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GT3071 or GT2871 on rb20

quincy777

By quincy777,
in Engines & Forced Induction

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Dale FZ1 Veteran

Dale FZ1

Posted
Posted

Yes, Discopotato, you are right. Later I thought my comment didn't read well.

I asked whether the GT30 housing came as an unmachined or semi-finished blank that required finishing before fitting up. If that were the case (and doesn't seem to be), then the possibility could exist.

How then, does Garrett get the 56.5mm wheel mated up to the internally gated housing that they call a GT30 that is evidently very different to the externally gated GT3076 with its 60mm wheel? I say "evidently very different" because of their vastly differing flow/efficiency maps and the obvious different method of turbine speed control.

Do they both fall within the UHP family, and where is the information about that and NSIII?

Hopefully I will get it soon...

BTW I am going to kick off a thread about interpreting turbine maps just to keep the brain ticking over.

cheers

discopotato03 Grand Master

discopotato03

Posted
Posted

The GT30 and GT28 exhaust housings are very different internally both being based around their native turbine major diameters ie 60 and 54mm . They modified or cropped the 60mm to the maximum size that would fit in an overboared GT28 housing and came up with 56.6mm . The Hub is too big and heavy for the shortened blades and the blade form is not the best in shortened form . The GT28 nozzle form was designed for GT28 turbines and so not optimised for the diametre of the hybrid . Turbine efficiency suffers and shows up as lag .

  • 4 weeks later...
Dale FZ1 Veteran

Dale FZ1

Posted
Posted

Great result quincy777, and right on target.

Couple of things I would like comment on if possible:

what sort of flange adaptor did you fabricate, and how did the turbo - suspension tower clearance work out?

what did you do for a suitable dump pipe

what is the boost threshold point (ie when does it go from vacuum to pressure)

how quickly does it build boost (once on boost)? Looking for comment about whether the power is controllable

cheers

Dale

quincy777 Community Regular

quincy777

Posted
  • Author
Posted
Nice results for the 3071. When do you get full boost? Is it internally gated? Like the 3071-WG on atpturbo.com?

I get a bar of boost by 4rpm, internally gated and on standard manifold. Bought it from horsepower in a box. Lot's of fiddling and adapting with flanges, lines and crap but seems a great option..

jaik Mentor

jaik

Posted
Posted

I am planning to run one of these once I put some money aside (currently doing some serious body work!). From what Ive read around the place the GT3071R has almost the same spec front wheel/housing as the HKS GT2835ProS turbo. The main difference with the current breed of GT3071R is that theyre very common with a T25 Int Gate rear housing. Its been discussed around the place that getting the GT3071 with a 90 trim exhaust wheel and a HKS T3 .73 a/r exh housing is the way to go, as Garrett only offer a .6x and a .8x size in T3.

Housings are only USD$300 from HKS direct.

JK

  • 1 month later...
superclarkey Enthusiast

superclarkey

Posted
Posted

I've been thinking of putting a Garrett GT3071R on my RB20, do the RB20 manifold take T3 then?

Is this the turbo you lot are talking about? http://www.atpturbo.com/Merchant2/merchant...tegory_Code=GRT

was going to order it with 3in outlet ect.

But didn't know what you guys would surgest for A/R, i think i got the undertstanding that .82 is the one to go for?

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