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Discussion Starter · #1 ·

Not a review, per se, but after the usual walk around and driving impressions, they put the car on the dyno and test it out. It appears that their results are pretty close to the factory specs, though I am curious about how the hot and humid conditions affected the performance.
 

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I am actually surprised at two things in the video. 1. that the best they got was ~197HP on a full pull and 2. It has WAY more torque than advertised. The reason it's surprising is that the SI (same engine) has been shown higher than 200HP and the integra was supposed to be tuned specifically to a more sportier ride. Driving mine this past weekend, the difference doesn't matter much. Anything over 55MPH and 2500RPMs and it felt super peppy.
 

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Discussion Starter · #3 ·
So I was wondering about this as well, and there are a couple of things that I'm not sure about:

1. Whether the Honda factory-reported output is at crank or at the wheels (I assume the crank)
2. How Hondata pulled those numbers (looks like it was done with a hub dyno, which bolts the front hubs up to the dyno, doing away with the wheels and tires -- therefore doing away with rolling resistance, I believe):

Having said that, if these HP and torque results were at the wheels, that's not bad... it's hard to perfectly determine what that ends up being at the crank, but you can guestimate it at 110% of WHP -- in this case, about 217HP. And when you keep in mind that the conditions were hot and muggy, and that they couldn't put the car into sport mode (if that would make a difference), those do seem to point to Acura underreporting, just like the Civic Si.

Super interesting stuff. Take everything I say with many grains of salt, however -- I'm not a wrench or an engineer, so I would defer to the experts.
 

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Regardless of your engineering background, look at the details of the dyno pulls and there are some really interesting things to note. First the disclaimer - any dyno is subject to large variations from the conditions (you saw how adding fans in the video changed the numbers significantly) and the settings on the power calculations. All the dyno actually measures is speed and torque - it calculates the HP based on some assumptions and compensation factors. STD correction for horsepower (commonly seen reported with SAE) compensates for air temperature, humidity, and atmospheric pressure to give a standard for comparisons between systems. This doesn't yield perfect numbers and there is a decent amount of variation in numbers seen on dynos from different manufacturers or just performed in different places and times.

I am a little skeptical of these numbers as they look like the reported figures from Acura at the crankshaft, not at the wheels but it is encouraging regardless. There is some driveline losses that would result in less power delivered to the wheels on the order of 10-15%. However, they don't report these as adding compensation factor for these losses or that they are SAE corrected values in the video.

What stands out to me is the torque number. This is a much more reliable measure of the driveability and overall performance. Their first run has a peak torque of 198ft-lb at 2660 RPM, the second peaks at 200 at 4550! That means the torque curve is essentially flat through the range, there is only minor fluctuations that are within the measurement variation of the dyno. That is some awesome performance from a small displacement turbo and they mentioned it wouldn't go into Sport mode for these runs. Not sure if there is any extra performance gain there or not.

Cliffnotes: these dyno numbers are either pretty impressive (10% higher) compared to Acura's official rating or essentially right on. Regardless, this is going to be an excellent car to drive and can't wait for mine to come (supposedly next week!)
 
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