PencilGeek
Well-Known Member
- Joined
- Feb 17, 2017
- Threads
- 3
- Messages
- 225
- Reaction score
- 195
- Location
- Northern California
- First Name
- Robert
- Vehicle(s)
- 2017 GT350R HR278, 2008 BMW M3
- Thread starter
- #1
EDIT: These results are not valid. Please see updated results here: http://www.mustang6g.com/forums/showthread.php?t=81318
Today I got my first chance to take the car out with the vBox attached. I took it to a place down in Mexico that a few of us know as "Steve Dinan's raceway." It's a perfectly secluded 4-lane highway with protective high guard rails on both directions, with no side streets in one of those directions.
I intended to do a full 0-130 run, but that got botched when I did a rolling start from about 1 MPH. I botched two gear shifts when I barely bounced off the RPM limiter. Regardless, it was good enough for a baseline.
I was a bit curious what kind of wheel horsepower would be calculated with the vBoxDyno, so I collected as much info as I could, then I hit a brick wall (so to speak). The three hardest pieces of info were the wheel weight, drag coeeficient, and frontal area. For wheel weight, I started with the Carbon Revolution wheels for GT-R, and added three extra pounds. But as hard as I tried, I couldn't find any data, other than speculation, on drag coefficient or frontal area. Does anybody know where to get this? I ended up using 0.32 Cd, and 24.2 sq-ft frontal area. These were somewhat educated guesses as I started with the 2012 Mustang Boss 302 and shaved the drag coefficient from 0.36 to 0.32, and kept the same 24.2 sq-ft frontal area. But if anybody knows the real numbers, I'll re-do the vBoxDyno with the real numbers.
Here's the results:
9.204 seconds 60-130 with 494 calculated rwhp. The rwhp numbers were corrected using SAE J1394 horsepower correction formula using the weather data that was collected from the car's CAN bus while driving. I'll have a lot more on that subject later.
Today I got my first chance to take the car out with the vBox attached. I took it to a place down in Mexico that a few of us know as "Steve Dinan's raceway." It's a perfectly secluded 4-lane highway with protective high guard rails on both directions, with no side streets in one of those directions.
I intended to do a full 0-130 run, but that got botched when I did a rolling start from about 1 MPH. I botched two gear shifts when I barely bounced off the RPM limiter. Regardless, it was good enough for a baseline.
I was a bit curious what kind of wheel horsepower would be calculated with the vBoxDyno, so I collected as much info as I could, then I hit a brick wall (so to speak). The three hardest pieces of info were the wheel weight, drag coeeficient, and frontal area. For wheel weight, I started with the Carbon Revolution wheels for GT-R, and added three extra pounds. But as hard as I tried, I couldn't find any data, other than speculation, on drag coefficient or frontal area. Does anybody know where to get this? I ended up using 0.32 Cd, and 24.2 sq-ft frontal area. These were somewhat educated guesses as I started with the 2012 Mustang Boss 302 and shaved the drag coefficient from 0.36 to 0.32, and kept the same 24.2 sq-ft frontal area. But if anybody knows the real numbers, I'll re-do the vBoxDyno with the real numbers.
Here's the results:
9.204 seconds 60-130 with 494 calculated rwhp. The rwhp numbers were corrected using SAE J1394 horsepower correction formula using the weather data that was collected from the car's CAN bus while driving. I'll have a lot more on that subject later.
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