Avo Exhaust Housings On Hiflowed Turbo

[LTHL34]

Hey Guys,

I was reading alot of info about Skyline Exhaust Housing and found out that the std housing is to small to make heaps of power. I came across these housing that bolt straight on to the std turbo. I wanted to know if anyone has used these housings before and what power they made? the link to the web site explaining more is http://www.avoturboworld.com/content/view/49/26/ any help will be appreciated.

cheers

[Abo Bob]

How much?

[wolverine]

$700 according to their pdf file

[Cubes]

GTST turbine housing is good for 240-260rwkw ish. i.e GCG

Beyond that just bolt on a GT30r or GT35r with garrets internal gate turbine housing, the M version runs the larger flapper so your able to run less than 1bar and is ~$100 more.

If you wish to bolt a larger turbine housing on the standard RB turbo to gain a little more power it really is a BIG waste of money.

[Haines]

Got one on my 3076r

well at least i think it is

[R31Nismoid]

Hey Guys,

I was reading alot of info about Skyline Exhaust Housing and found out that the std housing is to small to make heaps of power. I came across these housing that bolt straight on to the std turbo.

You realise when you 'hi-flow' a turbo. That the rear housing is no longer standard yes?

Its machined/milled out a substancial amount to accomodate the extra flow that is generated by the larger compressor wheel.

Also a larger turbine wheel (non ceramic) is used.

I think you'd got your information crossed somewhere as the rear housing in 'flowed' form is as good as your going to get from the stock frame turbo before moving upto a GT3X series frame and so on.

[discopotato03]

IMO the std Hitachi turbine housings are fine for what they were intended to do , the fact that there are three sizes available for the same turbine/cartridge is a bonus .

What you need to understand with turbine housings and area radius ratios (A/R ratios) is that they are sized to to achieve a gas velocity range to suit a certain sized turbine and engine . Nissan used the same basic ceramic BB turbine for RB20/25 and the single BB turbo VG30 . So with 2L 2.5L and 3L engines exhausting through them the turbine housings had to grow so as to not choke the larger ones .

Also IMO its a catch 22 trying to make lots of power with the ceramic BB turbos mainly because that ceramic turbine is quite small . When you go up a turbine housing size with them yes the restriction is reduced but then so is the gas velocity to spin them up in the engine speed ranges most road cars are normally used in . In simple terms using say an RB25 turbine housing on an other wise std RB20 turbo means the engine has to rev higher to achive the necessary gas velocity to spin the turbo up or spool if you like .

An interesting thing is that once you go to turbos like for example a GT2530 for an RB25 the compressor wheel is actually slightly smaller than the std Hitachi's but the turbine and its flow range is actually higher . You make more power by letting the engine excite the turbo but with less restriction on the exhaust side , people have for some reason this love affair with big compressors but its critical to get the turbine and its housing right to suit the engine and the compressor .

Your call but if you just want to have a bit more exhaust flow I'd go up a size in Hitachi turbine housings . The advantages are you know it will fit and keep the turbo in its std position (don't need to alter water/oil/air/exhaust fittings) . Also the housings material spec will be some sort of high nickel content iron alloy so should not crack like some aftermarket housings made of lower temp resistant iron . If you shop around you should be able to find a complete 2nd hand turbo or just the housing for a lot less than 700 bucks , I was lucky and via someone elses swap got a complete VG30 turbo with the OP6 housing for I suppose equal to 300 .

All things considered if you want some half serious grunt you are probably better off trying to find a used RB specific HKS GT2530 or at least its turbine housing . Once you have that any GT28 based turbo will bolt to your manifold and std/aftermarket dump pipe .

Cheers A .

[Bass Junky]

Hmmm.

This might be the answer for my choking problem, but at $700 for the housing, plus probably another few hundred for GCG to re-machine to suit the existing turbine wheel, it could become to expensive to be viable.

This is a very interesting thing though.

I will soon be fitting a multi temperature display (from MearCat) to my car and will be able to view Ambient, After Turbo, After Intercooler and Exhaust Gas temp all at once, so I will be taking careful note of the boost level from my high flow where the After Turbo air temp begins spiking, to see whether the compressor side can take any more boost.

If it doesn't run out of puff before the turbine housing runs out of flow, then there is potential for this housing to be trialled.

