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What ATP calls a GT3071R dosen't have a HKS equivalent . It's a GT30 turbine with a 71mm compressor .

What HKS calls a GTRS has a GT28 turbine and the same 71mm compressor . The same core in ATP speak is GT2871R . The 71mm compressor wheels are GT35 series in Garrett speak . Thats why when you get the 35 on the end of GT2835 .

So as to not confuse , the HKS 2835's use a ground down or factory cropped GT30 turbine from memory 56.6mm in 84 and 90 trim . These are as large as Garrett go with turbines in GT28 style integrally gated exhaust housings . ATP are also selling these now .

For reference :

Compressors

GT40 = 82 mm

GT37 = 76.2mm

GT35 = 71.1mm

GT30 = 60.1mm

  • 6 months later...
I would not loose any sleep . Garrett do two CHRA's very similar to the 2530 , one is from the GT28RS (better 60mm compressor) and one called the GTR upgrade CHRA . In fact garrett do a similar if not identical turbo to the 2530 for direct fitment to the RB26 .  

The GTRS is only badge engineering on a 2871R (see ATP Turbo.com) both are streets ahead of the HKS GT2540 which was garbage anyway .  

Any one with tap into HKS will find they had an exclusive tie with Garrett to produce certain combinations of compressor and turbines . This would have had a sunset clause and competition issues would have stuffed it for HKS . So you'll  find all these things being sold round the world by Garrett (who makes them anyway) for less than HKS thievery .

Thats interesting, someone I know insists to me that the "smaller" a/r turbine housing on the GT2871R (.64 or something?!) is susceptable to compressor surge - and is overall too restrictive for an RB25.

I'd be all keen for a 2871R, IF it is able to supply up to around 250rwkw on my RB25DET - do you think that would be a realistic hope?

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