4BD1T & 4BD2T Turbos.
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Thread: 4BD1T & 4BD2T Turbos.

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    Default 4BD1T & 4BD2T Turbos.

    The 4BD1T's came with a selection of different turbos depending on their year and original market.

    Early (1985-1986) motors came with an oil cooled IHI-RHB6 turbo for which parts are becoming very rare.
    The major diameters of both it's compressor and turbine wheels are 60mm. It is basically a japanese T3 size turbo. A workable turbo but not very efficient. It produces more backpressure for the same boost than later, more efficient, turbos.
    It is wastegated, the exhaust housing scroll on my 1986 build engine has A/R of 11cm which is equivalent to 0.42 inches A/R. The wastegate should be factory set to approx 12psi.
    The mounting flange on this turbo is split port with 8mm studs on a 73x35mm pattern. It has it's own high mount horizontal manifold. The mount pattern is not compatible with any other common turbo, but T2/T25 turbos can fit if the holes can be slotted.

    A wastegated high mount T25 turbo was used on industrial 4BD1T and 4BG1T engines. The manifold is very similar to the top-mount IHI manifold but features a single port and T25 stud pattern (M8 studs on 73x40mm rectangle). The turbo used on the 4BG1T industrial was a MHI TD04HL-15T-12. This is a low boost turbo that will work in an automotive application but won't realise the performance potential.
    Most T2/T25 turbos will bolt directly to this industrial T2/T25 manifold.

    The later 4BD1T's (post 1988 update) and the early 4BD2T's had a non-wastegated (free floating) TB25. Several model codes exist including 466898 in Bush65's pictures below. It uses a T25 bearing core (water jacketed) and compressor, but has a T3 mounting flange which bolts to the factory manifold at an angle of approx 60 deg.
    This non-wastegated (freefloating) turbo has a large turbine housing (0.87 inch A/R) and sized to run all day long in an NPR at ~3000rpm. It will not provide enough boost at 2000rpm for most swaps into smaller vehicles.

    Some of the later 4BD2 engines (possibly 94+) have a wastegated version of the T25 turbo with a 54mm compressor wheel and 0.67 inch A/R turbine housing. Several model codes exist for these turbos including 465675 and 466409. The CHRA number 430425 on both. This is the best factory turbo and sufficient for mild performance increases over stock. The 4HE1 turbo (model code 700716) with a 60mm compressor wheel uses the same turbine (P/N 435257-0002) and may be a slot in upgrade. Keep the wastegated T3 turbine housing and slot in the 4HE1 turbo.

    To gain more peformance from the 4BD1/4BD2 engines a turbo which provides boost earlier and provides more boost through the rpm range is desirable.
    Many turbos exist from other engines and can be swapped in for a reasonable cost, but all require adaption to the intake manifold.
    Last edited by Dougal; 02-18-2013 at 01:33 PM. Reason: Updated February 2013

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    My 4BD1-T workshop manual only has the IHI turbo. It has a few specs:
    - type RH-B6A
    - max permissible speed (continuous) 130,000
    - pressure ratio (maximum) 2.8
    - exhaust gas temperature 750 C maximum allowable at turbo intake
    - turbo uses imperial sizes for nuts and bolts

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    Turbo Part numbers.

    Factory IHI RHB6
    Turbospec. VI35 8603
    Serial No. RHB6 06088C (this is IHI's part number)
    Parts No. 894422 4980 (this is the Isuzu part number)
    Exhaust housing 11R (this is the A/R ratio)

    An IHI RHB6 I got for parts
    Turbospac. CI60 8809
    Serial No. RHB6 17 0060
    Parts No. 894418 3210 (appears to be an Isuzu number).

    Mounting flange on these IHI turbos is 8mm bolts on a 34x73mm rectangle. It is similar to a T25 but not quite, you can slot a T25 turbo bolt holes to make them fit an IHI manifold.


    High Mount T25.
    Tell me if you have the part numbers for this one or the manifold it fits.
    Mounting flange is 8mm bolts on a 40x73mm rectangle. This is the standard T2/T25/T28 mounting pattern.

    Side Mount TB25 freefloating (no wastegate).
    This turbo is found on later 4BD1 engines, it isn't a sought after turbo, the large exhaust A/R hinders low end response.
    The mounting flange on this one is the garrett T3 pattern, 10mm bolts with 11mm holes on 86x44mm rectangle.
    51.3mm/40mm cold, 60 trim 0.48 A/R cold
    50.6mm/46.1mm hot, 83 trim, 0.89 A/R hot
    Code XD 0219J
    Isuzu 8-9438-290-00
    Garrett 466898-6


