To4z

[tricstar]

whats your experiences with TO4Z , I'm thinking of getting one and I've been hearing different things....

I'm chase a turbo for 600+rwhp with as good a response as you could expect, which rear housing.. etc

theres million different TO4Z's, .......... on a 2.8L with 272 jun 10.8 cams which one ?????

I've been reading the dyno threads etc but not everyone says what TO4Z they are using ??

[R31Nismoid]

There isn't a million.

There are two.

One made by Garrett, the other by HKS.

Then there are .82 or 1.06 rear housings that are used (HKS's variants IIRC are slightly different)

HKS items also use anti-surge front covers.

That's it. If you want 440rwkw+ - its a 1.06 housing.

[jonn]

Hi Richard,

Go Garrett. You should also get in touch with Brockas as his is making around 586hp and that's still a 2.6.

I'd start off with the .82 housing to get the best response possible. Well that's what I want to put on mine anyway so would be good to see how it performs

No luck with rebuilding the turbonetics or just too costly to do?

Cheers, Jon.

Edited June 9, 2010 by jonn

[bradsm87]

T04Z is stone age. Go a GT4088R or even better, wait a bit longer for the GTX4088R

[tricstar]

Hi Richard,

Go Garrett. You should also get in touch with Brockas as his is making around 586hp and that's still a 2.6.

I'd start off with the .82 housing to get the best response possible. Well that's what I want to put on mine anyway so would be good to see how it performs

No luck with rebuilding the turbonetics or just too costly to do?

Cheers, Jon.

Ha Jon, can rebuild the turbonetics with a new oil and water cartridge for about 1200, but thought that might be a good opportunity to change, seen some good results from the TO4Z'S @ OR AROUND 600RWHP, I think thats about what the turbonetics GT-K850 was putting out at 24psi, and maybe better response from the TO4 !?

either way you'll see it next track night

[2BNVS]

i got 26/30, jun 272 cams T04Z 1.00 split like r31 said for 440rwkw+ get the larger of the 2

[unique1]

A HKS 0.81 to4z will go over 450kw, mine made 605rwhp (i think thats around 463rwkw) on only 21psi on 98 pump fuel. Others with garrett 0.83 versions have also done the same and better with more boost.

[GTS-t VSPEC]

A HKS 0.81 to4z will go over 450kw, mine made 605rwhp (i think thats around 463rwkw) on only 21psi on 98 pump fuel. Others with garrett 0.83 versions have also done the same and better with more boost.

I agree, I went down from the 1.06 to the 0.83 and made the same power (599rwhp).

[tricstar]

thanks for all the input guys, looks like theres still some debate over rear housing sizes and what they are capable of ??

there seems to be quite a few getting 600rwhp from the .83 garrett, so I'm inclined to try that first..

If it doesn't come up to the mark is it as simple as just changing the rear housing to a bigger one ??

[discopotato03]

The facts are that the T04Z's marketed by Garrett and HKS use the exact same cartridge or center section and wheels .

The only difference is that Garrett's housing are generic diesel engine ones where HKS's are petrol performance ones .

The compressor end one is port shrouded so that users can get away with using "response" sized turbine housings on petrol engines and not get compressor surge . From memory HKSs turbine housings are T4 international twin entry mount flange but only have a single passage or scroll within the housing , no doubt its made of some high nickle content iron to cope with high petrol engine EGT where the diesel truck housings are not .

I know people use T3 flanged , T3 Euro flange , housings made for T4 turbines such as the Z turbos P trim but its probably not the way to get the best out of them .

Given a choice the GT4088R is a more modern unit but the word on the net is that some BWs may be better again and cheaper in twin scroll .

Cheers A .

Edited June 10, 2010 by discopotato03

[jonn]

I agree, I went down from the 1.06 to the 0.83 and made the same power (599rwhp).

Paul what was the response like with the smaller housing?

Just a thought Richard does the Turbonetic and Garrett T04 share the same flange size or will they be something completely different?

Edited June 10, 2010 by jonn

[tricstar]

The facts are that the T04Z's marketed by Garrett and HKS use the exact same cartridge or center section and wheels .

The only difference is that Garrett's housing are generic diesel engine ones where HKS's are petrol performance ones .

The compressor end one is port shrouded so that users can get away with using "response" sized turbine housings on petrol engines and not get compressor surge . From memory HKSs turbine housings are T4 international twin entry mount flange but only have a single passage or scroll within the housing , no doubt its made of some high nickle content iron to cope with high petrol engine EGT where the diesel truck housings are not .

I know people use T3 flanged , T3 Euro flange , housings made for T4 turbines such as the Z turbos P trim but its probably not the way to get the best out of them .

Given a choice the GT4088R is a more modern unit but the word on the net is that some BWs may be better again and cheaper in twin scroll .

