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by Jonny Lieberman (RSS feed) on Mar 2nd 2010 at 12:29PM Geneva Motor Show
Hispano-Suiza - click above for high-res image gallery
Before World War II there were several high-end European luxury marquees that sadly didn't survive long past the Great Depression. One of these makes was Hispano-Suiza, and the car world was worse off as a result. Check out the V12-engined Hispason-Suizas built in the 1930s if you're a non-believer. But guess what? As we mentioned previously, Hispano Suiza is back, only they've dropped the hyphen from their name and the V12 in favor of an Audi V10.
That's right, an Audi V10, which is actually a Lamborghini V10, and Lambo is owned by Volkswagen. But forget all that. The new Hispano Suiza (there's no model name) is essentially a rebodied aluminum, magnesium and carbon fiber Audi R8 V10 5.2 FSI, only they've plugged two electric-superchargers into the intake manifold. As a result, power is up through the roof, improving upon the R8 V10's 525 hp by 225 ponies for a total of 750 horsepower. As you may have guessed, performance is also way up, with 60 mph happening in 3.3 seconds (up from 4.5 in the R8) and a top speed of 211 miles per hour (196 mph in the Audi), propelling the new 3,505-lb Hispano Suiza squarely into hypercar territory.
The reborn Hispano Suiza company plans to build between 20 and 25 of their new cars per year. Our take? Good luck. The one stat we haven't mentioned yet is that they'll be selling these puppies for a cool €700,000. That's about $950,000 at the current exchange rate. Frankly, that's a ludicrous amount of money for a vehicle that just doesn't do much for us. For that lofty price tag, you'd think they could at least give the poor car a name.
Looks like there is an electric engine on each supercharger and that the alternator and battery power the superchargers... I may be pointing out the obvious though... Interesting concept!
Well, I think that's kind of point out the obvious. The factor is going to be load on the electrical system and how they managed it. Your not going to power that as simply as the alternator and the battery. It'd have to be one heck of an alternator. There's more to the system than that I'm sure. Those motors are likely a/c and use some type of regeneration system to charge and use a bank of batteries to hold power...that'd by my guess.
It all depends on how much boost you need and for how long. A car battery can deliver over 10 HP for a short duration (< 30 seconds). Recharging would take some time and you wouldn't want to deeply discharge the battery too frequently, but it might be something you could use in short bursts -- sort of like nitrous.
Assume maybe 9 V output while delivering 1000 A. 9 V * 1000 A = 9000 W. 9000 W = 12 HP.
The next question is how much flywheel power you could get if you had a supercharger supplied with 12 HP at the shaft. That's a bit more complicated than normal because the full 12 HP is delivered instantly irrespective of engine speed, unlike a belt driven supercharger. In that sense an electric supercharger is more like a fixed nitrous shot.
Assume maybe 9 V output while delivering 1000 A. 9 V * 1000 A = 9000 W. 9000 W = 12 HP.
The next question is how much flywheel power you could get if you had a supercharger supplied with 12 HP at the shaft. That's a bit more complicated than normal because the full 12 HP is delivered instantly irrespective of engine speed, unlike a belt driven supercharger. In that sense an electric supercharger is more like a fixed nitrous shot.
Problem is that is considering no energy loss due to friction, heat, etc...
A supercharger consumes 30hp for every 100hp it creates. Assuming an electric is slightly more efficient, you could say maybe 20hp would be needed to gain 100hp. That would be a huge electrical draw that a 100A alternator would have a hard time keeping up with. (and the motor cables would be huge). More likely that they would use a higher voltage to keep the current down using a bank of batteries as was suggested. Cant imagine what the advantage would be using electric.
I didn't think roughly 10 HP at the shaft of a SC would be enough to do much -- 50 HP flywheel maybe. There are two of them on the Hispano Suiza but to get approx. 200 flywheel HP would require at least 20 shaft HP at each SC. That in turn would require about 2800 A at 12 V. That is certainly not possible with one car battery, and any electric motor making that much power would almost certainly run at more than 12 V. I would expect that four batteries would easily be able to add 200 HP for more than 30 seconds. Keep in mind no one is expecting the alternator to provide all the juice for the electric motors. It's role would be to recharge the batteries.
As drjimmy pointed out that is a lot of work (and weight) for 200 HP. Why not just drive it off a belt?
I didn't think roughly 10 HP at the shaft of a SC would be enough to do much -- 50 HP flywheel maybe. There are two of them on the Hispano Suiza but to get approx. 200 flywheel HP would require at least 20 shaft HP at each SC. That in turn would require about 2800 A at 12 V. That is certainly not possible with one car battery, and any electric motor making that much power would almost certainly run at more than 12 V. I would expect that four batteries would easily be able to add 200 HP for more than 30 seconds. Keep in mind no one is expecting the alternator to provide all the juice for the electric motors. It's role would be to recharge the batteries.
As drjimmy pointed out that is a lot of work (and weight) for 200 HP. Why not just drive it off a belt?