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  TOV Articles > TOV Dyno Test: 2013 Accord EX 6MT > > Re: Good comparison...

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notyper
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Good comparison... [View Article]    (Score: 1, Normal) 03-07-2013 19:48
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The TSX is running the same size wheels and while it has 10mm wider tires (Pilot HX MXM4), they are listed as the same weight as the Accords Primacy MXV4. So this is about the best head to head you're going to get.

First thing to notice is the flat spot in the TSX curve from 5500-6000 rpm. This is due to Honda putting the VTEC point too high. Imagine a straight line from 5500 to 6000 and you'll get what an optimal curve is for the K24Z7 (without any fuel or ignition tuning, that wouldn't be fair).

So what we're left with then is the K24W producing about 6-8% more output across the board up to 6000 rpm. Why is this? Well first of all, you'll note that the VTEC point on the K24W is at 4800 rpm - much lower than even an optimized Z7. You'll also note how the torque curve of the Z7 falls off sooner.

All this is entirely in keeping with the premise of the K24W which is to optimize the engine for direct injection and bottom end operation. DI requires a high tumble intake port design. This is good for low end torque, bad for high rpm power. DI allows higher compression for a given octane as well (so, 87 octane instead of 91 as required for the Z7). The VTEC point indicates that the cams are smaller, or, at least more biased for low rpm torque. This is all a better fit for the integrated exhaust manifold and close coupled catalyst as well. At lower rpms the exhaust restriction posed by this setup is not nearly as big a problem as it is at high rpm.

So, all in all, where the Z7 is a horribly hamstrung engine trying to combine previous K-series tech with the integrated exhaust manifold, the W is far more suited to this setup with its ports and cams designed for lower rpm operation. There won't be anything happening above 6500 rpm, but let's be honest, there isn't much happening up top with the Z7 either (even de-catted and tuned, the power is pretty flat from a little over 6200 to 7500 rpm).

SC

40mpg
Profile for 40mpg
Re: Good comparison... [View Article]    (Score: 1, Normal) 03-08-2013 16:44
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Jeff,
How about comparing this dyno with the Sport's CVT dyno you had before?

outersquare
Profile for outersquare
Re: Good comparison... [View Article]    (Score: 1, Normal) 03-08-2013 18:41
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The 9G accord also uses electric power steering which is probably worth a couple HP at the wheels.
outersquare
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Re: Good comparison... [View Article]    (Score: 1, Normal) 03-08-2013 18:50
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excuse me, the tsx also apparently uses EPS, only the 8G accord still uses hydraulic.
mp4/5
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Re: Good comparison... [View Article]    (Score: 1, Normal) 05-07-2013 19:41
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I recently purchased a 2013 Accord lx-s 6mt and after looking at the dyno I wonder what difference it would make running the k24w with premium gas, I did switch from regular 87 to 93 octane and the car feels much more alive, even the engine sounds is more aggressive.

 
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