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He asked in Cars & TransportationCar MakesHonda · 2 months ago

Is there a big difference in power between trading vtec for turbo in the new vs old Honda Si if the horse power mostly remains close?

Say if the new honda si horse power is 206 hp with turbo.

The previous year before the turbo is 203, but has v-tec.

Same skilled driver races, would you say it would be close even with the turbo since both hp is near?

3 Answers

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  • 2 months ago

    What's more important than peak horsepower rating is the area under the torque curve over the entire RPM range of an engine.  While the old non-turbo engine may make similar peak HP to the newer turbo engine, the turbo engine will make significantly more power at "off-peak" RPM.  The result - the turbo engine will feel significantly more powerful at RPM below ~6000 because it's actually producing significantly more power from ~2500RPM - ~6000 RPM than the non-turbo engine, even if their peak HP ratings are virtually identical.

    What that means for a race, assuming the cars are otherwise similar in weight/traction/handling capability etc., is that the turbo engine'd car would almost certainly be faster even if their peak horsepower ratings are very close.  If the turbo engine'd car is signifcantly heavier or has lesser tires or a soft suspension setup etc., then you'd have to factor those things in to guess who'd win in any sort of a race. 

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  • Anonymous
    2 months ago

    Turbos provide more torque at lower revs than naturally aspirated cars. This improves the driving experience. 0 to 60 times will be shorter.

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  • Anonymous
    2 months ago

    It's not just about hp. Among other things, you'd need to examine the specs on gearing, torque vs rpm profiles and horsepower to weight ratios of the two vehicles. I'm not going to do that for you unless you're willing to pay for my time to find and analyze the published data. 

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