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Increase Horsepower through
tuning with Auto Dyno's Mobile Dynamometer by
BahnTech
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Auto Dyno Performance Meter:
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BahnTech’s AutoDyno Performance Meter
is the first to combine Dynamometer, Performance, and Tuning functions into
one unit. AutoDyno is a
full-featured dyno graphing up to nine horsepower and torque runs
simultaneously. Performance data is also collected including 0-60 Times, ¼
Mile Times, Passing Speeds, Braking Distance, and Acceleration GForce.
AutoDyno is also an advanced tuning tool featuring up to four 0-15v
data collection channels sampling 100 times a second.
These channels can be used to record Wide Band O2, MAF, Throttle
Position, MAP, Boost, or other vehicle sensor data.
Your
vehicles performance is only as good as the tools used to create it.
AutoDyno is a must-have tool for the serious tuner. |
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Our Auto Dyno product is an entire Vehicle Information System
[VIS]. This includes all hardware and software to measure engine
horsepower, brake horsepower, collect data, view
it in real time, and graph it with advanced post processing data conditioning. The processed data includes
Horsepower and Torque at the
Flywheel and the Rear Tires. We also measure your 0-60 [and all other
0-x Times], 60', 1/4 Mile, 1/8 Mile, Max Speed, Braking Distance, and
Passing Speeds. This data is displayed on your Notebook
PC both in real time and after the run. |
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Auto Dyno can record up to 9 horsepower and torque
dynamometer runs and graph them together on one graph. Dynamometer
runs can be saved to your hard disk and reloaded later for
review. Recorded runs can also be played back in real time
or slow motion.
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Auto Dyno supports full hands free operation. Auto Dyno can be programmed to
start recording data when your throttle is pushed all the way to the
floor and record as long as it stays there or for a preset period of
time. It can also work like a
camcorder with Record, Play, and Pause buttons. The Record
button can be set to delay X seconds before recording starts. This
gives you time to prepare for the test run. |
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Auto Dyno has two real time displays: [Automotive Analog and
Digital]. These display your current Vehicle Speed, RPM, and up
to four 0-15v Inputs. This allows you to monitor other sensors while
you drive.
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Auto Dyno Vs AutoDyno Pro
BahnTech makes two versions of AutoDyno. The
basic version and the Pro version. The differences are: |
| Feature |
AutoDyno |
AutoDyno
Pro |
| Model
Number |
BT-AD11 |
BT-AD12 |
| Screen
Shot |
Click |
Click |
| All
Features are the same except: |
| How
many Test Runs can be Compared at once? |
4 |
9 |
| 0-15v
Data Collection Inputs |
0 |
4 |
| Price |
$159.99 |
$199.99 |
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Auto Dyno Pro Monitors up to four 0-15 Volt sensors and samples them at 100 Samples/second
[100Hz]* *(AutoDyno Pro Only)
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Other Sensors Might Include:
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- Throttle Position Sensor
- O2 Sensors
- MAF Sensor [Mass Air Flow]
- Boost PSI
- Any other Automotive Sensor [0-15v]
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These four 0-15v inputs are displayed in real time as you drive and are
recorded and can be graphed verses each other and/or Time, RPM, HP [Horsepower],
TQ [Torque], G Force, Speed, etc.
