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GCG Bolt on turbos


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2 hours ago, ginganinja said:

If not the VF22. out of interest what would you recommend for around 230-250kw.

 

 

I personally don't think any VF turbo will make that power... not on your motor in any case. If I was you I would be looking for the most modern VF bolt on turbo available.

I would say you'll get better spool, better mid range torque and... probably be just as good up top... and if it's slightly less up top... who cares as it's a tiny little turbo that dies rapidly past 6500 rpm anyway.

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12 hours ago, Andy_Mac said:

 

It's the comp and turbine wheel sizes. 53mm comp inducer and 53mm turbine exducer.

^ My understanding too

 

What was Niran's old set up making, whatever the v12 sti run VF wise + water meth was ~250 from memory. That's probably the most i've seen a VF make, but W/M does comes with other issues.

Edited by pl0x
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1 minute ago, pl0x said:

^ My understanding too

 

What was Niran's old set up making, whatever the v12 sti run VF wise + water meth was ~250 from memory.

 

The V11’s with the TS VF49 or SS whatever it is, make 225wkw with very little effort, or 230+ depending on some other factors. The factory SS headers are trash so people pick up a fair bit when swapping them out. 

 

I feel like Niran’s one already had moderate cams aswell which would have helped.

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I have spoken with Diesel and turbo in wellington and just found out some further information. IHI build a VF48 Performance which has a larger billet compressor wheel compared to the standard VF48. It is similar size to the VF22 possibly bigger. But it is a journal bearing turbo. So that could be another option for a late model factory turbo.

 

https://www.ihi.co.jp/itsj/en/products/high_performance/vf48/

 

https://www.full-race.com/store/subaru/gr-wrx-sti-lgt-2008-2017/gr-wrx-sti-ej25-recommended-turbos/ihi-performance-vf48-high-flow-turbo-upgrade-for-04-19-sti-and-04-07-wrx/

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6 hours ago, ginganinja said:

I have spoken with Diesel and turbo in wellington and just found out some further information. IHI build a VF48 Performance which has a larger billet compressor wheel compared to the standard VF48. It is similar size to the VF22 possibly bigger. But it is a journal bearing turbo. So that could be another option for a late model factory turbo.

 

https://www.ihi.co.jp/itsj/en/products/high_performance/vf48/

 

https://www.full-race.com/store/subaru/gr-wrx-sti-lgt-2008-2017/gr-wrx-sti-ej25-recommended-turbos/ihi-performance-vf48-high-flow-turbo-upgrade-for-04-19-sti-and-04-07-wrx/

 

very nice. should come in a bit under $2000 delivered from full-race. Did Diesel and Turbo have a price?

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17 minutes ago, Loren said:

 

very nice. should come in a bit under $2000 delivered from full-race. Did Diesel and Turbo have a price?

Diesel and turbo quoted $2125 incl gst. Which I thought is reasonable for a genuine OEM upgraded item.

 

It is journal bearing, but is there really that much difference in the torque curve between journal and ball bearing turbos this small? To clarify my thoughts would a journal bearing bring torque on more progressively compared to the spike you get with the likes of the VF22? Or is that thinking totally up the whack.

 

19 minutes ago, Gripless said:

That sounds pretty good, but seems like Steve March would do similar and built form an old turbo would be cheaper since you already have the core.

But that could mean waiting for some time I've heard. Also does he replace the whole core? Or just the wheels and bearings?. 

 

I know I've read differently on another thread in this forum, but both alltech and Diesel and turbo said the ball bearing cores of VF22 can't be rebuilt. However apparently IHI turbo parts are hard to get so this could be why.

 

Since we are on the topic I may as well post this. During my research I have found this company in America which seems legitimate from their eBay listings that sells IHI core assemblies.

 

https://www.ebay.com/itm/NEW-IHI-RHF5HB-Turbo-CHRA-Subaru-Impreza-WRX-STi-EJ20-EJ20G-EJ20E-F52CAD-S0065C/174155135097?pageci=09efe7a1-10de-41da-9304-9489304e2398

 

Pretty sure my VF22 P20 rear housing would go straight onto this. The VF22 front cover is too big, but would a VF28 compressor slide on with some machining????  No doubt the machining would need to be perfect! End result would be almost a VF34. Dont think I will be going down this track but while I was researching and throwing ideas around last night I thought it was interesting all the same.

 

 

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Another random idea.......... is it possible to machine the P20 ball bearing exhaust housing to fit the likes of that journal bearing VF48 high flow turbo. It probably defeats the purpose of what the pros at IHI sort out to achieve with the VF48.

 

But..... if the P20 housing could be made to fit, would that result in a late model technology responsive VF22 equivalent? Stretch the top end out a little bit more.

 

(I know it sounds like I can't get over the VF22😄 but its just interesting throwing ideas around all the same)

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