| arghx7 |
05-10-2012 07:56 AM |
Quote:
Originally Posted by serialk11r
(Post 206156)
I was more wondering what the point of this very early peak torque was, because it looks like they're using the wastegate like crazy above 2000rpm.
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Higher engine load = better fuel economy. I don't know how many other ways to say it. The wastegate is there to improve pumping loss and keep the turbo from overspinning of course. They might even be using a vacuum-operated or electric wastegate like BMW or Hyundai respectively. Those types can be operated independent of boost pressure, meaning they can be opened during cold start to warm up the cat and opened during highway cruising to reduce pumping loss.
You are still thinking like it's a WRX with stage 1 reflash.
Quote:
I question the philosophy behind these very high boost at low rpm motors because it seems to me that they are very low speed optimized which is good for FE test cycles which are mostly looking at low acceleration rates and cruising (low load).
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Except for the US06 cycle which requires acceleration at 80mph and responds well to a "downspeeded" engine with high torque provided the mixture doesn't need to be enriched too much.
Quote:
I feel like the real world results (where people driving fast cars are more likely to actually use a bit more power rather than try to accelerate at the same rate as everyone else) would not see as much of an improvement.
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Well, that's always an issue. Some engines are going to do better in the real world than others. The CVT calibration is going to affect it--it depends what rpms the engine is actually running, and when the torque converter locks up.
It may not do as well as advertised but it will be way better than the old H6 did.
Quote:
I guess for the OEM, all that matters is the window sticker and compliance with regulation.
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Up to a point. Hyundai and Honda have had a lot of customer complaints lately about their real-world fuel economy. |
