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Hks T04z - Which Exhaust Housing Size?


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Hi all,

Im looking at the HKS T04Z and the 3 exhaust housing sizes available and deciding which will be the most suitable for my built RB26.

My question is, with my car being predominantly a street car with occasional drag and circuit work, which housing size will be most suitable?

According to the HKS catalouge they are available with a .61, .81 and 1.00 housing, and so far the common opinion seems to be that the .81 is the go.

I realise the garrett and HKS equivilents are much the same, but is anyone here actually using on of the HKS versions?

Thanks

Nick

:rofl:

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People who talk about them say they chose the .81 for RB26's (HKS version) . The turbine is a TO4 P trim which is very common in the turbo world , Garrett do heaps of different a/r TO4 P trim exhaust housings in T3 or T4 mounting flange pattern and single or twin entry (split pulse) . Some are saying that the spanky HKS drilled compressor cover is unnecessary because that TO4R compressor is not prone to surge .

If I was buying one I'd get the Garrett version because I cannot afford the extra ~ grand for HKS particularly since the cartridge/wheels are identical . Also I don't think these need the huge T4 mount flange pattern that HKS versions have . I have a couple of snaps of one with the TO4S .70 a/r comp cover and can't remember which Garrett exhaust housing .

Cheers A .

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Thanks mate, im looking at the HKS version purely from opportunity as I can pick one up for a decent price while im in Japan in a few days.

Any idea on response that could be expected from the .81?

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Response will be pretty much similar to the Garrett version (if not identical)... theres a few threads in forced induction, I think someone made 600 odd hp at the rears and on full boost before 5000rpm.

I know someone who grabbed a Garrett one with the .61 rear housing on a standard capacity RB26. On 25ish psi it made 370kw at the rear wheels and is on full boost before 4000rpm, but it runs out of puff top end (possibly too small turbo).

Seems the .81 housing is the best all rounder, providing power to redline and fairly responsive.

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certainly seems like the .81 is preferrable, im running GT-SS's now and its because of their top end 'lack of puff' that im entertaining the idea of a single conversion :rofl:

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Thanks mate, im looking at the HKS version purely from opportunity as I can pick one up for a decent price while im in Japan in a few days.

Any idea on response that could be expected from the .81?

my personal option would be as follows....street RB26...0.61, street/circuit RB26...0.61, street/drag RB26 0.81, street RB27/28 (ie. stroker) 0.81, street/circuit RB27/28 0.81, street/drag RB27/28 1.00, street/circuit RB30...0.81, drag RB30 1.00.

this is only my personal opinion.

hope this helps mate

Paul

Edited by DiRTgarage
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Paul, I would lean towards street/drag if anything, and I would prefer to go for the .81 than buy the .61 and find it falls short

If leaning towards street/drag then the 0.81 would be my choice with std capacity and crank...as per my guide.

good luck with your purchase...(bastard!!)

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Simple answer = 2 X 2530

:wub: cheers :D

or Garret gt2560r x 2 (pretty similar results)

i still am amazed none has tried to find out what the IHI turbos are on the Z-Tune personally i think the turbos nissan pick for there ultimate gtr after 15 year of development might be pretty damn good.

pete

ps if i wanted nasty street/drag twin gt2835 hks kit or twin gt3071r

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