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1989 Jeep Wagoneer, 360v8, 727, stock for now,
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An HX35 would turn a 4B into a smoker. HX35 is too big for a 4B unless it's a race motor. For the 4bT use a HX30super or a HE221.
 
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Discussion Starter #3
But that's not a normal hx35. It's a 54/55/8. I'm using a 44mm hx30 now it's a good turbo. But I never seen that hx35 before.
 

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I ran a HX35 with a single scroll 8cm housing,it was better that with the 12cm but still hot and smokey until well beyond the 4BT's useful RPM range.
 
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But that's not a normal hx35. It's a 54/55/8. I'm using a 44mm hx30 now it's a good turbo. But I never seen that hx35 before.
A tighter turbine is only half the issue. The HX35 compressor is too big so runs low boost and poor efficiency at 4BT airflow.

If you're going to run a 4BT in a boat at higher rpm a HX35 with a tighter turbine will work. That's pretty much what Cummins specced on the 250hp marine engines.
 

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Discussion Starter #6
Right so really hx30 is about the best before going to twins. I really wish I had the room for twins. Really wish I would have gotten the hx30super lol.
 

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If you have the 44 mm HX30W then you have an excellent turbo for that engine. You could go to the Super HX30W but would require a bit of plumbing mods. The super has a 4" intake instead of 3", the outlet elbow is the same as an HX35W, and a different oil line connection. If twins were in your future the 44 mm is the best.
 
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