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my friend says hes gonna hook up a turbo and a supercharger. i think he says hes gonna run the turbo through the supercharger. is this possible, because it sounded like bullshit to me.
is this possible ?
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It can and has been done, at least one rally car has used such a setup in recent times. I've seen it on street cars before as well. Usually done with a fairly low displacement supercharger to enhance low end torque, with the turbos coming up in the midrange and top end. The turbos provide the air inlet to the supercharger so theres no chance of wasting turbo boost pressure. I hope he has very strong engine internals, such a setup can exceed 30-40 psi. Depends on the turbo boost settings and the supercharger pulley size, of course.hondakillerZX said:
And really, with turbo and supercharger internal designs such as they are these days, doublecharging is not necessary. Either system alone will make for a powerful streetable car. More than 10 years ago, when doublecharging was first attempted, turbos were more peaky and superchargers were more low end, so it made sense back then . Now, it doesn't.
Mistu did it back in the days...
they had a V6(least i recall it was) that was turboed then supercharged.. blower gave 6 psi.. turbo gave 10 psi... combined.. the engine received around 60psi of boost... amazing performances were acheived with thsi setup.. unfortunately.. the finely crafted internals simply could not function under these stresses and would fail after only a couple of runs.. it was meant for rallying.. and although it simply blew everything out of the water.. it also blew everything out of the engine compartment as well.. too often.. too far from the finish line to coast past it... keep in mind.. had they pushed their car past the finish line.. they had enough of a lead in most cases to actually win... but with reliability problems (never thaught id say that about japanese engines) that plagued this system.. its hardly something one of us mere mortals could juggle with daily... heck.. not even on the weekends...
... so great.. you pull 3 car lenghts on ANYTHING that pulls up besides you at a light... too bad your walking before you get to 2nd gear hehehe
they had a V6(least i recall it was) that was turboed then supercharged.. blower gave 6 psi.. turbo gave 10 psi... combined.. the engine received around 60psi of boost... amazing performances were acheived with thsi setup.. unfortunately.. the finely crafted internals simply could not function under these stresses and would fail after only a couple of runs.. it was meant for rallying.. and although it simply blew everything out of the water.. it also blew everything out of the engine compartment as well.. too often.. too far from the finish line to coast past it... keep in mind.. had they pushed their car past the finish line.. they had enough of a lead in most cases to actually win... but with reliability problems (never thaught id say that about japanese engines) that plagued this system.. its hardly something one of us mere mortals could juggle with daily... heck.. not even on the weekends...
... so great.. you pull 3 car lenghts on ANYTHING that pulls up besides you at a light... too bad your walking before you get to 2nd gear hehehe
i think if you run a super/turbo or any compressor in series the second turbo will compress the air above what the first one has.
http://www.hotrod.com/techarticles/engine/113_0312_turbo/index2.html
http://www.hotrod.com/techarticles/engine/113_0312_turbo/index2.html
that backs me up though.. the part about coumpounding the boost.. multiplying it fomr the first to the 2nd turbo...James said:
i guess i should have mentionned in my post.. that the blower ALONE would have given 6psi.. and the turbo ALONE would have given 10psi.. the way i wrote it seemd out of wack when i read it again hehe my bad.. but the final 60psi boost .. that i remember
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There are people running around 60 pounds of boost in costa rica or puerto rico (I don't remember), but the engine lasts 2 or 3 quarter mile passes...
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I gotta wonder what kind of intercooling is used to handle the heating of the intake charge in a turbo + super set up. Also, why would you want to boost in such a convoluted way, when larger displacement would get the job done better?
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Ideally in a staged compression setup (in this case, 2 stages: turbo first, blower second), each stage has identical pressure ratios and an intercooler after each stage. This will maximize efficiency. Well, maybe not quite as the turbo and blower will have different efficiencies but thats the general theory.
Super turbo charging was implemented to bypass the problem of turbo lag before the invent of ball bearing CHRA turbos. There were a few dual charge cars released in the marketplace - Nissan Micra Super Turbo being one of them. I believe it ran some kind of sophisticated switching system rather than a compound system.
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