IHI turbo experience? (1 Viewer)

[lynchmob]

I have an IHI turbo that I bought a few years ago to put on my BJ75. With all the other turbo threads going on these days Im wondering if this turbo is any good or the right size.

The model is RHB6. Its not listed on their site as a current model.

I got it used on ebay - seems to be in great shape, though the exhaust inlet seems to be a bit small. The seller claimed it came from a 4cly diesel Iveco delivery truck (similar to an NPR). Google search shows this turbo used on all kinds of things.

Ill post a pic later and try to find the specs - I believe they are stamped on the wheels.

 

[Dougal]

I have one, they were factory fitted to the Isuzu 4BD1T in the mid 80's.

It's basically a japanese T3, has 60mm compressor and turbine wheels. Mine has the equivalent of a 0.42 A/R turbine housing which on a 4BD1T starts to spool about 1400rpm and hits 15psi a bit after 2000rpm.
Factory setting was supposed to be 12psi, but mine was set to 25psi, the wastegate had never opened. I cut the wastegate arm and welded in a threaded adjustable section. Lets me wind the boost from 0-18psi (max it will boost to on the 4BD1T with stock fueling).

Good turbo, but almost impossible to find parts for. I have a chewed up compressor wheel which I cannot get a replacement for. My turbo has done approx 300,000km and still works great (other than the compressor wheel).

But I'm replacing it with a garrett T25 for spare parts availability. A T25 with a 0.48 A/R turbine housing will spool at the same RPM.

 

[prado t]

I had an IHI on a 89.5 probe turbo gt great dont know if it is the same, the compressor seals like to go if proper cool down procedure is ignored. In the tuner car magazines a company called APEX uses IHI brand turbo. There is a company in Newestminster called SPECIALTY ENGINEERING that can get parts for any turbo if needed.
aaron kuit
the APEX IHI is called the RX 6

 

[Dougal]

I had an IHI on a 89.5 probe turbo gt great dont know if it is the same,

It's not the same. Most IHI automotive turbos are RHB5 or RHF5 (newer). The RHB6 is larger and was only used on the Isuzu 4BD1T engine and a daihatsu rocky 2.8 diesel.
It's not a case of finding a parts supplier either, IHI have told me the only parts available for this turbo are rebuild kits (bearings/seals). If you want anything else you have to find a secondhand turbo to pilfer parts from.

The Apex turbo is completely different too.

 

[lynchmob]

Thanks for the responses.

So given the responses from Dougal. This may be a size good turbo to try on a 3B ?? I did also see some info on line claiming this model turbo was used on a 2l fiat engine.
Guess I really need to take some measurements and see if there are any useful numbers on it.
The area where the specs would normally be stamped is blank. The turbo appears to be nearly new. There is no shaft play at all and the housing is really clean. I would have to fab some sort of exhaust outlet as the one with it is not routed very well. Ill post a pic tomorrow.

 

[RufusTheDufus]

I spent some time tonight cleaning up the numbers on my IHI turbo to see what it is. It's an RHB6. Part of the Advanced Turbo Systems (New Zealand) kit for the 3B. There's no waste gate in the ATS design. The exhaust outlet is a solid steel plate where the waste gate housing looks like it would be.

I put a boost gauge on a couple of weeks ago. This turbo seems to top out at about 8 psi. If I really push it in the lower gears I get it it to peak at 10. Cruising 55 MPH in 4th gear (4 speed tranny, 4.11s with 33") it hovers around 4psi. Any uphill grades and the power drops off almost instantly. I'm going to cut the muffler off soon, hopefully that helps.

I bought an Autometer pyro for it but it was defective and I had to send it back to Autometer for replacement. When I have some EGT data I'll post it.

At the moment it seems like the turbo is too big for the 3B. I'm typically only getting 8 psi with no waste gate. I suppose I cna crank up the fuel. I may after the pyro is installed.

 

[Dougal]

I spent some time tonight cleaning up the numbers on my IHI turbo to see what it is. It's an RHB6. Part of the Advanced Turbo Systems (New Zealand) kit for the 3B. There's no waste gate in the ATS design. The exhaust outlet is a solid steel plate where the waste gate housing looks like it would be.

I put a boost gauge on a couple of weeks ago. This turbo seems to top out at about 8 psi. If I really push it in the lower gears I get it it to peak at 10. Cruising 55 MPH in 4th gear (4 speed tranny, 4.11s with 33") it hovers around 4psi. Any uphill grades and the power drops off almost instantly. I'm going to cut the muffler off soon, hopefully that helps.

I bought an Autometer pyro for it but it was defective and I had to send it back to Autometer for replacement. When I have some EGT data I'll post it.

At the moment it seems like the turbo is too big for the 3B. I'm typically only getting 8 psi with no waste gate. I suppose I cna crank up the fuel. I may after the pyro is installed.

There should be some numbers on the exhaust housing by the mounting flange.
They are a metric equivalent of the A/R ratio that garrett and others use. My old turbo had 11R cast into it.

 

[RufusTheDufus]

I see something there but I can't read it from the angle I have without removing the air cleaner box. I'm kinda curious.

 

[RufusTheDufus]

I finally got around to installing the replacement pyro from Autometer a couple of days ago. The probe is mounted post-turbo about an 1" from the turbine before the elbow starts. I can only get the temp to about 950 trying hard, like lugging in 4th gear uphill.

I'm kinda surprised that I can only get a consistent 8 psi out of it. It's like there's a wastegate set at 8psi but there's no wastegate visible that I can see. (It would have to be hidden inside the exhaust housing and have some kind of internal pressure feedback plumbing which I've never seen before in a turbo.)

This has me thinking that something is wrong. Either the muffler is too restrictive, the intake or air filter is too restrictive or there's just so much blow-by that it can't develop much pressure. It's hard to know.

 

[Dougal]

Got photos of this turbo?

 

[RufusTheDufus]

Sorry, I didn't mean to bump this old thread up. I accidentally replied here and deleted the post.

I can certainly make photos of it.

 

[Tparty]

I have one, they were factory fitted to the Isuzu 4BD1T in the mid 80's.

It's basically a japanese T3, has 60mm compressor and turbine wheels. Mine has the equivalent of a 0.42 A/R turbine housing which on a 4BD1T starts to spool about 1400rpm and hits 15psi a bit after 2000rpm.
Factory setting was supposed to be 12psi, but mine was set to 25psi, the wastegate had never opened. I cut the wastegate arm and welded in a threaded adjustable section. Lets me wind the boost from 0-18psi (max it will boost to on the 4BD1T with stock fueling).

Good turbo, but almost impossible to find parts for. I have a chewed up compressor wheel which I cannot get a replacement for. My turbo has done approx 300,000km and still works great (other than the compressor wheel).

But I'm replacing it with a garrett T25 for spare parts availability. A T25 with a 0.48 A/R turbine housing will spool at the same RPM.

Hey Dougal i know this post if from ages ago, but do you remember where you got the smaller turbine housing from for the ihi? i have the same turbo on my 3b and struggling with building boost with the compressor and turbine both .60.

cheers!

 

[Dougal]

Hey Dougal i know this post if from ages ago, but do you remember where you got the smaller turbine housing from for the ihi? i have the same turbo on my 3b and struggling with building boost with the compressor and turbine both .60.

cheers!

The 11R housing was factory. At the time (mid 80's) I'm sure there were other housings available. But now it's going to be easier to find a better turbo.
Garrett GT2052 was a good match which dozens have used at my suggestion. There are MHI options too.