"Cherry_man1" (Cherry_man1)
05/10/2015 at 16:26 • Filed to: Random thought
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"Cherry_man1" (Cherry_man1)
05/10/2015 at 16:26 • Filed to: Random thought | 0
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Could you devise a way to make a car have 4 turbos but have an eco mode where you could only spool up one out of the 4 but when you want all the performance you could open a valve and then all 4 could spool up?
Jordan and the Slowrunner, Boomer Intensifies
> Cherry_man1
05/10/2015 at 16:41 |
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Possible, but not likely, because you probably have to have a second injection system to compensate for the lack or excess fuel.
Twingo Tamer - About to descend into project car hell.
> Cherry_man1
05/10/2015 at 16:46 |
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You could but I doubt it’d improve economy particularly. Most boosted cars you can save fuel by staying off boost when possible. It’d also be massively complex.
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Cherry_man1
> Jordan and the Slowrunner, Boomer Intensifies
05/10/2015 at 16:47 |
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I didn't think about that but you think it could be done though? I mean with turbo tech right now it could be done
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Jordan and the Slowrunner, Boomer Intensifies
> Cherry_man1
05/10/2015 at 16:48 |
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Anything is possible with the right amount of cash.
ranwhenparked
> Cherry_man1
05/10/2015 at 16:49 |
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It probably is possible, just very complicated. Automakers haven’t done it yet, because there hasn’t been a real need to pursue it, but I suppose it is conceivable that it will be tried eventually. They could call it the Turbo 4-3-2-1.
VincentMalamute-Kim
> Cherry_man1
05/10/2015 at 20:56 |
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It would basically be a parallel electrical circuit. Keeping it simple to an inline 4, you would have the exhaust manifold go down to one pipe, then divide into one pipe to run each turbo. Two intakes, one to each turbo, two pipes into the intake manifold. Butterfly valves to disconnect the exhaust and intake plumbing to one turbo. Double all that for V8’s for 4 total turbos, 2 of them getting switched in and out.
Neat idea. I’m thinking way too complex, space hogging for all the piping back and forth to the intercooler given how tight things are in engine bays, and not enough benefit.
I’m interested in Mad Max’s Interceptor that had the supercharger he could turn on and off. He could do that because it was a movie and the supercharger was a prop and wasn’t functional. But it would be neat to have a fan clutch that turn on and off the belt and a forced induction intake pathway that could be switched into and out of the naturally aspirated pathway when you needed to escape the motorcycle gang. That would be less plumbing and space I bet.
AMGtech - now with more recalls!
> VincentMalamute-Kim
05/11/2015 at 20:19 |
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Actually Mercedes does this with the OM651 diesel 4. One little turbo that can either boost directly into the engine (via charge coolers of course) or use its boost to spool the big turbo faster. Uses vacuum controlled valves to control where the boost goes or doesn't go depending on load requirements and such. It's very seamless and doesn't take up a ridiculous amount of space. You would never know it had two turbos just looking at it.
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AMGtech - now with more recalls!
> Cherry_man1
05/11/2015 at 20:20 |
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If you were to scale the Mercedes OM651 up to a V8 it would be exactly this. See my reply to VincentMalamute-Kim.
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VincentMalamute-Kim
> AMGtech - now with more recalls!
05/12/2015 at 00:05 |
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see? Cherry is being creative, not crazy. Thanks for that tidbit of info about the OM651, learned something. I was going to ask whether the exhaust manifold to the little turbo also get valves but thinking a bit, I would say no. It would only cause turbo lag to switch it on and off. And who cares if the little turbo is constantly running.
No, I wouldn’t think for an inline 4, 2 turbos with piping would be a problem. I was thinking for a V8 with 2 turbos for each bank and then extra piping to switch one in and out wouldn’t work. I’m thinking of my buddy’s A8 whose 4.2 V8 engine bay is tighter than .... uh, it’s very tight. And my S4’s two turbos for its V6 has an engine bay that’s ridiculously tight.
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AMGtech - now with more recalls!
> VincentMalamute-Kim
05/12/2015 at 11:19 |
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Definitely not crazy, and even if he was crazy ideas sometimes turn into the best ideas!
The exhaust manifold/turbo set up on the 651 really only takes up about as much space as the set up on the bi-turbo V8 and V12. That's why I think it would fit just fine as a V8. It's surprisingly small but makes a real nice amount of boost. I can't remember off the top of my head for certain if both turbos have valves but I think that they do. The reason being that the little turbo will actually limit air flow at higher revs, so once the big turbo is spooled there is no need for the little one and it would in fact have a negative effect. IIRC it's all set up in such a way that the turbos can either run in series or in parallel.
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VincentMalamute-Kim
> AMGtech - now with more recalls!
05/12/2015 at 19:07 |
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Mercedes engineers may be smarter than me. I’ll accept that.