BOV exiting into the sidepods.

[Zynerji]

Could a team on a qualifying lap run the system where the BOV is directly integrated into the Air/Air intercoolers in the side-pods, and use it to form a counter-flow bubble that would block the incoming air, and reduce drag on the straights.
It would be driven by the MGU-H overboosting the turbo on purpose just to cause the BOV to open at certain speeds.

Obviously, it would restrict cooling, but on a single qualifying lap, I feel it could be done.

Thoughts?

[MtthsMlw]

Would air blocked in front of the sidepods really reduce drag?

Also:
5.8.2 Engine exhaust systems must have only a single turbine tailpipe exit and either one or two wastegate tailpipe exits which must all be rearward facing and through which all exhaust gases must pass. All and only the turbine exit exhaust gases must pass through the turbine tailpipe and all and only the wastegate exhaust gases must pass through the wastegate tailpipe(s). None of the tailpipes may be contained within any of the other tailpipes.

[Zynerji]

Would air blocked in front of the sidepods really reduce drag?

Also:
5.8.2 Engine exhaust systems must have only a single turbine tailpipe exit and either one or two wastegate tailpipe exits which must all be rearward facing and through which all exhaust gases must pass. All and only the turbine exit exhaust gases must pass through the turbine tailpipe and all and only the wastegate exhaust gases must pass through the wastegate tailpipe(s). None of the tailpipes may be contained within any of the other tailpipes.

I would expect it would reduce drag by removing the duct losses from the sidepods, and 5.8.2 doesn't apply here, as you quoted the exhaust side, and I'm speaking of the compressor side.

Blow off Valve = Intake
Wastegate = Exhaust

[henry]

It’s 5.8.1 that’s relevant here. All air entering the compressor must exit through the exhaust. BOVs must return the air to the compressor to be reinvested. Arguably even that is illegal but it seems to be allowed.

5.8.1 With the exception of incidental leakage through joints (either into or out of the system) and power unit breather fluids, all and only the fluids entering the compressor inlet and fuel injectors must exit from the engine exhaust system.

[Zynerji]

It’s 5.8.1 that’s relevant here. All air entering the compressor must exit through the exhaust. BOVs must return the air to the compressor to be reinvested. Arguably even that is illegal but it seems to be allowed.

5.8.1 With the exception of incidental leakage through joints (either into or out of the system) and power unit breather fluids, all and only the fluids entering the compressor inlet and fuel injectors must exit from the engine exhaust system.

Great! Thank you!

[Zynerji]

It’s 5.8.1 that’s relevant here. All air entering the compressor must exit through the exhaust. BOVs must return the air to the compressor to be reinvested. Arguably even that is illegal but it seems to be allowed.

5.8.1 With the exception of incidental leakage through joints (either into or out of the system) and power unit breather fluids, all and only the fluids entering the compressor inlet and fuel injectors must exit from the engine exhaust system.

Does that mean the BoV dumps directly into the exhaust currently? That seems very odd as most are just vented directly out of the housing...

[Dr. Acula]

It’s 5.8.1 that’s relevant here. All air entering the compressor must exit through the exhaust. BOVs must return the air to the compressor to be reinvested. Arguably even that is illegal but it seems to be allowed.

5.8.1 With the exception of incidental leakage through joints (either into or out of the system) and power unit breather fluids, all and only the fluids entering the compressor inlet and fuel injectors must exit from the engine exhaust system.

Does that mean the BoV dumps directly into the exhaust currently? That seems very odd as most are just vented directly out of the housing...

No, they recirculate back into the intake in front of the compressor. It's actually not what you would technically call a "Blow off valve", but a "compressor bypass valve" which is also what you find today in almost any turbocharged production car.

[Maritimer]

Blown off valves are only a thing on modified cars these days, recirculation valves are what you find on anything OEM since the 80s. Just sends the extra charge air back to the front of the compressor to keep boost up.

[Zynerji]

Thank you for that info!