Fuelling - What exactly is in the euro 4 regs?
Discussion
I read quite a lot of bike magazines. Seems quite a common complaint that the fuelling (especially at low revs/speeds) on new bikes is poor, but that this is unavoidable due to euro 4.
I was curious if anyone knows precisely what it is about euro 4 regs that mean this is the case? Do let it enforce a maximum flow rate of fuel per 1000 revs or something, which starves the engine at lower revs?
I was curious if anyone knows precisely what it is about euro 4 regs that mean this is the case? Do let it enforce a maximum flow rate of fuel per 1000 revs or something, which starves the engine at lower revs?
spookly said:
Look at a fuel map for a Euro 4 bike.... often have a big chunk out of an otherwise smooth line/curve.. and often right about where you'd ride it at low speed in towns. That missing chunk is mainly there to meet noise and emissions tests which also funnily enough are tested at around the same revs.
On many bikes it can cause a snatchy throttle response at low speeds. Aftermarket can and map sorts it, or just remap yourself to remove the missing chunk of the otherwise smooth fuel map.
this is what I love about PH - geeky question asked; community answers! - thanks much for your response. On many bikes it can cause a snatchy throttle response at low speeds. Aftermarket can and map sorts it, or just remap yourself to remove the missing chunk of the otherwise smooth fuel map.
Gassing Station | Biker Banter | Top of Page | What's New | My Stuff