| Home | Teams powered by Hutter | Info | Shirts & Stuff | News | Chassis Dyno |
| Links | Trevor's TA | 1984 Camaro Z28 | 1998 Camaro Z28 |
| Matt's Image Archive | Contact |
- Hutter Performance Center now sells -
WEGO II Wide-band AFR (Air/Fuel
Ratio)
Metering System with Data Logging
Sale - Website Special $375 - GREAT DEAL! LOW PRICE!
O2 Weld Fitting - $12.95 (for o2 Sensor)
o2 Plug - $5.50 (for o2 Sensor)
EASY INSTALLATION! Fast Delivery!
Email to order or call 440-285-8467
Complete air/fuel ratio metering system with built-in data logging. Includes WEGO II Wide-Band Exhaust Gas Oxygen Sensor Interface, wide-band oxygen sensor, 18x1.5mm weld nut for mounting sensor on exhaust pipe, and software on CDROM - Super cool mountable LCD SCREEN! Put it in your dash - it looks high tech, giving a precise measurement of your air / fuel ration - way better than cheesy dial - LCD Screen is highly visible! A great way to make your ride stand out from the crowd!
· Versatile tuning aid for all carbureted and fuel injected engines displays AFR (air/fuel ratio) and logs over 2 hours data including AFR, engine RPM, and a spare 0-5V analog input for sensors such as throttle position or manifold pressure
· Can be used for on-road or dyno testing
· Suitable for automotive, motorcycle, and other small engine applications
· Highly accurate with less than 0.15 AFR error over 10.3 - 19.5 AFR range
· Easy free-air calibration procedure corrects for sensor aging effects
·
0-5V analog AFR output compatible with Twin Tec TCFI fuel injection system for
closed loop AFR control
· Red LCD display with backlight provides great readability in all conditions ranging from bright sunlight to total darkness
· Wide supply voltage range from11-18V allows operation from battery on small engines and race vehicles without an alternator. Current drain is approx. 1 amp
· Compact size: 3.7"L x 1.7"W x0.75"H
|
|
||||||||||||||||||
|
|
||||||||||||||||||
|
|
||||||||||||||||||
|
|
|||||||||||||||||||
Here's some additional information on the
WEGO II Wide-band Exhaust Gas Oxygen Sensor System
What kind of engines can I tune with the WEGO II?
The WEGO II system can be used to tune most four stroke gasoline powered internal combustion engines:
· Harley-Davidson and other motorcycles with carbureted or fuel injected engines. P/N WEGO2-SYS is intended for motorcycle applications. The WEGO II is an ideal tuning aid, either for on-road or dyno tuning. Knowing the exact air/fuel ratio greatly simplifies the task of carburetor jetting.
· Automotive applications. P/N WEGO2-SYS-A has an extended length harness. If you prefer a round gauge type display, P/N WEGO2-SYS-NB does not include the built-in LCD display and is intended to drive an Auto Meter® AFR monitor gauge.
Please note that the WEGO II cannot be used with two stroke or marine engines where oil or water vapor in the exhaust would cause serious problems with the sensor.
Can I use the WEGO II in place of an exhaust sniffer when dyno tuning?
Regardless of what some people may claim, it is impossible to properly tune a fuel injection system or carburetor on a modified engine without some means of exhaust gas analysis. Shops can use the WEGO II in place of an expensive exhaust gas sniffer. The only disadvantage is that a weld nut must be installed for the wide-band sensor.
What AFR values are optimum when tuning an engine?
Higher AFR values correspond to a leaner (less fuel) condition. The practical operating range for most engines using gasoline fuel is from approximately 11.5 to 14.7 AFR. Combustion of a stoichiometric mixture (exactly enough air to burn all the fuel) results in 14.7 AFR indication. Automotive engines with catalytic converters operate near 14.7 AFR during cruise and idle. Air-cooled motorcycle and automotive race engines require a richer mixture to limit cylinder head temperature and prevent detonation. The table below lists recommended AFR values for engines without emission controls.
|
Operating Mode |
Recommended AFR |
|
Cold Start (first 30 sec) |
11.5-12.5 |
|
Idle |
12.8-13.5 |
|
Part Throttle Cruise |
13.0-14.0 |
|
Wide Open Throttle |
12.5-12.8 (values down to 11.5 may be used to reduce detonation) |
Can the exhaust system affect wide-band AFR readings?
Wide-band systems will give inaccurate AFR readings in certain situations:
· Excessive exhaust back pressure. Wide-band sensors are affected by back pressure. Excessive back pressure causes exaggerated AFR indications under rich and lean conditions, but has little effect at 14.7 AFR (stoichiometric). The WEGO II is intended to be used with a free flowing performance exhaust. Overly restrictive stock mufflers may cause excessive back pressure under wide open throttle. When used with a turbo system, the sensor must be mounted downstream of the turbo. Motorcycle exhaust systems are relatively free flowing and problems with exhaust back pressure are not likely.
· Exhaust reversion. Reversion is the term for a negative pressure wave that can suck ambient air back into the exhaust and cause an erroneous lean AFR indication. Exhausts without mufflers, such as open headers or "drag pipes" on motorcycles, usually suffer from reversion effects and may not be suitable for use with the WEGO II. Reversion effects will also occur with certain exhausts used on "bagger" style motorcycles, where two pipes split off near the rear cylinder. At part throttle, air is actually sucked into the left tailpipe. You will have to block off the left pipe. Reversion effects will be most noticeable at idle, part throttle low RPM cruise, and decel.
· Excessive scavenging. Turbo systems or tuned exhausts in combination with a high overlap camshaft profile can force unburned air and fuel mixture through the cylinder into the exhaust and cause an erroneous rich AFR indication. For motorcycles, some aftermarket 2:1 systems such as the Thunderheader appear to suffer from this problem, whereas others such as the Vance & Hines Pro Pipe and White Brothers E-series seem less affected.
What is the difference between a wide-band and conventional exhaust gas oxygen sensor?
Conventional (narrow-band) exhaust gas oxygen sensors have been widely used in automotive applications since 1981. Conventional sensors have one to four wires and can only sense air/fuel ratio over a relatively narrow 14.5 to 15.0 range. They are intended to be used with 3-way catalytic converters that require operation near the stoichiometric point (14.7 air/fuel ratio). The range of narrow-band sensors is inadequate for performance tuning. While originally developed for lab and specialized automotive applications, wide-band sensors are ideal for tuning. The 5-wire Bosch LSU 4.2 sensor used with the WEGO II operates over a range of 10.3 to infinite air/fuel ratio
What are the limitations of the wide-band sensor?
The sensor will be quickly degraded if leaded racing gasoline is used. Under these conditions, expected sensor life will be less than 10 hours. As the sensor degrades, free air calibration will become impossible.
Oil or other hydrocarbon residues in the exhaust will affect the sensor readings. Likewise, gasoline containing ethanol will result is slight air/fuel reading errors.
The sensor responds to the partial pressure of oxygen. Excessive exhaust back pressure will affect sensor readings. This should not be a problem with any performance exhaust system. When used with a turbo, make sure the sensor is located downstream of the turbo.
Make sure that power is on to the WEGO II whenever the engine is run. Without power to the internal heating element, the sensor will clog with hydrocarbon residues and may be permanently degraded.
 |
 |
| WEGO II with LCD Display |
Wideband Oxygen Sensor
|
|
