Another Rb20 Turbo Choice Thread

[Matty 31]

Only made a new thread because i couldnt find exactly what i was after in a search

My new 31 project is going to be a grip car. the 20 i pulled out of my old drift shell is still alright, but otherwise stock (was around the 160rwkw mark with stock turbo and un-remapped ecu). For now its staying standard (injectors, internals etc) except for a re-map.

Having a forward facing plenum fabricated, as well as a new exhaust manifold. Would like to retain a T3 flange pattern for the turbo i choose. Im also intending on going external gated for ease of boost control

Heres where i get a grey area

Originally started down the lines of wanting a GT2871R merged with an R33 RB25 turbo (of which i have a blown 25 turbo sitting in my shed). Cost was a bit of a clincher, then was informed that the 3071R would be a better suited turbo (only coming on slightly later, and being T3 flanged)

Ive since had a read and i cant see where anything below a 3076 is T3, so im now somewhat confused again

What id like to achieve from this turbo:

For now, as im only running a 20 box, id like to limit the power around the 200rwkw mark until i can afford an RB25 box, then its maximising the power from there (bigger injectors i know, and possibly even cams too)

Ive assessed my situation and if this motor pops i'll spend the money getting this built into an RB24. I realise that will mean a definite need for a turbo upgrade (aside from many other things) so thats why i was looking at retaining a T3 flange for ease down the track.

So, let the discussions begin. Im a few months off buying a turbo, so will help to see the pros and cons right now

Thanks

Edited October 12, 2009 by Matty 31

[aDrew_C]

Proper GT3071's do come in T3, look on here for traders, Slide sells them. Also places like horsepowerinabox.com, don't know many other places as I haven't been in the market recently.

I would suggest a highflow for your initial goal, but considering you want more power later, a 3071 is a good choice. You'll need to decide if you want internal or external gate. Internal is definitely better for mild tuning, but for over 250rwkw can cause issues. Internal makes buying the right turbo a lot harder so you'll need to do your research. I'd still recommend internal even considering your final goal of a 2.4L. On that note, a 3071 should still serve you fine for any upgrade you can do to a RB20, including stroking, that is unless you're searching for peak power in sacrifice of a good average power curve.

Edited October 12, 2009 by aDrew_C

[Matty 31]

I would suggest a highflow for your initial goal, but considering you want more power later, a 3071 is a good choice. You'll need to decide if you want internal or external gate. Internal is definitely better for mild tuning, but for over 250rwkw can cause issues. Internal makes buying the right turbo a lot harder so you'll need to do your research. I'd still recommend internal even considering your final goal of a 2.4L. On that note, a 3071 should still serve you fine for any upgrade you can do to a RB20, including stroking, that is unless you're searching for peak power in sacrifice of a good average power curve.

Thats the plan, to be able to use the same turbo in the interim (till a box upgrade) and then wind the boost up. saves un-neccesary spending. I know a few people have said that theres no need for external gate, but as you said, it makes it harder choosing the right turbo if you keep it internal.

At the end of the day, im aiming to put this car in time attack/sprint style events, the occasional hillclimb etc. I want good average power curve with fairly minimal lag and a good top end too. Peak power only wouldnt make a very driveable car on track (especially a torqueless 20)

Thanks for the positive information, helped steer me in the right direction thats for sure