Finally managed to get my bike to the test bench!!
Did 4 passes - 2 with the bike standard and 2 with K&N pod filters on the air intakes.
The graph below shows the best of each.
The bold red line is with the pod filters on.
What can be seen is that with the filters:
- There is a bit more torque between 2800 and 3600 rpm (about 0.4 kg-m max)
- There is less torque between 4600 and 5200 rpm (about 0.8 kg-m max)
- There is less torque between 5600 and 7000 rpm (about 0.5 kg-m max)
- Torque is then higher until the rev limit near 8200 tpm
In short it is a bit more torquey in lower revs and less so in higher revs apart from the very top.
With regards to power, there is a gain of about 5 hp at the top and a loss of about the same at the same rpms where the torque is lower.
Note that the hp number is given at the wheel (as opposed to the crank).
Finally, you can also see the air to fuel ratio which is vert similar in both cases, the bike running actually a little less lean in really low rpms - contrary to what I would have thought.
I rode there (about 30km of city streets and highway) in standard and returned with the filters on. 60km total.
The but bench - as some call it - did not detect much difference if any apart from indeed a lower engine break when you release the throttle. I wondered before trying it whether I would like it and actually I do.
The only thing I was a bit surprised with (and did not like) was that when I got back into the city and stopped at traffic lights I smelt and saw some smoke coming out of the filters (a little). Not sure if it smelt like burnt oil or escape gases but it was a clear difference with the normal air intakes.
I wonder if it is because it just got out of service and they have filled it with quite a bit of oil?! Although there should not be oil there, no?
Did I read it right? What do the experts think?
Thanks for the comments.