TT-1 Wide Band AFR/Lambda Users Manual
Dynamic EFI TT-1 End User Agreement
THE PURCHASER IS
RESPONSIBLE FOR DETERMINING THE SUITABILITY OF THE TT-1 WIDE BAND CONTROLLER
Dynamic EFI warrants that
the TT-1 WB Controller (the hardware) will be free of defects for a
one year from the date of receipt. Remedy: Dynamic EFI's and its
suppliers' entire liability and your exclusive remedy shall be, (a)
return of the price paid (if any) for the Product, or (b) repair or
replacement of the Product, that does not meet this Limited Warranty.
There is no warranty provided on the sensor.
Dynamic EFI makes no warranties whatsoever, expressed or implied with
regard to the software provided with the TT-1 WB unit product.
The right to make changes in design, add to, or improve upon product
without incurring any obligations to change the same on products
previously manufactured is expressly reserved.
Buyer agrees to indemnity and hold seller harmless from any claim,
action or demand arising out of or incident to the buyer’s
installation or use of the TT-1 WB product.
The TT-1 WB product is protected by copyright and other
intellectual property laws and treaties. Dynamic EFI or its suppliers
own the title, copyright, and other intellectual property rights in the
TT-1 Wide Band (WB) controller is for users that require an accurate AFR
reading and an easy to use system. The TT-1 outputs may be used to interface with a data
logger, engine management unit, or an AFR gauge.
are two analog outputs from the TT-1 unit. These are both programmable
for the output voltage range (within 0 to 5 volts) and AFR/Lambda
Output A is dedicated as a WB output.
Output B can be either a simulated narrow band (NB) output or a WB output.
TT-1 WB utility program runs under WIN98, Win2000, XP, Vista and Windows 7. It
uses a USB interface to the TT-1 controller. This utility program is
used to set up the output voltage vs. AFR/Lambda ranges, update the
TT-1 firmware (if required), and has a AFR/LAMBDA display.
WB sensor gets very hot. Allow it to cool before attempting to remove
it from the exhaust. If powered up in free air be careful not to burn
yourself or to ignite any nearby combustibles (including vapors such as
from gasoline, propane, and so on).
Whenever the engine is running the WB sensor
is also required to be running. The sensor may be damaged when in the
exhaust of a running engine without being operated by the TT-1.
Along the same lines, do not run the WB sensor for more then a few minutes unless the engine is running.
sure to install the sensor with the tip facing a downward slope. This
is to prevent exhaust condensation from collecting inside of the
sensor. See the sensor mounting guidelines further along in this document.
Contents of TT-1 WB package:
Included with the TT-1 WB are the following:
The CD-ROM contains the USB drivers and documents along with the TT-1 WB Utility program (and this user manual).
- TT-1 WB unit
- Bosch WB Sensor
- Sensor mounting bung
- USB cable
Install the TT-1 inside of the vehicle. Do not install the TT-1 box under the hood or outside of the vehicle interior.
Wiring is as follows:
Red: Power, connect to an
ignition or accessory switched fused power source
Black: Heater ground, connect to engine block
Green System ground, connect to engine block.
May also be connected to the data logger ground point.*
Orange: Dedicated WB output, connect to data logger analog input
Purple: WB/NB output, this may be connected to
the ECM NB input to provide a simulated NB signal. May also be used as
a WB signal and connected to a gauge.
*Note that the heater ground and system ground are not
tied together within the TT-1 WB controller. This removes the
affects of the heater current from the WB outputs. It also means
that the grounding must be done correctly for proper results.
- Connect the TT-1 heater ground to the engine block. This will provide the best grounding for the WB sensor heater.
- The TT-1 system ground may be connected to the same point on the engine block.
- If the TT-1 system ground is connected to the data logger analog ground. The data logger analog ground must also be tied to the engine block.
- Avoid chassis ground points, and grounds from other places in the vehicle. Use the engine block for all ground connections within the engine control and logging equipment.
to use a single point (bolt or stud) on the engine block for grounds.
The use of anti-seize will help in preventing corrosion and provide a
good conductivity for the ground lugs.
