Q: IHI RHB5/RHB6 Spec's
10-16-2003, 07:54 PM
#1
0.5 BAR
Thread Starter
Join Date: Mar 2003
Posts: 116
Q: IHI RHB5/RHB6 Spec's
Hey,
I've just bought a '91 Subaru Legacy Turbo, as a winter beater
It comes stock with the IHI RHB5 turbo. This turbo boosts at about 8 PSI. It's max capability is about 12-13 PSI.
I'm wondering, whether I'd get more boost with an IHI RHB6 turbo, and whether this turbo would bolt-on to my application. Also, any extra info such as the compressor maps/max boost info comparisons between the IHI RHB5/RHB6 would be greatly appreciated.
Last, but not least, I'd like to know whether the IHI RHB6 compressor housing would bolt onto the IHI RHB5 exhaust housing and the mid-section. What boost gains would such a hybrid turbo create. Would it spool up faster than a "stock" RHB5?
Thanks in advance,
P.
I've just bought a '91 Subaru Legacy Turbo, as a winter beater
It comes stock with the IHI RHB5 turbo. This turbo boosts at about 8 PSI. It's max capability is about 12-13 PSI. I'm wondering, whether I'd get more boost with an IHI RHB6 turbo, and whether this turbo would bolt-on to my application. Also, any extra info such as the compressor maps/max boost info comparisons between the IHI RHB5/RHB6 would be greatly appreciated.
Last, but not least, I'd like to know whether the IHI RHB6 compressor housing would bolt onto the IHI RHB5 exhaust housing and the mid-section. What boost gains would such a hybrid turbo create. Would it spool up faster than a "stock" RHB5?
Thanks in advance,
P.
10-16-2003, 09:26 PM
#3
1.0 BAR
Join Date: Dec 2002
Posts: 590
Re:Q: IHI RHB5/RHB6 Spec's
Well I don't know about compatibility, but the an RHb5/6 combo would spool at the same rate as your rhb5 but push more CFM and have a 'wider' flow map. Sorry I can't help with the actual specs but if you could it would be easy to push more boost and CFM.
10-16-2003, 10:04 PM
#4
0.5 BAR
Join Date: May 2003
Posts: 152
Re:Q: IHI RHB5/RHB6 Spec's
the IHI 5/6 parts are not interchangeable. The RHB5 came in many different sizes and configurations.
Some of the RHB5s are very small. The VJ11 from Probe/Mx6 should be good for 12 psi and to 7k+ on a 1.6, same with some of the subaru units. Some of the Isuzu units had a very small compressor, I-marks I think.
The centre section from a T-bird should be pretty much a bolt in affair and is about 15-20% bigger than the probe/suby units. This would let you run at 15psi all day long
Neil
Some of the RHB5s are very small. The VJ11 from Probe/Mx6 should be good for 12 psi and to 7k+ on a 1.6, same with some of the subaru units. Some of the Isuzu units had a very small compressor, I-marks I think.
The centre section from a T-bird should be pretty much a bolt in affair and is about 15-20% bigger than the probe/suby units. This would let you run at 15psi all day long
Neil
10-17-2003, 08:36 AM
#5
3.0 BAR
Join Date: Dec 2002
Posts: 3,703
Re:Q: IHI RHB5/RHB6 Spec's
Those Legacy Turbo's are really rare to find in I would mess with it not just as a beater, built that sleeper. Yes the T-bird turbo can be used with the Rhb5 to make a hybrid turbo that will push more air.
10-17-2003, 01:56 PM
#6
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Thread Starter
Join Date: Mar 2003
Posts: 116
Re:Q: IHI RHB5/RHB6 Spec's
First of all, thanks for all of the replies.
I did some research on the RHB5/RHB6 hybrid turbo idea, and it's definitely a no-go. The RHB6 Compressor is TOTALLY different than the RHB5 compressor. It would be impossible to interchange them.
I have a different question now. I've seen a turbo on a Ford T-Bird, but I could swear that it wasn't an IHI RHB5 and that it was some kind of a Garret T3...
Which turbo comes "stock" on the T-Bird? Does anyone have specs/pics of that turbo?
If I was to build a "hybrid" turbo from my Legacy IHI RHB5 exhaust housing, mid-section and the T-Bird Compressor, what parts would I need from the T-bird turbo? (Just the compressor housing, backing plate, or would I also need the "wheel" off the T-Bird Turbo?)\
Wouldn't it be simpler to just put in a T-Bird turbo into the Legacy...? Would the T-Bird turbo bolt-on in the Legacy?
What power gains should I expect with such an upgrage, with a fuel system, which will deliver the additional fuel to compensate for the increase in air...?
(Stock HP is 165 and the torque is 181lb)
TIA
P.
I did some research on the RHB5/RHB6 hybrid turbo idea, and it's definitely a no-go. The RHB6 Compressor is TOTALLY different than the RHB5 compressor. It would be impossible to interchange them.
I have a different question now. I've seen a turbo on a Ford T-Bird, but I could swear that it wasn't an IHI RHB5 and that it was some kind of a Garret T3...
Which turbo comes "stock" on the T-Bird? Does anyone have specs/pics of that turbo?
If I was to build a "hybrid" turbo from my Legacy IHI RHB5 exhaust housing, mid-section and the T-Bird Compressor, what parts would I need from the T-bird turbo? (Just the compressor housing, backing plate, or would I also need the "wheel" off the T-Bird Turbo?)\
Wouldn't it be simpler to just put in a T-Bird turbo into the Legacy...? Would the T-Bird turbo bolt-on in the Legacy?
What power gains should I expect with such an upgrage, with a fuel system, which will deliver the additional fuel to compensate for the increase in air...?
(Stock HP is 165 and the torque is 181lb)
TIA
P.
10-17-2003, 03:14 PM
#7
0.5 BAR
Join Date: Jan 2003
Posts: 115
Re:Q: IHI RHB5/RHB6 Spec's
All the spec could be find here : http://www.geocities.com/ttskipp/turbochargers.htm
10-18-2003, 08:20 AM
#10
0.5 BAR
Join Date: May 2003
Posts: 152
Re:Q: IHI RHB5/RHB6 Spec's
the t-birds came with a weird IHI, it has the same center section as any other IHI, but it has an exhaust turbine housing with a T3 flange. The IHI only came on 87/88 turbocoupes, the earlier ones had a Garrett.
You need the compressor wheel/turbine and housing, that's it. If you can find one with a good centre section then it would be easier to just swap the centre section than to rebuild your turbo with the t-bird parts.
It would be alot of work to install the complete t-bird IHI unit, about the same as a T3 conversion.
Neil
You need the compressor wheel/turbine and housing, that's it. If you can find one with a good centre section then it would be easier to just swap the centre section than to rebuild your turbo with the t-bird parts.
It would be alot of work to install the complete t-bird IHI unit, about the same as a T3 conversion.
Neil
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