discopotato03 Posted May 11, 2008 Share Posted May 11, 2008 Hi all , I was sniffing around Turbo masters site at VF turbos for Subaru and noticed that the turbine (exhaust) housing A/R size was shown as 15 for the VF3 and VF6 where the others ie VF2/VF4 is shown as 12 . I think with IHI turbos they are said to have an "R" number cast into the side of them amongst other figures near the housings mounting flange . Also at times people here in Australia have come across EA82T headers with a larger hole at the top of the up pipe - maybe slightly larger uppie inside - who knows ... Anyhow I'm curious to know if the AWD Spider Turbo Vortexes (XT4) used the slightly different header and slightly larger turbo exhaust housing to help grunt the heavier car along . If anyone knows anything about the larger (R15 ?) exhaust housing can they let me know . Cheers , Adrian in Australia . Link to comment Share on other sites More sharing options...
joostvdw Posted May 11, 2008 Share Posted May 11, 2008 I have a 1988 XT turbo with what I believe is an VF7 so I will check for any numbers on it and report back to you. But I won't be near my car untill wednesday so you'll hear from me then. Link to comment Share on other sites More sharing options...
Gloyale Posted May 11, 2008 Share Posted May 11, 2008 Also at times people here in Australia have come across EA82T headers with a larger hole at the top of the up pipe - maybe slightly larger uppie inside - who knows ... Anyhow I'm curious to know if the AWD Spider Turbo Vortexes (XT4) used the slightly different header and slightly larger turbo exhaust housing to help grunt the heavier car along . I don't know about the Turbo housings, but I know that there are 2 different headers. Here in the states, the XT (vortex) got the larger header. GL turbos (sedans, wagons) used the smaller pipe, I think to increase pressure on the low end for a faster spool up on the heavier car. All XT Turbos, AWD or not got he larger header here. BTW, the difference is about 1/8 inch diameter. Link to comment Share on other sites More sharing options...
discopotato03 Posted May 12, 2008 Author Share Posted May 12, 2008 That's most interesting , so it's a given that the XT header has a ~ 1/8" larger up pipe all the way down to that horrible "T" piece ? The VF3 and VF6 I'll have to search for . It could be either flanged like an EA82 turbo or an EJ20 one - no proof either way yet . Can anyone tell me if any early generation EJ20 turbo engine used a VF3 or 6 ? Cheers A . Link to comment Share on other sites More sharing options...
joostvdw Posted May 12, 2008 Share Posted May 12, 2008 the early gen EJ20s are found in legacy turbos here and as far as I know they have the VF12 (may be VF10 or VF11 depending on year and or market) and definately not the old VF7 Link to comment Share on other sites More sharing options...
Gloyale Posted May 12, 2008 Share Posted May 12, 2008 That's most interesting , so it's a given that the XT header has a ~ 1/8" larger up pipe all the way down to that horrible "T" piece ? Actually, to me it appears that only the outlet after the *y* to the turbo is larger. The rest of the header appears to be the same size piping. Link to comment Share on other sites More sharing options...
discopotato03 Posted May 13, 2008 Author Share Posted May 13, 2008 I had a feeling it would only be the up pipe section . I got my engine builder to check my XT4 engine's turbo and its a VF5 with the R12 turbine housing . Bugger ! I was hoping it had the larger R15 housing from the EA82 VF3/VF6 . Just on that Turbomaster's site reckons the 87 XT4 Turbo should have a VF6 so if anyone has one it would be interesting to know . Cheers A . Link to comment Share on other sites More sharing options...
joostvdw Posted May 14, 2008 Share Posted May 14, 2008 Intrigued by your questions I had a look on the website of a respectable turbo rebuilder in the Netherlands and they confirm your data. The 1985 models have RBH52VF3 (orig part number 14412AA010) The 1987 models have RBH52VF6 (orig part number 14412AA011) Sadly I have no conclusive power figures for the different years of engines. I do know that the 1987+ XTs has 136hp stock. (with a cat but no O2 sensor) Link to comment Share on other sites More sharing options...
joostvdw Posted May 17, 2008 Share Posted May 17, 2008 I just checked and my '88 turbo has a VF7 R15, I doesn't actually say VF7 on it, but it does say R15. Link to comment Share on other sites More sharing options...
discopotato03 Posted May 17, 2008 Author Share Posted May 17, 2008 My 1987 Aus spec FSM/WSM shows different power specs for RX L's in different countries , the ones that didn't require cat conversters show higher out puts - they had slightly different cam profiles as well . Maybe these are the ones with the larger A/R turbine housings . I'll have to check which turbo my 86 RX has on it . Cheers A . Link to comment Share on other sites More sharing options...
discopotato03 Posted March 30, 2009 Author Share Posted March 30, 2009 I couldn't get at the part number but it def has an R12 turbine housing . Can anyone confirm that all/most 88+ XT4's have the R15 turbine housing on their VF7's ? Would love to get my hands on one of those EA82 R15 turbine housings if anyone has one or a turbo with an uncracked one to sell . The high comp 87 (modded 8.6 CR) Vortex engine I had built really needs a bit more housing volume , it's interesting that the factory power spec is 136 hp . Better than the L 105 EA82T spec . Cheers Adrian . Link to comment Share on other sites More sharing options...
