Hi Taurim - ACE tells us the velocity stack helps intake at wide open throttle.
I'll be installing an AutoTune on mine. Is that your AutoTune mounted at the end of the header pipe near the union with the muffler? Dynojet support document shows the AT sensor within a few inches of the exhaust port. I haven't mounted mine yet.
BG
"If your exhaust has an o2 bung (18mm x 1.5), go ahead and screw the included Wideband Oxygen Sensor into this location. If you have to drill a hole for a new bung (mild steel bung included), we recommend doing so before the catalytic converter (if applicable)."
A wideband sensor is more fragile than a stock O2 sensor. Especially the one used with the Dynojet Autotune module which is a first generation Bosch LSU 4.2.
MOTEC installation instructions about this sensor for a car :
https://www.motec.com.au/filedownload.php/?docid=3524All the instructions are not easy to follow for a bike !
- Place the sensor at least 1 meter from the exhaust ports to avoid excessive heat (recommended).
- Place the sensor at least 1 meter from the open end of the exhaust system to avoid incorrect readings due to outside oxygen (recommended).
- Place the sensor away from the flame front coming out of the cylinder head and away from areas where one cylinder may have more effect than another.
- If possible, do not place the sensor near exhaust slip joints; some designs allow air to enter resulting in incorrect readings.
...
Sensor LifetimeSensor lifetimes are highly dependent on application for example the type of fuel used and the volume of gas flow over the sensor.
Some factors that reduce sensor lifetime are:
...
- Incorrect placement in the exhaust that can overheat the sensor
You can also find some informations here :
https://www.wbo2.com/lsu/LsuInstal.pdfThat's the reason why I installed it where it is : no too close from the head.
I'm not using an open end muffler but a muffler with a dB Killer.
The sensor is installed before the joint between the header and the muffler.
The M18x1.5 inox bung is welded with the correct angle (10° min away from horizontal, 15° min away from vertical) and not too much protrusion of the sensor in the tube (aprox 12mm).
You can see it behind the front of the brake pedal.
A welder custom modified my H's inox header to include a bend to have the muffler in the correct position and weld the bung in this portion.
(bung not welded yet)