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article details
Author Jeff Palmer
Categories Dyno Testing, Accord
Create Date November 06, 2012 07:14
Last Update November 08, 2012 16:50
2013 Accord Sport CVT

Having sampled many flavors of pre-production Accords at a press event in August, we were anxious to see what Honda's new Earth Dreams i-VTEC 4-cylinder would do on a chassis dyno. A few weeks ago, we managed to get our hands on a production version of Honda's brand-new 2013 Accord Sport CVT, so we promptly took it over our normal testing facility (Dynolab in Marietta, GA) and strapped the car to the rollers.

We were hoping to sample the 6MT version of this car, but they are not yet available in the press fleet for loan. Thus, the dyno charts you will see here are a little bit different than what you might be accustomed to seeing. For one thing, the fact that this car is a CVT means that plotting HP and Torque curves against an RPM-based x-axis just doesn't work very well, so that's why we have split up these charts. Also, we made a few passes in the simulated 7-speed "Sport" mode in an attempt to emulate what an in-gear pass on a traditional manual transmission car would look like, but even in the "fixed" gear runs there was a little bit of variable gear ratio action going on. See the charts and notes below.

CVT Mode Dyno Plots (click to enlarge)

Here are the horsepower and torque curves plotted against roller speed. In this plot the Accord was tested in the standard D mode.
In this plot, we show the horsepower vs the roller speed, but also plot the rpm curve on the secondary y axis to show how the revs build and hold.
This is just like the above chart, except this shows the torque curve along with the rpm curve.
This is an interesting plot which shows the CVT's effective gear ratio (expressed as rpms/mph) along with the horsepower curve

"Fixed gear" S Mode Dyno Plots (click to enlarge)

This is the horsepower and torque curves vs rpm in "S" mode with it locked into 3rd gear. We discovered that the transmission automatically upshifts in this mode as it reaches the rev limiter
This plot shows horsepower in the S3 mode alongside the calculated gear ratio. You can see that even in the stepped gear modes, there is some variation in the effective gear ratio
This is just like the above chart, except this shows the torque curve along with the effective gear ratio. The scale for the gear ratio axis is more exaggerated in this plot.
This plot compares output in "D" mode vs the fixed gear "S" mode. As you can see, maximum average power is clearly delivered in CVT mode. Ignore the big blip at the end of the S-mode plot (red). That's where the transmission upshifted
There is indeed another page, complete with a video clip and our conclusions. Click the "Next Page" link below.







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Date Thread Starter Thread
11-08-2012 16:15 How does the VTEC sound?   (Score: 1, Normal) Hondatalover
11-08-2012 16:48 JeffX
11-08-2012 17:29 JP
11-08-2012 19:48 Hondatalover
11-09-2012 09:15 atomiclightbulb
11-09-2012 11:34 JeffX
11-09-2012 12:18 atomiclightbulb
11-09-2012 15:53 Hondatalover
11-08-2012 18:55 xBeastx
11-09-2012 17:37 TonyEX
11-09-2012 23:48 Zoopa
11-09-2012 23:50 Zoopa
11-09-2012 23:52 Zoopa
11-10-2012 11:44 Hondatalover
11-16-2012 10:00 rocky
11-09-2012 23:44 Wow, check out the CRT   (Score: 1, Normal) Zoopa
11-09-2012 17:35 variations on Figures 3 and 4 on different rurns?   (Score: 1, Normal) TonyEX
11-09-2012 03:23 side-by-side comparison with non-vtec?   (Score: 1, Normal) Restless
11-09-2012 07:25 Restless
11-09-2012 09:08 atomiclightbulb
11-08-2012 13:31 190.41 hp on the crank assuming 15% loss...   (Score: 1, Normal) JP
11-08-2012 18:23 danielgr
11-08-2012 18:47 JP
11-08-2012 22:52 danielgr
11-09-2012 08:22 WongKN
11-08-2012 10:35 Interesting   (Score: 1, Normal) 6SPDTL
11-08-2012 11:59 Rental_beater
11-08-2012 12:50 JDMImport
11-08-2012 12:53 JDMImport
11-08-2012 13:06 JeffX
11-08-2012 13:16 JDMImport
11-08-2012 17:57 JDMImport
11-08-2012 13:09 JeffX
11-09-2012 04:45 Mechanic
11-08-2012 22:37 Thanks!   (Score: 1, Normal) danielgr
11-08-2012 11:23 The "other" S mode   (Score: 1, Normal) talon95
11-08-2012 13:04 JeffX
11-08-2012 13:52 talon95
11-08-2012 13:24 Jeff, do you have the HP vs. mph chart of the 2012/2011 Civic Si?   (Score: 1, Normal) JP
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