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HKS's GT2510 was one of their older spec GT28 turbos , basically a GT2530 (60mm 63 trim compressor) but with the slightly less performance oriented GT28BB turbine . It shows the dated thinking that more restrictrive turbine would add better spool to same compressor . Later practise shows us that it takes more exhaust energy (meaning also restriction) to drive the same compressor and the hot side choking prematurely compared to a GT2530 with its more open bladed (and less blades as well ) turbine . This was why HKS turbos like the GT2510 and GT2540 were discontinued , replaced by better combinations like the GT-RS and SR20 spec GT-SS . The SR20 spec GT-SS uses the same turbine as the GT2530 but with a smaller trim 60mm compressor ie 60 vs 63 trim . What they achieved was better exhaust throughput (less restriction) and less or lower workload for the turbine with the 60T compressor which brings response up (boost threshold down) .

Cheers A .

I've seen 210rwkw, you would get a similar result from a much cheaper R34 RB25 turbo.

But we have to remember that the 34 turbo is still a ceramic turbo...so anything more than 14psi and you are looking for trouble...

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