New Garrett 3071R experiences..

[discopotato03]

Guys that HKS GTRS is really just a GT2871R with a 52 trim compressor . Comes on song at 3700 on an SR20 ? My US SR contacts claim the larger HKS GT3037 52T spools at 25-2700 rpm and would easily out gun a GTRS . The 3037's are using the T25/28 flanged .73 ARR HKS GT30 exhaust housing and usually the RNN14 GTiR exhaust manifold .

That GT3071R at the GCG site is not the same as the one from ATP turbo in this string . The only way to make it work properly is with the HKS GT30 style exhaust housings . All the ones using GT28 exhaust housings are dogs - wrong type of turbine housing for the turbine .

Cheers A .

[Cubes]

Those who have interest in the gt30 rb or vg hybrid.

There's a thread floating around where some one had a vg30 turbine housing machined up to suit their gcg highflow. If I remember correctly they went from 240 something rwkw to 270 something rwkw.

I plan to do similiar using a GT30 700177-7 CHRA and .6 Comp cover machined up in to the VG30DET/R34 turbine housing.

Hopefully push 18-20psi through it.

Or... there is also the GT30 700177-14 CHRA that runs the larger comp wheel. The only issue with this is I am unsure if there is a .6 comp cover available for it. I really don't want to run a .7 due to clearance issues.

Edited October 17, 2005 by Cubes

[|PRESA|]

Why is choosing a turbo so hard??

I don't know a lot on turbo figures and everyone has something different to say - GCG say the turbo would be good for an RB25DET with RB25 turbine housing.

- discopotato who seems to know his stuff doesn't suggest it as a good combination

- My tuner can't see anything wrong with the GT3071R and can get me a good price including the flanges and adaptors and everything

lol it's all too hard.... *confused*

[wolverine]

why not a simple hi-flow from GCG? tried and true and bolts straight up.

[Lithium]

Now that we know someone has made 250kw @ wheels with a GT3071R on an RB20DET (other thread) with full boost by 4000rpm, we can agree that the GT3071R is a good unit?

I have a VG30DET housing, this can be machined out to fit the GT30 turbine wheel happily enough - and the GT3071R comes with a .5a/r TO4E compressor housing.... shouldn't this combination be able to fit down low easier than the GT30R low mount described in that other thread, and provide some awesome performance for an RB25DET?

It sounds like the GT3071R-WG (w/ cut down turbine) was a good combo for the RB20DET.

[|PRESA|]

Hmm I'm starting to look more into a GCG Hi-flow now..

I just want my 250rwkws dammit!!

[The Mafia]

well, I currently am running a GT30r with a VG30 housing machined to fit.

Currently running 200rwkw at 7psi, lol. Still waiting FOR MY f**kEN INJECTORS.

lol anyway, I Will be sure to let you know how this goes.

The comp Cover is a .7

[Cubes]

hows it feel on 7psi? N/A like?

[psybic]

On an SR20 what boost are they most efficient at? about 1.1 bar or more?

The GT-RS is a little high for my liking. If you could strap one to an un-opened motor and get a safe 220rwkw at max efficiency or close to it, I think they would be an awesome option for street use.

[RS500]

Hmm I'm starting to look more into a GCG Hi-flow now..

I just want my 250rwkws dammit!!

<{POST_SNAPBACK}>

dude,

the garrett GT3071R (external w/gate version) will flow enough air to make 250rwkw happily.

the comp wheel itself can flow up to ~450bhp, and the turbine is the 60mm GT30 wheel which flows ~500bhp easily.

the GT3071R with A/R .82 on an RB25DEt would be a killer combination IMHO.

good luck anyway.

[quincy777]

I just took off 3071 internal gate turbo from my r32 gtst as it was shit... couldn't control boost kept going in excess of 22psi. Made good power up high 254 at 8250rpm. Dog under 4000rpm and only exciting from 5000rpm.

External gate on rb25 would be ok, internal gate - forget it. Rb20 forget it.

[The Mafia]

hows it feel on 7psi? N/A like?

