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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
The difference between the standard -18 (on a Cossie anyway) and a -31 is that the -31 has a stronger spring, which holds the wastegate shut longer, reducing the time it takes the turbo to spool up
It does not affect spool up at all, it merely holds the wastegate shut against MORE pressure so it can provide more, but the spool is not affected as pumping remains the same.
tabetha