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Thinkin Of Upgrading To A Vg30 Turbo How Much Better Is It?>

Jay_stylz

By Jay_stylz,
in Engines & Forced Induction

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Jay_stylz Proficient

Jay_stylz

Posted
Posted

hey guys thinkin of puttin an vg 30 turbo in my 33 s1.5 do u think it would make much of a difference? would i have ot change many other thing make it run ok? also how hard would it be to install im pretty good when it comes to cars and stuff

discopotato03 Grand Master

discopotato03

Posted
Posted

I think it would be challenging to get 270 Kw's worth of exhaust gas through a VG30 turbine housing .

You can look at a VG30 BB turbo as almost an R33 one but with a slightly smaller compressor wheel and slightly larger ratio turbine housing . They were designed to be a basic low boost turbo upgrade for the 3 liter V6 hence the larger turbine housing for the same sized turbine .

Best performance option using std Hitachi bits is to exchange the turbine housing on the 33's turbo for the VG30 one . Largest turbine housing , 33's turbo already has the larger comp wheel thought the 34GTt may have a larger compressor housing , can't remember .

Cheers A .

W0rp3D Grand Master

W0rp3D

Posted
Posted
I think it would be challenging to get 270 Kw's worth of exhaust gas through a VG30 turbine housing .

The turbo i have on my car now did 260 on another car when it was first made.

By the time you rebuild it and spend the money on a hiflow you could of picked up a decent KKR turbo that would outperform it easily.

Have a search through the forums for KKR, they are junk, need lots of boost for not much power and they are very laggy.

W0rp3D Grand Master

W0rp3D

Posted
Posted
You just posted what a VG30 Turbo can be described as, almost word for word.

Compared to a standard turbo? yes you could, now go off and read what people think of the kkr after using one and then compare them to the views from people using a vg30 rear housing, i can gaurentee you a lot more people are happy with there vg30 than a kkr, whislt you at it research what happens when you put bigger bits on your standard turbo to get more power.

Parag0n Mentor

Parag0n

Posted
Posted
Compared to a standard turbo? yes you could, now go off and read what people think of the kkr after using one and then compare them to the views from people using a vg30 rear housing, i can gaurentee you a lot more people are happy with there vg30 than a kkr, whislt you at it research what happens when you put bigger bits on your standard turbo to get more power.

No need to research, have owned VG30DET/RB20/RB25/RB26 powered vehicles before.

Thanks for the tip though bud.

hypergear Grand Master

hypergear

Posted
Posted

I thought the VG30det's got a .63 turbine housing. If its true high flowing it with a Cropped TA34 turbine with 52T 76mm or a 56T 71mm comp wheel using a .60 comp housing and a strong actuator should crack just over 270rwkws.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Disco - the OP6 housing of the VG/R34GT-t turbo can get to 270rwkw off the GCG items.

That is probably the utter limit though, i've never seen anyone post a more powerful result, most come in around 260-270rwkw @ 20psi give/take.

So that would seem to be the limits reached.

By the time you rebuild it and spend the money on a hiflow you could of picked up a decent KKR turbo that would outperform it easily.

A GCG hi-flow of a VG30 turbo is going to be out performed by a KKR turbo?

:thumbsup: That is... Impossible.

discopotato03 Grand Master

discopotato03

Posted
Posted

Well personally I think you're better off using a Garrett GT30 turbine housing because they are designed for a GT30 turbine .

Also only the ball bearing T series turbos use those TB31/TA34 turbines , the real GT28 or 30's use GT28 NS111 turbines or GT30 UHP ones .

All there really is to gain by using a VG30 turbine housing on a Garrett BB cartridge is the std position and format dump pipe . If you go aftermarket then there isn't any reason not to use an aftermarket one for the Garrett T housing .

Again personally I would not buy an aftermarket "VG" style turbine housing when there is Garrett IW ones available and designed to work with their cartridges and wheels . Also the Garrett GT30 housings are made of high temp resistant materials for petrol apps , not so sure about the aftermarket VG30 type thing . Also available in a range of sizes too .

Your calls , cheers A .

hypergear Grand Master

hypergear

Posted
Posted

Disco:

Since we are talking about the turbine wheels and obviously your self works in the turbo industry. Would you think the Factory Garrett GT30 turbine wheels would out flow the TA34 turbines with crop for high flowing applications? The GT30 turbine is obviously lighter in weight and spools faster. Just have to go through the trouble of installing a custom shaft for sleeve bearing high flowing options.

discopotato03 Grand Master

discopotato03

Posted
Posted

Actually I don't work in that industry .

I think the GT30 turbine was designed to be low restriction for its ~ 60mm size and the largish 84 trim size and high inducer tips seem to be the way to go about doing that .

If you wanted something in the generic T3/small frame T4 shaft size you gould look into the GT32 plain bearing turbines . I think these are in the 64mm OD range and from memory the trim size is a bit smaller than 84 . I have no idea how heavy they are and I'd say they would be in lower temp spec material being a diesel turbo .

Cropping or back cutting turbine blades is one way of removing some of the restriction but its also removing some of the sail area used to drive the compressor wheel . Again from memory TA34 turbines went up to 76 trim which is what the street crowd call stage 3 .

Maybe something else to look at is the turbine used in the Buick Grand National , a long long time since I've seen one but if still available at least they are a Garrett petrol app turbine .

The problem as I see it is that bush bearing high flows are difficult to get right because wheels big enough to make adequate grunt are held back a bit by bush bearing oil sheer drag initially . I don't know if bush bearing GT series turbos are any better off in this area , maybe playing with a GT3268 or 71 cartridge could give the answer to that one .

Cheers A .

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