How come I always agree with you Nad
:lol:
Steve; I would say the best suited HKS turbine for the SR20DET RWD engine as mostly used by Japanese tuners is one of the forms of the GT3037; Many Jap tuners use GT2835 turbines on AWD cars like the EVO's, so probably a good choice for our R (SR20DET AWD). But then again other turbines would function well if both benefits and disadvantges of a particular turbine is counted for before choosing one. If you're planning to make an engine which will run sweet between 4000-8000rpm+, and you will not be bothered with a "little" more lag, than an GT3037(S or PRO) 52T or 56T and GT3240 54T would be a good choice. But if you're after an alomost OEM turbo-lag engine with "reasonable" power levels the GT-RS 52T with its 71,1mm compr wheel would be perfect match.
I only heard negative responses about the HKS GT3040 and the HKS GT2535 to the GT2540.
Also good alternatives for big power hickups for our R-engines are the GReddy TD06SH-20G (450+hp), TD06SL2-20G (500+hp), TD06SH-25G (550+hp), T67-25G (600+hp), T78-33D (700+hp). All of these GReddy turbines use conventional thrust bearings, so they will be a little more laggy, but are cheaper to buy and alos cheaper to rebuild when there worn out.
And there are ofcourse the Apex'i ball-bearing turbines, which use IHI as a base, and are also very decent items
The Apex’i RX6B TCW15 (440hp), RX6B TCW10 (500hp), Apex’i RX6B TCW76LS (520hp), and Apex’i RX6B TCW77LS (560hp) could be considered when seeking for good power gains for our R engine.
Like Nad said: "On that note the turbo is only as good as the engine it is matched to." is a big truth.
rgds
habib