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Performance Data
| Performance Data: |
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Time To Distance: |
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- 1/8 and 1/4 Mile Times
- 60' Times
- 330ft Times
- 1000ft Times
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| Acceleration: |
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Braking Distance: [Screen
Shot Link] |
- 0-30
- 0-40
- 0-50
- 0-60
- 0-70
- 0-80
- 0-90
- 0-100
- 0-110
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- 10-0
- 20-0
- 30-0
- 40-0
- 50-0
- 60-0
- 70-0
- 80-0
- 90-0
- 100-0
- 110-0
- 120-0
- 130-0
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| Passing Speed Times: |
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Four 0-15v A/D Inputs
[AutoDyno Pro Only]
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Aerodynamic Drag [Cd and
Cda] and Rolling Resistance |
- O2 Sensors (+Wide Band 02)
- Throttle Position Sensor
- MAF Sensor [Mass Air Flow]
- Boost PSI or MAP
- VTEC, VarioCam
- Any other Automotive Sensor [0-15v]
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AutoDyno
Installation Pictorial |
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Screen Shots of Auto Dyno Software
(Windows98, W2K, XP) |
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| (Click image for larger version) |
| Horsepower Vs
Torque / RPM [BHP and RWHP] |
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| GForce Vs Time |
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| RPM Vs Time |
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| Custom Graphing Capabilities
[Multiple Data / Multiple Axis] |
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| Throttle Position AND MAF
[Mass Air Flow] Vs RPM |
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| Real Time Telemetry Data
From Vehicle [Analog] |
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| Real Time Telemetry Data
From Vehicle [Digital] |
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| These are only a few graphing capabilities contained in
the Auto Dyno software suite. |
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| Does Auto Dyno need to be
installed? |
| Yes. You will need to
have at least 4 of the 8 wires connected to 12v, Ground, RPM wire, and Speed [VSS] Wire. The other
four 0-15v A/D inputs
are optional.
A speed shop should be able to completely install and test an
AutoTop module in less than 1hr. It is easier to install
than an aftermarket radio in some cars. |
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| Will Auto Dyno work on my
car? |
| Most likely. Auto Dyno works on most late model vehicles manufactured after 1992 and almost
all models after 1996. All you need is a VSS Speed wire and a Tachometer RPM wire. You can check out Rostra [Not related
to BahnTech in any way, just a Cruise Control manufacturer that has a
page with the location of the VSS Pins.] http://www.rostra.com/techsupport-main.asp |
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| Where can I buy aftermarket Wheel Speed
Sensors (VSS) for older vehicles? |
| Classic and older Model vehicles might
require an Aftermarket Wheel Speed Sensor [Speedometer Sender] for the
VSS Input. BahnTech does not sell these sensor kits, but they
are readily available from many online sources. Here are a few
systems that will "most likely" work. These systems
change and BahnTech can not guarantee they will work with our
system. The requirement is a pulsed square wave output that
varies with speed. The maximum voltage of the pulse is 15v, the
minimum is 1v. This requirement is met with most aftermarket
Hall Effect VSS speed sensors. The only sensors that do NOT meet
this requirement is ABS Type Reluctance Sensors that have AC outputs
that vary in amplitude/frequency with speed. Sensors that have
only two wires will probably NOT work. Make sure you purchase a
three wire speedometer sender.
Possible Sources:
DakotaDigital.com
SEN-1019 [Generic sending unit, designed for Motorcycles, but will
work on most vehicles]
EGauges.com
ATM-5291, ATM-5292 [Ford and GM]
VDO
340-011, 340-012, 340-013, 340-014 [Ford and GM]
SummitRacing.com [Ford
and GM]
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| What if my car is not listed
at Rostra? |
| Get your workshop manual and find
the ECU on your cars wiring schematic [Chilton's, Factory workshop
manuals, etc] and see if there is a Speed and RPM wire. These
wires are usually connected to the ECU. |
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| Will it work with my
Notebook PC? |
| Probably. You will need a
fast PC because the Auto Dyno software collects and checks for data
integrity in real time. Your PC will need a 9pin Serial port or
a Serial to USB Converter.
If you have a slower PC you might increase your accuracy by using a
USB Converter even though you have a 9pin Serial port. The USB
serial data requires much less overhead on the CPU, thus allowing you
to use a slightly older PC and still have a reliable system.
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| Feature |
Min
Tested |
Recommended |
| Processor
Speed |
PIII
866 |
Pentium
4 |
| Memory |
64Meg |
128Meg |
| Free
Hard Drive Space |
10M |
20M |
| 9
Pin Serial Ports |
0* |
1 |
| Portable
Battery Powered Notebook** |
YES |
YES |
| Video
Resolution |
800x600 |
1024x768 |
| Operating
System |
W2K |
W2K,
XP, NT4 |
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| * If your PC does NOT have a serial port you will
need to purchase a 9 Pin Serial to USB Converter ($30) from Best
Buy, Frys, etc or just order one from us. |
| ** The AutoDyno system requires the
AutoDyno Hardware and a Notebook PC to collect the data.
