[westphone]

Just one, how can they squeeze out that much power while claiming little to no turbo lag. Anyone has insights on this? BMW M CEO guy said he can cook up 185 hp to 200 hp with no problem, and he is not at the limit yet.

I remember seeing parts of an old film the F1 car goes to 1.5 bar, but A45 has already gone to 1.8 bar, but I guess that really isn't an issue for them anymore. I guess everyone knows if Subaru builds such a car, the turbo lag would be epic, but Merc and BMW seems to have different ideas.

Thanks

[SteveC]

Hi there,

The regulatory drive towards lower emissions and higher fuel economy has lead to some major advances in turbocharger design since F1 last used the devices.

If you search Twin Scroll Turbos and Hybrid Turbo Charger Technology (electric motor driven turbos) you will already find several strategies for mitigating turbo-lag.

Essentially Twin Scroll Turbos divide cylinder exhaust gas pulses to avoid interference and ensure more efficient exhaust scavenging and cylinder loading, while Hybrids add a compact permanent magnet motor to accelerate the turbo to full speed in the absence of sufficient exhaust gas flow and pressure. This allows for more accurate fueling and gives the ECU very precise control over boost pressure.

[ttimbo]

I think an equally important factor is the mating of these engines with closely coupled dual clutch transmissions, where the engine ECU and the TCU work to cover any sense of lag.

[ovekvam]

Our 116i has a very small twin scroll turbo, but there is still very noticeable lag. Not as bad as a the 2002 Turbo from the seventies, though! :-)

I think many journalists would not sense turbo lag if they sat on top of it. I have seen lots of rave reviews of cars that are supposed to have no lag, yet when I put the throttle down in the same car, I have to wait for the boost.

[westphone]

Originally Posted by ttimbo

I think an equally important factor is the mating of these engines with closely coupled dual clutch transmissions, where the engine ECU and the TCU work to cover any sense of lag.

Thanks guys. I was thinking some beast of burden on/off pure mechanical motor/device as anti-lag .... Alright I am from such an era, but it is always very cool to see technology advance

Thanks again gents

[westphone]

Originally Posted by SteveC

Hi there,

The regulatory drive towards lower emissions and higher fuel economy has lead to some major advances in turbocharger design since F1 last used the devices.

If you search Twin Scroll Turbos and Hybrid Turbo Charger Technology (electric motor driven turbos) you will already find several strategies for mitigating turbo-lag.

Essentially Twin Scroll Turbos divide cylinder exhaust gas pulses to avoid interference and ensure more efficient exhaust scavenging and cylinder loading, while Hybrids add a compact permanent magnet motor to accelerate the turbo to full speed in the absence of sufficient exhaust gas flow and pressure. This allows for more accurate fueling and gives the ECU very precise control over boost pressure.

Did the search and try to understand what I could. It's good readin', thanks.