I've been given this for free.

[Field Marshal Dr. Opti]

A few years old and taken off a BMW M340i ( before being sold) with the same B58 lump as my car. About £230 new and anywhere from £50-£150 used on ebay.

Very simple to intall ( about 2 minutes) and works on the MAP sensor only. Very safe, I'm told.

Anyone have experience of this type of thing?

[TheBoy]

If it only plugs into MAP, I assume it fools the ECU into thinking the boost is lower than it is, and allowing more boost from the turbos....

Bit of a bodge IMHO, potentially harmful to car....

[STEMO]

And totally unnecessary

[Sir Tigger KC]

I had something like that on my old 530d which pulled and sounded like a Deltic locomotive! 

I never tinkered with it so I don't know if it made any difference. 

[Field Marshal Dr. Opti]

If it only plugs into MAP, I assume it fools the ECU into thinking the boost is lower than it is, and allowing more boost from the turbos....

Bit of a bodge IMHO, potentially harmful to car....

Exactly. It has a switch inside that can add  up to an extra 4.5PSI of boost.

It's a pretty mild device so very unlikely to harm the engine. Most cars come with restricted boost from the factory these days. I believe the 3 pot 1000 cc Fiesta engine is available with 3 different power outputs, obtained  by playing with the boost pressure.   

[Field Marshal Dr. Opti]

I had something like that on my old 530d which pulled and sounded like a Deltic locomotive! 

I never tinkered with it so I don't know if it made any difference. 

Yes...I remember you saying that

Turbo derv motors respond well to a bit of boost tweaking.

[Raeturbo]

Boost boost and boost some more and be merry😁🔥

[Field Marshal Dr. Opti]

Boost boost and boost some more and be merry😁🔥

I imagine your Evo is bursting with boost.....

[Raeturbo]

It has burst a couple of times in the past but I'm running a nice safe 1.8 bar at the moment 🤣

[Field Marshal Dr. Opti]

It has burst a couple of times in the past but I'm running a nice safe 1.8 bar at the moment 🤣

How much is this in old money?

[YZ250]

Just be aware that BMW's store boost data, amongst many other things. Bear in mind that all of the stored data is available to show if the vehicle has been working outside of its parameters, even during a normal service.
Being so new, I'd hate for you to void your warranty. 

[dave the builder]

It has burst a couple of times in the past but I'm running a nice safe 1.8 bar at the moment 🤣

How much is this in old money?

26 PSI

My Omegas GM branded tyre inflator is in BAR not PSI   
so I drag out the 2HP compressor because u can never remember how many BARs i need per tyre 

[VXL V6]

Just be aware that BMW's store boost data, amongst many other things. Bear in mind that all of the stored data is available to show if the vehicle has been working outside of its parameters, even during a normal service.
Being so new, I'd hate for you to void your warranty. 

^ This.  Any modification including rolling road sessions are recorded.

[TheBoy]

Just be aware that BMW's store boost data, amongst many other things. Bear in mind that all of the stored data is available to show if the vehicle has been working outside of its parameters, even during a normal service.
Being so new, I'd hate for you to void your warranty. 

the map would be storing the false value though.  that said, as it will impact other stuff, it would be noticeable if anyone looked hard enough...

[Field Marshal Dr. Opti]

Just be aware that BMW's store boost data, amongst many other things. Bear in mind that all of the stored data is available to show if the vehicle has been working outside of its parameters, even during a normal service.
Being so new, I'd hate for you to void your warranty. 

Agreed.

I imagine that even if the device is removed prior to a service there is 'stored data' available to BMW if the 'data police' from 1984 want to dig deep enough. Although, I doubt there would be a problem with the warranty if the warranty claim was related to the central locking or electric seats not working properly.......or anything unrelated to boost pressure.

It's a pretty quick car as it is ( sub 4 seconds to 60 MPH) according to Dragy so I'll probably keep my powder dry for now.