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This is a thread for ideas and possibly a build. It is something I have wanted to do for a long time. Mostly due to observing the success that the Cummins guys have had with moderate compounds. Seems to always be confronted by "run a big single" "hope ya got $20k laying around" or "wont fit". All likely true with the 7.3.
I have got a couple of ideas and some spare turbo parts laying around. Could easily build another T4 kit but want to try something different. The truck is a 2000 Excursion that does some light towing but is mainly a DD. Wanted to get a thread started before I jump into it as build threads prove to be extremely helpful to all.
Last edited by Y2KW57; Dec 4, 2020 at 05:32 PM.
Reason: Title changed per OP's request
The reason a Cummins has so many compound turbo options is because its inline layout provides a lot of room on its side. I think you would need to do a fuel bowl delete and find a way to mount the HPOP on the front of the engine (as In overhanging the water pump) to get enough room to mount two turbos in tandem in the valley. Another option is to twincharge it with a belt-driven supercharger/turbocharger combo. The easiest thing to do perhaps if you don't want to engage in a lot of NRE (non-recurring engineering) is to perform a Fummins conversion.
EDIT: What if you have two small turbos, one at each exhaust manifold, that feed into the big turbo in the valley? The 1999.5-2001 Audi S4 had a pair of KKK K03 turbos (commonly upgraded to K04) feeding a 2.7L engine. Without looking at maps, I'm guessing something like a Garrett GT2560R would be about right. Just don't do rear mounted turbos.
The reason a Cummins has so many compound turbo options is because its inline layout provides a lot of room on its side. I think you would need to do a fuel bowl delete and find a way to mount the HPOP on the front of the engine (as In overhanging the water pump) to get enough room to mount two turbos in tandem in the valley. Another option is to twincharge it with a belt-driven supercharger/turbocharger combo. The easiest thing to do perhaps if you don't want to engage in a lot of NRE (non-recurring engineering) is to perform a Fummins conversion.
EDIT: What if you have two small turbos, one at each exhaust manifold, that feed into the big turbo in the valley? The 1999.5-2001 Audi S4 had a pair of KKK K03 turbos (commonly upgraded to K04) feeding a 2.7L engine. Without looking at maps, I'm guessing something like a Garrett GT2560R would be about right. Just don't do rear mounted turbos.
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Ideally I would like to only move the batteries and cold pipe for the intercooler. Have stared at it a lot and it will take some creative thinking, main reason I would like to keep it T4 as well. "Valley" turbo is a GTP38/.84, it has an ATS ported (4") housing, 360* bearing, S300 turbine wheel and a 9+0 billet compressor. Thought is to try and keep the internal wastegate and cross drill the WG port in the housing. Reason for this logic is many 12v Cummins guys cross drill the WG port on the standard Holset HX35 and run it as the high pressure in compounds with an internal gate.
Please nobody have a stroke or fall out...but check out some Duramax Forums...there are guys running compounds on their Duramax...Which would have some of the same packaging issues as a Powerstroke, being a V style engine with a valley mounted factory turbo set up. The idea above of a super/turbo combo might be something to look into. Gale Banks is doing something like that right now with an L5P Duramax they are trying to put together for a Monster Truck application. I believe what he is doing is using the supercharger to blow into a big turbo. The "triple" turbo also sounds interesting...run a small turbo on each bank feeding a big boy in the valley.
Ideally I would like to only move the batteries and cold pipe for the intercooler. Have stared at it a lot and it will take some creative thinking, main reason I would like to keep it T4 as well. "Valley" turbo is a GTP38/.84, it has an ATS ported (4") housing, 360* bearing, S300 turbine wheel and a 9+0 billet compressor. Thought is to try and keep the internal wastegate and cross drill the WG port in the housing. Reason for this logic is many 12v Cummins guys cross drill the WG port on the standard Holset HX35 and run it as the high pressure in compounds with an internal gate.
I'm not sure I understand the moving the battery and cold pipe part. Can you elaborate please?
On second thoughts, let's just stack the turbos vertically and have them sticking up out of the cowl/hood.
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