    Side Mount TB25 wastegated.
    This turbo is found on early 4BD2 engines, it is a good choice for people wanting to keep their engines stock.
    The mounting flange on this one is the garrett T3 pattern, 10mm bolts with 11mm holes on 86x44mm rectangle.
    51.3mm/40mm cold, 60 trim 0.48 A/R cold
    55mm/42mm hot, 58 trim, 0.67 A/R hot
    Code XE 0201J
    Isuzu 8971056180
    Garrett 466409-1

    Side mounted TB25 wastegated with a larger compressor wheel.
    This turbo is found on some 4BD2 engines, it is similar to the above turbo but has a larger compressor wheel. It is a good choice for people wanting a modest performance increase over stock.
    The mounting flange is also garrett T3.
    Isuzu 466409-002 (info from turbomaster)
    Garrett TB2568
    Stock turbo on later 4BD2T's
    54.3/42mm compressor wheel - 445347-0003
    Turbine 435255-0002 closest in turbomaster is 435237 which is 53/39mm 11 blade
    Turbine A/R 0.67

    The T3 flange, has 10mm bolts on a 86x44mm rectangle. This is a very common mounting flange used by Holset, KKK, Schwitzer and many others.
    Last edited by Dougal; 08-17-2010 at 03:32 PM. Reason: Information updated 18 August 2010

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    IHI RHB6 turbo on a 4BD1T fitted to a landrover.
    The manifold is high mount and the flange is horizontal. On my engine the neck was cut from the manifold and flipped to mount the turbo underneath.
    Attached Images Attached Images

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    T25 industrial high mount manifold. Just like the IHI high mount manifold but with a different port and mounting flange.
    This manifold was used on industrial engines only. 4BD1T and 4BG1T.
    Attached Images Attached Images
    Last edited by Dougal; 02-16-2013 at 07:30 PM.

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    Freefloating (no wastegate) TB25 turbo.
    These have a completely round outlet flange, the dump pipe is bolted to the exhaust manifold.
    The manifold is a side mount with a T3 flange on an angle.
    Attached Images Attached Images

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    Wastegated TB25 turbo.

    Looks just like the freefloating TB25 above except for the dump pipe which bolts on and the wastegate actuator hidden underneath.
    Attached Images Attached Images

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    I have added information on the T2568 turbo which is the 4BD2 wastegated model with a larger 54mm compressor wheel.
    This is the best stock turbo to have.
    Isuzu 4BD1T Junkie.

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    Does anyone know which year trucks used this turbo?

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    Quote Originally Posted by coog View Post
    Does anyone know which year trucks used this turbo?
    Turbomaster say 94 4BD2, but I think it could vary depending on markets.
    How about we get people to post up their engine model, year and codes of the tag on the turbo?
    Isuzu 4BD1T Junkie.

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    Engine: Isuzu 4BD1T
    Year: 1989
    Turbo: Garrett 466898-3
    Waste Gate: No




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    Holset H1C

    Anybody running one of these? A friend gave me one that seems to be recently rebuilt. Non waste gated, but larger than th Garrett

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    Quote Originally Posted by coog View Post
    Holset H1C

    Anybody running one of these? A friend gave me one that seems to be recently rebuilt. Non waste gated, but larger than th Garrett
    Not the H1C, but the later holsets which are essentially an updated version of the same thing get good press. Nexxussion and Carcrafter have both used them.
    Isuzu 4BD1T Junkie.

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    I'd like to try it, but it looks as though I'll have to make a considerable exhaust adaptation to make it work. It looks as though the pipe clamps to the pipe rather than bolting to it.

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    The exhaust pipe actually slips inside the housing with 2 steel rings to seal it.
    Bob

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    Thanks, Bob. Are you familiar with this turbo?

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    Yeh I have a 94 NPR400 at present with this turbo on it and the performance is very good.
    It's done 661,000k's and is still like new I'm more than impressed

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    Apologies if I have this screwed up, but I think coog is talking about a Holset H1C turbo and bobpr is talking about a Garrett turbo, similar to that pictured in my earlier post.

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    Bob's response is helpful nonetheless, as my other option is a Garrett off of a '95 NPR. Space is tight in my van, with the non-waste gated Garrett almost hitting the doghouse. I am putting a 3" exhaust on to let it breathe better, but the turbo just seems to make noise without boost. The local turbo shop has not been able to I.d the application of the Holset, so it may be best to try the Garrett, first.

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    Visited the parts cache today. I'm finding that I have several types of turbos and intakes.It appears that one engine has a top-mount turbo manifold, while the Scout's is purely home-made. Both have IHI turbos.
    Attached Images Attached Images

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    Parts list for the 466409 turbo here:
    This is the 4BD1T/4BD2T wastegated turbo:
    http://www.turbomaster.info/eng/garr...66409-0002.php

    Parts list for the 700716 turbo here:
    This is the 4HE1 wastegated turbo:
    http://www.turbomaster.info/eng/garr...00716-0005.php

    They share an exhaust turbine in common but the 4HE1 turbo has a larger compressor wheel. There is a possibility the 4HE1 turbo cartridge will fit into the 4BD1T/4BD2T exhaust housing and be a plug and play upgrade. I'll see if Astr can give us some measurements.
    Isuzu 4BD1T Junkie.

