I just bought a 2020 110 P400 - The other day on the highway doing about 110km/hr I accelerated to pass another vehicle and I heard a "whoosh" kind go sound coming from the rear.
Has anyone ever experienced this?

 

Enargy1 yes I hear the whoosh noise in my defender quite often. How it was explained to me was that when you press down on the gas peddle a mixture of air and fuel and sparks swirl around under your hood. That mixture of fuel and air and sparks then get expelled out two little round tubes at the back of your car. Sometimes that rapid expelling of mixture pressure makes a whoosh noise. In my case its more of a whoosh vroom whoosh but i bet its the same thing you are hearing.

 

Very Funny...

 

Well, there's not much at the back of the vehicle to make a sound like that.

l would be looking at the exhaust system for damage, maybe from off-road use by a previous owner.

Have you tried the vehicle again and did the noise occur as before?

 

it's the afterburners making those sounds after passing other vehicles.

 

That sudden spool-up sound from a Defender when activating the afterburner? We need soundtracks

 

Mine doesn't have afterburners. Another feature removed from MY23

l'll get on to the dealer and see if they can be retrofitted along with the locking fuel flap and USB ports.

 

the fuel flap is not lockable

 

Do you have the classic mudflaps? Check them to see if they are loose. Just go back there and shake them. If they are loose at the top, just tighten them. Heard those on someone else's Defender trying to find out what the maddening noise was. Was infrequent and hard to replicate. Usually when passing or being passed by a semi and the wind would shove laterally. Turned out to be loose mudflaps.

My MO when dealing with creaks, flaps and random noises is to press, push, pull and attempt to see if any exterior trim (including and starting with all the "Dealer Installed Mods") for loose bits. I'm not saying they didn't properly torque things (perhaps), but definitely things loosen up with vibrations.

Good luck.

 

The LR Tech who came to do my software update said mine was the first he'd seen where the fuel filler cap WASN'T lockable and he was "amazed" that it wasn't.
"l am going to check the next one that l see" he said