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that will work well .... kinda on the laggier side with the .81 with a big kic in the pants comming on.... from what i am led to believe rear A/R is determined by inlet and engine capacity to be able to spool up at different times or give more HP depending on the A/r rating...

a .9 would give more hp but spool up much slower

a .7 would spool much quicker but less peak hp

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smaller rear exhaust housing will allow much faster spool up, being a relatively large turbo. My suggestion is to go with a IHI/Apexi AX6 turbo, im running one on my 33 RB27DET and its awesome, spools up early full boost easily by 4 or less and cranks till 9,000rpm or more its a fun turbo to have and u wouldnt regret it, but same thing applies, a smaller rear exhaust housing and itl b crazy..mines larger but i got heaps of engine work

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My engine currently has a HKS 2835 pro s with a tomei 270 procams and a full bottom end, so I figure I've got the hardware, may as well get a turbo to match it. The hks t04z apparently also comes ian 0.61 housing, does anyone have an idea on start spool rpm and full boost rpm? What hp is a Rx6 rated for?

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We have a fully built RB25/TO4-Z (HKS) combo due for completion very soon. Engine is done just waiting on cams and injectors to arrive from the land of the rising sun. We have gone with a 0.81 rear housing as the owner is a bit of a power junkie and top-end punch is what he's after. Will keep you posted with our results. The old engine had a GT3040 (garrett) hanging off the side of it.

Edited by DiRTgarage
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My engine with a tune from japan currenlty has a rev limit of approx 8,000rpm, so I'm hoping that should widen the power band a bit. I've already got solid lifters and valve springs so I can't see why this can't be extened another 500 rpm or so. DiRTgarage I'd be very keen to see how that car performs, if you could keep us psoted that would be tops.

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My engine with a tune from japan currenlty has a rev limit of approx 8,000rpm, so I'm hoping that should widen the power band a bit.  I've already got solid lifters and valve springs so I can't see why this can't be extened another 500 rpm or so.  DiRTgarage I'd be very keen to see how that car performs, if you could keep us psoted that would be tops.

Yeah ookami, more than happy to keep ya in the loop. Will let ya know how it comes up.

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