WR-MIKE

Does the waste gate on a turbo only open after the turbo reached maximum boost ?
cheers. Mike.

P20SPD

iTrader: (1)

No. IIRC it can begin to open lower than full boost.

WR-MIKE

the reason I am asking is I have a full decat exaust fitted and it's mot time so I will have to put the std exaust back on. problem is the APS SR40 turbo I have fitted does not have a combined apperture for the wastegate and the exaust so by fitting the std exaust I am blanking off the wastegate.
I will be taking it very steady to the MOT garage (under 2500 rpm) but I want to make sure that I do no damage on the way.

P20SPD

iTrader: (1)

Bit extreme. Will the standard centre section not go on. Most go through MOT with just this on.

WR-MIKE

No the std section is 2.5" my system is 3".
Mike.