[330d4life]

Hi all,
Long time viewer of the forum, first time posting as I cannot find the answer anywhere.
Hoping someone can help me confirm.
I own a May-21 registered G21 330d
Bought it as a long term family do anything fun car, with the intention of getting it remapped and potentially turbo upgraded by Darkside developments.
I had my first proper poke around under the bonnet at the weekend and noted it has 2 turbos?
I specifically chose the 330d non xdrive for the simpler turbo/drivetrain setup for a “hopefully” lower cost of ownership over the long term. I plan to keep the car indefinitely and maintain it myself.

Having searched around the internet, I cannot find the 282bhp B57D30O0 referenced.
So my question is, did the later 330d’s with MHEV get the m340d engine in a detuned state?
Appreciate anyone who can shed light on this.
As noted, I’m pleased I managed to bag one of the last RWD 330d’s sold into the UK market.
Thanks

[G30M]

how do you know it has 2 turbos?

[330d4life]

Im pretty certain I can see the 2 compressor housings?
I compared the setup to the Garrett Tech article on the twin turbo setup and it matched. Also cross referenced the top(sml) turbo part no.

https://www.bmwblog.com/2020/05/27/b...diesel-engine/

This article cites the 210 kW / 286 PS (282 hp) and 250 kW / 340 PS (335 hp).

Assuming this is the engine in my car, are there any mechanical differences or is if just mapping?

Il post photos of my engine tomorrow

[330Stevie]

I thought the 330d lump was single twin scroll turbo. Im not 100% sure on the M340d, I think it may be bi-turbo (one small/one large) possibly, but will still be a variant on the 57D30 lump

[Rhino at Work]

From the wiki B57 page showing 330d as single and M340d as twin turbo

[Charlisdad]

I have an M340D and my engine is designated twinpower not twin turbo. The difference I believe is twinpower is a single turbo but with two intakes?

[xenon]

Yes it's a single, dual-scroll turbo. I thought they all were, tbh

[330d4life]

Thanks for the feedback,
Il get some photos shortly and post those.
It certainly looks like a compound”twin” turbo setup.
I’m pretty certain the m340d is twin turbo

[xenon]

Originally Posted by 330d4life

I’m pretty certain the m340d is twin turbo

Yes it is, I meant all the turbos (whether there is one or two) are all twin-scroll.

[330d4life]

Top sml turbo is clearly visible, bottom larger turbo; difficult to get good photos of.
A comparison set of photos of a m340d engine bay would be ideal if any can support

[HighlandPete]

Originally Posted by 330d4life

Top sml turbo is clearly visible, bottom larger turbo; difficult to get good photos of.
A comparison set of photos of a m340d engine bay would be ideal if any can support

My understanding from BMW technical data, current 320d, 330d & M340d engines all have multi-stage (two-stage) turbos. In the small and large turbo setup, is where the differences are.

320d and 330d, only one of the turbos is of the variable inlet design, the low pressure turbo. The M34d has both turbos of the variable inlet design.

Looking at the OE parts system it does look like the turbo is in two parts, a smaller unit attached to the manifold and a larger one separate which bolt together maybe this is just what they describe as "twin scroll"

You can see in this image

and another ( all done for G20/G21 M350d)

[HighlandPete]

Originally Posted by stuarttunstall

Looking at the OE parts system it does look like the turbo is in two parts, a smaller unit attached to the manifold and a larger one separate which bolt together maybe this is just what they describe as "twin scroll"

Twin-scroll is the design of the single turbo in the petrol engines.

Diesels are two stage, (high and low pressure), often refered to as sequential turbos.

Sometimes we get confused by BMW's use of "Twin Power Turbo".

[HighlandPete]

This image illustrates the Twin-Scroll principle, (N55 in this case). The use of two separate exhaust inlet tracts, one to each of the "scrolls" on the exhaust turbine.

[330d4life]

Originally Posted by stuarttunstall

and another ( all done for G20/G21 M350d)

Hi Stuart,
Can you cross reference the turbo part numbers please.
I googled the part no. On my small turbo and it returned a bmw per no. for a 340hp turbo setup.
Suggesting the sml turbo is compatible, but I’ve got too assume the larger unit?
Other than this, are there any other potential hardware changes BMW make to send the engine out with another 58bhp from factory?

[330d4life]

Originally Posted by HighlandPete

My understanding from BMW technical data, current 320d, 330d & M340d engines all have multi-stage (two-stage) turbos. In the small and large turbo setup, is where the differences are.

320d and 330d, only one of the turbos is of the variable inlet design, the low pressure turbo. The M34d has both turbos of the variable inlet design.

Hi Pete, was the pre MHEV g20/21 330d also a sequential setup or was it a true single setup, as it was the same carried over from the later 265hp unit fitted in the F series.

[HighlandPete]

Originally Posted by 330d4life

Hi Pete, was the pre MHEV g20/21 330d also a sequential setup or was it a true single setup, as it was the same carried over from the later 265hp unit fitted in the F series.

From the technical data for the pre MHEV, was the single turbo with variable inlet geometry. RealOEM supports that as well, illustrating the single turbo.

[G30M]

interesting how BMW even lies about how many turbos!

[G30M]

Originally Posted by stuarttunstall

Looking at the OE parts system it does look like the turbo is in two parts, a smaller unit attached to the manifold and a larger one separate which bolt together maybe this is just what they describe as "twin scroll"

that is definitely not twin scroll

it's two turbos

[HighlandPete]

Originally Posted by g21

interesting how BMW even lies about how many turbos!

Where are they doing that?