Cheers A .

Ha Disco, so you reckon the GT4088R would be better at that power--any examples

All this compressor size A/R ? rear housing,, etc etc .. is making my head spin, I just want someone who knows there shit ( about turbos ) to say " for that power with good response you need #### turbo"

even the workshops I've spoken to contradict eachother ??

for those reasons I'll probly end up with a "stone age" TO4Z, because at least I can see some good results in the dyno thread.........

[SimonR32]

garrett t04z with a 0.84 split pulse rear on a 6-boost divided t4 manifold and at least a 44mm external gate

will make between 570-630rwhp at around 24psi

full boost in 4th gear between 3700-4300 on 2.6l

expect a little better response and power on a 2.7l

Edited June 10, 2010 by Cerbera

[tricstar]

garrett t04z with a 0.84 split pulse rear on a 6-boost divided t4 manifold and at least a 44mm external gate

will make between 570-630rwhp at around 24psi

full boost in 4th gear between 3700-4300 on 2.6l

expect a little better response and power on a 2.7l

yeah its a 2.8L

those figures look spot on ! thats nice response for that power--

might lose a bit with the manifold, think its a X-force, but have big external gate..

how much difference would the 6-boost make ? and how much $?

[tricstar]

Paul what was the response like with the smaller housing?

Just a thought Richard does the Turbonetic and Garrett T04 share the same flange size or will they be something completely different?

Hi Jon, yeah I can get a TO4 with same flange etc so i shouldn't need to change anything, the rear is, I thing its called V band, anyway everything should match up.. it'll be a good test mule for your setup if you decide to change...

[discopotato03]

I think you need to decide exactly what power level you want and size the turbo/s 10-15% above that .

I personally think a GT4088R is more modern wheel wise than the Z turbos older T series wheels but the GT turbo is also more expensive .

On an RB26 head I'd look at it like this because this is where the equivalency lies and response can be won and lost .

Std an RB26 is essentially a twin scroll turbo engine that has two scrolls and two waste gates , they happen to be on two individual turbochargers .

To emulate it with a single you again need two scrolls and two waste gates because there is no other way to divide the pulse energy of the front and rear groups of three cylinders .

You can put a single turbo and gate onto it but doing that basically means you're forsaking the low end for the top end and doing it with a lower budget . I really wish people could forget about Hp/Kw numbers and concentrate on torque numbers and the spread of torque .

Anyway what can you afford to spend ? Big twin scroll singles with divided manifolds housings and two gates can help you make big numbers but with 2.6 litres I think it would feel pretty flat till halfway up the rev range .

A 3L bottom end makes it a lot easier to have some mid range because the engine can make it with or without the big blower on the side .

I'm really beginning to think that dirtman is onto something with the twin GT2871R's (GTRS) because he can use a lot more of what Nissan gives him on a 26 so the cost of building it should be less .

It would be really interesting to see the torque differences of twin 2530s GT2860RSs and GTRSs on a reasonably well developed RB26 - porting cams and a decent say 8.75-9.0 static CR .

I realise that singles are easier to work around than the factory twin system but if it were me and I had the engine out of a GTR I would be trying to rehash things to make the turbos easier to work around than they are standard .

In any case if you got them working properly there's no need to fiddle with the things so the complexity wouldn't matter so much . Cops would be able to pick any big single on any RB engine .

A .

[PJ.]

I've driven a couple of twin 2871 setups on both a 2.6L and 3L and was not impressed with the response.

Personally if you want to run a T04Z with a twin scroll manifold I'd go a 1.00 if you want a bit more power, particularly with a stroker, 0.84 for mega response if you're a circuit junkie.

[tricstar]

thanks Disco

well I have 2.8L to help low down..

as far as budget.. the motor is new and all setup for big single, so thats all I want to do at this point, just replace the cooked one thats on it. I'll look intothe GT4088R, but it also comes down to if it will bolt up to what I already have which is I think a split X-force manifold & about a 4inch V-band dump..

anyway Disco what are the specs on the GT4088R I would be looking at for 600+rwhp + best response ( rear etc )

[tricstar]

I've driven a couple of twin 2871 setups on both a 2.6L and 3L and was not impressed with the response.

Personally if you want to run a T04Z with a twin scroll manifold I'd go a 1.00 if you want a bit more power, particularly with a stroker, 0.84 for mega response if you're a circuit junkie.

aaaarr circuit junkie

yeah.want as little lag as possible, some of the events over here ( WA ) are tighter than a #######

[discopotato03]

I started a long post but deleted it because I think cubic dollars can go into a GTR and it could still be beaten by smaller lighter cars .

Long story short are you out to win or track a GTR ?

A .

Edited June 11, 2010 by discopotato03