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Compound setup. ProCharger feeding turbo?

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Old Dec 3, 2020 | 08:40 AM
  #21  
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Originally Posted by jaydubb
So I guess the myth that you NEED a Tig welder to weld aluminum is BUSTED. LOL!
I don't know when that rumor came about, you can get aluminum stick welding electrodes.
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Old Dec 3, 2020 | 08:42 AM
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Originally Posted by SLOW SEDAN
Identical except for how long they last... ebay 7875 broke on me pretty quick. VSR has lasted years, plus I have the dual vband turbine thats not on the ebay units. I have zero desire to ever go back to a typical turbo flange again.

Link to the $100 manifolds? I know you can get the flowtech style cheap but not these that I’ve seen:
I was talking about the Flowtech style ones. They were briefly less than $90 shipped.
Sucks your ebay 7875 didn't last, maybe it was just a fluke? I know a ton of people running them now with no reported issues.
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Old Dec 3, 2020 | 09:22 AM
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Originally Posted by AwesomeAuto
I was talking about the Flowtech style ones. They were briefly less than $90 shipped.
Sucks your ebay 7875 didn't last, maybe it was just a fluke? I know a ton of people running them now with no reported issues.
Pretty sure my next build will use the flowtech style since I recently made room for them. But the ones I posted have proven to work well in G8's and clear low mount alternators, fox bodies, C6's (with a tweak to clear steering), and CTSV's.

I'm not mad at it, but $100 more for nicer VSR unit won't break the bank. Plus buying a dual vband turbine housing alone would cost more.
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Old Dec 3, 2020 | 09:26 AM
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Originally Posted by SLOW SEDAN
I'm not mad at it, but $100 more for nicer VSR unit won't break the bank. Plus buying a dual vband turbine housing alone would cost more.
The Gen 1 7875s, both cast and billet, are being discontinued at VSR.
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Old Dec 3, 2020 | 09:28 AM
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Originally Posted by SLOW SEDAN
I like fabbing my own vs getting a kit, not only cheaper but you can really make things fit where you want. The fairly cheap ebay forward turbo manifolds work great and have held up well even hanging a 70lb turbo on them, no cracking or anything. The $300 Holley flowtech work great too if you can make them fit. Fabbing pipes for single vs twins can go either way, I made at least 5 kits during covid from high mount small single, large single, low mount single, rear mount, then to large twins. I almost think the large twins was the easiest packaging and I was able to fit two mufflers with them but it just depends on how much room you have. Don't be scared of the cheaper VSR turbos either, they work great and the dual vband turbines make packaging very sleek and spool quick. Even a fairly small one will probably make 150-200hp more than the P1 (not sure what your goals are).
I agree on building my own setup, I work as a tech/fabricator by trade, but Im so busy working on customer vehicles I don't make time for my personal projects! All those bills dont pay themselves..
I actually enjoy fabbing setups by just buying the most critical components. I had to build my own headers for my LS swap in my Tacoma in order to make them clear such a tight engine bay.
And I am planning on building the setup with V-bands, makes it much easier, even if I need to weld on my own to the cast hotside. Just makes it much nice when it comes time for maintenance.
My car makes 630rwhp now and my goal was closer to 8-900 at the tires.
I want to run a rear mount on my Tacoma swap since packaging makes it pretty hard to fit under the hood, but have plenty of space under the bed. I just need to look up the proper pumps for the oil scavenging system, sump, turbo sizing etc...I've never built a rear mount setup so Ill have to do some more reading to make that happen.
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Old Dec 3, 2020 | 09:31 AM
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Originally Posted by jaydubb
Ahhhhh... I dont know why I thought you were LS swapped... Does this work for you? https://www.cxracing.com/products-by...0-V-TT-GT35-T4

Or this? https://www.cxracing.com/products-by...-CAMARO6769-IC
Those are the headers I was talking about, the thing I dont love about them is how close they sit to the valve covers and I run tall ones like pictured due to my valvetrain braces.
But yeah that has some parts that would get me started on the setup.
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Old Dec 3, 2020 | 09:38 AM
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Originally Posted by chuntington101
Have you not considered just upgrading the Procharger to a p1x or D1x? They seem to be making a loads of power and would need less fab work?
Originally Posted by SLOW SEDAN
Agree, just depends what he's looking for. The D1X has made ~900hp leaning on it pretty good and costs $3,200 for head unit alone which he can offset selling his P1.




You NEED it if your trying to win a SEMA build off or do a chromoly cage, but for day to day tasks you can easily get by with a simple unit.
I checked on the D1x head unit and was just over $3k, I guess I could do that but Id honestly rather go turbo with room to crank it up.
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Old Dec 3, 2020 | 10:00 AM
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Does anyone have links to the V-band headers (SBC if you know of any) and those turbos with V-band on hotsides?
Im going to start collecting some parts for the new setup. I'm running the old Holley 950 commander MPFI system, so I might see if I can upgrade the software to the terminator X as well for better control.
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Old Dec 3, 2020 | 10:10 AM
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https://www.holley.com/products/exha...8aAvSiEALw_wcB

Amazon Amazon

Amazon Amazon

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Old Dec 3, 2020 | 10:11 AM
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Originally Posted by AwesomeAuto
The Gen 1 7875s, both cast and billet, are being discontinued at VSR.
Yup, thats why I got the gen 2's which are cheap too. Plus I don't recall any of the gen 1 having dual vband housings, that was a nextgen, gen2/2.5 thing.

