Thread: Which turbo can I get away with

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Originally Posted by Bush65

(Edit: Holset HY35 are available cheap in USA because the dodge owners pull them from their Cummins to fit something larger).
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A Holset HY35 looks like a very feasible option

Getting one over here seems to be a tad harder, there are a few on US ebay, but no one wants to sell them internationally.


Of course if I had MOPAR parts in the landy I might turn full blown redneck and don the General Lee on the roof

Other cheap options a Garret T28 ball bearing turbine a ricer mate has in his shed or a smaller T15 but I feel this would be too small for my application

Here is a list of Holset turbos used on the Dodge Rams. The ones that are recommended as best for a Cummins 4BT (which is very similar to Isuzu 4BD1T) are HY35 from 03 and 04 Ram. Also search for HE341CW much the same as the HY35. 9 cm^2 turbine and 58 mm compressor wheel. They go for about US $200.

These turbos make great boost and spool up quickly on a Cummins 4BT with adjustments to the injection pump. They should work well on a 4BD1, which is better in many ways compared to the 4BT.

Edit: Sorry forgot to add list.

Holset HY35


My turbo (GT2560r)


GT28RS



So it would seem that ~20psi is the best I can hope for from my turbo.

Looking at those maps, it looks like the HY35 should spool up later than a GT28RS???

Holset HY35W on a 4BD2TC.

I am in a bit of disbelief about the quotes off boost pressures from 30 to 60 psi, that seems abit far fetched to me. Can anyone explain how this is possable

Originally Posted by lambrover

I am in a bit of disbelief about the quotes off boost pressures from 30 to 60 psi, that seems abit far fetched to me. Can anyone explain how this is possable

What do you not believe???

Many modern truck engines run 30-40psi boost as standard.

Even the nissan ZD30 with a variable vane turbo runs low 20's.

Videos are on youtube (and linked here) of the twin turbo 4BD1T in an F100 hitting 60psi.

I think they can do it because Petrol engines are different to Diesels. Petrol engines compress a mixture of air and fuel. If you tried run that kind of boost in a petrol engine the air/fuel mixture would pre ignite. Diesels work by compressing a volume of air and the fuel is then injected into the hot compressed gas where is combusts. So in a diesel you control the combustion timing by when you introduce the fuel. As a result, if you can supply the correct amount of fuel (keep the air/fuel ratios correct) its then just a matter of how strong the engine is in order to hold those levels of boost.

a ZD30 is a moden engine compared to a 4bd1 and was designed around those parameters thus the compression, head design, head bolt position tension, injection timing, bearings the block was all designed to be turboed at higher boost pressure.

I have been reading the info from this site about turboing a 4bd1 as I have one in the shed to fit to my county. I was speaking to a landrover mechanic the other week and mentioned the boost pressures claimed on this site and he said no way could the engine handle those pressures.

So is it the general concensis that on standard internals rods pistons that with a fuel tweak and an exhaust upgrade you can run 0 to 60 psi boost through this motor. I know these motors are strong but to me it seems to far fetched.

Originally Posted by lambrover

a ZD30 is a moden engine compared to a 4bd1 and was designed around those parameters thus the compression, head design, head bolt position tension, injection timing, bearings the block was all designed to be turboed at higher boost pressure.

I have been reading the info from this site about turboing a 4bd1 as I have one in the shed to fit to my county. I was speaking to a landrover mechanic the other week and mentioned the boost pressures claimed on this site and he said no way could the engine handle those pressures.

So is it the general concensis that on standard internals rods pistons that with a fuel tweak and an exhaust upgrade you can run 0 to 60 psi boost through this motor. I know these motors are strong but to me it seems to far fetched.

60 psi maybe a bit over the top, but plenty are doing it , check out some of the USA sites.

the biggest advantage is that it is so strong and the fuel pump is capable of so much more that so much has been done to these motors