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 Post subject: The end of turbo lag...
PostPosted: Thu Oct 15, 2009 11:48 pm 
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I've never heard of such a thing at all, maybe cuz I'm a noob about turbos? From reading this, this could be the end of turbo lag :mrgreen: I've been doing a lot of research into turbos lately, including talking to a friend of mine with a turbo dodge neon.

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What is E-boosting and what are its prospects? E-boosting stands for electrical-assisted boosting; by incorporating a very high speed electrical motor in rotating assembly of a turbocharger, you can drive it up to very high speeds, before you have exhaust gases to do so. It is very powerful, specifically when there is no exhaust gas available, such as at idle, or in stop and go.

It is entirely integrated inside the turbocharger, with virtually “real-estate” penalty to speak of. The size of the electric motor is about an inch long. It makes the turbocharger an inch longer, with no impact on the timing and virtually no impact on the weight. The trick is to make electrical motors are capable of motoring more than 120,000 rpm and withstand mechanical loads in excess of 200,000 rpm – because turbos spin that fast.

The other challenge is to get enough electrical energy into their designs. The majority of cars use 12 volt or a 14-volt alternator.42 volt would be a significant help. But we believe that electric boost is feasible with 12-volt systems. The prospect is very real for electric boost. You will see it in premium diesels such as the Renault Aspach (sic) or the Peugeot A06 (in Europe). They have limited space and need lots of power density and bottom end. I also clearly see it in high-end gasoline engines, built for high performance.

I could imagine it in a (Chevrolet) Corvette or (Ford) Mustang Cobra like vehicle, having an electrical-assist turbo. If you go to 42 volt or a hybrid, e boosting would also allow very aggressive downsizing of the (IC) engine. This would allow very aggressive downsizing of the engine. Instead of applying a three-liter V6, you could apply a one-liter internal combustion engine, equipped with an electrical boost turbo plus an electric motor. You can only do extreme downsizing – 50 percent or more – with electrical assist turbocharging.


This is the article where I got the info:
http://www.acarplace.com/cars/turbochargers.html

where I first heard about it: *under turbo lag
http://en.wikipedia.org/wiki/Turbocharged

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PostPosted: Mon Oct 19, 2009 11:06 pm 
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Electrically spinning a turbo up is not going to be too cheap or too reliable.
Can you think of an electric motor that will withstand 1,800 degrees F?
VNT isn't be cheap either and involves computer control for the most part.
At least you G/P guys were smart enough to start with 4 bolt exhaust housings.
Interesting stuff though.

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PostPosted: Mon Oct 19, 2009 11:42 pm 
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yup, really interesting. I would have just ignored it, but it's from a reputable company.

I'm thinking it'll have to be a chain hooked up to the turbo and the motor- away from the heat.

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PostPosted: Tue Oct 20, 2009 12:38 am 
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withstanding the heat would not be a major issue....designing the integration into the turbo however slightly more challenging. an external drive system would be plausible however not very space efficient considering the location of some turbos. now as for the downsizing of the engines to run such applications that would be a much better way of applying these turbos. but why go with a smaller engine? go big or stay at home hahaha

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PostPosted: Tue Oct 20, 2009 1:11 am 
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I posted this on SSP's forum too. Here is what one of my friends had to say...

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As far as the elec motor is concerned, I can only imagine what the heat that is generated around the turbo will do to it! Probably have a life span of 2 hours... Also, the voltage isn't nearly as important as the amperage that the alternator will be putting out. I'm sure to spin that turbo to that speed will require quite a bit, further putting resistance on the engine....not sure if that'll be worth it. Not to mention the fact that now you are sucking exhaust from the cylinders / valves...which might cause turbulence and other issues that we may not be aware of. Even vacuum issues on the exhaust side. Imagine that if you have a cam that has a slight overlap, that the scavenging effect will be increased due to the fact that now the exhaust is being sucked out by the turbo, instead of the exhaust spinning the turbo. Now the good fuel/air will go straight thru the chambers instead of staying inside to combust.

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PostPosted: Wed Oct 21, 2009 2:22 am 
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Or just anti-lag the crap out of your tuning. That works too and makes pretty fire. An electric motor would be interesting, but making it work with the mechanical turbo would be a challenge, but should be possible.

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