928 Electric at Laguna Seca
09-03-2009, 05:18 PM
#31
Race Director
Jeff
Right on....great video...very well made & clearly your 928 was the star of the show, they kept showing it over and over...but the paint sure is cool too..
I got to ride in Jeff's machine a while back when he had the 3400lb lead acid batteries....the performance was surprising to say the least...off the line he had no problem spinning those little tires and its acceleration was easily enough to keep up with traffic....it has to be much better now...heres some pics I have of his machine
Right on....great video...very well made & clearly your 928 was the star of the show, they kept showing it over and over...but the paint sure is cool too..
I got to ride in Jeff's machine a while back when he had the 3400lb lead acid batteries....the performance was surprising to say the least...off the line he had no problem spinning those little tires and its acceleration was easily enough to keep up with traffic....it has to be much better now...heres some pics I have of his machine
09-03-2009, 05:36 PM
#32
Rennlist Member
We need a race car version. wouldnt that be a hoot!!!???
Jeff, can we get 225Kw (1400amps, 160Volts) and then get lithiums that can support 350amp-hours? (30min race, and 50% duty cycle of full power and decel. maybe even less for some regenerative braking or decel from the motor (rear brake bias.
)
Quick calculation would be: 1400 of the 4amp-hour, 12 volt 3 cell lipo packs at 8oz a piece,or a total weight of 700lbs. (like a 928 engine.
) The batteries can handle 20C discharge, so thats 7,000amps, which is well under the limits. 1400amps would be required and that is only near 5C discharge.
so, is there a 250KW AC servo motor we can use to drive it?
There we go. a 2500lb 928 racer with 2 speeds and 300+hp that could kick axx around the track!
How cool would that be to have in the SCCA Races! ???
Jeff, can we get 225Kw (1400amps, 160Volts) and then get lithiums that can support 350amp-hours? (30min race, and 50% duty cycle of full power and decel. maybe even less for some regenerative braking or decel from the motor (rear brake bias.
)Quick calculation would be: 1400 of the 4amp-hour, 12 volt 3 cell lipo packs at 8oz a piece,or a total weight of 700lbs. (like a 928 engine.
) The batteries can handle 20C discharge, so thats 7,000amps, which is well under the limits. 1400amps would be required and that is only near 5C discharge.so, is there a 250KW AC servo motor we can use to drive it?
There we go. a 2500lb 928 racer with 2 speeds and 300+hp that could kick axx around the track!
How cool would that be to have in the SCCA Races! ???
09-03-2009, 05:37 PM
#33
Race Director
We need a race car version. wouldnt that be a hoot!!!???
Jeff, can we get 225Kw (1400amps, 160Volts) and then get lithiums that can support 350amp-hours? (30min race, and 50% duty cycle of full power and decel. maybe even less for some regenerative braking or decel from the motor (rear brake bias. )
Quick calculation would be: 1400 of the 4amp-hour, 12 volt 3 cell lipo packs at 8oz a piece,or a total weight of 700lbs. (like a 928 engine.) The batteries can handle 20C discharge, so thats 7,000amps, which is well under the limits. 1400amps would be required and that is only near 5C discharge.
so, is there a 250KW AC servo motor we can use to drive it?
There we go. a 2500lb 928 racer with 2 speeds and 300+hp that could kick axx around the track!
How cool would that be to have in the SCCA Races! ???
Jeff, can we get 225Kw (1400amps, 160Volts) and then get lithiums that can support 350amp-hours? (30min race, and 50% duty cycle of full power and decel. maybe even less for some regenerative braking or decel from the motor (rear brake bias.
)Quick calculation would be: 1400 of the 4amp-hour, 12 volt 3 cell lipo packs at 8oz a piece,or a total weight of 700lbs. (like a 928 engine.
) The batteries can handle 20C discharge, so thats 7,000amps, which is well under the limits. 1400amps would be required and that is only near 5C discharge.so, is there a 250KW AC servo motor we can use to drive it?
There we go. a 2500lb 928 racer with 2 speeds and 300+hp that could kick axx around the track!
How cool would that be to have in the SCCA Races! ???
I got an engine less roller lying around right now....thats already under 2000lbs
09-03-2009, 05:40 PM
#34
Rennlist Member
There we go. I know the motors are out there, now all we need is some robust drive electronics to handle switching 1400amps for some 3phase brushless motor. Think about the power available off turns! (flat HP curve)
or, that would equal lots of rear wheel torque when you need it. )
mk
or, that would equal lots of rear wheel torque when you need it.
)mk
09-03-2009, 10:17 PM
#35
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Mark,
Here you go ! This guy have been showing SCCA races on the East coast his rearend for years.
His setup is a lot more efficient than your requirements. Check his site out.
His setup is four wheel drive(two motors) and has a motor capable of 175hp each
http://www.proev.com/
Here you go ! This guy have been showing SCCA races on the East coast his rearend for years.
His setup is a lot more efficient than your requirements. Check his site out.
His setup is four wheel drive(two motors) and has a motor capable of 175hp each
http://www.proev.com/
There we go. I know the motors are out there, now all we need is some robust drive electronics to handle switching 1400amps for some 3phase brushless motor. Think about the power available off turns! (flat HP curve)
or, that would equal lots of rear wheel torque when you need it. )
mk
or, that would equal lots of rear wheel torque when you need it.
