HYBRID SUBARU/ISUZU TURBOS VF10? VF8?

by **gomulletgo** » Mon Jan 17, 2011 8:55 am

Hi all,

I'm getting thoroughly confused, I was all fired up to buy a first generation (88-93) subaru legacy VF8 turbo for my 2.8 intercooled turbo diesel bighorn, I had read here: viewtopic.php?f=21&t=1054&hilit=vf8 that the exhaust housing simply unbolts off of the subaru turbo, you then bolt the 4JB1-T engines exhaust housing onto the turbo.

I've just called submarine spares (local subaru wrecker) the guy there said that he had tried it and that the VF8 exhaust turbine would not fit in the factory isuzu 4JB1-T exhaust housing. So therefore it is not a simple bolt together hybrid turbo.

I then decided to call one stop turbo shop (local turbo specialist) I asked him if the VF8 turbo minus exhaust housing would bolt straight into the 4JB1-T engines exhaust housing, he said no. He said that you would have to use a VF10 as the VF8 is too big.

Can people please post up their first hand accounts of what they have done. I don't want to buy the wrong turbo.

Thanks in advance

EDIT: I just found this: "The VF8 is the larger of the two turbos - it has a bigger exhaust wheel than the VF10 but is identical otherwise. The "sweet spot"/optimal operating range for the VF-series turbos seems to be between 12 and 18psi " on this site: http://forums.performancecar.co.nz/view ... &sk=t&sd=a

It is food for thought. If the VF8 doesn't fit but the VF10 does perhaps having the smaller exhaust turbine wheel but same compressor wheel size will help the turbo to spool up faster? Better for our engines that are designed for high torque but low redline?

by **Powertruck31** » Mon Jan 17, 2011 9:38 am

The VF10 has the 52 series shaft which came out on early bighorns so is interchangable with the vi83 and vi58. The VF8 has a 10,000 series shaft which will require machining of the turbine housing for it to fit. I run the VF8 turbine wheel machined into a 12r housing which works awsome. Im not using the VF8 compressor wheel im using a 1kz comp wheel which fits the vf8 shaft and is great upgrade but a bit more work involved not a straight swap.
Hope this helps

by **gomulletgo** » Fri Jan 21, 2011 4:04 pm

Powertruck31 wrote:The VF10 has the 52 series shaft which came out on early bighorns so is interchangable with the vi83 and vi58. The VF8 has a 10,000 series shaft which will require machining of the turbine housing for it to fit. I run the VF8 turbine wheel machined into a 12r housing which works awsome. Im not using the VF8 compressor wheel im using a 1kz comp wheel which fits the vf8 shaft and is great upgrade but a bit more work involved not a straight swap.
Hope this helps

That sounds like an interesting setup you have there powertruck

. I may look into a more extreme turbo like that down the track but for now I want a relatively straight forward bolt up swap that will give me some good torque/power and spool up sooner than the factory turbo. Seeing as the VF10 seems to be bolt up from what you have said have you or anyone else on here done this swap? How'd it go? Did it spool up sooner? Produce more torque/power? I'm suprised more info on this swap is not available on here. I mean if it's bolt up and that good, the turbos are cheap, I would have thought everyone would have been into it.

JEBUS! interesting link I just found, 22 pages. http://www.fordlaser.com/viewtopic.php?t=26377

by **Captcol** » Fri Jan 21, 2011 4:19 pm

I will be looking at something similar when the death whine in my turbo becomes terminal

by **Powertruck31** » Sat Jan 22, 2011 9:56 pm

The gains with the VF10 turbo arn't huge as the turbine wheel is the same as the factory isuzu one. The compressor wheel is slightly bigger on the VF10 but its designed to flow more air at high rpm which in a diesel is not what you want. Thats why i have gone to the 1KZ wheel it is alot taller in blade height and pushes alot of air at low rpm. its also alot bigger on the exducer which is where the flow comes from.
The VF10 will go into the isuzu vi83 and vi58 turbo's straight swap but you cant change the compressor covers over as the bearing housings are different between subaru and isuzu.

