[E90Fleet]

Originally Posted by Garissimo

Also, has anyone seen the size/location of the intercooler on the 335i?

Its in the thread with the official N54 pictures

[RPM90]

Originally Posted by Garissimo

23psi is crazy high boost! That can't be right. That's more than the Mitsu Evo's turbo cranks, out and that thing is turned up pretty high from the factory.

Also, has anyone seen the size/location of the intercooler on the 335i?

I doubt it too.
That much boost in a 10.2:1 compression ratio 3.0 liter inline 6 would be AMAZING HP with a very stressed engine.
Plus, those fist sized turbo's would be an amazing feat of performance if they could muster that kind of compression.

.6 bar seems quite plausible.

[goldminer]

Originally Posted by stressdoc

IMO there is little doubt but that the engine management is very conservative, limiting power to avoid reliability issues and perhaps enhance fuel efficiency. The CR is 10.2. Boost is low and steady, 1.6 (about 3.5 in US lingo).

1.6 what? Bar? If so, 1.6 bar is about 8.7 psi of boost.

[goldminer]

Originally Posted by Garissimo

23psi is crazy high boost! That can't be right. That's more than the Mitsu Evo's turbo cranks, out and that thing is turned up pretty high from the factory.

Also, has anyone seen the size/location of the intercooler on the 335i?

In Europe they tend to quote turbo boost in terms of absolute pressure in the plenum (atmospheric pressure plus the boost). In north america we we tend to quote only the amount of boost over and above atmospheric pressure given by the turbo.

23 psi in Europe would be presented as 8.3 psi (23-14.7) here in north america.

[EnI]

Originally Posted by goldminer

In Europe they tend to quote turbo boost in terms of absolute pressure in the plenum (atmospheric pressure plus the boost). In north america we we tend to quote only the amount of boost over and above atmospheric pressure given by the turbo.

23 psi in Europe would be presented as 8.3 psi (23-14.7) here in north america.

Absolutely correct.

NA engine has 1.01325 bar pressure (= atmospheric pressure only), while this specific bi-turbo has 1.6 bar -> so 0.5875 bar (= 8.52 psi) actual pressure / boost added.

[ogrady]

Nice we got some physicists on here

So the conclusion is that the turbo is running about 8.3-8.5 PSI??

[EnI]

Originally Posted by ogrady

Nice we got some physicists on here

So the conclusion is that the turbo is running about 8.3-8.5 PSI??

8.52 psi

[goldminer]

Originally Posted by cobradac

.....
and my torque conversion obtains from 400Nm the following
295.0248 ft-lb with no European/USA distinction.
I use the official formula from SAE TSB 003, dated 1999, where ft-lb to Nm for engines = 1: 1.355818.

While there is no distinction between a Nm or ft-lb between Europe and North America I believe there there may be differences in the conditions mandated for the test.

The new SAE horsepower rating system sets out very specific test conditions specifying such parameters as fuel and oil types to be used, accesories drives, intakes filters and exhausts which must be connected, corrections made for ambient temperature and humidity, etc. It may just be possible the required test conditions are slighlty different between DIN and SAE horsepower? Just a guess.

[goldminer]

Originally Posted by GregA

8.52 psi

This is correct. i was just doing an example conversion of the approximate estimate of 23 psi given in an earlier post.

[stressdoc]

Bingo.
I should have noticed the "Ladedruck maximum absolut"

[Garissimo]

Originally Posted by goldminer

In Europe they tend to quote turbo boost in terms of absolute pressure in the plenum [...]

Ahaaa...it all makes sense now. Thanks for the clarification.

So I guess the question for people who are going to mod this car is, at what point will those little 'mini-Me' turbos be out of their efficiency range?

[visor]

Originally Posted by E90Fleet

The new DI is only for europe for the moment, untilll more countries get the lower sulphure fuel

I know.
But I'm not referring to the increase in hp/tq for the DI engine.
I'm comparing the N52 on that table you posted with the current N52.

If you look at the column for the Valvetronic N52 (265hp/232lbft) vs. the DI N53 (272hp/232lbft), you'll notice there is an increase of 10hp/12lbft for the Valvetronic N52 engine over and above what we know it has produced in the past (255hp/220lbft). This is without the DI hardware.

So, somehow BMW was able to massage more hp and tq out of the N52 engine!

[stressdoc]

265 hp is the standard euro figure for the short exhaust version (130). I bet the torque figure is a typo.

[jasper]

those torque curves look highly suspect to me

[tctic]

Originally Posted by jasper

those torque curves look highly suspect to me

I think they should be accurate considering BMW usually underrates rather than overrates these figures.

[visor]

Originally Posted by tctic

I think they should be accurate considering BMW usually underrates rather than overrates these figures.

What he means is that the N54's torque curve looks too table-flat to be realistic.

[EnI]

Originally Posted by jasper

those torque curves look highly suspect to me

It's not a fiction! It's reality!

What can I say: BMW! Bavarian Motor Works. That "M" (Motor) letter / word in "BMW" has a meaning. It's there for a reason.

Btw, BMW are going for the Engine of the Year award 2006 with the N54!

[EnI]

Originally Posted by stressdoc

265 hp is the standard euro figure for the short exhaust version (130). I bet the torque figure is a typo.

Not at all.

Visor is right.

The N52 3.0L engine in 330i has an output of 258HP / 300Nm, while the N52 3.0L engine in 130i & Z4 3.0si can produce 265HP / 315Nm.

The engine in 330i has more conservative exhaust settings.

[Kalin]

Originally Posted by visor

What he means is that the N54's torque curve looks too table-flat to be realistic.

It looks like marketing material vice an actual dyno output. Take the VW / Audi 1.8t engine for example... if you dummied the graph down for a powerpoint presentation to the media, it'd be flat like the N54 graph:

[black335i]

lol

[135Hoser]

Originally Posted by black335i

lol

You bumped a 7 year old thread to say 'lol'?