L really needs the GT35 turbine and even its 82mm GT40 compressor in 56 trim is not ideal and could have been offered in 50 and 52T as well . Its all about getting the load down on the turbine to enhance the transients . I don't want 700Hp , I also don't want to pay the lag penalty of the big trim wheel . I may be stuck with an 84 trim turbine (still researching that one) but if I give it the best chance I reckon it will be more responsive and I couldn't care less about the 10 lbs less maximum flow that is the trade off 56 to 50T .

Garrett has turbos that use the GT30R and GT35R's compressors (GT37 and GT40 series comp wheels) with many different turbine options . For example that GT37 comp wheel is used with their GT37 turbine which is 72.5mm diametre ie 76mm comp 72.5mm turbine . The GT40 comp is offered with their GT37 turbine or their GT40 (77mm) turbine . Interestingly these diesel turbos tend to use smaller trim compressors of the same family than their ball bearing cousins . I think Garrett may have had more faith in the BB/reduced friction/faster spool school of thought than possibly was ideal . HKS obviously knew and speced many of their turbos for power and response - sound familiar .

The bottom line is you may be restricted in your type and trim of turbine but compressors can be changed . The right sort of replacement can reduce the turbines negative atributes .

Cheers A .

[nissan200sx.dk]

Disco:

Thanks for your reply. have really got me thinking. So a GT3076R in 1.06 trim is my best option for a new turbo. My RB25DET have had a head port, and portmatch. will soon be follow by cams and adj. pullys.

Here is the info from my dealer.

Part number: 714569-0001 (

~ 550 hk

GT3076R

Exd: 55mm

turbine: 60mmGT30

A/R:1.06

Trim: 84

Ind: 55mm

Komp: 76mmT04S

A/R: 0.7

Trim: 52

Is this the turbo i should get? Can still change the turbo to this one. :-)

[discopotato03]

I would avoid it like the plague , note the specs say TO4S compressor .

There are only three off the shelf full sized GT30 turbine based turbos worth having for petrol engines in my book . They all use the same 60mm 84 trim UHP turbine so its only the compressor/housing that changes .

From small to big ....

1) GT3071R - Uses GT35 71mm compressor in 56 trim . Usually has .50 AR TO4E comp cover .

Uses cartridge or CHRA no 700177-23 or -5023

2) GT3037 - These are available from HKS and use the GT37 76mm compressor in 48 52 or 56 trim . The

3) GT30R 56T version you can buy through Garrett as the GT30R . You MUST specify turbo no

700382-12 if you want the same cartridge and wheels that HKS use in their GT3037 56T .

To get the 52 trim GT37 compressor you would need to buy the HKS or get someone like

GCG to make one up new which I think would be cheaper .

The cartridge ID tag numbers to look for are 700177-0007 for 56T or 700177-0006 52T .

As for exhaust housing AR numbers many see them as being small medium and large (.63 .82 1.06) . Its really to do with running the turbine /compressor rotating group at the right speed to make the desired airflow . For example HKS generally specify a smaller AR turbine housing and compressor cover for the GT3037 52T ie .73AR turbine housing and .50AR comp cover , .87 and .60 for 56T .

My gut feeling is that a 1.06 exhaust housing would be a bit laggy on an RB25DET , I reckon the .82 housing on the 52 compressor trim version would be nicer to live with and better suit the std gearbox ratios . If they're still available the T3 flanged HKS .73 housing could be worth a go .

Cheers A .

[nissan200sx.dk]

Disco:

It has to be a Garret charger, and a std item. Dont have money to get it modded. So if theese two demands must be met my best option would be the 480hk GT3071R unit? (A/R 0.86) And take this into account also.

I'm used to a custom built T3/T4 500hk turbo (Exhaust A/R 0.86 - Intake A/R 0.70 dunno about trim or wheels....) On my old CA18DET engine. It kicked (full boost) in hard @ 4100 rpms. That setup was not too laggy, and just dont wanna go worse on my RB25DET engine.

Am not very good at all those trim specs.. I know my A/R's but not all the different wheels and trims.

Part numbers dont seen to be the same as the one i can get a hold of here at my dealer also.

So in plain english which turbo would you get if it was you? The flow maps ive seen @ garrett, I think, that the GT3076R in A/R 1.06 would be best suited when running moderate boost (1.5 - 1.6 bar). But then there is the laaaag. The A/R 0.86 wont even reach the A/R 1.06 @ 2 bar boost... (Flow wise) But "how" much lag will the 1.06 have in real life...? Compared to the turbo setup on my little 1.8L CA18DET