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Discussion Starter · #1 ·
Hello, I am new to cars in general and was wondering why there is a max injector size you can use with an FMU. For example, what would be the problem with running 1000cc injectors with a stock ECU and just an FMU? I am not planning on running 1000cc injectors but I want to know the reason why there is a limit to how high you can go with a stock tune and an FMU. The injector size I would like to run is 650cc. The FMU is just a temporary thing until I learn how to install megasquirt. Thanks.
 

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Its because you can only tune out the traits of larger injectors to a certain point without actually re-writing the ecu code, the fmu is a band aid at best and not a very good one at that.
 

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Discussion Starter · #3 ·
Its because you can only tune out the traits of larger injectors to a certain point without actually re-writing the ecu code, the fmu is a band aid at best and not a very good one at that.
So what is the maximum size injector I can run?
 

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Why do you want to run a larger injector on a stock non-turbo motor?

You're going about the upgrade path wrong.
 

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Discussion Starter · #5 ·
My plan is to turbo it first at around 8 psi then upgrade the engine internals to handle more boost. The injectors will be one of the later parts but this process will happen fairly quickly because I have a decent amount of money saved up.
 

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Get the tuning device installed and a wideband, then worry about the other stuff.
 

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Discussion Starter · #7 ·
Get the tuning device installed and a wideband, then worry about the other stuff.
The problem is finding an available megasquirt unit. The places I have looked so far seem to be out of stock. I was thinking about running 8 injectors and an AIC. The process seems to be fairly straight forward and there are plenty of controllers available.
 

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Elite DSMtalker
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Did you try going directly to diy autotune?
 
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