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    Quote Originally Posted by Dougal View Post
    Parts list for the 466409 turbo here:
    This is the 4BD1T/4BD2T wastegated turbo:
    http://www.turbomaster.info/eng/garr...66409-0002.php

    Parts list for the 700716 turbo here:
    This is the 4HE1 wastegated turbo:
    http://www.turbomaster.info/eng/garr...00716-0005.php

    They share an exhaust turbine in common but the 4HE1 turbo has a larger compressor wheel. There is a possibility the 4HE1 turbo cartridge will fit into the 4BD1T/4BD2T exhaust housing and be a plug and play upgrade. I'll see if Astr can give us some measurements.
    when you say "plug and play" are you thinking that you can just replace the cartridge into the original housing of the 4bd2t turbo and it might fit or would we have to mate the 2 halves together?

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    Vette60, it sounds more like the former (bolt together) but he does qualify it with "possibility" so I take it he hasn't tried it himself, or found anyone claiming to have.

    It is an interesting proposition though as rapid enough spool and more total boost is all I really needed at first.

    My specific application is a bit different than most (still in the NPR, so plenty of aero load at freeway speeds and trying to climb hills @14,500 Lb ish up to roughly 7000 ft of altitude) so twins are in my future (if only for altitude compensation).

    My only concern with the larger turbo (CHRA and compressor) is the attachment to the turbine housing (if it's different at that point between the two, according to the parts list Dougal provided they shuldn't be) and if the compressor housing will clear the exhaust manifold, not that a spacer is that hard to make.
    Last edited by nexxussian; 07-07-2012 at 03:23 PM. Reason: Spllng

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    Quote Originally Posted by VETTE60 View Post
    when you say "plug and play" are you thinking that you can just replace the cartridge into the original housing of the 4bd2t turbo and it might fit or would we have to mate the 2 halves together?
    Yes. Undo the four bolts clamping the turbine housing to the centre cartridge, wiggle it out, slot the next one in and do up the bolts. ASTR has both of these turbos in his parts pile, hopefully he can confirm or deny for us one of these days.

    Even if you want to go for twins, the stock turbo modified should make a good high pressure turbo in a compound set.
    Isuzu 4BD1T Junkie.

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    Quote Originally Posted by Dougal View Post
    Yes. Undo the four bolts clamping the turbine housing to the centre cartridge, wiggle it out, slot the next one in and do up the bolts. ASTR has both of these turbos in his parts pile, hopefully he can confirm or deny for us one of these days.
    To make sure that I understand correctly - you want me to take the compressor section, the turbine wheel and the center bearing section from the 4HE1 turbo and mate that to the turbine housing from a wastegated 4BD1T?
    Andy

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    Quote Originally Posted by astr View Post
    To make sure that I understand correctly - you want me to take the compressor section, the turbine wheel and the center bearing section from the 4HE1 turbo and mate that to the turbine housing from a wastegated 4BD1T?
    I believe he (and he rest of us too ) would like to know if the turbine housing off the 4BD1T will bolt onto the 4HE1 turbo, or does it require machine work?

    Not worth a re-do on mine at this point as I already have Holsets, and no other Garretts, but if you have both, and the time, at least this inquiring mind would love to know (if nothing else it gives an alternative to sometimes hard to source HX30/ HE221).

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    Quote Originally Posted by astr View Post
    To make sure that I understand correctly - you want me to take the compressor section, the turbine wheel and the center bearing section from the 4HE1 turbo and mate that to the turbine housing from a wastegated 4BD1T?
    Yes, that's exactly it.
    The centre-section is held into the turbine housing with four bolts and fish-plates. Undo the bolts and sometimes the centre section will just pull out, worst case some heat on the rim will expand it enough to let-go.
    I know the turbines are the same, it's the diameter of the index on the hot end of the 4HE1 core that I'm not sure about.
    Isuzu 4BD1T Junkie.

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    The loose 4BD1 turbo that I have is non-wastegate. Will that do? I do have a 4BD1 wastegated turbo but it is mounted on a engine so it will take me some time to pull it.
    Andy

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    excited to see if this will work!

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    Quote Originally Posted by astr View Post
    The loose 4BD1 turbo that I have is non-wastegate. Will that do? I do have a 4BD1 wastegated turbo but it is mounted on a engine so it will take me some time to pull it.
    Non-wastegated have a different turbine, so that won't work. It'll have to be the wastegated one when you are ready. Don't suppose your wastegated one is on a drivable engine?
    Isuzu 4BD1T Junkie.

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