Gtr Single Turbo Selection

[SRB]

i decided to rebuild my gtr and try part with my t51r kai for something a bit more responsive

im stuck in choosing a new turbo, has to be ball bearing and relatively responsive.

ive been reading alot on here and basically read that the t04z .81 is the go... just curious as to who has used the hks version of this turbo?? i kno the garret one is pretty much identical but me being me i want hks as all my other shit is hks.

here are some specs of my engine (im putting in new metal gaskets, pistons, rings and bearings)

greddy intake plenum w/ 100mm billet throttle body

800cc injectors

M&W direct ingnition

CP forged pistons 40 thou

N1 ring pack

NISMO conrods

ARP bolts

Crossdrilled and prepped crank

Gibson custom camshafts

Gibson custom sump

custom oil cooler and catch

i want between 500-600hp at wheels, car will be used mainly street and see the track wenever i can make it out there, just for fun tho

so is the t04z .81 the go or am i missing something??

all help is appreciated

thx

Edited September 19, 2006 by MR MAD

[SLY33]

im completely with you and ditto your above post! ive been umming and arring for months now on what turbo to use! Im fairly sure about the HKS to4z .81, like you simply because i want the name, but am also curious as to whether it will possibly be any better than the garret version. The only problem im having is the price of the full HKS kit.

[paulr33]

do you want some realistic rpm response vs boost build?

why not something remotely small like a gt30 or something

should make good average power, i dont see a need for a captain insano 1.1a/r housing to make massive amounts of power, unless u plan to use it all the time

[SRB]

like i said, i would go garret but i originally purchased a full hks t51r kit now sold off the turbo..and id like to keep it in the family i dont want a small single coz it pretty much defeats the purpose of converting to single otherwise i would have jus got a pair of 2530s or whatevr.. after reading thru a few guys results with the t04z, comes on boost nicely and has a nice curve and also makes awesome power, jus seein if any other turbos may have come out or mayb sum1s found sumthin else thats as suitable. like i said, aiming for 500-600hp, fullboost around the 5-6k mark

[Adriano]

If you only want 500-600hp why use a single at all?

[SRB]

all the provisions have already been made and im not goin back to twins lol im not wasting more money, 5-600 at the wheels that is.. was considering bigger but its pointless 4 me as i plan 2 part with the car in the near future..

[SLY33]

i dont see a need for a captain insano 1.1a/r housing to make massive amounts of power, unless u plan to use it all the time

yeah i agree but we never intended going the bigger housing... A user on this forum made 467rwkw (just over 600rwhp?) using the garret to4z 0.81, with average power that would put most of the larger twins needed to make that power to shame! Plus i hear that when your making that sort of power, surging with twins is an issue...

anyone got any leads on the cheapest source for a HKS to4z Full Kit? i think nengun's is about 7500ish they say "delivered" but its bound to get slugged import duty, which means your not gonna get a whole lot of change from ten grand! I managed to get my step 2 HKS 2.8 stroker kit for well less than that!

just checked for r33 GTR, T04z full kit is $7334 delivered on nengun. Can someone tell me the exact %age import duty that applies as i forget?

cheers

Edited September 19, 2006 by SLY33

[discopotato03]

For that 5-6 full boost I'd be looking into Garretts GT4088R , these are available in Australia now and I think retail was ~ $2700 . The trick I'm told with them is to use the .72AR comp cover and not the smallest .85AR exhaust housing ie at least the .95 or 1.06 .

Geoff Raicer from Full Race Motorsports in the US really likes them and makes good exhaust manifolds inc if I'm not wrong one for the RB26 .

While the TO4Z's seem to work well I can't help thinking the P trim turbine is not up with the times , right diametre , right trim , dinosaur design .

Cheers A .

[Gav]

Can someone tell me the exact %age import duty that applies as i forget?

cheers

Import duty is 5% then there is the GST on goods, postage and the duty itself. In other words a tax on a tax!

Works out to around 16-17% of the value if you are unlucky enough to get picked up. See:

http://www.customs.gov.au/site/page.cfm?u=5549

Cheers

Gav

[R31Nismoid]

t04z's results speak for themselves (RB26 dyno sticky, and past threads)

It will rake in 600rwhp no problem provided you have all the support gear and motor in place.

You might even nad 650-700 if you pushed it with fuel

[SRB]

thx 4 the suggestion A will look into it whats the difference between the turbines? uhp?

[SLY33]

Import duty is 5% then there is the GST on goods, postage and the duty itself. In other words a tax on a tax!

