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I am new to this forum and joined because I have had this idea stuck in my head for a long time and i have even drawn some variations up. I have a 2000 f250 with the 7.3l powerstroke. the only thing done to it is a 4in turbo-back straight pipe exhuast and the wastegate is wired shut. The truck comes stock with an 80mm turbo and gets plenty of air as it is but i was wondering if it would be beneficial to add a centrifugal supercharger onto the belt assembly feeding the turbo? I have done some research but most of what i could find is on small gas cars that are looking to make 5psi at 5000rpms. My theory behind this is that (with the right size supercharger and gear ratio) the supercharger would be producing some boost all the time, even at idle, helping to spool the turbo faster and improve throttle response.

Not really interested in the cost. this is more of a concept.
Any input on this idea??
 

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Wired the WG shut? :doh:
There's been some threads on it, and even youtube videos. I think it was kind of a good idea but only in theory. It didn't seem to work to great.
 

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If any at all, a roots blower would likely work better but only if you are working with a lot of fuel. There are single turbo setups that will work fine.

The roots blower was originally on detroit 2 stroke diesels. I have a friend that had a pulling tractor with twin turbos pushing into the throat of the blower on a 92 series. It was mean but I feel fairly unnessecary.
 

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It's been done on the 6.0 a few times and most who tried it ripped it out and went back to turbo only. I always questioned the reasoning behind it because a centrifugal charger makes boost in direct relation to engine rpm. It would make more sense with a twin screw since that design makes more boost right away. Anyway the right turbo setup will spool almost instantly and ultimately make more power.
 

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I'm actually collecting parts to do exactly this. I don't know why more people haven't chimed in on this, its actually an idea that's been gaining a lot of ground recently. With the supercharger feeding the turbo, you have almost instant boost on the bottom end and throttle response improves tremendously. The thing is a lot of blowers out there will end up robbing the engine of too much power to make the end gain worth the cost and work. A Procharger on the other hand only uses up 30hp, if that, and you get a much more effective set up... not to mention it takes up a lot less room than a more "standard" blower. Empire actually offers a kit with everything you need to run a Procharger to turbo setup for around $5k.
I'll come back and post a link to the build thread I make when I start the build in a few weeks. FWIW I'll be using an F1C or F1D Procharger and a Garrett GT42 ball bearing turbo.
Hop on google and search for "procharger 7.3 diesel" or similar and you'll find plenty of info and videos.
 

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Gaining ground? The 7.3 just in SDs is 13 yrs old, not going all the way back to the 94.5s. It's been done but just not a lot because of what's involved and because it's not just super amazing.
 

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Anything is possible and totally depends on how deep your pockets are :D
 

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Been done......check out Empire Diesel




It's been done on the 6.0 a few times and most who tried it ripped it out and went back to turbo only. I always questioned the reasoning behind it because a centrifugal charger makes boost in direct relation to engine rpm. It would make more sense with a twin screw since that design makes more boost right away. Anyway the right turbo setup will spool almost instantly and ultimately make more power.
But Mitch is right.......
 

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I remember a few years back a guy in Fla doing a twin turbo setup on a Ford GT (GT40) that made 1400 some odd HP. When it blew he built a new motor and twin turbo'd it through a twin screw blower. That setup didn't quite reach 1100HP.

A twin screw is nice for instant torque but it is always going to run out of steam on the big end compared to a turbo setup. That and the more boost you try to run thru a supercharger the more parasitic hp you loose trying to spin it. I don't know of any supercharger setups out there capable of making 50psi or more boost and it is pretty easy to do that with turbos. And I am not talking about Funny Cars and Dragsters.

A really big twin screw like a 4.3L would be a neat experiment all by itself but making an intercooled manifold for it would be really expensive.

A centrifugal blower makes no sense to me at all since it is basically a belt driven turbo. It suffers the parasitic loss that all blowers suffer from and it makes it's best power at max rpm. A turbo doesn't suffer the parasitic loss and once spooled is making full boost. A centrifugal blower makes some sense for a hot street/race car but other than that they suck.

And when they ran a GT500 KR at Sebring a couple years ago it couldn't complete 1 circuit and it was heat soaked and done.

I'll stick with the turbo myself.
 

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The procharger feeding into a turbo is an awesome design. You just have to know what turbo and procharger to run. Empire has done it. OP What truck are you referring to that has an 80mm turbo stock? To have a truck with supporting mods to handle a procharger and the cost of the kit you are north of $10k. Unless you are wanting serious power and having the capability of 0 lag off the line, this route is pointless.
 

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I may be wrong but I am almost 100% sure that the turbo needs to feed the supercharger for it to work best.
That is how the diesels were setup back in the day on big rigs and i have see a couple setups on gas and diesel trucks.
 

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Look at empire diesel. They feed a f1 procharger into a turbo. Look on youtube for procharged powerstroke. You have a procharger for instant off the line boost and a turbo for up top. It allows you to run a little bigger turbo without worrying about lag down low.
 

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yes i have seen there kits and they have at least some of them setup like i said . look at "buddys 7.3 turbo clearly feeding supercharger. also blower max... in the procharger pic section they have one or two feeding the turbo

Guess theres more than one way to skin the proverbial cat
 

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If any at all, a roots blower would likely work better but only if you are working with a lot of fuel. There are single turbo setups that will work fine.

The roots blower was originally on detroit 2 stroke diesels. I have a friend that had a pulling tractor with twin turbos pushing into the throat of the blower on a 92 series. It was mean but I feel fairly unnessecary.

The 92 series detroits had a turbo and supercharger stock... those trucks wont run without the supercharger going.
 

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Blowing into the Supercharger with a Turbo
Detroit Diesel’s two-stroke engines made this setup popular, but it’s also one of the least efficient. Blowers take a lot of power to drive, so putting one downstream of a turbocharger only makes things worse. In addition, most roots or screw superchargers have oiling issues if you try to push more than about 15 psi into them. Centrifugal blowers don’t fare any better, as they will take more power to drive, and the front compressor cover can pop off when pressurized. The only way we would suggest this type of setup is with some type of bypass that circumvents the blower entirely when the turbo is creating boost.

Read more: Supercharge Your Diesel Truck! - Diesel Power Magazine

So like I said you use a supercharger feeding into a turbo. You run a turbo that may not be as easy to spool down low and you have a procharger to help with down low boost then the turbo spools and you have your high end boost.

I don't often go by anything that DP mag says, but in this case it's true. I have a good bit of research into this as I will eventually put a procharger feeding into the turbo on my truck.
 

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Hmm since this has there been more people using the the procharger set up?
 

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Not many people at all have used it. Ideally you would have billet rods and such to run it (on a 7.3) since it gives you the ability to make power down low, also the kit is $5000+ so for that you can run a really good single turbo (gtx, 467, etc.) and make a lot of power. It would make for a mean street toy but I wouldn't run it without a built motor.
 

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Cool I plan on building a block up.. I like the idea of instant spool.. plus I love the sound.. so what are some negatives of a setup like this? Other than building the block? I'm looking to support 3xx/2xx I wanna shoot into the 600 area on fuel.. I'm not gonna do this over night so I've got time to build.. also why twins over procharging?
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Really isn't much down side other than maintance on the procharger. You will need a full built block to be safe with a procharger setup, down low power is what kills the 7.3 block so you have to build it to actually handle a lot of down low power. Becuase from idle up you have power with a procharger setup where with a single turbo at 1700+ is when you start getting boost and pulling hard.
 

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Hmm.. Ok thats what I thought.. I was thinking like a long block from swamps thats built for high hp.. and maybe a girdle..
 
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