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Discussion Starter #1
So I was scrolling through the internet and I found an hx35super. I never heard of one. How well would this be on a 4bt. It's supposedly has a 8cm exhaust housing. https://www.ebay.com/i/292033711652?chn=ps&dispItem=1&ul_ref=http%3A%2F%2Frover.ebay.com%2Frover%2F1%2F711-117182-37290-0%2F2%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.com%252Fi%252F292033711652%253Fchn%253Dps%2526dispItem%253D1%26itemid%3D292033711652%26targetid%3D353574098844%26device%3Dm%26adtype%3Dpla%26googleloc%3D1017542%26poi%3D%26campaignid%3D853313736%26adgroupid%3D41805390205%26rlsatarget%3Dpla-353574098844%26abcId%3D1128836%26merchantid%3D114699932%26gclid%3DCK6up5_bwNQCFQkQaQodm0gC1w%26ul_ref%3Dhttp%25253A%25252F%25252Frover.ebay.com%25252Frover%25252F0%25252F0%25252F99%25253Floc%25253Dhttp%2525253A%2525252F%2525252Frover.ebay.com%2525252Frover%2525252F1%2525252F711-117182-37290-0%2525252F2%2525253Fmpre%2525253Dhttps%252525253A%252525252F%252525252Fwww.ebay.com%252525252Fi%252525252F292033711652%252525253Fchn%252525253Dps%2525252526dispItem%252525253D1%25252526itemid%2525253D292033711652%25252526targetid%2525253D353574098844%25252526device%2525253Dm%25252526adtype%2525253Dpla%25252526googleloc%2525253D1017542%25252526poi%2525253D%25252526campaignid%2525253D853313736%25252526adgroupid%2525253D41805390205%25252526rlsatarget%2525253Dpla-353574098844%25252526abcId%2525253D1128836%25252526merchantid%2525253D114699932%25252526gclid%2525253DCK6up5_bwNQCFQkQaQodm0gC1w%252526rvr_id%25253D0%26srcrot%3D711-117182-37290-0%26rvr_id%3D1233372588100
 

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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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