First, engine braking. Came across this last week, the guy does some good vids and worth a browse, and layman’s terms sounds sensible..
Yeah, he’s ok this fella. I’ll watch it tomorrow. I’m currently laid in bed and I’ve left the AirPods downstairs. If I put the volume up my Mrs will punch me I use engine braking all the time. Front end always feels planted when rolled off and turns tighter.
I don’t mind that guy tbf. I’ve never known engine braking be an issue. it’s pretty useful for running engines in IMO. But as a caveat to that, in fast track or race scenarios where you’re dumping down the gears at very high revs, that naturally will put more strain on an engine Ofcourse. especially if you’re moto2’ing it backing it in to bends bouncing the poor thing off the limiter and locking the rear. I’ve seen cranks let go from that.
As Derek says ^^^ With a mechanical slipper, the only thing possible is to not shut the butterflies completely on the overrun; i.e. a temporary false high idle...
Yes, but but the RBW system can shut off the fuel completely on the overrun, unlike a carburetor or conventional injection which will still be feeding in fuel corresponding to how far the butterflies are open.
Most manufacturers run them up on the dyno before they’re sent off to dealers anyway. i recall a Ducati factory visit and seeing panigale’s being run up to the point the back cylinder pipe was glowing red haha I think it’s safe to say that it’s run in by that point and pissing about like miss daisy for a 1000 miles might be a bit of a waste ..
I have never ‘nannied’ an engine during the running in period, I just don’t go full banzai during this period just sensibleish revs.
In simple terms The engine braking map, is triggered when sensors (TPS) detect that the throttle has been has been closed. The ECU then adjusts the map according to the pressure on the rear brake, the extension of the suspension, and the lean angle, using this data, the grip of the rear wheel is calculated and a series of actions take place to reduce/increase the effect of engine braking, the throttle butterflies modulate to let air in and minimize the effect of the manifold vacuum, and some fuel may even be squirted in to generate a small engine load, open the throttle and the map switches off
So shut throttle and the electronics essentially add fuel as if the gas is still partially open? Hence Rae (think Haslam had same issues) used to complain about being pushed into corners when the bike wasn’t working well?
