External wastegate / A/f reading etc

[merlin2002]

Quick question?
If your running a external wastegate, will a wideband read lean when the wastegate vents to atmosphere?
Also if this is correct how do you tune a car with this situation?
Thanks
Rob

[BlitzBoy]

............No

[merlin2002]

OK loo! Wasn\'t sure..... Thought it may do never did on my civic turbo but thought I better check before I blow it up lol

[jackaleks]

if you\'re changing from a plumbed wastegate to a venting system you might want to get the map checked though...