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Too much turbo lag

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hey, I’ve recently had my vehicle tuned but it seems to have a lot more lag than it should

Can anyone advise what could cause this and where to start

thanks.

Need way more details. Engine, mods, history of the project, who tuned it.

There's a heap of factors that will affect the lag from a particular combination. While it can be influenced by the tune, predominantly the boost response is more related to the sizing of the turbo and engine. Let's start however by asking is this a completely new combination that's been tuned and running for the first time? Or has the lag seemingly developed since your tune?