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Discussion Starter #1
I've noticed that the boost varies in different gears, at least for me.

1) Does anyone know if this is something that is set up by the ECU ?

2) If this is a function of the ECU, how does it get it's data to know what gear is selected ?


Any info would be appreciated.
 

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There is less of a load on the engine at lower gears so you have less exhaust to spool the turbo, thats why you have less boost.


Now say you are in 3rd gear at 2K rpm then step on the gas, you will get a large boost spike because your putting a strong load on the engine because its at to low of an RPM which causes more fuel to burn which gives you more exhaust to spool the turbo.


Now once you pass 4k rpm, the boost will start to drop down to 13psi (if your boosting above that) because the turbos turbine is small in size and runs out of breath or its efficiency level.


Happy boostin.
 

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Discussion Starter #4
Makes sense, but I'm not sure that is the only thing that is creating the higher boost levels. I'll have to watch more closely when shifting into 3rd to see what the rpm's drop to. It seems that the rpm drop between 2nd and 3rd (when shifting close to red line) is not that far.
 
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