Originally Posted by Speed Freek
I checked on the D1x head unit and was just over $3k, I guess I could do that but Id honestly rather go turbo with room to crank it up.
Turbos are a ton more fun!
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Old Dec 3, 2020 | 01:02 PM
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Originally Posted by Speed Freek
Ok so as the title states, I currently have a P1SC ProCharger and have it making 16 psi and its spinning about as fast as it can. I've got a large A2A Intercooler and its time for some more power.
Was just gonna pull the ProCharger off and sell it but got to thinking about possibly feeding the turbo from the ProCharger to get it to spool up quicker and make more boost.
I've seen plenty of setups using positive displacement SCs but havent seen a whole lot on centrifugal type blowers.
BTW this is all on a built SBC in my 67' Camaro.
To do it right, you would want to blow the turbos through the Procharger and then to the IC/engine. That way the blower would be less of a restriction.
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Old Dec 3, 2020 | 01:05 PM
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Originally Posted by AwesomeAuto
I don't know when that rumor came about, you can get aluminum stick welding electrodes.
You can gas weld it too....

It's a metal, it melts...many things can weld it if you're not that fussy really lol
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Old Dec 3, 2020 | 06:36 PM
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Originally Posted by stevieturbo
To do it right, you would want to blow the turbos through the Procharger and then to the IC/engine. That way the blower would be less of a restriction.
Have you seen any setups doing so? I like science projects, but always nice to see someone else did it before I did!
It was a MFer getting that LS motor in my Tacoma, haha...I had nobody to piggyback off of!
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Old Dec 3, 2020 | 07:11 PM
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Originally Posted by Speed Freek
Ok so as the title states, I currently have a P1SC ProCharger and have it making 16 psi and its spinning about as fast as it can. I've got a large A2A Intercooler and its time for some more power.
Was just gonna pull the ProCharger off and sell it but got to thinking about possibly feeding the turbo from the ProCharger to get it to spool up quicker and make more boost.
I've seen plenty of setups using positive displacement SCs but havent seen a whole lot on centrifugal type blowers.
BTW this is all on a built SBC in my 67' Camaro.
You could do it. It was done a long time ago. The two most common WW II airplane engines, the Allison V-1710 and the Rolls-Royce Merlins had multi-stage superchargers. This was to overcome the loss of air density at altitude.

So, you could do it, the concept is proven, but you are better off selling the P-1SC and getting a bigger unit.

Last edited by SteveJewels; Dec 4, 2020 at 05:27 AM.
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Old Dec 3, 2020 | 10:31 PM
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You only make as much power as the atmosphere blower can push... no matter how many times you compound that air mass, it is still the same amount of air.

And, you can stick and a2a intercooler between the blower and the turbo, then use an a2w intercooler in the intake hooked up to your air conditioner.
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Old Dec 4, 2020 | 09:19 AM
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Originally Posted by Speed Freek
Have you seen any setups doing so? I like science projects, but always nice to see someone else did it before I did!
It was a MFer getting that LS motor in my Tacoma, haha...I had nobody to piggyback off of!
I've seen a centri and a Roots, and turbos and roots, but not specifically turbos and a centri. Although when I was changing from YSi to twins, I did actually build my own setup with the blower still in place, so I could have run both if I really wanted. Just figured it would have been more hassle than it was worth though, as wanted to free up space up top with the removal of the blower.

But if I got a cheap LSA or something, I'd like to try with a big set of twins and a 2350 or something. Just not sure how much the 2350 might restrict up top though even with the turbos blowing through it
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Old Dec 4, 2020 | 09:21 AM
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Originally Posted by Speed Freek
Have you seen any setups doing so? I like science projects, but always nice to see someone else did it before I did!
It was a MFer getting that LS motor in my Tacoma, haha...I had nobody to piggyback off of!



Ultimately are either worth it ? Really depends on your patience, budget and any goals.

Or here's a very old one from Sweden I think, Opel Manta with a Volvo engine, and a turbo and roots.

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Old Dec 4, 2020 | 09:57 AM
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Banks have just done a video on a compound diesel (turbos to Whipple SC). It didn’t turn out too well.


if you wanted to do it right you would need to copy the VW system and run the SC first blowing into the turbos with a bypass (to ambient air). Then once the turbos come online they can 100% take over the boost duties and the SC is just left spinning. See this setup by Norris designs on a 4G63t.

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Old Dec 4, 2020 | 11:51 AM
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The "right" way, would be bypassing the blower entirely, and clutching it so it does not spin.

But the "right" way, and what is technically and easily achievable are not always compatible.
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Old Dec 4, 2020 | 12:06 PM
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Originally Posted by stevieturbo
But if I got a cheap LSA or something, I'd like to try with a big set of twins and a 2350 or something. Just not sure how much the 2350 might restrict up top though even with the turbos blowing through it
Its been tried a few times with LSA and LSA style blowers, blower still got in the way and the vehicles went faster on turbo alone. The CTSV wagon that runs half mile comes to mind with the large rear mount and they tried keeping the blower at first. Some Benz guys tried large turbos blowing through the E55 blower awhile ago as well.
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