[imageWIS]

Instead of using a 3.0L I6 with 2 turbos to achieve 306 bhp, couldn’t they instead use a detuned version of the M3’s 3.2 NA I6 (S54B32)? I mean in natural form the 3.2 makes 333 bhp, thus detuning it to around 3 Liters, should allow it to still make at least 300 horse.

Jon.

[chazmtb]

The 3.2 engine is expensive.....,reltively compared to putting turbos on to the I6 N52 engines.

[E90Fleet]

As said the //M engines use exotic mettals ect ect and are very expensive

Another reason are emissions and fuel consumption reductions which are needed for the newer standards like EU4

[E90Fleet]

Another reason is weight

The M3 engine is pretty heavy compared to the N52

[JO3]

You also get new technologies like Valvetronic and direct injection for the new engine, if I'm not mistaken

[voltron1011]

Efficiency... Torque.... BMW wants a motor that's comparible to a torquey V8 without the weight. Bi-turbo with direct injection is the best idea because it still get's good fuel economy if you are just cruising around.

[Daneel]

but I wonder how BMW intends to maintain a 50-50 weight distribution in the E90 M3, since it will have a V8. Does the M5 have an equal weight distribution?

[lux.sh]

I have question for the weight.

I heard the Bi-turbo I6 isn't magnesium like N52?
Doesn't this mean heavier weight of the motor itself, and now, added turbos = even more weight???
I really wonder how BMW is going to manage weight this time?

Somebody help me.

[imageWIS]

I see. Well, that makes sense from a financial point of view. I wonder then, if BMW will make its own version of the new VW twincharger: a tricharger, perhaps?

http://www.volkswagen-media-services...tlichkeit.html

Jon.

[E90Fleet]

Originally Posted by lux.sh

I have question for the weight.

I heard the Bi-turbo I6 isn't magnesium like N52?
Doesn't this mean heavier weight of the motor itself, and now, added turbos = even more weight???
I really wonder how BMW is going to manage weight this time?

Somebody help me.

It doesnt have the Magnesium outer casing like the N52, but uses the other N52 casting and metal sciences to help keep the weight down.

The Turbos are pretty small, so dont weight much


Here you can see how small the turbos are ( Thanks to the member who took these at Geneva and posted them )

[ic]

Originally Posted by Daneel

but I wonder how BMW intends to maintain a 50-50 weight distribution in the E90 M3, since it will have a V8. Does the M5 have an equal weight distribution?

Use more light weight material at the front, push the v8 more behind the front axles.

Add more weight to the back work too!

[E90Fleet]

Originally Posted by ic

Use more light weight material at the front, push the v8 more behind the front axles.

Add more weight to the back work too!

Yes, M3 is supposed to be getting special lightweight parts for the front

[imageWIS]

Originally Posted by ic

Use more light weight material at the front, push the v8 more behind the front axles.

Add more weight to the back work too!

Yeah, that’s called the Porsche 911 solution. When Porsche couldn’t sell the original 911, (which replaced balanced 4-cylinder 356) with it’s new flat-6 engine, which made it, rear heavy, they simply added weights at either side of the front to balance the car close to a 50/50 f/r weight distribution.

Jon.

[maximinimaus]

Originally Posted by E90Fleet

As said the //M engines use exotic mettals ect ect and are very expensive

Another reason are emissions and fuel consumption reductions which are needed for the newer standards like EU4

Sorry, according to my knowledge the M3 fulfills EU4. The main disadvantage of E46 M3 is, it needs at least ROZ 95, but is designed for ROZ 98, which is expensive in Germany. One aspect for me is insurance, another the taxes in Germany. They are calculated per full 100 cml. E46 M3 has 3246 cml. But You have to pay for 3300 cml. Same procedure with the new 3.0 l Bi-Turbo. As of my knowledge, BMW choosed a stroke/bore of 89,6/84 mm which results in a volume of 2979 cml. The same as current E46 330ci. I'm asking me if they use the same facturing machines for the crankcase of the 335i. The compression ratio will also be the same, 10,2:1. I believe, in the near future, BMW will adjust the volume to nearly 3000 cml(E90 330i has 2996 cml), which will result in an forthcoming(2007 as GregA says) 335si.

[E90Fleet]

Originally Posted by maximinimaus

The main disadvantage of E46 M3 is, it needs at least ROZ 95, but is designed for ROZ 98, which is expensive in Germany. .

There are 2 software versions for the Engine

The 2nd allows it to run fine on 93 ( we never had anything higher here untill this year )

[lux.sh]

Originally Posted by E90Fleet

It doesnt have the Magnesium outer casing like the N52, but uses the other N52 casting and metal sciences to help keep the weight down.

The Turbos are pretty small, so dont weight much


Here you can see how small the turbos are ( Thanks to the member who took these at Geneva and posted them )

damn another slap by E90Fleet. Thanks for the awesome info again.

those are TINY turbos. wow. you can almost call it a N/A.

[E90Fleet]

For interst the list prices for the E46 M3 enine and 330i N52 in europe are

E46 M3 - 14,500 euro
330i N52 - 8,200 euro

The M3 uses a number of special parts to allow it to rev to 8,000Rpm without any problems

[David328M-Sport]

Originally Posted by JO3

You also get new technologies like Valvetronic and direct injection for the new engine, if I'm not mistaken

From what I understand, the bi turbo engines do not have valvetronic.

[tctic]

There is no Valvetronic in the new Bi-Turbo engine. That had been discussed before. The link that you showed is most likely an error.