Without the PC in the vehicle you can not collect data.
This was a design consideration to keep the total system cost
low. |
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| How does Auto Dyno work? |
| Auto Dyno can very accurately
calculate your Horsepower and Torque by using Speed, RPM, and Vehicle
Weight. It then adjusts from wheel Horsepower [WHP] to
Block Horsepower [BHP or Flywheel Horsepower] by factoring in
Transmission Loss. Aerodynamic loss is calculated using your
vehicles Frontal Area and Drag Coefficient and is used to correct your
final Horsepower and Torque data for Horsepower loss due to
Aerodynamic Drag. |
| Auto Dyno collects real time
Speed and RPM data as well as up to four 0-15v A/Ds at an interval of 1/100
Sec [100Hz]. It then sends the data to the Auto Dyno Windows based software.
The Auto Dyno Windows software does all of the calculations
for Horsepower [HP], Torque [TQ], G Force, etc and presents the data
in various common graphs and virtually limitless custom graphs. |
| Auto Dyno Data has been proven
time and time again by our >100 beta test sites. These test
sites vary from road race teams, drag teams, and hobby automotive enthusiasts. |
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| Where can I get more information on Auto
Dyno Horsepower Calculations? |
| Here is a Link
to more information on Auto Dyno Horsepower Calculations |
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| Where can I get more information on Auto
Dyno Coast-Down Calculations? |
| Here is a Link
to more information on Auto Dyno Coast Down Calculations |
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| Does AutoDyno use an
Accelerometer like your competition? If not why? |
| AutoDyno uses your Vehicles VSS
(Vehicle Speed Sensor) to measure velocity and acceleration not an
accelerometer. Accelerometers are an effective way to measure
acceleration for short durations, especially in a clean controlled environment.
However an automobile is far from a clean environment. When you
accelerate your suspension rolls and the front of your vehicle
raises. Accelerometers can not tell the difference between roll,
gear shifting, lift, road grade, and forward motion, and thus think
the vehicle is accelerating faster than it is. Bumps in the road
also induce false acceleration. All of this false acceleration
is really noise. During short durations this noise can be
filtered, but it is amplified by time and quickly results in
inaccurate results. We have tested these units and show 2mph
inaccuracies at 60mph and >5mph error at 80mph. This error
varies depending on road grade, firmness of suspension, etc.
Here is a quote from the GTech Pro website:
"Due to the high precision of the Gtech's accelerometers,
things such as gearshifts, bumps in the road, etc. can add a little
noise to the forward acceleration data."
The correct question is: "If you do 4 test runs
sequentially, how much variation will you have in your
results?" You will find that AutoDyno has about the same
variation as a Chassis Dynamometer. Accelerometer based products
can vary by 10-15%.
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| Does AutoDyno use OBD2? If not why? |
| No Auto Dyno collects Data directly via a
RISC based microprocessor running at 8MHz. OBD2 has a few limitations
that Auto Dyno has overcome by directly accessing data. The first limitation is in the maximum frequency the OBD2 port can
deliver data. OBD2 was designed as an onboard diagnosis system,
not for data collection. This the speed of the interface is
quite slow when you are trying to measure a hundredth of a second
change in performance. The best we have seen from OBD2 is 10Hz
or 10 samples per second. They advertise resolutions as high as
20 samples per second.
The second limitation is in "high speed" mode [10 samples
/ sec] you can only collect one parameter. This means you can
not record Speed and RPM at the same time, nor any other vehicle
data. Auto Dyno collects Speed, RPM, and 4 analog 0-15v inputs
at 100Hz with much oversampling.
With only speed you can calculate Horsepower but not Torque.