However, if the compressor is all out of air before the turbine chokes up, then we have reached the limit on the standard compressor side housing.

Food 4 thought.

[Haines]

when i put mine beside the VG30 housing (OP6)

it was bigger

I have a pic here somewhere of the two side by side

and the wastegate hole is bigger

The biggest problem I have at the moment is the wastegate flap is too big for the split dump and is restricting it

after speaking to Michael from BOS he said that the split dumps are more designed for the standard housing and flaps

so this weekend mines getting modified with a bigger wastegate pipe

[180or200]

Hmmm.

This might be the answer for my choking problem, but at $700 for the housing, plus probably another few hundred for GCG to re-machine to suit the existing turbine wheel, it could become to expensive to be viable.

This is a very interesting thing though.

I will soon be fitting a multi temperature display (from MearCat) to my car and will be able to view Ambient, After Turbo, After Intercooler and Exhaust Gas temp all at once, so I will be taking careful note of the boost level from my high flow where the After Turbo air temp begins spiking, to see whether the compressor side can take any more boost.

If it doesn't run out of puff before the turbine housing runs out of flow, then there is potential for this housing to be trialled.

However, if the compressor is all out of air before the turbine chokes up, then we have reached the limit on the standard compressor side housing.

Food 4 thought.

They can be ordered to suit different size wheels, mine was ordered to suit a gt3076 for $480 from ATS

[LTHL34]

Hmmm.

This might be the answer for my choking problem, but at $700 for the housing, plus probably another few hundred for GCG to re-machine to suit the existing turbine wheel, it could become to expensive to be viable.

This is a very interesting thing though.

I will soon be fitting a multi temperature display (from MearCat) to my car and will be able to view Ambient, After Turbo, After Intercooler and Exhaust Gas temp all at once, so I will be taking careful note of the boost level from my high flow where the After Turbo air temp begins spiking, to see whether the compressor side can take any more boost.

If it doesn't run out of puff before the turbine housing runs out of flow, then there is potential for this housing to be trialled.

However, if the compressor is all out of air before the turbine chokes up, then we have reached the limit on the standard compressor side housing.

Food 4 thought.

I spoke to avo myself and they said that for them to re machine it would cost about 850 altogether with fitting it aswell.

The reason why im asking these questions it that i have been told by many mechanics in Melbourne that the housing is a big issue with the rb25 and the rb25 neo. Also that most of the time when someone has got such big power from a std housing that has been re machined that the power reading is wrong. they all said that with the std housing you will not make much power. its just what i have been told thats why i wanted your see if any one else has heard of this.

Thanks guys

[R31Nismoid]

How much power are you talking?

Remember, as i said. In the hi-flows they are not longer a standard housing as they are machined out

[LTHL34]

How much power are you talking?

Remember, as i said. In the hi-flows they are not longer a standard housing as they are machined out

From what i was told is that you can not exceed 210rwkw with the just the housing being machined you need it to be larger. they said that once you change it for example if you put the avo one on there you will atleast get about 260 to 280rwkw.

[oblivo]

I'll be throwing on an AVO GTS 450 this week, complete with discussed housing, so I'll let you know how its entire package goes soon on a GT-T.

[LTHL34]

I'll be throwing on an AVO GTS 450 this week, complete with discussed housing, so I'll let you know how its entire package goes soon on a GT-T.

Im keen to see how it all goes. thanks

[Bass Junky]

Yeah, I'm very interested to see this as well.

LTHL. 210rwkw sounds about right from the STD housing, non high flowed.

My car (and a few other highflows R34s) seem to max out at 250rwkw and this is seemingly due to the exhaust housing.

oblivio we eagerly await your results.

[Haines]

I would like to know for sure if these are the one Morrie @ HPIAB is selling

He told me the housing cost 700 buck so it could be

[Haines]

Not a great pic

but to the naked eye it lookes like the OP6 turbo narrows down abit quicker

[Bass Junky]

What's the AR on the big one?

It's fatter at the snail.

[Haines]

I believe its the AVO housing (.74)

But until I find out for sure where Morrie gets them I cant 100% say it is

Im trying to remember if there was any brandings on the housing

because AVO rings a bell

heres one of the wastegate flaps side by side

also SK may be able to shed some light he told me about a new housing for the highflows that flowed more (+10rwkws)

and this housing could be it