[Ramos]

Wait.. I thought the N54 also had valvetronic ? No?

[flem]

Originally Posted by Xander

sweet. This will make a turbo swap that much easier.

X...

+1

[cstavaru]

Originally Posted by Ramos

Wait.. I thought the N54 also had valvetronic ? No?

No. It has (double) VANOS, but not VALVETRONIC.

[dlbrooks18]

nice.. I have a feeling that HPF will be doing a single turbo conversion for the N54, we'll see

[BavarianBullet]

Originally Posted by kptaylor

What does this mean, "multi-hole valves"? Does this address the valve coking we're starting to see?

They mean multi-hole high pressure direct fuel injector tips, not the intake valves that only see airflow.

Interestingly this is how port fuel injectors started out- single pintle and seat and then multi-hole later on. Hmmm.

[BavarianBullet]

Originally Posted by TMR

This goes to show that a larger single turbo will fit

quote of the day. (good job Bubbles too!)

I've been saying on and off that it looks like we've got a bit of room next to the stock turbos on the N54 in the 335 despite what others have said (some of which have really wrenched on the car too).

I stuck my head down there on my 335XI and, if I had removed some of the crap like heat shields, coolant tank and whatnot, it looks like I could prob stuff a first between the outermost part of the turbo and the car's frame rail. That's a good 3-4".

It'll be interesting as we get more pictures etc of this setup how it fits in whatever application. BMW could do something odd with the cylinder head or just lean the engine over a few degrees if the single had a hard time fitting.

Anyone hear about what make/model turbo this is? Compressor map etc?

[akira42]

Yea, but hitting max torque @1.2k rpm on single snail is pretty impressive. usually it takes higher RPMs to achieve max torque with that kind of a setup.

Originally Posted by cstavaru

Shit...does this make my baby obsolete...?

In fact...I think its good news. I was expecting more, but I think the single turbo technology is used for cost reasons. Its true, Valvetronic helps countering the turbo-lag effect, thus letting them get away with single turbo design. But I am not sure that this can be perfectly done.
The power and torque has not changed, the consumption is 8.9l/100km as opposed to 9.1l/100km in 335i, the CO2 is 209g/km as opposed to 218 for 335i. Not much of an improvement. The 1200RPM max torque as opposed to 1300 is not enough to drool over it.

And I hope the BMW Performance Power Kit will only be available for N54

[scheherazade]

Originally Posted by akira42

Yea, but hitting max torque @1.2k rpm on single snail is pretty impressive. usually it takes higher RPMs to achieve max torque with that kind of a setup.

Actually, target boost @ 1200 rpm for a 3 liter engine isn't all that amazing.

The larger the displacement, the smaller the turbo it needs to make the same power.

So it is unlikely to be as large as a turbo on a STI (2.5L) or evo (2.0L).

Add to that the fact that a 3.0L is blowing more exhaust gas (pre-spool).
Basically, 1200 rpm on a 3L is like 1800 rpm on a 2L. (And the 3L is spinning a smaller turbo.)
So yah, not surprised that it would manage full spool at 1200.


1) turbo is smaller (than an EVO or STI turbo, which use a big turbo to make up for a smaller engine)
+
2) you have more exhaust gas (pre-spool) to get it spooled (since you have more liters than an EVO or STI, you can make more exhaust off-boost, so you can put more force on the turbo to get it spinning.)
=
3) Max torque at low rpm.




I don't expect it to be laggy either. But, they don't mention now long it takes to reach full spool when doing it at 1200 rpm.
You may find that you can hit your target @ 1200 rpm, but it will take 1 second longer than it takes at 3000 rpm, etc. (this is a 'duh' statement, but whatever.).



-scheherazade

[rcracer_tx]

Why go backwards in performnce to a single turbo? the N54 has more torque, and would be just as good as an n55 for making power. I think BMW is pulling a marketing gimmick here with virtually identical engine with a small single because it is cheaper for them to produce...

[scheherazade]

Singles generally outperform duals.

It will just suffer more lag.

But with such a large engine behind it, the lag will be negligible.

Whatever HP/TQ the N55 is rated at, it is there by choice. It could be set 100 hp higher if they just felt like it.

Keep in mind that the N55 single is MUCH larger than the N54 duals, so it will be more efficient, and will have higher maximum power potential.

We don't have data on the N55 turbo. All we have is a picture, and in that picture it's helluva lot larger than the N54 singles.

My previous post that called the N55 single 'small', is simply in comparison to the turbos on an STI or EVO (where the large turbo makes up for a small engine). And for that matter, I'm stating my expectation.

-scheherazade

[smdandb2]

I wonder what compressor/turbine combo they are using.

Something tells me it will run out of steam even earlier than the pea shooters you guys have now.

[dr.roro]

Any info on when we'll be seeing this new engine replace the N54 in the 3 Series?

[scottp999]

FMIC still looks horrible.

[WhiteSled]

Anyone have specs on the turbo? Does the n54 share the same internals with the n55 cause from those picks our internals look pretty damn beefy

[1clean335i]

cant wait to see what kind of potential this motor has

[marcvtec]

Originally Posted by BavarianBullet

They mean multi-hole high pressure direct fuel injector tips, not the intake valves that only see airflow.

Interestingly this is how port fuel injectors started out- single pintle and seat and then multi-hole later on. Hmmm.

I wonder if this will fit the N54 and make more power

[Spool]

Ah the turbo looks so much bigger and better...but why do you hide something like that down there? Put it on top like the Supras

[AJayE92]

Originally Posted by Spool

Ah the turbo looks so much bigger and better...but why do you hide something like that down there? Put it on top like the Supras

to make it less accessible

[Spool]

Originally Posted by AJayE92

to make it less accessible

Werd...but nothing is more attractive than opening the hood and seeing that huge shiny turbo sitting right there...

[GreenPlease]

I'm surprised nobody has thought about ripping a HPFP off an N55 and slapping it onto an N54. Seems like an obvious mod to me and it would probably help beef up the fuel system for the N54 for "big" power.

[Tortfeasor 335xi]

So we have a bigger single turbo than our twin smaller turbos with lower peak torque. I think we should reserve judgment until we get to know more about this turbo's efficiency range. Lower peak torque RPM and lower peak torque numbers says that it likely moves less air than our twin turbos do in aggregate. Basically until someone really pushes the envelope with the new turbos and fueling system we wont know what this car can do with basic bolt ons and EM upgrades. At least with an upgraded Valvetronic (from Vanos) means that tuners will have more parameters they can tweak to help produce more power.

[sd390r]

yeah VANOS sucks