OBD2 vendors work around this issue by guessing RPM based on final
drive gear ratios and speed. This means they are guessing at
your gear, then guessing at your RPM. We have found this type of
calculation to be +/- 10-20%, especially on automatic vehicles.
| Method
of collecting Data |
Hertz |
Samples
/ Second |
Record
Both Speed and RPM? |
Resolution |
0-60
Time Examples |
| OBD2
(PDA-Dyno) |
20Hz |
20* |
No |
0.05
Sec |
4.3
Sec |
| Accelerometer
(GTech, PocketDyno) |
100Hz |
100 |
Yes |
0.01
Sec |
4.28
Sec |
| Direct
Sampling @ 8MHz (AutoDyno) |
100Hz |
100 |
Yes |
0.01
Sec |
4.28
Sec |
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| *20 samples per second is a theoretical
maximum. In practice you can expect 10 samples per second.
At 10 samples per second your best resolution is a tenth of a second and on some cars it is a full second
between data points. |
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| How is the unit calibrated
for my Speedometer and RPMs? |
| The Auto Dyno PC Software has
calibration routines for the Speedometer VSS input and the RPM
input. This allows it to work on most vehicles with little
effort and a minimal setup time. This also allows for a
more accurate reading than OBD2 or your speedometer. |
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| What makes AutoDyno a better
value than the competition? |
| AutoDyno might not be the best
Dynamometer on the market, although our Features Vs Price puts us in a
class of our own. |
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| What is included in the box? |
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The Auto Dyno and Auto Dyno Pro Kits come complete
will everything you need to install the product immediately.
- Auto Dyno Hardware [Microprocessor Controlled Brain]
- Auto Dyno PC Software on CD-Rom
- Serial Cable
- Wiring Harness
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| Feature |
DYNOmite
or Mustang
Dyno |
GTechPro |
Nology
PDA-Dyno |
PocketDyno |
AutoDyno |
AutoDyno
Pro |
| Model
Number |
035-500-1K
OR MD-250 |
Pro |
440
001 011 |
Ultra |
BT-AD11 |
BT-AD12 |
| Screen
Shot |
Click |
Click |
Click |
Click |
Click |
Click |
| Major
Features |
| How
many Test Runs can be Compared at once? |
2 |
4 |
1 |
1 |
4 |
9 |
| 0-15v
Data Collection Inputs*(4) |
Yes/No |
No |
0 |
No |
0 |
4 |
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| Custom
Graphing |
No |
No |
No |
No |
Yes |
Yes |
| Enhanced
Graphing and Charting |
Some |
Yes |
No |
No |
Yes |
Yes |
| Start
testing from non-zero Speed*(1) |
Yes |
No |
Yes |
No |
Yes |
Yes |
| True
Speed OR Accelerometer*(2) |
Speed |
Accel |
True |
Accel |
Speed |
Speed |
| No
mounting required? |
No |
No |
Yes |
No |
Yes |
Yes |
| Factors
Aerodynamic Drag into Calculations? |
No |
No |
Yes |
No |
Yes |
Yes |
| Factors
Rolling Drag into Calculations? |
No |
No |
No |
No |
Yes |
Yes |
| Corrects
HP to SAEJ1349 standards?*(3) |
Yes |
No |
No |
No |
Yes |
Yes |
| Playback
of Recorded Data |
Yes |
Yes |
No |
No |
Yes |
Yes |
| Throttle
Position Based Recording*(5) |
No |
No |
No |
No |
Yes |
Yes |
| Countdown
to Record |
No |
No |
Yes |
No |
Yes |
Yes |
| Automotive
or Digital Gauges |
No |
No |
No |
No |
Yes |
Yes |
| Measurements |
| Horsepower |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
| Torque |
Yes |
Yes |
Yes |
No |
Yes |
Yes |
| RPM |
Yes |
Yes |
No |
No |
Yes |
Yes |
| 0
- Speed (0-30,0-60, etc) |
No |
Yes |
Only
0-60 |
No |
Yes |
Yes |
| G
