Ford Fiesta 1.0L triple to get cylinder deactivation

[MetroMPG]

Originally Posted by Baltothewolf

Just stay out of boost. It's not that hard ... FOR A HYPERMILER.

Fixed that for you!

With most turbo owners, you often hear/read the words "addictive" and "boost" in close proximity.

Smiles per gallon, baby!

[Baltothewolf]

I agree, which is why everyone was reporting 34-38 while I was getting 45. I can't say I didn't stretch the turbo's legs getting on the freeway (would routinely see 8-10lbs), but I didn't do it just to 'feel' it.

[gone-ot]

Originally Posted by Baltothewolf

I...I don't think you know how boost works x3.

Oh, I know exactly how a turbocharger works, our 2011 Cruze had one. Specifically, I was thinking about an electro-magnetic "clutch" to disengage the exhaust turbine (drive side) from the air-inlet turbine (driven side) would work just fine.

[Baltothewolf]

Originally Posted by Old Tele man

Oh, I know exactly how a turbocharger works, our 2011 Cruze had one. Specifically, I was thinking about an electro-magnetic "clutch" to disengage the exhaust turbine (drive side) from the air-inlet turbine (driven side) would work just fine.

Would be more feasibly done on a supercharger, Toyota has done it. On a turbo, I would think the friction material would overheat because of the exhaust gas

[gone-ot]

Originally Posted by Baltothewolf

Would be more feasibly done on a supercharger, Toyota has done it. On a turbo, I would think the friction material would overheat because of the exhaust gas

Think "ferro-magnetic" oil clutching (ala' struts/shocks).

[Baltothewolf]

Yea but on a turbo, why? If you want to be in boost, you are in boost, if not, it's not hard to stay out of it. Doesn't matter if the turbine is engaged or not, the restriction still exists.

On a supercharger it's different because you can eliminate the parasitic draw from spinning it when it's not needed. And only engage the clutch when extra power is needed.

[oldtamiyaphile]

Maybe with an 80's car you can stay out of boost, but you can't do that with modern VGT/ Twin Turbo designs that boost from just over idle. All you can do to keep off boost is accelerate like a granny.

The lowered CR of a factory turbo makes off boost running slow and not that efficient either. My R32 Skyline gets beaten by every granny if I launch at idle and by the time boost builds, we've hit the speed limit, with granny still in the lead.

One solution would be Infinity's variable CR engine, or just add an electric supercharger to a standard NA unit, it wouldn't produce the peak power of an engine designed for forced induction, but would be enough for our interests.

[cRiPpLe_rOoStEr]

Either some turbo bypass or anticipating the opening of the wastegate seem possible, but I'm not sure if that would be effective. Anyway, with the widespread of direct injection in the recent turbocharged gassers, lean-burn wouldn't be so much of a problem.

[Baltothewolf]

Originally Posted by oldtamiyaphile

Maybe with an 80's car you can stay out of boost, but you can't do that with modern VGT/ Twin Turbo designs that boost from just over idle. All you can do to keep off boost is accelerate like a granny.

The lowered CR of a factory turbo makes off boost running slow and not that efficient either. My R32 Skyline gets beaten by every granny if I launch at idle and by the time boost builds, we've hit the speed limit, with granny still in the lead.

One solution would be Infinity's variable CR engine, or just add an electric supercharger to a standard NA unit, it wouldn't produce the peak power of an engine designed for forced induction, but would be enough for our interests.

In my 2016 civic, wasn't hard to stay off boost at all, and I could get boost at 1500rpm the turbo was so small.

[oldtamiyaphile]

Well, what's your definition of 'boost'? I noted that at a steady 25mph at~1100rpm my Renault is already making about 4psi.