<{POST_SNAPBACK}>

lol actually, the car is much punchier down low with this turbo, as it must be able to breathe easier because the turbine isn't creating as much resistance being a ball bearing.

and I said, 7psi = about 200rwkw... Its definately not N\A like... With a good launch, chirps all the way through second

I just took off 3071 internal gate turbo from my r32 gtst as it was shit...  couldn't control boost kept going in excess of 22psi.  Made good power up high 254 at 8250rpm.  Dog under 4000rpm and only exciting from 5000rpm.

External gate on rb25 would be ok, internal gate - forget it.  Rb20 forget it.

<{POST_SNAPBACK}>

I'm running an internal gate. No problems here.. With the wastegate completely open, it makes a max of 3psi boost.

Edited October 19, 2005 by The Mafia

[Cubes]

Mafia,

I found the same thing, upon fitting the larger turbo it has free'd up the bottom end, feels freeier and tends to free rev quiker also.

More off the line let the clutch out torque.

What I meant by N/A like, so its not linear then? lags a little then hits solid and pulls?

[Roy]

Now that we know someone has made 250kw @ wheels with a GT3071R on an RB20DET (other thread) with full boost by 4000rpm, we can agree that the GT3071R is a good unit?

<{POST_SNAPBACK}>

I would check those numbers

[The Mafia]

What I meant by N/A like, so its not linear then? lags a little then hits solid and pulls?

<{POST_SNAPBACK}>

Team america - f**k YEAH

hehe

yeah pulls harder off boost, but then catches boost and starts chirping in second lol

so yeah, hit boost and starts going like your mum - an animal

(hehehe jokes)

I wouldn't say its like na at all

[Lithium]

Roy - I'd misread the full boost thing.... though he did say 14psi by 4000rpm, which is pretty decent spool, no? This is bearing in mind that RB20DETs don't spool turbos overly well, and need a few revs to go - I'd imagine (as Quincy said...) that one should go very nicely on an RB25DET.

Mafia - Do you know if there were any modifications to the VG30 wastegate port to allow it to hold boost like that? Are you using a Garrett supplied actuator with it?

[discopotato03]

I'd say you hit the nail on the head Cubes , if a turbine side is causing a major restriction uncorking it pays off . It makes me wonder if the small turbine and housing combination had some emissions benefit - sort of heat and a little forced EGR .

Notice how at times larger ARR turbine housings pull the cork out and unleashes a few ponies with no change to the compressor or cover . I guess it comes down to how well the sysyem was designed in the first place and its aims .

The combination I always wanted to see on an RB20 was the 25 exhaust housing on an otherwise std turbo , how much gained compared to how much lost . At least it should all fit and look standard .

The GT3071R (-23 CHRA) is biased toward exhaust flow turbine wise so may not need big housings to make it work depending on the desired state of tune and engine size .

[RACESPEC]

Wolverine

The unit you are refferring to is either

CHRA 700177-13 GT3076RL

Compressor

60 Trim

59.03mm

CHRA 700177-14 GT3082RL

Compressor

56 Trim

61.36mm

Thanks

Tarek

RACESPEC

[The Mafia]

Roy - I'd misread the full boost thing.... though he did say 14psi by 4000rpm, which is pretty decent spool, no?  This is bearing in mind that RB20DETs don't spool turbos overly well, and need a few revs to go - I'd imagine (as Quincy said...) that one should go very nicely on an RB25DET.

Mafia - Do you know if there were any modifications to the VG30 wastegate port to allow it to hold boost like that?  Are you using a Garrett supplied actuator with it?

<{POST_SNAPBACK}>

no modifications what so ever to the waste gate port. And I am running the garret actuator with it.

No problems. With the gate fully open, the most boost it will make is 4psi, max.

[RAZOR32]

I've got a GT30R To go on a RB20 and I am abit worred it is going to be to big and laggy???.

Specs are .7 front cover 58mm wheel and rear housing 0.63 56mm wheel.

Dont know why i was sold such a big front cover? and it is internerly gated,

Any one got any idear when it would come on boost and what have other people got on there RB20's, what kind of power will it make-230 or so on 1 bar?

It would be great if any one could help me out, Thanks