Did you know there were two variants of the Z4M?

[M@r]{]

Well according to Remus anyway :roll: A 335bhp and a 338bhp :rofl:

http://www.remusuk.com/product-finder.asp?man=BMW&mod=Z4+%28E85%29

 

[pvr]

American version?

 

[Adamski]

American version?

Yeah is that not down to lower grade petrol?


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[WLH]

American version?

That's what I was thinking...

 

[pvr]

Emission control which removes some HPs on the way.

 

[WLH]

Emission control which removes some HPs on the way.

Exactly...

 

[Adamski]

Do you think you would notice the difference?


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[markeg]

That 0.89% makes all the difference

 

[sammyz]

Thought the two versions of Z4M were the roadster and the silly one without a folding roof

 

[w1phil]

Thought the two versions of Z4M were the roadster and the silly one without a folding roof

:rofl:

It is the US version. It had a second cat off the headers for their more stringent emissions. You'll see that a lot of US forums talk about upgrading to Euro Headers to release the extra horses

 

[Bing]

All 3 of them... :roll:

 

[pvr]

Thought it was a bit more than 3 though, more like 8 - 10.

 

[WLH]

Thought it was a bit more than 3 though, more like 8 - 10.

I believe it is 10 HP

 

[Bing]

Ahh, so the US ///M can actually end up more powerful than the European one ? I know nothing :roll:

 

[pvr]

Ahh, so the US ///M can actually end up more powerful than the European one ? I know nothing :roll:

No ... take away 10 and add them back again ends up with ... the same as European ones

 

[tombar]

Thought the two versions of Z4M were the roadster and the silly one without a folding roof

at least we dont have to drive in a rain coat when its pissing down with rain oke:

 

[Adamski]

Thought the two versions of Z4M were the roadster and the silly one without a folding roof

at least we dont have to drive in a rain coat when its pissing down with rain oke:

I was out for a road strip yest. Set off in sunshine, and then it started pouring with rain. I didnt get wet oke:

 

[ga41]

Ahh, so the US ///M can actually end up more powerful than the European one ? I know nothing :roll:

No ... take away 10 and add them back again ends up with ... the same as European ones

That's not actually true in practice though. I've seen side by side pictures of the Euro and US catalytic converters and the US actually have LESS substrate material in them which could explain how they can report gains of 20hp or more with just a manifold swap...

 

[Bing]

Ahh, so the US ///M can actually end up more powerful than the European one ? I know nothing :roll:

No ... take away 10 and add them back again ends up with ... the same as European ones

Okay, so notwithstanding the fact that I don't have an ///M, I had to re-sit my maths to get into Uni, and I am not one to often let a question go unasked, irrespective of how stupid it is... How do you come up with that answer then ?

Euro - 338bhp
US - 335bhp
Convert the US car to Euro Cat spec = 10bhp gain
US - 345bhp

345 > 338 therefore the US version ends up more powerful.

Did I miss something ?

 

[mmm-five]

The HP depends on the method used to measure it. UK is using DIN more commonly now, but it used to use SAE, so our figure of 338bhp for the S54 in a Z4M seems lower than the 343bhp for the S54 in an e46 M3. However, that 5bhp loss is down to the standard used, rather than anything to do with the engine's actual power output.

I believe the US one is 333(SAE)/328(DIN) and the EU/UK one is 343(SAE)/338(DIN).

To convert DIN to SAE you multiply the DIN number by 1.014, or divide by the same figure to go from SAE to DIN.