Figure 1 above shows the basic wiring of the TT-1 WB controller.
figure 2 the ground wiring is shown with the TT-1 heater and system
grounds connected to the engine block. The data logger analog ground is
then connected to the same point on the engine block.
figure 3 the ground wiring is shown with the TT-1 heater and data
logger grounds connected to the engine block. The TT-1
system ground is
then connected to the data logger.
sensor mounting bung is provided. This may be welded into the exhaust
at a convenient location. Note that the WB sensor is sensitive to
excess heat and exhaust back pressure. It is recommended that the
sensor be mounted at least 3 feet from the engines exhaust ports.
welding the mounting bung it is recommenced to run a spark plug thread
chaser or tap through the threads (18 mm x 1.5 mm).
- Do not install the sensor in the exhaust manifold near the cylinder head (this is the stock NB location for some vehicles).
- Do not install the sensor between the exhaust ports and the inlet of a turbocharger.
- Do not install the sensor after a catalytic converter, always prior to one.
Tighten the sensor to between 30 and 40 foot-pounds of torque. Do not over tighten!
sensor cable must not come into contact with the exhaust system. Be
sure to tie off the cable to prevent contact with the exhaust system,
suspension, and so on. Do not let the cable hang down under the
vehicle. If it catches on road debris damage will ensue.
- Install the sensor with the tip facing a downward slope.
that the sensor may be mounted from the left, top or right side of the
pipe. Just be sure that it is installed with at least a 10 degree
downward facing angle.
USB Driver Installation:
TT-1 uses a USB interface for the purpose of set up, firmware updating,
and the AFR/Lambda display via the TT-1 WB Utility program. To do
this an FTDI USB driver is required. Your PC/laptop may already
have an FTDI driver installed. If so there is no need to reinstall
them, although an updated driver may be required.
USB drivers may be found on the supplied CD in the "USB Drivers & Instructions" folder.
There are detailed instructions for driver installation within
that folder (as PDF files).
The quick installation version is to:
- Boot up PC/laptop
- Insert TT-1 CD-ROM into drive
- Disconnect from the Internet (remove cable, shut down wireless card, etc.)
- Connect TT-1 to PC/laptop via the supplied USB cable
- Power up TT-1 WB unit (key-on,engine-off)
- A dialog pop-up will appear if a driver is not currently installed
- Click the "No, not at this time" radio button
- Next screen, click the "Install from a list or specific location (Advanced)" radio button
- Now point the dialog at the CD-ROM and navigate it until the driver file is found
Once completed the install dialog will appear again, take the same
steps as before. It is a two part install and is normal for the install
dialog to appear twice.
Connecting to the TT-1 via USB:
the drivers are installed you can connect to the TT-1 WB controller.
Using the supplied A/B USB cable connect one end to the TT-1 controller
and the other to your laptop.
For most of the Windows
operating systems the TT-1 WB Utility will automatically
connect to it. You may also select the "Find TT-1" entry under the File
drop down menu to initiate a search for the TT-1 controller.
WIN98, and sometimes (rarely) on one of the other USB capable
Windows O/S's the search does not work. In this case use the "Comm
Setup..." entry under the File drop down to define the proper COM port.
Click the "Fixed COM Port" radio button and in the adjacent drop list
select the proper COM port.
The easiest method to find which
port the TT-1 WB is using is with the Device Manager. Turn off the
power to the TT-1, open the "Ports (COM & LPT)" entry and note the
available COM ports.
Then power up the TT-1 and note which port then appears. That will be the proper COM port for the TT-1.
There are two LEDs on the TT-1 WB unit. One green and the other red. They are currently used as follows:
- Flashes once per second during initial sensor heating
- Flashes twice per second once sensor is nearing operating temperature
- Solid once the sensor is up to temperature and the TT-1 WB unit outputs proper readings
- Flickers during set up programming and firmware programming
the red LED illuminates at power up the TT-1 WB unit is in a
programming mode. In this case update the firmware via the TT-1 WB
Utility program. Then set the desired output channel voltages and AFR
via the set up display.
- Solid when in set up programming mode or firmware programming mode
The TT-1 WB unit has programmable outputs. As provided output channel A is programmed as follows:
Output channel B is programmed as:
- Stoich of 14.7:1 AFR
- Zero volts for 10:1 AFR
- Five volts for 20:1 AFR
- A medium filter response
change the output programming use the Windows TT-1 WB Utility provided on
the CD. This utility allows the user to change the range
of the analog outputs, update the TT-1 WB unit firmware, and has a
display of the current WB AFR and lambda.
- A simulated NB output. It is centered on stoich (lambda of 1).