Force (Acceleration) |
No |
Yes |
No |
Yes |
Yes |
Yes |
| Braking
Distance |
No |
Yes |
No |
No |
Yes |
Yes |
| 0-60
Times |
No |
Yes |
Yes |
Yes |
Yes |
Yes |
| 1/8
+ 1/4 Mile with Speed |
No |
Yes |
Yes |
Yes |
Yes |
Yes |
| Passing
Speeds (30-50,40-60,etc) |
No |
Yes |
No |
No |
Yes |
Yes |
| Calculated
Max Speed*(6) |
No |
No |
No |
No |
Yes |
Yes |
| BHP
or RWHP Calculations |
No |
No |
No |
No |
Yes |
Yes |
| Ram
Air HP Increase |
No |
No |
No |
No |
Yes |
Yes |
| Resolution |
0.01
Sec |
0.01
Sec |
0.1
Sec |
0.01
Sec |
0.01
sec |
0.01
Sec |
| Warranty
/ Return Policy / Price |
| Made
In USA |
USA |
China |
? |
? |
USA |
USA |
| Warranty |
90
Days |
1
Year |
1
Year |
90
Days |
3
Year |
3
Year |
| 30
Day Money Back Guarantee |
All
Sales Final |
Yes |
Yes |
No |
Yes |
Yes |
| Shipping
+ Handling |
>$500.00 |
$9.04 |
10.00 |
$11.20 |
$8.00 |
$8.00 |
| Price |
>$25,000.00 |
$249.95 |
$348.50 |
$399.99 |
$159.99 |
$199.99 |
| Total
Price
(Product + Shipping + Handling) |
>$25,500.00 |
$258.99 |
$358.50 |
$411.19 |
$167.99 |
$207.99 |
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| *(1) Some products use Accelerometers.
These devices make you start your test from a dead stop.
This is very inconvenient for HP runs. With AutoDyno you
can be driving at < 2000 RPM and any gear and just put the
gas pedal to the floor. |
| *(2) Accelerometer based products tend to loose
accuracy the longer the test run. Thus from 20-40mph they
might be very accurate, but by 80mph they are usually inaccurate
by at least 5mph. Speed Sensor (VSS) based systems are
accurate from 0-Top Speed. |
| *(3) SAE Corrections are based on standard conditions: Air Temperature 77°F, Altimeter Pressure 29.235 Inches-Hg,
Relative Humidity 0%. If your conditions deviate from
standard conditions the SAE J1349 specification provides
formulas to correct your HP/TQ measurements back to standard
conditions. |
| *(4) These inputs can be used to monitor some
of the following parameters: 02 Sensors, Throttle
Position, Mass Air Flow Sensor, Manifold Air Pressure, Wide Band
02, VTEC, VarioCam, VarioRam, NOS, etc. |
| *(5) This allows the Auto Dyno to automatically
start recording then the throttle is opened beyond its preset threshold:
i.e. My max throttle position puts 4.45 Volts out of the TPS
(Throttle position Sensor), thus I set my Record threshold to
4.3Volts. When 4.3V is exceeded the Auto Dyno
automatically starts recording.
This is not only convenient but also a major safety feature,
by allowing complete hands free usage of the system. |
| *(6) Calculated Maximum Speed is a
complicate equation. AutoDyno uses the following to
calculate maximum speed: Outside Temp, Humidity, Altimeter
Pressure, Aerodynamic Drag [Cd], Frontal Area, Rolling Drag, Ram
Air effects, and Horsepower to correctly calculate maximum
speed. |
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| What is the Warranty on
AutoDyno? |
| There is a 3 Year Replacement Warranty
on all BahnTech products. |
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| What is your return policy? |
| There is a 30 Day Return
Policy
on all BahnTech products. |
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| Is your Installation Documentation
Online? |
| Yes. View Auto
Dyno Installation Documentation in HTML or download the WORD Doc. |
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| Purchase AutoDyno |
| AutoDyno can be purchased online. |
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