Well while researching on turbo's on yahoo , I bumped up on a GTX egroups that I am actually a member off and I did a search on the VJ20 turbo to see what was spoken about in the past.
egroups site GTX mazda

Well I found out that the VF8 turbo Compressor side can be mated to the VJ20 turbine housing ...
According the posts that I read the VF8 features a ball bearing turbine which the VJ20 would need some machineing to accept and the VF8 has a larger flow rate than the VJ20 and the complete set up would be equivalent to a T3 turbo (midsize).
I am still researching this and looking into it more. So don't bash me anyone ....
I posted the link to the site and you can do a search on there and keep readint the posts and you will come across the same items that I have ....
Something to help us go faster ....
Bruce

 

Now I just read a post by the same guy that a VF10 can be used and it supposedly may bolt up to the VJ20 , I have emailed him with respect to this subject and requesting some more info , cause I need to know more
Bruce

 

I made mistake with upgrade on mine ihi turbo and its very hard to make high hp#'s with ihi vj 20 or vf 10. the problem with with them is too small exaust housing.u will gain peak hp wich is around mid power band like 3500 rpms and then power will drop. Upgrade compresor housing will flowmore air but thesame air u pump into engine it has to come out and ihi exaust housing is a big restrictor.U want a turbo that will make power at higher rpms not mid range.

 

Hey Bruce, sounds you and I are at the same stage of the learning curve, although I think you're slightly ahead of me ... I just figured out that's there's two parts to IHI turbos, lol! When I've been surfing eBay I see a lot of IHI RHB5 turbo that look like they'd work, but don't have the same exhaust housing, and then you've got to get the downpipe adapter (?), some I'm confused most of the time with what I'm looking at !

Btw, whatever happened with those Escort VJ-20 parts the guy was selling here?

 

ok , well after speaking with Steve Spiers (guy from New Zealand) he was basically telling me that we could fit up a VF8 or VF10 to our GTX manifolds. I know he was saying something about the exhaust housing having to be modified due to the bigger turbine. But I have to make sense of this more myself before i really go into detail .. I will post some pics of his VF10 and VF8(bigger turbo) when I get home.
Bruce

 

Any pics yet? I called Corksport and they said they *might* have a VJ-20 next week for $350. Btw, I like your new avatar !

 

How much HP can a VJ20 effectivley support?? What cars did the VF8 come on??

Thanks!!

 

I believe he told me it came on a subaru lagacy turbo , but I would have to look into it some more