Upon opening the TT-1 WB Utility program the set up screen is displayed:
A is the dedicated WB output. Channel B defaults to a simulated NB
output. It may also be used as a WB output by selecting the "WB" radio
The "Stoich AFR" entry defines the AFR for a lambda of 1.
The "Response" entry defines the level of filtering. The slower the response the smoother/slower the output.
The NB output can be offset from stoich. This may be used when running in closed loop for a richer or leaner AFR.
Channel A (and B when used as a WB output):
- The output voltage ranges from 0 volts to 5 volts, and may be set anywhere in between.
AFR ranges from 0 through 210. Although this is a little extreme, there
may be a case where the end values are desired. Note that an AFR of 207
is typically free air.
- Read TT-1, reads the current setup from the TT-1 WB unit and fills in the screen with those values
- Set Defaults, sets the screen to the factory default values
- Set TT-1, writes/programs the TT-1 WB unit with the current set up screen values
- The axis of the graphs are fixed. They will show 0 to 5 volts for a WB channel. And 0 to 1 volt for a NB channel
- The Lambda values are fixed from 0.68 to 1.32. This puts Lambda of 1 in the center of the lower axis
- The AFR scaling will auto scale according to the stoich AFR setting
- If an AFR value (vs. volts) falls outside of the graph range, the displayed slope of the line will be correct
bottom of the display has a blue status bar. It shows the name of the
program along with the port number and whether it is open or closed.
The TT-1 WB Utility will auto select the proper port once the TT-1 WB
unit is powered up. The port selection/opening logic may be reset by choosing the ALT-F, Find TT-1
menu selection. Note that from the time that power is applied to
the TT-1 it can take up to 6 seconds to open the port.
Example of changing the TT-1 set up:
an example lets change the stoich AFR in the TT-1 from 14.7 to 14.2. To
do this read the current set up from the TT-1, make the change, and
write the TT-1:
- Key-on, engine-off, wait for port to open
(see COMx on status bar), click the "Read TT-1" button. If no error
messages pop up the display will be updated with the current set up in
- Click on the "Stoich AFR" edit box and type in the desired stoich AFR (14.2).
the "Set TT-1" button. A progress bar will appear above the three
buttons. Once the TT-1 update has completed the progress bar
disappears. You can key-off or start the engine.
AFR & Lambda Display:
using the TT-1 WB unit on a chassis or engine dyno the AFR/Lambda
display may be utilized. This display is accessed via the Display,
AFR & Lambda menu key (ALT-D, A).
the TT-1 WB unit is powered up and the sensor heater up to temperature
the display will show the current AFR and lambda value. Note that the
displayed AFR is based on the stoich value programmed into the TT-1 WB
unit. As data arrives the spinner in the upper right will rotate.
are a few settings for the AFR/Lambda display in the Preferences dialog
(ALT-F, F). The range of the target area may be set. This can be seen
as the red area on the gauge between 0.86 and 0.88 Lambda.
The other setting is the response rate of the display. It is a filter to smooth the reported AFR & Lambda values.
few notes about AFR and Lambda: an O2 sensor (both WB and NB) read
Lambda. A Lambda of 1 is stoich for all fuels. However, the stoich AFR
will vary according to the fuel type. Looking at the above AFR &
Lambda display the AFR is being reported as 99.9, with a Lambda of one.
This is due to the display not yet receiving any data from the TT-1 WB.
display defaults to a lambda of one, but does not know what the stoich
AFR is supposed to be. That information is sent by the TT-1 WB unit
once it connects and starts to send data.
The AFR & Lambda
display receives the reported lambda value along with the stoich AFR
value that is programmed into the TT-1. Between the two the current AFR
is calculated and displayed.
This display is used to update the TT-1 WB unit firmware. The firmware is the instructions that run the TT-1 WB unit.
The firmware update display will auto-connect to the TT-1
WB unit. It will read the current firmware version and compare it to
the available firmware version.
- The TT-1 WB unit firmware version is shown in the "TT-1 Information" box
- The firmware version that may be programmed into the TT-1 WB unit is shown in the "New Firmware Information" box
You may then chose to do the update or stay with the present version.
typically takes 10 to 20 seconds to do the firmware update. During
update please leave the TT-1 and PC/laptop powered up along with
the USB cable plugged in. The progress bar will increment along with
showing "Programming...", "Verifying.. ", and "Done..." messages.
Please visit our website at: www.DynamicEFI.com
Document v 1.03, 1/2011
Copyright 2009 - 2011 Dynamic EFI,
All Rights Reserved.