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Turbo setup for 400KW RB26

Dahtone Racing
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benjiman74 Collaborator

benjiman74

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two.06l, was that using stock internals, and pump fuel? I didn't think manifolds made much of a diff on the GTR...

I think its more attributable to the 25psi boost pressure. At this boost there wouldn't be much room for error when running pump fuel and a non-forged bottom end.

Guest two.06l

Guest two.06l

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I think its more attributable to the 25psi boost pressure. At this boost there wouldn't be much room for error when running pump fuel.

yeah fair point but we are on the safe side of the limit and we have a very strong engine combo.as well as the best tuner looking after the numbers

benjiman74 Collaborator

benjiman74

Posted
Posted
yeah fair point but we are on the safe side of the limit and we have a very strong engine combo.as well as the best tuner looking after the numbers

two.06, yeah ive read the specs on your car before and your bottom end should handle 25psi no probs. My comments were directed at others whom are running 2530's on stock bottom ends like myself. 20psi on pump fuel with no octane booster is a safe limit and should see 320 - 340rwkw.

  • 2 weeks later...
Dahtone Racing Grand Master

Dahtone Racing

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That should be good for 550kw @ the wheels. Overshooting the target a bit?

yea thought so but i wasnt quite sure

im thinking of just going down to GCG and seeing what they can build me instead of going for a jap kit

DoughBoy Veteran

DoughBoy

Posted
Posted

Ok break it down a bit:

400rwkw= 500kw @ flywheel

500kw = 670hp

670hp = 61 lbs/min peak flow based on 10.85hp/lb

Twin 2530's would be getting to be at the limit of their flow capabilities, 2540's would be able to do it, same with GT-RS turbos. In the highmounts any pair of 2835s could it too. The higher you go, the more undriveable it's going to be.

I just used HKS turbos since they are a well known configuration. You should be able to easily get a similar configuration from a decent turbo outlet. No doubt GCG will be happy to sell you a set of GT35Rs or GT42/45Rs that would see you to your expected output figure :(

DoughBoy Veteran

DoughBoy

Posted
Posted

Oh and as for single turbos, any GT35, GT42, GT45 would be able to do it, or XTR T66 upwards, Turbonetics T66 and up as well (funny that, they just use the same configuration and model designation as Turbonetics? What was that saying, imitation is a form of flattery?), and a whole host of other singles (Holset, KKK, Apexi's new AX singles etc).

All comes down to if you want lowmounts, highmounts, singles or doubles? Or stock turbos and a big whiff of nitrous :(

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