I can't decide whether the car is traction limited when making that harsh noise. I can hear a distinct, momentary phase, when the throttle is initially picked up. That's around, or just after the apex when the engine briefly makes the more usual tone. A fraction of a second later, the harsh tone kicks in and lasts until out on the exit curbing
I suspect MGU-H is much more important than the MGU-K now.dren wrote: ↑17 Aug 2018, 18:36Yes, and more throttle due to increase in drag. Honda said it's partially what prompted them to come up with the extra harvest mode.Nonserviam85 wrote: ↑17 Aug 2018, 16:05What I also find interesting is how the deployment strategy changed after 2017 when the braking points became shorter due to the new aero regs.
The wastegate sound itself is also unique. It is smoother and more continuous than the Mercedes, which has a distinct and familiar exhaust note like you'd expect from a six-cylinder engine. "Brrrm." The SF71H is more of a "p-sheooo" sound; like a pressure vessel being vented, overlayed upon what is still a relatively quiet ICE exhaust note. Still the engine exhaust note is muted. The only sound that increases is the "p-sheooo." What may be the source of this?Red Rock Mutley wrote: ↑19 Aug 2018, 18:23I can't decide whether the car is traction limited when making that harsh noise. I can hear a distinct, momentary phase, when the throttle is initially picked up. That's around, or just after the apex when the engine briefly makes the more usual tone. A fraction of a second later, the harsh tone kicks in and lasts until out on the exit curbing
As regards harvesting the MGU-H was always going to be more important than the MGU-K, because the H is not limited in harvesting.Nonserviam85 wrote: ↑19 Aug 2018, 21:09I suspect MGU-H is much more important than the MGU-K now.dren wrote: ↑17 Aug 2018, 18:36Yes, and more throttle due to increase in drag. Honda said it's partially what prompted them to come up with the extra harvest mode.Nonserviam85 wrote: ↑17 Aug 2018, 16:05
What I also find interesting is how the deployment strategy changed after 2017 when the braking points became shorter due to the new aero regs.
Can it simply be an acoustic phenomenon? On the FP in Hockenheim when we've seen a "shotgun" exhausts, one of the pipes was simply an addon to another. I suspect this is still the case in the normal arrangement. So can it be that they somehow have acoustically tuned wastegate exhausts for some reason? This will provide frequency filtering and smoothing of the sound, so from "bang" you'd go to "sheeoooo".roon wrote: ↑20 Aug 2018, 06:59The wastegate sound itself is also unique. It is smoother and more continuous than the Mercedes, which has a distinct and familiar exhaust note like you'd expect from a six-cylinder engine. "Brrrm." The SF71H is more of a "p-sheooo" sound; like a pressure vessel being vented, overlayed upon what is still a relatively quiet ICE exhaust note. Still the exhaust note is muted. The only sound that increases is the "p-sheooo." What may be the source of this?Red Rock Mutley wrote: ↑19 Aug 2018, 18:23I can't decide whether the car is traction limited when making that harsh noise. I can hear a distinct, momentary phase, when the throttle is initially picked up. That's around, or just after the apex when the engine briefly makes the more usual tone. A fraction of a second later, the harsh tone kicks in and lasts until out on the exit curbing
The normal wastegate pipe arrangement seems to be a wye or wishbone shape branching from a single location, with two equal length pipes running alongside the main pipe. Visible in the photos below. The integration of the wastegate may also be worth considering. Seemingly it is built into the turbine scroll housing. However, there aren't really any rules defining what a wastegate is, or how it should be designed or arranged. They're free to put this variable-geometry device in an exhaust system that is not supposed to have variable geometry. Perhaps they're having fun with it.timbo wrote: ↑20 Aug 2018, 07:14Can it simply be an acoustic phenomenon? On the FP in Hockenheim when we've seen a "shotgun" exhausts, one of the pipes was simply an addon to another. I suspect this is still the case in the normal arrangement. So can it be that they somehow have acoustically tuned wastegate exhausts for some reason? This will provide frequency filtering and smoothing of the sound, so from "bang" you'd go to "sheeoooo".
This isn't correct. Renault, at least, have run a wastegate mounted on top of the turbine house.saviour stivala wrote: ↑20 Aug 2018, 09:08The formula 1 turbocharger is not a normal turbocharger.
The normal turbocharger will in most cases have the waste-gate build into the turbine scroll, the design aim of which is to control boost by relieving exhaust gases pressure inside the turbine scroll, in doing so it relieves pressure inside the turbine scroll by internally bypassing exhaust gases straight to turbine scroll exhaust outlet.
The formula 1 turbocharger waste-gate cannot be build into the turbine scroll because the design aim is not that of controlling the compressor boost but to bypass exhaust gases away from the turbine scroll relieving turbine scroll pressure so as the compressor can get to and maintain maximum boost by electric supercharging.
As do Ferrari,hurril wrote: ↑20 Aug 2018, 11:00This isn't correct. Renault, at least, have run a wastegate mounted on top of the turbine house.saviour stivala wrote: ↑20 Aug 2018, 09:08The formula 1 turbocharger is not a normal turbocharger.
The normal turbocharger will in most cases have the waste-gate build into the turbine scroll, the design aim of which is to control boost by relieving exhaust gases pressure inside the turbine scroll, in doing so it relieves pressure inside the turbine scroll by internally bypassing exhaust gases straight to turbine scroll exhaust outlet.
The formula 1 turbocharger waste-gate cannot be build into the turbine scroll because the design aim is not that of controlling the compressor boost but to bypass exhaust gases away from the turbine scroll relieving turbine scroll pressure so as the compressor can get to and maintain maximum boost by electric supercharging.
This is wrong. there is nothing in the regulations that say it can only generate when braking.saviour stivala wrote: ↑19 Aug 2018, 19:14(braking against throttle to harvest because only when brake pedal is used can the K go into harvest)
The MGU-K (where the ‘K’ stands for kinetic) converts kinetic energy under braking into electricity (rather than it escaping as heat).ian_s wrote: ↑20 Aug 2018, 12:27This is wrong. there is nothing in the regulations that say it can only generate when braking.saviour stivala wrote: ↑19 Aug 2018, 19:14(braking against throttle to harvest because only when brake pedal is used can the K go into harvest)