Doctorbass
100 GW
I did received my performance accelerometer/computer this week.
I tested it in my car and then ... with my ebike 8)
I'm talking about this: THE Beltronics Vector FX2
how it work:
It include 2 high precision accelerometer, a timebase (clock) and use some parameter that you enter such as: weight, drivetrain loss, AERODYNAMIC DRAG loss... motor inertia.. etc
Download this presentation video:
http://www.beltronicspro.com/gx2_small.wmv
[youtube]-pC7iuWKic4[/youtube]
[youtube]LFEI73A37ZI[/youtube]
THE USER MANUAL PDF: http://www.beltronics.com/manuals/gx2manualrev1.pdf
MY RESULTS
I tested my integra and got 7.68sec for the 0-60mph wich is close to the real performances
for my ebike at 70V (cell at 2/3 capacity) and 70A current limit, i got:
0-10mph: 0.73sec
0-20mph: 2.65sec
0-30mph: 6.58sec
max speed: 31.9mph.. limited my the missing last battery to reach 100V
HP calculated: 5hp wich correspond to my actual max power(4200W) with this battery configuration and bike weight (108lbs) +me at 145lbs,
that post need to be linked with thisone too: http://endless-sphere.com/forums/viewtopic.php?f=4&t=863&st=0&sk=t&sd=a&hilit=100ft
Soon i'll make a special HIGH POWER low capacity A123 PACK of 100V 4.6Ah that will weight 4.2kg instead of my actual 23AH 75V of 14kg.... i hope that will help!
I want to get 0-40mph under 7sec and 0-30mph under 4sec
Here are some of the parameter you can program to acheive maximum accuracy:
--------- Calibration requirements -------------
1) Vehicle Weight
GVWR is the sum of Curb Weight and Payload (payload is max weight vehicle is designed to carry). We need and want the Curb Weight only, and I'm pretty sure the factory sticker is incorrect if it even lists curb weight. For example, when I rolled up onto a truck scale I remember seeing somewhere around 3880 several months ago. I have a little extra weight in the vehicle from stereo equipment, but that shouldn't be a HUGE change from other stock owners.
2) Horsepower Speed MIN and MAX
This is the speed range for HP calculations and the computer will provide an average HP over these two ranges. Default is 30 to 60 MPH. If you can think of a reason to change this and use different ranges please post why.
3) Drivetrain Loss
All speed6 owners should know and love this one! How much power we lose from our awsome AWD SETUP! A few examples below...
2 wheel drive with manual transmission = .15
2 wheeld rive with automatic transmission = .20
4 wheel drive with manual transmission = .20
3 wheeld rivew ith automatic transmission = .25
These numbers are averages from the book. Please post what you KNOW or "think" you know our vehicle does. I know that the speed6 is mostly FWD, so our power loss might be less than that of an STI or EVO who's AWD setups are probably a bit better and more "active" than ours. But I don't know. Post ideas either way.
4) Rolling Resistance
This one is simple... characteristic of the vehicle's tires. "Most" passenger vehicles, the default of .013 is the proper choice. If you know or think differently please post.
5) Aerodynamic Drag (CDA)
There is a huge long, drawn out description of this and how to calculate it, I will summerize as best as possible. It lists 3 ways to find it.
a) Manufacturer's spec or manual / research.
b) Estimate CDA based on listing of several other vehicles.
Honda Insight = 5.1 CDA
Corvette C5 = 6.2 CDA
Porsche 911 = 6.2 CDA
Audi S4 = 6.8 CDA
Honda Civic = 7.1 CDA
Minivan or SUV = 12.0 CDA
Pickup or Van = 15.8 CDA
c) Coastdown test
On a flat road, on a day with no wind, accelerate to slightly above 60 MPH.
Put your car in neutral.
