Any body had any problems with boost! ..I have an 03 vRS hatchback n everytime I take my revs to 5000 + my car afterwards will only boost to 0.4 I have to quickly turn ignition off n on again then my boost is back to normal (1.4psi) no engine management light is coming on.. Could this be a problem with my n75 boost valve??? Help please :-)

Diagnostics needed. It's going in to limp so you should have a code logged, BTW not all codes cause the EML to come on.

Could be the sticking VNT.

Could be the sticking VNT.

Not on a petrol

0.4 and 1.4 psi, that nothing they should boost to around 10psi,

If you mean its boosting to 1.4 bar thats around 20psi, even mapped thats alot of boost

I fear the dreaded 17705 code could be on the horizon.

It was the solenoid in the n75 valve! No engine management faults stored! ...since I've had several engine mods my octavia boosts now upto 2+ bar ha I've had revo remap stage 2 decat 4.0 bar fuel reg so on... And it's okay not over Boosting at all no faults

2 bar lol think you either have a dodgy boost gauge or you have a big issue !!