joostvdw Posted March 30, 2009 Share Posted March 30, 2009 I couldn't get at the part number but it def has an R12 turbine housing . Can anyone confirm that all/most 88+ XT4's have the R15 turbine housing on their VF7's ? Would love to get my hands on one of those EA82 R15 turbine housings if anyone has one or a turbo with an uncracked one to sell . The high comp 87 (modded 8.6 CR) Vortex engine I had built really needs a bit more housing volume , it's interesting that the factory power spec is 136 hp . Better than the L 105 EA82T spec . Cheers Adrian . something like this? It's the stock turbo on an EDM '88 XT turbo which is rated at 136hp WITH catalytic converter. My specific car was delivered without the cat and without O2 sensor, so should have something above that rating. Link to comment Share on other sites More sharing options...
discopotato03 Posted March 30, 2009 Author Share Posted March 30, 2009 Yes , that would be it . By any chance can we please have the numbers off the compressor housing ID pad so that I can differentiate these turbos from the ADM and USDM ones with the 12R turbine housing . Long shot I know but I don't suppose you'd be willing to part with it , I'm a good payer ! Cheers Adrian . Also is it possible to see a few more pics a little further back so we can see the whole housing . Link to comment Share on other sites More sharing options...
joostvdw Posted March 30, 2009 Share Posted March 30, 2009 (edited) Yes , that would be it . By any chance can we please have the numbers off the compressor housing ID pad so that I can differentiate these turbos from the ADM and USDM ones with the 12R turbine housing . Long shot I know but I don't suppose you'd be willing to part with it , I'm a good payer ! Cheers Adrian . Also is it possible to see a few more pics a little further back so we can see the whole housing . I have a spare turbo laying at my parents house, I will be there this weekend so I can take a few more detailed pictures (including the ID pad which I can't see when it's mounted) for you. I'm not going to part with this one sorry. The spare turbo has a cracked exhaust housing so that's no good to you as well. I can take a few pictures while it's mounted in the car, but I don't thing you will learn anything from that, it just looks like a turbo edit: I just remembered, I took some pictures while the engine was out for headgaskets last summer. I can't really read the numbers on the ID tag, but maybe with some photoshopping? edit2: I remembered something else I still have the original picture, which is bigger than the one on photobucket, so I enlarged it and cropped the section with the ID tag Edited March 30, 2009 by joostvdw Link to comment Share on other sites More sharing options...
discopotato03 Posted March 31, 2009 Author Share Posted March 31, 2009 I gather that these are pictures of the cracked spare , and thats also an R15 turbine housing ? Eyes still crossed but . Turbo spec VF68719 Serial Number RHB5 263154 Part Number 14412AA011 Are these cars/turbos rare birds where you are or unobtanium ? Cheers A . Link to comment Share on other sites More sharing options...
discopotato03 Posted March 31, 2009 Author Share Posted March 31, 2009 Ok from Turbomaster the R15 units full part number is RHB52EW-52002EP15NRBREL3911EZ . The alphabet and a few more ... W for watercooled , 5200 for the turbine I think , 15 for the turbine housing size and 3911EZ AFAIK the compressor wheel . Cheers A . Link to comment Share on other sites More sharing options...
joostvdw Posted March 31, 2009 Share Posted March 31, 2009 I gather that these are pictures of the cracked spare , and thats also an R15 turbine housing ? Eyes still crossed but . Turbo spec VF68719 Serial Number RHB5 263154 Part Number 14412AA011 Are these cars/turbos rare birds where you are or unobtanium ? Cheers A . Yes these are pictures of the cracked spare. And they are pretty dang hard to find. As you've found out the bigger R15 turbo was only put on the '87,5+ XT turbo models. And since there were only 33 or so XT's sold here and about 7 left, parts are far and few between, even moreso for the '87,5+ models. I know of only 1 '87,5+ model XT turbo in this country, and that's mine I do happen to know that the ford probe turbo (the rounder later model) has the same RHB5 core as the subarus, so that may have a bigger hot side? Link to comment Share on other sites More sharing options...
ausubaru92 Posted April 1, 2009 Share Posted April 1, 2009 I still dont see why you dont want to use a newer turbo like the TF035 or TD04L or similar. They are so much easier to come by. And because they use a different up pipe flange, it gives you an excuse to upgrade your up-pipe. What will a rare as hens teeth VF6 give you that a TF035 (that flowed enough air to make 170Hp) wont? Link to comment Share on other sites More sharing options...
discopotato03 Posted April 1, 2009 Author Share Posted April 1, 2009 (edited) I have searched long and hard for info on reasonably common RHB5 turbos here and in the US - and Mitsy TD04 family turbos . TD04Ls dont do it for me and the TD04HL turbine housing is unobtaneium here . Not impressed with MHIs wheels or trims . Basically the EA82 R15 turbine housing allows you to bolt a VF10 directly to an EA82 and if you use the EA82s front elbow on a reclocked compressor housing it all fits together . In case you didn't know the VF4/6/7 uses the same profile turbine as a VF10 , the main differences are the 10's 56mm comp exducer rather than the 4/6/7s 52mm and the larger A/R compressor housing aside from the R15 turbine housing . EA82Ts have very agricultural headers and if you change the up pipe section I think you'd alter the manifold pressure seen by the alternate exhaust ports . I like the older VF 5/10 bladed compressors too . At this stage a flange converted exhaust and std VF10 looks like being the go . Oh and where a VF10 goes a VF8 or VF8 with a VF10's compressor and housing goes . A . Edited April 1, 2009 by discopotato03 Link to comment Share on other sites More sharing options...
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