has anyone seen a compound turbo set up in the dunes?

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John@Outfront

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just curious if anyone has seen one or know of any successful reports of someone running one. I am usually a "KISS" kind of guy but i do have some interest in a custom project
 
Never seen or even heard of one. If it worked there would be plenty out there already. With these new cars making 30psi why compound them? The LS style block can only handle so much pressure.
 
I doubt if John is worried about LS blocks! I hope you do it John. I am always glad to see people breaking the usual ol' mold. (Lack of money holds me back).
 
Compound turbos can be incredible to make instant low end boost. And are more efficient in that they can broaden the power curve. Basically n the application I’m thinking is a GTR v6. There would be the basic two turbos hanging off the exhaust manifolds. The tail pipes of these two turbos hanging off then get tied together and go through a single larger turbos exhaust housing. This larger turbo compressor side then feeds the inlet of each smaller turbos cold side inlet. If the big turbo produces 15 psi to the two smaller turbos. And the smaller turbos also run at 15 psi the result is that the smaller turbos act like they are only making 15 psi but in reality are now capable of putting out twice their rated hp! So a smaller turbo rated at 300 hp turbo could net 600 hp (per turbo). The small turbo would spool instantly because they are extra small in comparison to the engines cc's. Once those primary waste gates open then all the exhaust from the two primary turbos including the wastegate exhaust is pumped through the big turbos hot side. Yes. This idea would then have three turbos on one 3.8 liter engine. 1200 hp and all three turbos are only thinking they are doing 15 psi and instant boost. I think my country coach 525 cat motor has compound turbos factory. It does 1650 ft lbs at 1300 rpm

compounding turbos on a rear engine v8 would be pretty busy, but to have three turbos on a mid engine v6 with one huge turbo out the back would be awesome (looking and sounding) peace!
 
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I haven’t seen any in the dunes, I feel like there maybe was an old Mazda rotor compound turbo way back sand drags
Boating world it’s done, on big cube motors, but usually compound with blower and twin turbos like Alexi ( former boostpower) quad rotors also.
There’s a guy ChrisV on RDP that all he does is GTR’s I’m sure if anything can or has been done he will know all the in’s and outs to it, he’s to gtrs as you are to subi’s
 
I’ve seen them on the same drag utv guys cars, I think it was in a can am and the guy said they run upwards of 60psi on it… it’s one of those 300’ cars though.
 
Biggest issue isn’t getting response, it’s getting enough exhaust flow for higher power. Need a huge wastegate to get the small turbo to not be a restriction
 
Rockwood said:
Biggest issue isn’t getting response, it’s getting enough exhaust flow for higher power. Need a huge wastegate to get the small turbo to not be a restriction
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i imagine a compound gas vehicle would produce really high cylinder head temps if the heads arent tuned on a flow bench
 
Sausage450r said:
i imagine a compound gas vehicle would produce really high cylinder head temps if the heads arent tuned on a flow bench
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Supras had them, most ditched it for a single setup, but that’s because you could make stupid power back then…
 
L.R.S. said:
Never seen or even heard of one. If it worked there would be plenty out there already. With these new cars making 30psi why compound them? The LS style block can only handle so much pressure.
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This is the same mentality most folks had when Andrew Buck put big shocks and LS motors in bigger frames in the late 90's.

And now, you make a pretty damn good living off of the results of his oddball thinking. Weird how that works.
 
Rockwood said:
Sick. All teh STU STU STU STUs

But I don't think that's a good dune setup :)
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Sounds like the biggest issue they have with it is the head.
For the average to above average not joe blow do it myself tinkerer; why not just run a supercharger?
My neighbor has a corvette he races.
He recently supercharged it all under the hood. Its basically looks like a belt drive turbo (texas speed)
 
Sausage450r said:
Sounds like the biggest issue they have with it is the head.
For the average to above average not joe blow do it myself tinkerer; why not just run a supercharger?
My neighbor has a corvette he races.
He recently supercharged it all under the hood. Its basically looks like a belt drive turbo (texas speed)
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super charger are not as efficient as a turbo and from what i see, compound turbos are even more efficient than just one turbo making the same boost. . i think it would be cool. i think the bottom end could be just as good if not even better than a super charger. besides being less efficient they are also heavy and top heavy at that
 
John@Outfront said:
super charger are not as efficient as a turbo and from what i see, compound turbos are even more efficient than just one turbo making the same boost. . i think it would be cool. i think the bottom end could be just as good if not even better than a super charger. besides being less efficient they are also heavy and top heavy at that
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What type of motor are you thinking? I would think a inline or flat 6 or 12 cylinder would be best to try it with.
 
Sausage450r said:
What type of motor are you thinking? I would think a inline or flat 6 or 12 cylinder would be best to try it with.
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Nissan GTR twin turbo V6 VR38TT. This motor is rated stock HP at 545. these motors can make 1000 hp in stock form. With mild upgrades are in the 12-1500 hp range. T1 even makes a 4.1 liter stroker motor, billet block (costing $70k) and is in every fastest R35 car in the world
 
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