[Bowser330]

Originally Posted by LithiumaniacsEVRacing

Both cars are sleek and aerodynamic. The 3000GT will not compete with the Zombie in th 1/4 mile, but on the highway he would be in the mirror.

Now on the other hand, the 300ZX with the two 11" motors and "new" Soliton controller has a good chance at the records. Both 11" motors will produce more torque and HP than Zombie's car. Its kind of a "toss-up" more weight (not much more) but more torque. I feel with the correct gear ratio in the rear we will take the trophy. Its all in fun, if we get it cool! If not we keep building.

I plan on building a full tube frame chassis EV dragster after these two, watch for that rocket!

If you were to tube frame or semi-tube frame the 300zx and use fiberglass or carbon fiber body panels you would probably be able to compete with the zombie in weight, add to that the dual 11" motors and you would for sure have a rocket (would need some seriously wide slicks though)...as it was mentioned, zombie wants to keep the car stock to compete in a certain class, that doesn't mean you have too...

[CroDriver]

Originally Posted by toddshotrods

Why not? CroDriver had two 11's siamesed. By rail, I'm assuming you mean dragster?

Just a suggenstion in case someone is going to do something similar -> Don't parallel the motors if you'll be pushing them to the limit. Just wire them in series.

[Bowser330]

Originally Posted by CroDriver

Just a suggenstion in case someone is going to do something similar -> Don't parallel the motors if you'll be pushing them to the limit. Just wire them in series.

Can I ask why?

Correct me if I am wrong, but Series means 1/2 pack voltage & full pack amperage right?

So using a hypothetical setup: 400V & 2000A

Its better to run each of the motors @ 200V & 2000A, rather than 400V & 1000A???

I know the torque would be greater however I thought higher voltage was better for horsepower...

[CroDriver]

Originally Posted by Bowser330

Can I ask why?

Correct me if I am wrong, but Series means 1/2 pack voltage & full pack amperage right?

So using a hypothetical setup: 400V & 2000A

Its better to run each of the motors @ 200V & 2000A, rather than 400V & 1000A???

I know the torque would be greater however I thought higher voltage was better for horsepower...

Yes, theoretically. But the problem is that there is no way to make both motors perfectly same, the wires are not the same and the connections are not the same. There will always be a different resistance from the controller to the motor. That will kill one motor if you're close to the limit of both motors. That happened to me. I fried one motor while the other one was like new.

I shipped the motor back to the manufacturer to wind them to 150V each - so I can have full RPMs even when they are wired in series.

[EVfun]

Originally Posted by LithiumaniacsEVRacing

Both 11" motors will produce more torque and HP than Zombie's car.

This is a common misconception. The motors only convert power from watts to shaft horsepower. The power available will be determined by the watts (volts times amps) you feed the motor. If the chosen motor(s) are seriously undersized the efficiency will tank at high power levels and they will burn up. If the motors are not getting too hot on the drag strip there is not going to be a big difference.

Making more torque at a given power level simply means you do so at a lower rpm. HP = torque * rpm / 5252. Gearing can accomplish this too.

[Bowser330]

Originally Posted by CroDriver

Yes, theoretically. But the problem is that there is no way to make both motors perfectly same, the wires are not the same and the connections are not the same. There will always be a different resistance from the controller to the motor. That will kill one motor if you're close to the limit of both motors. That happened to me. I fried one motor while the other one was like new.

I shipped the motor back to the manufacturer to wind them to 150V each - so I can have full RPMs even when they are wired in series.

please tell us more about this rewinding and the performance when you get them back. Thanks!

[Bowser330]

Originally Posted by EVfun

This is a common misconception. The motors only convert power from watts to shaft horsepower. The power available will be determined by the watts (volts times amps) you feed the motor. If the chosen motor(s) are seriously undersized the efficiency will tank at high power levels and they will burn up. If the motors are not getting too hot on the drag strip there is not going to be a big difference.

Making more torque at a given power level simply means you do so at a lower rpm. HP = torque * rpm / 5252. Gearing can accomplish this too.

I think all he is saying is that two 11" motors is a more powerful setup than two 9" motors...Seeing what Crodriver has documented with the built 11" doing 500whp, 1000whp with two 11" motors is more powerful than the current setup on the White Zombie. That is true...however...Will he be able to put that power to the ground? Will the battery pack be able to give that much energy reliably? The entire setup has to work together to be successful.

[CroDriver]

Originally Posted by Bowser330

I think all he is saying is that two 11" motors is a more powerful setup than two 9" motors...Seeing what Crodriver has documented with the built 11" doing 500whp, 1000whp with two 11" motors is more powerful than the current setup on the White Zombie. That is true...however...Will he be able to put that power to the ground? Will the battery pack be able to give that much energy reliably? The entire setup has to work together to be successful.

Yap... The batteries will be an issue too. My guess is that you will need at least 600 kg of batteries of 1000 whp.

[Jozzer]

600kg? Thats 83kw/h of lipo! The cells we curently use that would give 1600kw continuous, I'm sure you could do better. THere are 35-40C lipo's out there at affordable prices these days, you could make 1000kw+ with a 30KW/h pack of these, weighing just 215kg.
Thought you were making a drag car here

Steve

Originally Posted by CroDriver

Yap... The batteries will be an issue too. My guess is that you will need at least 600 kg of batteries of 1000 whp.

[Bowser330]

Originally Posted by Jozzer

600kg? Thats 83kw/h of lipo! The cells we curently use that would give 1600kw continuous, I'm sure you could do better. THere are 35-40C lipo's out there at affordable prices these days, you could make 1000kw+ with a 30KW/h pack of these, weighing just 215kg.
Thought you were making a drag car here

Steve

Please provide links to these cells!

I am wondering:
What is the safe charge Amps for these cells?
What is the stability? Fire Danger?
What is the cycle life? Does it compare to Lithium phosphate?