Variable Compression Engine

Firestar_3x said:
Optimisation of the individual car for known testing conditions is the variable at play.
Click to expand...

The figures are still comparable between cars though.

However lets look at the EPA tests, which are far more reliable for real world conditions than the EU NEDC ones. It's fairly expected that you can hit the highway EPA figure on the highway. I've never driven a car on the highway that wasn't able to hit the quoted figures.

So..

Audi S3 31 US MPG Highway
BMW 340i 33 US MPG Highway

So in terms of efficiency, the 6 cylinder turbo B Series engine is excellent for what it is.
 
Nasher said:
The problem is the more complex things get the more expensive and unreliable they get :(
Click to expand...

Yes, I really find that my current turbocharged, intercooled, ECU controlled fuel injection and ignition control with knock via ionisation measurement within the cylinders is vastly less reliable than my old cars with a carburettor and distributer.
 
Alibaba99 said:
Yes, I really find that my current turbocharged, intercooled, ECU controlled fuel injection and ignition control with knock via ionisation measurement within the cylinders is vastly less reliable than my old cars with a carburettor and distributer.
Click to expand...

In an apocalyptic scenario re read your post and tell me which one you would pick for reliability ;).
 
paradigm said:
In which case the engine in the 340i sounds incredible :cool:

And certainly makes a mockery of the new Nissan VC-T.

And yes, the EA888 is getting quite old now, sure Gen 3's aren't particularly old, but the engine as a whole has been around since 2008.
Click to expand...

Yeah, if the above data is correct then I'm not really sure this VC-T engine is anything of note at all....
 
paradigm said:
I quite agree, however back to the (yes I know, I sound like a fanboy, but in reality it's just because I've done reading up on this particular engine so know it's comparable) Gen3 EA888.

The Gen 3 EA888 with 300PS has book figures of 295BHP, 380NM Torque, 160G/KM emissions, and a quoted economy figure of 40MPG.

The 3.5L V6 in a similar state of tune (in the 350z) has book figures of 295BHP, 353NM Torque, 280G/KM emissions, and a quoted economy figure of 24MPG.

As you can see, the VAG unit smashes the 27% increase in economy.
Click to expand...

Need to consider the losses of RWD, the mass and higher Cd of the 350Z though.

You need the figures when the EA888 is in the Nissan to be able to make any comparison.
 
You must log in or register to reply here.
Back
Top Bottom