Re: What psi do i set the pressure switch on a 2d?
EGTs are not a good indicator for W.I.
In fact they are not affected as much as one might expect.
There are no hard-and-fast rules on the activating pressure, because it depends how far you've exceeded the manufacturer's safety margins.
A good start is just before the max point that the manufacturer expected the car to operate.
So if the stock setup used to go up to 11psi, and now it's boosting up to 20psi then activating the WI at 10psi is a good starting point. Better intercooling can help shift the point upwards, just like low ambient temperatures (below 10C for example)
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