Works out to around 16-17% of the value if you are unlucky enough to get picked up. See:

http://www.customs.gov.au/site/page.cfm?u=5549

Cheers

Gav

Thanks for that Gav! How are the GTRS's going for you? feeling the need for more yet!!!???

[Faid]

well impusing nealry 600rwHp out of a 0.81 T04Z. hitting full boost at about 5200rpm, but i rev my car till 9800. but believe me youd be suprised how the T04Z pjust nails you into the seat. are the HKS kits so expensive over there, i got mine directly from japan with manifold and a wastegate for $6500 in my hands, but then again you guys have to deal with all sorts of taxes. i bribed some friends of mine over at customs, got it cleared for no cost at all.

[SLY33]

well impusing nealry 600rwHp out of a 0.81 T04Z. hitting full boost at about 5200rpm, but i rev my car till 9800. but believe me youd be suprised how the T04Z pjust nails you into the seat. are the HKS kits so expensive over there, i got mine directly from japan with manifold and a wastegate for $6500 in my hands, but then again you guys have to deal with all sorts of taxes. i bribed some friends of mine over at customs, got it cleared for no cost at all.

where are you located?

what boost you running and is that the most you can get from your setup? what crank are you using for those 9800rpms?

So you just got the turbo, mani and wastegate for 6500? i think the full kit includes every other little bit and piece you need, correct?

I can order directly from japan via a contact, but yeah the taxes on taxes add a bit to the final price. if you were to go into a retail shop in australia and quote the full kit, im sure youd be looking at 10grand! ridiculous!!!

[discopotato03]

Sorry , sifted through this thread too quickly - I though I read full boost at 5-6000 and 2.8L . Online before first coffee ...

Yep TO4Z the best big all rounder IMO . If money is an issue you could buy the Garrett cartridge and add the HKS turbine housing to it .

Is the power number because you want it or a sales thing because T3 flanged manifolds are available and a large exhaust housing GT3540R would pull pretty well and be cheaper again .

I'd be careful how much I spent on that car if its to change hands in the near future .

Cheers A .

[CruiseLiner]

hks to4z front comp cover has a bigger inlet (2 3/4' comparet to garrett's 2.5') and looks bigger in size from memory when i seen the garrett unit. mine (hks t04z 0.81) makes fullboost under 5000rpm and pulls hard as hell to 9000rpm and made 417rwhp on 13psi boost (JUN 2.7l stroker) with 3' exhuast/stock gtr cooler and tiny 2.5' rear muffler so its definetely got more in it on the same boost even. that was a really conservative tune and afr's around low 11:1's up above 6500rpm.

i can send u a dyno graph if u like but ill pm it as i dont want to post it on the forums.

send me a PM if u want anymore info on it.

i havent upped the boost anymore as yet because i cracked the stock block but new n1 setup is being put together at moment and will be making some interesting numbers

whens the kai make fullboost on your setup? is that the ballbearing version, or is the bb one SPL? how much u want for it and how old is it? they rated to 800 or 1000hp? they use the v band flange onto manifold dont they?

for 500-600hp id be tempted to try something smaller like a gt35r as the lag is abit annoying if u have any trackwork planned. maybe i just expect to much power too early in rpm range the big rpm limit makes it alright though as i have 4500rpm to play with.

Edited September 21, 2006 by CruiseLiner

[discopotato03]

T51R KAI .

Cheers A .

[Angus Smart]

You also have to add in the fact that when you buy the hks "kit" you get all the shit with it. not just the turbo like garret? (unless they have changed their game recently)

Edited September 21, 2006 by Angus Smart

[discopotato03]

Inside HKS's unique TO4Z compressor cover , as Doughboy said slightly different diffuser area .

Shh ! Don't tell cruiseliner ...

And a couple of extra pics why not .

Note how the compressor backplate is iron and not aluminium , would not be surprised if Garrett used the same one from the old TO4S 60-1 turbo . Had they used an aluminium GT40 series backplate/cover they may have been able to get a similar effect diffuser wise . I suspect the TO4Z CHRA is just a comp wheel change to the BB P trim/60-1 cartridge with the cover reprofiled and the backplate machined out from ~ 76mm to ~ 84mm . Simple and cheap . Probably cheaper for HKS to get a custom comp cover with a larger diametre diffuser section made than to alter Garretts cartridge (backplate) .

A little O/T but that GT37R cartridge with the Z's (TO4R) compressor could very likely out do the TO4Z .

Edited September 22, 2006 by discopotato03

[CruiseLiner]

dp u funny bugger