"Wobbles the Mind" (wobblesthemind)
05/16/2016 at 20:21 • Filed to: Questions
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"Wobbles the Mind" (wobblesthemind)
05/16/2016 at 20:21 • Filed to: Questions | 1
| 9 |
If a car turns off a bank of cylinders, can you pretty much cut all the specs in half too? Like does the 503hp, 2.9T V6 in the Giulia QV essentially become a 252hp, 1.5T I3 cylinder? Theoretically if it were able to use the entire power band obviously.
MLGCarGuy
> Wobbles the Mind
05/16/2016 at 20:27 |
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Yes and no. For example, the C7 Corvette becomes a 3.1L V4 when the other 4 cylinders are deactivated. However, I’m pretty sure that the power is not halved, because if you were to go full throttle when the cylinders are deactivated, they would fire back up, so you’d get the full V8 power back.
Svend
> Wobbles the Mind
05/16/2016 at 20:29 |
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I don’t think so (I could be wrong) but isn’t your bhp calculated at a full throttle point (not max but on a curve) and as the deactivation is on RPMs or throttle response I doubt it would it. The engine will still be a 2.9T V6.
Mine’s a 1.4TSi ACT Superb Mk3 and it’s ideal.
e36Jeff now drives a ZHP
> Wobbles the Mind
05/16/2016 at 20:41 |
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It wouldn’t be exactly in half, because you have the power of a turbo 1.5 I3 but the friction of a 2.9 V6. I’d guess in a theortical world where you could go full throttle without turning off cylinder deactivation you’d get around 45% of full power
Die-Trying
> Wobbles the Mind
05/16/2016 at 20:50 |
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not quite half.... a bit less in fact. you still have the drag of all the moving parts that are now no longer making power. so instead of say 503 hp, now you are making somewhere around 230,225ish.
gmporschenut also a fan of hondas
> Wobbles the Mind
05/16/2016 at 20:55 |
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at a steady 65 mph a ferrari 360 only needs @30hp to maintain speed. its the beauty of cvt in that the engine can slow down with the transmission taking up the slack to match the revs and speed.
For cylinder deactivation its my understanding its mostly only during steady cruising or coasting, when the additional power (gas and air burning)aren’t necessary.
also max power is only at 5k+rpm. In the alfas case it is probably only putting out 1/4 of that 500hp.
I think cylinders are usually hut off on pairs.
Blunion05 drives a pink S2000 (USER WAS BANNED FOR THIS POST)
> MLGCarGuy
05/16/2016 at 21:05 |
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That’s not what he means though. Imagine if you reconstructed half the engine, and it functioned, what would its power specs be?
GE90man
> Wobbles the Mind
05/16/2016 at 22:19 |
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mind=blown
BiTurbo228 - Dr Frankenstein of Spitfires
> Wobbles the Mind
05/17/2016 at 04:53 |
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Not really on the halved bhp front. The power provided by the active cylinders would be the same, but it'd have the pumping and frictional losses of the larger engine. It'd definitely be less.
brianbrannon
> Wobbles the Mind
05/17/2016 at 11:03 |
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No because it’s spinning a 6 cylinder engine with only three cylinders so lots of internal losses