What aftermarket turbo are you running on your RB20DET

[discopotato03]

To the fellow with the pix (RS500?) . That turbo has a T3 flange GT28 integrally gated .64AR turbine housing . The Turbine is a 76 trim NS111 (47 x 53.8) . The compressor wheel is harder to identify from the pic . To me it looks like a 2540 but need to remove the comp cover to be sure . If its major dia is 76.2 then its a GT2540 with a TO4E compressor . If its 60 its a 2530 .

For those who want good technology without the HKS price see Brett at GCG . A cheaper and more efficient version of the 2530 is called the GT28RS or Disco Potato . Same turbine as HKS 2530/2540/GTRS/Garrett GTR Hi Flow , with a similar sized 60mm compressor to the first and last mentioned above , only more efficient due to greater tip height and its TO4B comp cover . They come std with a .86AR GT28 turbine housing but maybe Brett can supply the T3 .64AR flanged version .

Want a cheaper HKS GTRS ? Garrett do a turbo called GT2871 which is the same CHRA as the GTRS but with the TO4B comp cover . Need to swap turbine housing but can be bought without one .

The GT28RS seems to top out at about 320-30 WHP because the compressor runs outof flow . The GT2871 performs like the HKS GTRS because of its 71mm BCI 18C compresor wheel . I have used the GT28RS on an FJ20ET with very good results . If Brett or someone can supply you with an adapter that works (T3 - T28) this should be an easy upgrade for the RB20 .

There is a new thing called GT3071R , basically GT30 turbine with the same compressor as the GT2871 and HKS GTRS .

For those wanting more the GT30R is identical core wise to the HKS GT3037 in 56 trim . This time the turbine housing is T3 flange normally sold with .82 or 1.06AR exhaust housings . Brett has shown me a .63 AR gt30 exhaust housing which is in short supply at the moment .

where HKS gets a bit unique is the 2535's with their 84 and 90 trim turbines (those with the 56ish mm major OD) . A production engineer from Garrett's in the US tells me that these were a cropped GT30 84 trim turbine , to allow HKS to get a bit more exhaust flow from the 86AR GT28 integrally gated exhaust housing , for an easy "drop in" upgrade not requireing expensive manifolds or external gates .

Search ATP Turbo.com for more details but remember Australia is a small market for these things and don't waste time asking Garrett Australia . Search the web and dont hassle Brett unless your serious . He dosen't have time to waste either .

Chow DP03 .