Measure the time it takes for your car to decelerate from exactly 60 MPH to exactly 50 MPH
Perform this test at least three times in each direction and you should get similar numbers, take the average
I tested it in my car and then ... with my ebike 8)
I'm talking about this: THE Beltronics Vector FX2
how it work:
It include 2 high precision accelerometer, a timebase (clock) and use some parameter that you enter such as: weight, drivetrain loss, AERODYNAMIC DRAG loss... motor inertia.. etc
Download this presentation video:
http://www.beltronicspro.com/gx2_small.wmv
[youtube]-pC7iuWKic4[/youtube]
[youtube]LFEI73A37ZI[/youtube]
THE USER MANUAL PDF: http://www.beltronics.com/manuals/gx2manualrev1.pdf
MY RESULTS
I tested my integra and got 7.68sec for the 0-60mph wich is close to the real performances
for my ebike at 70V (cell at 2/3 capacity) and 70A current limit, i got:
0-10mph: 0.73sec
0-20mph: 2.65sec
0-30mph: 6.58sec
max speed: 31.9mph.. limited my the missing last battery to reach 100V
HP calculated: 5hp wich correspond to my actual max power(4200W) with this battery configuration and bike weight (108lbs) +me at 145lbs,
that post need to be linked with thisone too: http://endless-sphere.com/forums/viewtopic.php?f=4&t=863&st=0&sk=t&sd=a&hilit=100ft
Soon i'll make a special HIGH POWER low capacity A123 PACK of 100V 4.6Ah that will weight 4.2kg instead of my actual 23AH 75V of 14kg.... i hope that will help!
I want to get 0-40mph under 7sec and 0-30mph under 4sec
Here are some of the parameter you can program to acheive maximum accuracy:
--------- Calibration requirements -------------
1) Vehicle Weight
GVWR is the sum of Curb Weight and Payload (payload is max weight vehicle is designed to carry). We need and want the Curb Weight only, and I'm pretty sure the factory sticker is incorrect if it even lists curb weight. For example, when I rolled up onto a truck scale I remember seeing somewhere around 3880 several months ago. I have a little extra weight in the vehicle from stereo equipment, but that shouldn't be a HUGE change from other stock owners.
2) Horsepower Speed MIN and MAX
This is the speed range for HP calculations and the computer will provide an average HP over these two ranges. Default is 30 to 60 MPH. If you can think of a reason to change this and use different ranges please post why.
3) Drivetrain Loss
All speed6 owners should know and love this one! How much power we lose from our awsome AWD SETUP! A few examples below...
2 wheel drive with manual transmission = .15
2 wheeld rive with automatic transmission = .20
4 wheel drive with manual transmission = .20
3 wheeld rivew ith automatic transmission = .25
These numbers are averages from the book. Please post what you KNOW or "think" you know our vehicle does. I know that the speed6 is mostly FWD, so our power loss might be less than that of an STI or EVO who's AWD setups are probably a bit better and more "active" than ours. But I don't know. Post ideas either way.
4) Rolling Resistance
This one is simple... characteristic of the vehicle's tires. "Most" passenger vehicles, the default of .013 is the proper choice. If you know or think differently please post.
5) Aerodynamic Drag (CDA)
There is a huge long, drawn out description of this and how to calculate it, I will summerize as best as possible. It lists 3 ways to find it.
a) Manufacturer's spec or manual / research.
b) Estimate CDA based on listing of several other vehicles.
Honda Insight = 5.1 CDA
Corvette C5 = 6.2 CDA
Porsche 911 = 6.2 CDA
Audi S4 = 6.8 CDA
Honda Civic = 7.1 CDA
Minivan or SUV = 12.0 CDA
Pickup or Van = 15.8 CDA
c) Coastdown test
On a flat road, on a day with no wind, accelerate to slightly above 60 MPH.
Put your car in neutral.
Measure the time it takes for your car to decelerate from exactly 60 MPH to exactly 50 MPH
Perform this test at least three times in each direction and you should get similar numbers, take the average
:wink:
