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    1 out of 1 members liked this post. Yes Reputation No

    N20 turbo upgrade?

    has anybody thought about changing the mitsubishi turbo on this engine yet? with the stock one running over 17psi from bmw the ecu tunes out there are only going to be worth so much. a turbo with higher cfm would be ideal since the piggy back systems seem to be able to trick the ecu into dumping fuel when needed.

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    Of course people want to upgrade the turbo on the N20.

    It's early on we are barely even getting tunes out there. It is going to come faster than the N54 but even that motor after being out for 7 years is just starting to see good turbo upgrade results.

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    I'm sure people are already looking into this, but since it is a fairly new platform...doubt we will see something concrete until next year.

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    I think an N55 needs one way more than this...

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    It doesn't seem like it would be that hard to source a turbo with the same turbine housing because bmw's twin scroll design is really just cyls 1/4 and 2/3 powering a different part of the turbine wheel at different speeds to avoid the need for an equal length manifold while taking advantage of some higher speed areas. The injectors are the same as the n55 but that engine uses 6 so with the posted bmw hp/tq#'s, the n20's injectors are more heavily taxed but they are at most a $450 set.

    At stock 17.5psi at 5500 rpm the turbo would produce 383cfm, lets say the tuners are getting 25psi out of this turbo and it stays effecient it might produce 472cfm.

    At this point I'd probably even sacrifice the spool time by just changing the compressor wheel (and possibly) the compressor housing because bmw hasn't done anything special there to have something that pushes the same 472 cfm that has already been tested but at a lower psi. The question then becomes at what point does something on the engine actually break because the components are fine

    btw, with these slightly random #'s, you are looking at 247hp stock and 304hp tuned so they're a bit off but I also have no idea what psi everyone is using or if the turbo can even push 25psi.

    "But unlike its six-cylinder counterparts, the entire block is mast in aluminum; there are no cylinder liners inserted at all. Instead, the swept area of the combustion chambers is treated with a thin layer of iron by way of electric arc spraying technology. BMW took a lesson from AMG, who first used this process on its own turbocharged engines. This method of literally spraying hot iron onto the aluminum cylinder walls not only reduces weight, it allows for cooling passages in the narrow regions between the cylinder, a critical consideration for durability and reliability on a highly-stressed turbo engine."

    the above quote did not mean the n54/n55, they are both aluminum as well. "The N55 shares its all-aluminum block, direct injection system and 10.2:1 compression ration with the N54"

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    Click here to enlarge Originally Posted by brian99997 Click here to enlarge
    It doesn't seem like it would be that hard to source a turbo with the same turbine housing because bmw's twin scroll design is really just cyls 1/4 and 2/3 powering a different part of the turbine wheel at different speeds to avoid the need for an equal length manifold while taking advantage of some higher speed areas. The injectors are the same as the n55 but that engine uses 6 so with the posted bmw hp/tq#'s, the n20's injectors are more heavily taxed but they are at most a $450 set.

    At stock 17.5psi at 5500 rpm the turbo would produce 383cfm, lets say the tuners are getting 25psi out of this turbo and it stays effecient it might produce 472cfm.

    At this point I'd probably even sacrifice the spool time by just changing the compressor wheel (and possibly) the compressor housing because bmw hasn't done anything special there to have something that pushes the same 472 cfm that has already been tested but at a lower psi. The question then becomes at what point does something on the engine actually break because the components are fine

    btw, with these slightly random #'s, you are looking at 247hp stock and 304hp tuned so they're a bit off but I also have no idea what psi everyone is using or if the turbo can even push 25psi.

    "But unlike its six-cylinder counterparts, the entire block is mast in aluminum; there are no cylinder liners inserted at all. Instead, the swept area of the combustion chambers is treated with a thin layer of iron by way of electric arc spraying technology. BMW took a lesson from AMG, who first used this process on its own turbocharged engines. This method of literally spraying hot iron onto the aluminum cylinder walls not only reduces weight, it allows for cooling passages in the narrow regions between the cylinder, a critical consideration for durability and reliability on a highly-stressed turbo engine."

    the above quote did not mean the n54/n55, they are both aluminum as well. "The N55 shares its all-aluminum block, direct injection system and 10.2:1 compression ration with the N54"
    Very good post here.

    It isn't going to be hard to upgrade the wheel in the stock housing but trying to change the turbo is where it gets complicated. I think is is more tuning than hardware as always with BMW's. We will see turbo upgrades but nobody is doing it yet.

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