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[rammertide07]

Originally Posted by TwinTurbo

Just want to clear up this statement a bit - first I'm not sure what setup you were looking at but I don't think you could set them up this way, the setups I've seen the turbos feed the supercharger - so at low boost from the turbos the supercharger is creating a vacuum on the compressor wheels and basically making them freewheel. As heat and RPM build the exhaust begins to spin the freewheeling turbos faster and provide more air than the supercharger requires so there is pressure now between the turbos and the supercharger which enables the supercharger to compress it even further than just by itself - very similar to a compound turbo effect at peak power. Hope that makes sense - feel free to correct if I'm wrong.

It's giving me a headache trying to draw that out in my brain Only way I can imagine it, seems like the turbo would work against the supercharger.... But I did a quick search on it and it does seem to work. I would like to see that system drawn out. Would that set-up be more benneficial than supercharger feeding the turbos?

Right now I'm looking at buying a big truck turbo....for future use

[roary]

Just curious, but what are you planning on putting the "big truck turbo" on? And are you meaning a Semi truck turbo?

[rammertide07]

Originally Posted by roary

Just curious, but what are you planning on putting the "big truck turbo" on? And are you meaning a Semi truck turbo?

My truck.... and yes, it came off a semi or a heavy equipment diesel. I seen someone that took one off a cummins semi and fabricated the setup. They moved the passenger side battery tray (relocated the battery) and set-up the turbo there. Not sure how they plumbed it, but it worked with the stock/aftermarket turbo that was already on it.

[907DAVE]

Here is a pic of mine.

[TwinTurbo]

Originally Posted by 907DAVE

They can be set up either way.

Empire Diesel has turned out a few rigs that have a ProCharger feeding a turbo.

I post more on this later.

Thanks Dave always nice to learn something new, I guess its all in how you size them huh?

[TwinTurbo]

Originally Posted by rammertide07

It's giving me a headache trying to draw that out in my brain Only way I can imagine it, seems like the turbo would work against the supercharger.... But I did a quick search on it and it does seem to work. I would like to see that system drawn out. Would that set-up be more benneficial than supercharger feeding the turbos?

Here's the type I was thinking of 1102Dp The Chevy Silverado Blowermax Engine Shot Photo 4

[907DAVE]

I have a few concerns with centrifugal superchargers(ProCharger or PC). First off they are RPM dependent....so max boost is achieved at max RPM. Does not sound too bad until you think about how it will affect drive-ability.

Imagine you are pulling a trailer around town and reach a hill, as you ease into the throttle your turbo will react to the higher EGT's and boost will climb, and you have the power to climb the hill. Now take a truck that is supercharged (centrifugal) - pulling the same hill - as you ease into it, boost does not change....until you push down so hard it downshifts and your engine is revved high enough to make some boost.

Does not make sense to be driving around all day in low gear just so you have a bit of power, does it?

Another company is producing kits that add a supercharger as a primary stage in a compounded setup. The problem I have with this is low RPM boost is still up to the turbo to produce.....not the instant boost some are claiming from them. The logical cure for this would be to use the supercharger as the secondary stage in compounds, and try to massage the ratios to have boost pick up off idle, then have he turbo take over when its ready - but apparently the ProCharger cannot handle the heat of being force-fed by a turbo.

Another problem I see is the inability to turn the PC off.....its always on - always robbing HP's even when you dont need it.

I believe the ultimate setup would be to have a Whipple or TwinScrew style charger as the secondary and have it fed by a large turbo(s), like the BlowerMax.

The Whipple chargers are great because of there ability to boost hard down low, and bypass when not needed. Combine that with the top end potential of a big turbo and you will have a pretty fun setup.

But in all reality, a set of properly matched turbos can do the same task.

[rammertide07]

Looks like I need to do some more research lol. I think do a boost compressor set-up would be cheap and easy to test. I gotta try at least.

Who did your turbo plumbing and fabrication? It's pretty sweet. I wouldn't know where to begin. What kinda boost are u making?