Thread: isuzu 4db1 turbo manifold

There are two different manifolds that I know of, the one with the horizontal mounting surface for the turbo and the one with the angled surface, I think this one is the one that will suit more (better ? ) turbos.

Cheers, Murray

This is the other type - it is higher and has the turbo level with the top studs. It has a T25 flange.



(ignore the calliper)

Which one you choose I guess is down to what you can find and how you want to fit things in your engine bay. I have this later type as it lines the turbo up with my intercooler (and it was what I could find at the time).

While I have the later 'puma' style bonnet without the WTA intercooler over the head you can fit a turbo under the bonnet with the high type manifold.

I bought a batch of these a few years ago when I did my conversion. I'm going to off load the lot on eBay. PM me in the next week if your interested. I need to fund some repairs.

so what style do you have

Most are this type with the Garrett t25 flange. One has the split flange, which is the IHI type I think.

image-290556487.jpg

Looking at those pictures, are there three possible factory turbo manifolds?
I'm currently in possession of the angled one and the upturned one with a split in it, the latter was looking like my best option for my current conversion, however the one in your picture without the split, looks like it has a different flange fitting.
Is it exactly the same as the split one, or does it differ slightly in one plane?

Ps. Sorry to but in!

Here is a better photo to compare the two:


image-3682423168.jpg

The T25 opening is probably slightly bigger overall. The IHI opening is slightly wider than T25 but narrower the other way.

Originally Posted by puma130tc

Looking at those pictures, are there three possible factory turbo manifolds?
I'm currently in possession of the angled one and the upturned one with a split in it, the latter was looking like my best option for my current conversion, however the one in your picture without the split, looks like it has a different flange fitting.
Is it exactly the same as the split one, or does it differ slightly in one plane?

Ps. Sorry to but in!

The t25 manifold was used on industrial 4bg1t and 4BD1T engines only. Absolutely no problems using it, but you won't find one on a truck engine.

The ihi bolt pattern is different. But you can slot the holes in t25 turbos to make them fit. That is what I'm running.