)mk
09-03-2009, 10:43 PM
#36
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I designed my conversion to suit over 90% Of my driving needs. If I need to go more than my pack range can take me, I take my truck or my wifes Prius.
Oh and by the way ,my new pack will take me over "110miles" at 60mph on the freeway at a 80% discharge
Jeff
Oh and by the way ,my new pack will take me over "110miles" at 60mph on the freeway at a 80% discharge
Jeff
Oh I love electric cars (though I'll gladly take a test ride). I just mean that, for most Americans, they want a car that they can drive across country if they have to. It would take forever to drive that distance only 80 miles at a time (and I would say that 80 miles is a rather optimistic range for the current generation of DIY electric cars). If one wanted to get an electric unit that *could* go across country if the need presented itself, then diesel electric is the way to go. Sorry, perhaps I should have been more clear the first time around
EDIT: It's worth pointing out that most people could survive with an electric car, since very few people frequently travel more than 100 miles from home. However, the current convenience of gasoline is, in my mind, the major competitive factor for ICEs. Electric cars are more reliable, more efficient, and electric motors produce max torque at standstill, and have a flat torque curve. They are, to my mind, the best option for powering any vehicle, their only drawback is carrying enough energy on-board to make them competitive with a gasoline car, which can be refuelled to full capacity in 3 minutes and can travel at least 300 miles between fill ups (if the car is righteously inefficient)
EDIT: It's worth pointing out that most people could survive with an electric car, since very few people frequently travel more than 100 miles from home. However, the current convenience of gasoline is, in my mind, the major competitive factor for ICEs. Electric cars are more reliable, more efficient, and electric motors produce max torque at standstill, and have a flat torque curve. They are, to my mind, the best option for powering any vehicle, their only drawback is carrying enough energy on-board to make them competitive with a gasoline car, which can be refuelled to full capacity in 3 minutes and can travel at least 300 miles between fill ups (if the car is righteously inefficient)
09-04-2009, 12:06 AM
#38
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But I would love doing over 140mph .)
09-04-2009, 12:16 AM
#39
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09-04-2009, 01:48 AM
#40
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Wow, a dream come true! 200hp at 85% of battery capacity discharge rate. Pretty cool!
Seems like this could just bury the Tesla, especially if it had a couple of gears.
Those batteries were not too far off my guess at 550lbs or so.
Then, the dream turns to a nightmare! $800 per cell? at 95 cells? thats like 70,000 BUCKS!!!! Hmmm, i think Ill stick with melting the ice caps!
mk
Seems like this could just bury the Tesla, especially if it had a couple of gears.
Those batteries were not too far off my guess at 550lbs or so.
Then, the dream turns to a nightmare! $800 per cell? at 95 cells? thats like 70,000 BUCKS!!!! Hmmm, i think Ill stick with melting the ice caps!
mk
Mark,
Here you go ! This guy have been showing SCCA races on the East coast his rearend for years.
His setup is a lot more efficient than your requirements. Check his site out.
His setup is four wheel drive(two motors) and has a motor capable of 175hp each
http://www.proev.com/
Here you go ! This guy have been showing SCCA races on the East coast his rearend for years.
His setup is a lot more efficient than your requirements. Check his site out.
His setup is four wheel drive(two motors) and has a motor capable of 175hp each
http://www.proev.com/
09-04-2009, 04:34 PM
#41
Race Director
Wow, a dream come true! 200hp at 85% of battery capacity discharge rate. Pretty cool!
Seems like this could just bury the Tesla, especially if it had a couple of gears.
Those batteries were not too far off my guess at 550lbs or so.
Then, the dream turns to a nightmare! $800 per cell? at 95 cells? thats like 70,000 BUCKS!!!! Hmmm, i think Ill stick with melting the ice caps!
mk
Seems like this could just bury the Tesla, especially if it had a couple of gears.
Those batteries were not too far off my guess at 550lbs or so.
Then, the dream turns to a nightmare! $800 per cell? at 95 cells? thats like 70,000 BUCKS!!!! Hmmm, i think Ill stick with melting the ice caps!
mk
$70k for a battery pack.....that can't be right when the replacement cost of most hybrids out there is $5-10k....I'm sure the Tesla is a bit more....but still....
A 2wd with twin motors......then you could get really fancy on putting different amounts of power to the wheels in cornering like the Acura SH system....
But I'll keep my ozone depleting 928 for a while.....
09-05-2009, 02:16 AM
#42
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$70k for a battery pack.....that can't be right when the replacement cost of most hybrids out there is $5-10k....I'm sure the Tesla is a bit more....but still....
A 2wd with twin motors......then you could get really fancy on putting different amounts of power to the wheels in cornering like the Acura SH system....
But I'll keep my ozone depleting 928 for a while.....
A 2wd with twin motors......then you could get really fancy on putting different amounts of power to the wheels in cornering like the Acura SH system....
But I'll keep my ozone depleting 928 for a while.....
Brain and you can go ahead and use all my carbon credits and have all the fun you can stand
09-05-2009, 07:19 AM
#43
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