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Thread: Turbo for each individual cylinder - Why don't more people do this?

              
  1. #1
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    Turbo for each individual cylinder - Why don't more people do this?

    I've wondered about this and this is the first time I've seen it done. Imagine tiny turbos right up to the motor like this. Is it just too complex? Why don't more people do this?

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    Pretty cool idea. Probably not done as I'm sure it's expensive (4, 6 or 8 turbos to be bought). Space would likely be an issue, and I'm sure it will get pretty hot. Properly sizing the turbo would probably take a good bit of trial and error, too.

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    Click here to enlarge Originally Posted by GetSomeE92 Click here to enlarge
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    Pretty cool idea. Probably not done as I'm sure it's expensive (4, 6 or 8 turbos to be bought). Space would likely be an issue, and I'm sure it will get pretty hot. Properly sizing the turbo would probably take a good bit of trial and error, too.
    It just looks so cool.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
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    It just looks so cool.
    It does look pretty bad ass. I bet it sounds like a freaking jet, too.

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    Click here to enlarge Originally Posted by Snertz Click here to enlarge
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    That looks insane.

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    Cool idea

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    Uh, regulating an even pressure in each cylinder and individual cylinder fuel control/injection could be one reason why this isn't main stream. I don't see how this could really be a huge benefit.
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
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    Uh, regulating an even pressure in each cylinder and individual cylinder fuel control/injection could be one reason why this isn't main stream. I don't see how this could really be a huge benefit.
    It's a benefit to looking like a badass.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
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    It's a benefit to looking like a badass.
    lol
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    I think heat and space will be an issue. I also think tuning would be a pain.

    I would how lag would be on a setup like that? I know smaller turbos reduce turbo lag, so maybe using a small turbo on each cylinder would nearly eliminate lag.
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    There would absolutely no lag. Since each cylinder is going to hit it's exhaust stroke at different times, each turbo will spool almost sequentially. I could see this I4 producing insane amounts of power and immediate TQ/response. I would have to imagine this does exist on some type of racecar.
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    I'm sure this has its benefits... But I couldn't see it being used in any kind of daily driver or anything that requires long term reliability. Variances between turbos would also be an element that would cause headaches.
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    There is going to be a problem with doing this. The turbines will not see a collective train of gas pulses.

    Pulses that overlap are bad, not enough pulses is also, well kinda bad. The turbos are small so they will spool up fast, but think about it, a 4 stroke engine will only produce one exhaust pulse for every two engine rotations. If one turbo gets that one pulse, then it will in theory spool up twice as slow as the same turbo that gets two pulses in two rotations assuming the rotational inertia of the turbochargers are the same. I have seen people do this before with success, but there is a law of diminishing returns, I think in this case.


    Obviously a big V8 with Y connectors everywhere and having all 8 cylinders dump into one turbo is a cluster$#@! fluid dynamically and results in lots of exhaust backpressure. So, a good way to describe it is, there is a minimum number of cylinder pulses required to get the most effective spool up time, the more cylinders you add the more careful you have to be with separating the exhaust pulses and having them join up without overlap (think equal length primaries and split housing exhaust scrolls)...
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
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    There is going to be a problem with doing this. The turbines will not see a collective train of gas pulses.

    Pulses that overlap are bad, not enough pulses is also, well kinda bad. The turbos are small so they will spool up fast, but think about it, a 4 stroke engine will only produce one exhaust pulse for every two engine rotations. If one turbo gets that one pulse, then it will in theory spool up twice as slow as the same turbo that gets two pulses in two rotations assuming the rotational inertia of the turbochargers are the same. I have seen people do this before with success, but there is a law of diminishing returns, I think in this case.


    Obviously a big V8 with Y connectors everywhere and having all 8 cylinders dump into one turbo is a cluster$#@! fluid dynamically and results in lots of exhaust backpressure. So, a good way to describe it is, there is a minimum number of cylinder pulses required to get the most effective spool up time, the more cylinders you add the more careful you have to be with separating the exhaust pulses and having them join up without overlap (think equal length primaries and split housing exhaust scrolls)...
    But it looks amazing Click here to enlarge

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    That sure does look cool. I've always been curious if somebody had done such a thing.

    As DBFIU covered, it's probably beyond the point of diminishing returns and even going into reduced returns. Then there is all the additional cost, complexity/reliability, heat, tuning problems, etc.

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
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    There is going to be a problem with doing this. The turbines will not see a collective train of gas pulses.

    Pulses that overlap are bad, not enough pulses is also, well kinda bad. The turbos are small so they will spool up fast, but think about it, a 4 stroke engine will only produce one exhaust pulse for every two engine rotations. If one turbo gets that one pulse, then it will in theory spool up twice as slow as the same turbo that gets two pulses in two rotations assuming the rotational inertia of the turbochargers are the same. I have seen people do this before with success, but there is a law of diminishing returns, I think in this case.


    Obviously a big V8 with Y connectors everywhere and having all 8 cylinders dump into one turbo is a cluster$#@! fluid dynamically and results in lots of exhaust backpressure. So, a good way to describe it is, there is a minimum number of cylinder pulses required to get the most effective spool up time, the more cylinders you add the more careful you have to be with separating the exhaust pulses and having them join up without overlap (think equal length primaries and split housing exhaust scrolls)...
    Now this is a sound explanation that makes total sense. This is why the BMW S63 turbo setup is much more efficient than the N63 thanks to dual exhaust pulses. I didn't think about it.

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    Click here to enlarge Originally Posted by Snertz Click here to enlarge
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    Blowing down through a carburetor, talk about old school technology and a waste of time.. Haha. Looks cool, but you could get better spool and more power with properly sized twins and fuel injection.
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