Turbo options on a RB26/30

[boostedvl]

Im tossing up between a couple of options for turbo/s on my RB26/30 I am currently building. I am considering running a pair of turbos such as these:

GT32 73 Trim .78A/R (externally gated versions)

Turbo specs

As these are non ball bearing turbos, will there be a noticeable difference compared to ball bearing versions in spool time?

Will these be able to flow enough for 400 rwkw through an 3 sp auto? Rest of ancillaries will be up to spec. Or should I just stick to something like a single GT40 BB turbo?

Any help appreciated.

[Wazz]

Twin BB 400hp GT25's from garret would do you fine for 400rwkw but a single GT35r with 0.82 exh a/r would possible be pushing close to 2 bar to push out 400rwkw tho? dont take my word for it tho as not to how the GT35r's are with 400rwkw.. waiting for a few people to get there car tuned.... *cough* 55nat

dont forget tho.. if a big single can do the job.. its easier to pay for one turbo and a waste gate instead of 2 turbos or 2 turbos and 2 wastegates... either wat your choice.. personaly i'd prolly go with the big single.. have you looked into a HKS T51R KAI?

Waz

[180bfj20det]

One turbo is always better than two providing the turbo setups (ie 2 vs 1) are both of the same design. I have been through this before. Anyway, a single GT3540 will give you 400rwkW or with your capacity you maybe better of with the GT40 or bigger if you want. Id stick with the first two, probs the GT40. Anyways, there is no excuse for going twin. Garrett make ball bearing turbos that can support 2000hp (GT60, compressor 141mm). You will be happier going single. Cheaper, more efficient (ie boost earlier and more power) and much much easier to service.

Run 8.5-9:1 compression and GT40 and 400rwkW on street fuel and probs + octane booster. Ofcourse if you want to make huge HP....use on of garretts big BBGT turbos.

Please PM your email address (MSN/hotmail if possible) as Id love to hear about your progress.

Good luck

[Roy]

Id stick with the first two, probs the GT40. Anyways, there is no excuse for going twin. Garrett make ball bearing turbos that can support 2000hp (GT60, compressor 141mm). You will be happier going single. Cheaper, more efficient (ie boost earlier and more power) and much much easier to service.

Run 8.5-9:1 compression and GT40 and 400rwkW on street fuel and probs + octane booster. Ofcourse if you want to make huge HP....use on of garretts big BBGT turbos.

Im a fan of the singles...and agree with most of what you said, but boost earlier?

Doesnt it depend largely on the power you are chasing, and also the turbos themselves. Dynamically two 320hp turbos have less inertia then a 600hp turbo, well at least the few examples where i did the calcs seemed to support it.(Based on Garret compressor and turbine sizes)

It depends a lot on what else you are doing to the engine, and a big single will likely work great, but twins do have a place and on paper can be more responsive:cheers:

[R31Nismoid]

3 speed auto... that will suck a tad.

but meh.

i'd aim higher than a GT35 if you after 400rwkw or more.

single makes everything neater and easier