Hope this helps

by **jellis** » Mon Aug 08, 2011 8:59 am

ok so what do i do.
whats the best / cheapest option
my turbo is starting to give up the good fight
i can get a vf12 turbo for free but im not sure if thats going to be of any use to me.
sorry for resurecting an old thread

MY YouTube · by **pig75** » Mon Aug 08, 2011 9:19 am

If it was me i would just buy one of these http://www.ebay.com.au/itm/RHB5-4JB1T-4 ... 2a12ab1ccf

by **jellis** » Mon Aug 08, 2011 9:34 am

i was looking for the performance upgrade aswell tho.
thanks tho had only seen the complete chinese turbos.
the price of this is right thanks.

by **jellis** » Wed Aug 10, 2011 8:58 pm

eBay has heaps of Chinese ones for cheap.

by **Paulo** » Fri Aug 12, 2011 8:17 am

Check this very interesting setup. Wonder what turbo they used.

by **Paulo** » Fri Aug 12, 2011 8:18 am

OOps here it is the link.
http://www.trademe.co.nz/motors/used-ca ... 662441.htm

by **jellis** » Fri Aug 12, 2011 9:39 am

not to sure what turbo that is im not a fan of the way the intake is done tho
would be pretty easy to fill that with water id imagen

by **Captcol** » Fri Aug 12, 2011 7:05 pm

is stated as a tow vehicle and with a front mount intercooler it probably works okay up there open like that. From what I understand is a bigger turbo may give you more power but it is higher up the rev range than a smaller turbo. Personally i would prefer more grunt down low to help spin the mud out of my 33's. You could pipe it straight accross to a standard snorkle type setup if you wanted and I guess it also depends how much diesel you can get there.

by **mudslinger** » Sat Aug 13, 2011 9:11 am

get a bigger exhaust housing put on it, mines the shop getting a bigger exhaust housing and a touch up

by **Captcol** » Sun Aug 14, 2011 6:34 pm

get a bigger exhaust housing put on it, mines the shop getting a bigger exhaust housing and a touch up

Are you talking about on the standard turbo? so a bigger compressor wheel and housing on the exhaust side?

by **mudslinger** » Mon Aug 15, 2011 8:25 am

standard turbo, he has a bigger housning lying round but i think he is keeping the exhaust wheel the same. if you go bigger wheel means wont boost down low where you need the boost that what he said so with a slightly bigger housing will boost better.

by **BrokenMu** » Wed Aug 31, 2011 9:09 am

Speak to Jarad at Turbo Care.. http://www.turbocare.co.nz/ PH# 3366 9360

He built mine for a VERY reasonable price, it is an upgrade from the standard turbo and bolted straight on.

Vi95 Comp wheel 38.6ind 52.5exd
Vi95 Comp housing
VF8 10,000s Turbine
12R Turbine housing

I did a bit of research when I was in the market for a new turbo and found that the ones for sale these days on eBay and from China are the same as the late Rodeo turbos which are in fact a downgrade from your old standard turbo. They are apparently made this way to meet emissions standards.

regards
Michael

by **Captcol** » Wed Aug 31, 2011 4:52 pm

What figures are you expecting from for the new turbo, HP/Boost/Airflow and what is the ball park cost for a turbo like that?

by **mudslinger** » Wed Aug 31, 2011 5:10 pm

i get mine back from jared tomorrow. i'll find out the specs on it and wat sorta airflow amd boost it will run

by **gomulletgo** » Wed Dec 07, 2011 2:36 pm

mudslinger wrote:i get mine back from jared tomorrow. i'll find out the specs on it and wat sorta airflow amd boost it will run

Hey mate, Just caught up on this thread. I'd be quite interested to check out that hybrid turbo when I see you too

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